MAX9750AETI-T [MAXIM]
Volume Control Circuit, BICMOS, 5 X 5 MM, 0.80 MM HEIGHT, TQFN-28;
| 型号： | MAX9750AETI-T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Volume Control Circuit, BICMOS, 5 X 5 MM, 0.80 MM HEIGHT, TQFN-28 放大器 功率放大器 |
| 文件： | 总31页 (文件大小：674K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-3006; Rev 0; 1/04
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
General Description
Features
The MAX9750/MAX9751/MAX9755 combine a stereo,
2.6W audio power amplifier and stereo DirectDrive
110mW headphone amplifier in a single device. The
headphone amplifier uses Maxim’s patented DirectDrive
architecture that produces a ground-referenced output
from a single supply, eliminating the need for large DC-
blocking capacitors, saving cost, space, and component
height. A high 90dB PSRR and low 0.01% THD+N
ensures clean, low-distortion amplification of the audio
signal.
♦ No DC-Blocking Capacitors Required—Provides
Industry’s Most Compact Notebook Audio
Solution
♦ PC2001 Compliant
♦ 5V Single-Supply Operation
♦ Class AB 2.6W Stereo BTL Speaker Amplifiers
♦ 110mW DirectDrive Headphone Amplifiers
♦ High 90dB PSRR
The MAX9750 features an analog volume control, and a
BEEP input. The MAX9751 features a 2:1 input multiplexer,
allowing multiple audio sources to be selected. All devices
feature a single-supply voltage, a shutdown mode, logic-
selectable gain, and a headphone sense input. Industry-
leading click-and-pop suppression eliminates audible
transients during power and shutdown cycles.
♦ Low-Power Shutdown Mode
♦ Industry-Leading Click-and-Pop Suppression
♦ Low 0.01% THD+N at 1kHz
♦ Short-Circuit and Thermal Protection
♦ Selectable Gain Settings
The MAX9750/MAX9751/MAX9755 are offered in space-
saving, thermally efficient 28-pin thin QFN (5mm x 5mm
x 0.8mm) and 28-pin TSSOP-EP packages. Both devices
have thermal-overload and output short-circuit protec-
tion, and are specified over the extended -40°C to +85°C
temperature range.
♦ Analog Volume Control (MAX9750)
♦ Beep Input with Glitch Filter (MAX9750)
♦ 2:1 Stereo Input MUX (MAX9751)
♦ ±±kV ꢀSD-Protected Headphone Driver Outputs
Applications
♦ Available in Space-Saving, Thermally ꢀfficient
Packages
Notebook PCs
Tablet PCs
Flat-Panel TVs
PC Displays
2±-Pin Thin QFN (5mm x 5mm x 0.±mm)
2±-Pin TSSOP-ꢀP
Portable DVD
LCD Projectors
Ordering Information
Simplified Block Diagrams
PIN-
PACKAGꢀ
MAXIMUM
GAIN (dB)
PART
TꢀMP RANGꢀ
MAX9750AETI*† -40°C to +85°C 28 Thin QFN
MAX9750AEUI*† -40°C to +85°C 28 TSSOP-EP**
MAX9750BETI*† -40°C to +85°C 28 Thin QFN
MAX9750BEUI*† -40°C to +85°C 28 TSSOP-EP**
MAX9750CETI† -40°C to +85°C 28 Thin QFN
MAX9750CEUI*† -40°C to +85°C 28 TSSOP-EP**
13.5
13.5
19.5
19.5
10.5
10.5
10.5
10.5
10.5
10.5
MAX9751ETI*†
-40°C to +85°C 28 Thin QFN
MAX9751EUI*†
-40°C to +85°C 28 TSSOP-EP**
VOL
MAX9755AETI*† -40°C to +85°C 28 Thin QFN
MAX9755AEUI*† -40°C to +85°C 28 TSSOP-EP**
BEEP
*Future product—contact factory for availability.
**EP = Exposed Paddle.
†Lead-free package.
MAX9750
Simplifed Block Diagrams continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
ABSOLUTꢀ MAXIMUM RATINGS
Supply Voltage (V , PV , HPV , CPV
to GND)..........+6V
Continuous Current (CPV , C1N, C1P, CPV , V , HPV
,
DD
DD
DD
DD
DD
SS SS
DD
GND to PGND..................................................................... 0.3V
CPV , C1N, V to GND .........................-6.0V to (GND + 0.3V)
HPOUT_ to GND.................................................................... 3V
HPOUT_).......................................................................850mA
Continuous Input Current (All Other Pins) ........................ 20mA
Continuous Power Dissipation (T = +70°C)
A
SS
SS
Any Other Pin .............................................-0.3V to (V + 0.3V)
28-Pin Thin QFN (derate 20.8mW/°C above +70°C) ..1667mW
28-Pin TSSOP-EP (derate 23.8mW/°C above +70°C).1904mW
Junction Temperature......................................................+150°C
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
DD
Duration of OUT_ Short Circuit to GND or PV ........Continuous
DD
Duration of OUT_+ Short Circuit to OUT_-.................Continuous
Duration of HPOUT_ Short Circuit to GND,
V
or HPV .........................................................Continuous
SS
DD
Continuous Current (PV , OUT_, PGND) ...........................1.7A
DD
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ꢀLꢀCTRICAL CHARACTꢀRISTICS
(V
= PV
= CPV
= HPV
= 5V, GND = PGND = CPGND = 0V, SHDN = V , C
= 1µF, C1 = C2 = 1µF, speaker load ter-
BIAS
DD
DD
DD
DD
DD
minated between OUT_+ and OUT_-, headphone load terminated between HPOUT_ and GND, MAX9750: GAIN1 = GAIN2 = VOL =
= IN1/2 = GND, T = T to T , unless otherwise noted. Typical values are
R = 33kΩ = GND, MAX9751/MAX9755: GAIN = V
L
DD
A
MIN
MAX
at T = +25°C.) (Note 1)
A
PARAMꢀTꢀR
GꢀNꢀRAL
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage Range
V
, PV
Inferred from PSRR test
Inferred from PSRR test
4.5
3
5.5
5.5
V
V
DD
DD
CPV
,
DD
Headphone Supply Voltage
Quiescent Supply Current
HPV
DD
HPS = GND, speaker mode, R = ∞
14
7
29
13
5
L
I
mA
DD
HPS = V , headphone mode, R = ∞
DD
L
Shutdown Supply Current
Bias Voltage
I
SHDN = GND
0.2
1.8
10
20
25
µA
V
SHDN
V
1.7
10
1.9
BIAS
Switching Time
t
Gain or input switching
Amplifier inputs (Note 2)
µs
kΩ
ms
SW
Input Resistance
Turn-On Time
R
30
6
IN
t
SON
SPꢀAKꢀR AMPLIFIꢀR (HPS = GND)
Output Offset Voltage
V
Measured between OUT_+ - OUT_-
PV or V = 4.5V to 5.5V (T = +25°C)
0.4
mV
dB
OS
75
90
80
55
DD
DD
A
Power-Supply Rejection Ratio
(Note 3)
PSRR
f = 1kHz, V = 200mV
RIPPLE P-P
f = 10kHz, V
= 200mV
P-P
RIPPLE
2
_______________________________________________________________________________________
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
ꢀLꢀCTRICAL CHARACTꢀRISTICS (continued)
(V
= PV
= CPV
= HPV
= 5V, GND = PGND = CPGND = 0V, SHDN = V , C
= 1µF, C1 = C2 = 1µF, speaker load ter-
BIAS
DD
DD
DD
DD
DD
minated between OUT_+ and OUT_-, headphone load terminated between HPOUT_ and GND, MAX9750: GAIN1 = GAIN2 = VOL =
R = 33kΩ = GND, MAX9751/MAX9755: GAIN = V
= IN1/2 = GND, T = T
to T
, unless otherwise noted. Typical values are
L
DD
A
MIN
MAX
at T = +25°C.) (Note 1)
A
PARAMꢀTꢀR
SYMBOL
CONDITIONS
MIN
0.65
1.2
TYP
1.4
0.8
2.3
1.5
MAX
UNITS
MAX9750A/
MAX9750B/
MAX9751/
MAX9755
R = 8Ω
L
MAX9750C
MAX9750A/
MAX9750B/
MAX9751/
MAX9755
THD+N = 1%,
Output Power
P
f = 1kHz, T
=
R = 4Ω
L
W
OUT
A
+25°C
MAX9750C
MAX9750A/
MAX9750B/
MAX9751/
MAX9755
2.6
R = 3Ω
L
MAX9750C
2.2
0.01
0.02
90
R = 8Ω, P
= 500mW, f = 1kHz
= 1W, f = 1kHz
L
OUT
OUT
OUT
Total Harmonic Distortion Plus
Noise
THD+N
SNR
%
R = 4Ω, P
L
Signal-to-Noise Ratio
Noise
R = 8Ω, P
L
= 1W, BW = 22Hz to 22kHz
dB
V
BW = 22Hz to 22kHz, A-weighted
No sustained oscillations
80
µV
RMS
n
Capacitive-Load Drive
C
200
75
pF
L
L to R, R to L, f = 10kHz
Crosstalk
Slew Rate
dB
Any unselected input to any active input,
f = 10kHz (MAX9751)
60
SR
1.4
9
V/µs
GAIN1 = 0, GAIN2 = 0
GAIN1 = 1, GAIN2 = 0
10.5
12
MAX9750A
GAIN1 = 0, GAIN2 = 1
GAIN1 = 1, GAIN2 = 1
GAIN1 = 0, GAIN2 = 0
GAIN1 = 1, GAIN2 = 0
13.5
15
16.5
18
MAX9750B
Gain (Maximum Volume Setting)
A
dB
VMAX(SPKR)
GAIN1 = 0, GAIN2 = 1
GAIN1 = 1, GAIN2 = 1
GAIN1 = 0, GAIN2 = 0
19.5
6
GAIN1 = 1, GAIN2 = 0
MAX9750C
7.5
GAIN1 = 0, GAIN2 = 1
9
GAIN1 = 1, GAIN2 = 1
10.5
9
GAIN = 1
GAIN = 0
Gain (MAX9751/MAX9755)
A
dB
V
10.5
_______________________________________________________________________________________
3
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
ꢀLꢀCTRICAL CHARACTꢀRISTICS (continued)
(V
= PV
= CPV
= HPV
= 5V, GND = PGND = CPGND = 0V, SHDN = V , C
= 1µF, C1 = C2 = 1µF, speaker load ter-
BIAS
DD
DD
DD
DD
DD
minated between OUT_+ and OUT_-, headphone load terminated between HPOUT_ and GND, MAX9750: GAIN1 = GAIN2 = VOL =
= IN1/2 = GND, T = T to T , unless otherwise noted. Typical values are
R = 33kΩ = GND, MAX9751/MAX9755: GAIN = V
L
DD
A
MIN
MAX
at T = +25°C.) (Note 1)
A
PARAMꢀTꢀR
SYMBOL
CONDITIONS
MIN
70
TYP
MAX
UNITS
mV
HꢀADPHONꢀ AMPLIFIꢀR (HPS = V
Output Offset Voltage
)
DD
V
T
= +25°C
2
75
73
63
50
7
OS
A
HPV
= 3V to 5.5V, T = +25°C
A
DD
Power-Supply Rejection Ratio
(Note 3)
PSRR
dB
f = 1kHz, V
= 200mV
P-P
RIPPLE
f = 10kHz, V
= 200mV
P-P
RIPPLE
THD+N = 1%,
f = 1kHz,
R = 32Ω
L
40
Output Power
P
mW
OUT
R = 16Ω
L
110
T
A
= +25°C
R = 32Ω, P
= 20mW, f = 1kHz
= 75mW, f = 1kHz
= 50mW,
0.007
0.03
L
OUT
Total Harmonic Distortion Plus
Noise
THD+N
SNR
%
R = 16Ω, P
L
OUT
R = 32Ω, P
L
OUT
Signal-to-Noise Ratio
95
dB
BW = 22Hz to 22kHz
Noise
V
BW = 22Hz to 22kHz
12
200
88
µV
RMS
n
Capacitive-Load Drive
C
No sustained oscillations
L to R, R to L, f = 10kHz
pF
L
Crosstalk
dB
Any unselected input to any active input,
f = 10kHz (MAX9751)
88
Slew Rate
ESD
SR
0.4
8
V/µs
kV
ESD
IEC air discharge
GAIN2 = GAIN = 1, GAIN1 = X
GAIN2 = GAIN = 0, GAIN1 = X
0
Gain
A
dB
V
3
CHARGꢀ PUMP
Charge-Pump Frequency
VOLUMꢀ CONTROL (MAX9750_)
VOL Input Impedance
VOL Input Hysteresis
f
500
550
600
kHz
OSC
R
100
10
MΩ
VOL
mV
0.858 x
Full Mute Input Voltage
(Note 4)
V
HPV
DD
Channel Matching
A = -25dB to +13.5dB
V
0.2
dB
BꢀꢀP INPUT (MAX9750_)
Beep Signal Minimum Amplitude
Beep Signal Minimum Frequency
V
0.8
V
P-P
BEEP
f
200
Hz
BEEP
4
_______________________________________________________________________________________
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
ꢀLꢀCTRICAL CHARACTꢀRISTICS (continued)
(V
= PV
= CPV
= HPV
= 5V, GND = PGND = CPGND = 0V, SHDN = V , C
= 1µF, C1 = C2 = 1µF, speaker load ter-
BIAS
DD
DD
DD
DD
DD
minated between OUT_+ and OUT_-, headphone load terminated between HPOUT_ and GND, MAX9750: GAIN1 = GAIN2 = VOL =
= IN1/2 = GND, T = T to T , unless otherwise noted. Typical values are
R = 33kΩ = GND, MAX9751/MAX9755: GAIN = V
L
DD
A
MIN
MAX
at T = +25°C.) (Note 1)
A
PARAMꢀTꢀR
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
LOGIC INPUT (SHDN, GAIN1, GAIN2, GAIN, VOL, IN1/2, HPS)
Logic Input High Voltage
Logic Input Low Voltage
Logic Input Current
V
2
V
V
IH
V
0.8
1
IL
I
µA
IN
Note 1: All devices are 100% production tested at room temperature. All temperature limits are guaranteed by design.
Note 2: Guaranteed by design. Not production tested.
Note 3: PSRR is specified with the amplifier input connected to GND through C
Note 4: See Table 3 for details of the mute levels.
.
IN
Note 5: The value of R dictates the minimum beep signal amplitude (see the Beep Input section).
B
_______________________________________________________________________________________
5
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
Typical Operating Characteristics
(Measurement BW = 22Hz to 22kHz, T = +25°C, unless otherwise noted.)
A
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (SPEAKER MODE)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (SPEAKER MODE)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (SPEAKER MODE)
10
1
10
1
10
1
V
= 5V
V
= 5V
V
= 5V
CC
CC
CC
R = 3Ω
R = 4Ω
R = 8Ω
L
L
L
A
V
= 10.5dB
A
= 10.5dB
A = 10.5dB
V
V
OUTPUT POWER = 1.5W
OUTPUT POWER = 1.25W
OUTPUT POWER = 100mW
0.1
0.01
0.1
0.01
0.1
0.01
OUTPUT POWER = 500mW
OUTPUT POWER = 500mW
OUTPUT POWER = 600mW
0.001
0.001
0.001
0.0001
0.0001
0.0001
10
100
1k
10k
100k
10
100
1k
10k
100k
10
100
1k
10k
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SPEAKER MODE)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SPEAKER MODE)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SPEAKER MODE)
100
10
1
100
10
1
100
10
1
V
= 5V
V
= 5V
CC
L
V
CC
L
V
V
= 5V
CC
L
V
R = 8Ω
A
MAX9750C
R = 4Ω
A
MAX9750C
R = 3Ω
A
MAX9750C
= 10.5dB
= 10.5dB
= 10.5dB
f
= 10kHz
f
= 10kHz
IN
IN
f
= 10kHz
0.1
0.1
0.1
IN
0.01
0.01
0.01
f
= 1kHz
2.0
f
= 1kHz
IN
IN
f
= 20Hz
f
= 1kHz
0.8
f
= 20Hz
IN
IN
IN
f
= 20Hz
IN
0.001
0.001
0.001
0
0.5
1.0
1.5
2.5
3.0
0
2.0
0
1.2
0.5
1.0
OUTPUT POWER (W)
1.5
0.2
0.4
0.6
1.0
OUTPUT POWER (W)
OUTPUT POWER (W)
POWER DISSIPATION vs. OUTPUT POWER
(SPEAKER MODE)
OUTPUT POWER
vs. LOAD RESISTANCE (SPEAKER MODE)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (SPEAKER MODE)
5
4
3
2
1
0
3.0
2.5
2.0
1.5
1.0
0.5
0
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
V
A
= 200mV
P-P
= 10.5dB
V
= 5V
RIPPLE
V
V
= 5V
DD
CC
f = 1kHz
= P
f = 1kHz
= 10.5dB
OUTPUT REFERRED
P
+ P
OUTR
A
OUT
OUTL
V
MAX9750C
MAX9750C
R = 4Ω
L
THD+N = 10%
THD+N = 1%
R = 8Ω
L
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
OUTPUT POWER (W)
1
10
LOAD RESISTANCE (Ω)
100
10
100
1k
FREQUENCY (Hz)
10k
100k
6
_______________________________________________________________________________________
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
Typical Operating Characteristics (continued)
(Measurement BW = 22Hz to 22kHz, T = +25°C, unless otherwise noted.)
A
TURN-ON RESPONSE
(SPEAKER MODE)
CROSSTALK vs. FREQUENCY
(SPEAKER MODE)
MAX9750/51 toc11
0
V
V
= 5V
CC
-10
-20
-30
-40
-50
-60
-70
-80
5V/div
= 200mV
RIPPLE
P-P
R = 4Ω
L
SHDN
OUT_+
AND
2V/div
OUT_-
LEFT TO RIGHT
RIGHT TO LEFT
OUT_+
100mV/div
-90
-100
-110
-120
- OUT_-
R
= 8Ω
L
10
100
1k
10k
100k
20ms/div
FREQUENCY (Hz)
TURN-OFF RESPONSE
(SPEAKER MODE)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9750/51 toc12
10
1
10
1
V = 5V
DD
V
= 5V
DD
L
V
R = 32Ω
R = 16Ω
A
L
5V/div
2V/div
A = 3dB
V
= 3dB
SHDN
OUTPUT POWER = 45mW
OUTPUT POWER = 90mW
OUT_+
AND
OUT_-
0.1
0.01
0.1
0.01
0.001
OUTPUT POWER = 10mW
OUTPUT POWER = 30mW
OUT_+
- OUT_-
20mV/div
0.001
R
= 8Ω
L
0.0001
0.0001
10
100
1k
10k
100k
10
100
1k
10k
100k
20ms/div
FREQUENCY (Hz)
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
10
10
1
V
= 3.3V
V
= 3.3V
DD
DD
R = 32Ω
V
R = 16Ω
V
L
L
A
= 3dB
A
= 3dB
1
0.1
OUTPUT POWER = 30mW
OUTPUT POWER = 45mW
0.1
0.01
0.01
OUTPUT POWER = 10mW
OUTPUT POWER = 10mW
0.001
0.001
0.0001
0.0001
10
100
1k
10k
100k
10
100
1k
10k
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
_______________________________________________________________________________________
7
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
Typical Operating Characteristics (continued)
(Measurement BW = 22Hz to 22kHz, T = +25°C, unless otherwise noted.)
A
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
1000
100
10
1000
100
10
1000
100
10
V
= 5V
V
= 5V
DD
V
= 3.3V
DD
DD
R = 16Ω
R = 32Ω
R = 16Ω
L
L
L
A
= 3dB
A = 3dB
V
A
= 3dB
V
V
f
IN
= 1kHz
f
IN
= 1kHz
1
1
1
f
IN
= 10kHz
f
IN
= 10kHz
f
IN
= 10kHz
0.1
0.1
0.1
f
IN
= 20Hz
0.01
0.001
0.01
0.001
0.01
0.001
f
= 1kHz
100
IN
f
IN
= 20Hz
20
0
25
50
75
125
150
0
40
60
80
100
10
40
OUTPUT POWER (mW)
0
20
30
50
60
OUTPUT POWER (mW)
OUTPUT POWER (mW)
OUTPUT POWER vs. LOAD RESISTANCE
(HEADPHONE MODE)
POWER DISSIPATION vs. OUTPUT POWER
(HEADPHONE MODE)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
180
160
140
120
100
80
250
225
200
175
150
125
100
75
1000
100
10
V
= 3.3V
DD
L
V
R = 32Ω
A
THD+N = 10%
R = 16
L
Ω
= 3dB
f
= 1kHz
IN
1
f
IN
= 10kHz
R = 32
L
Ω
60
0.1
40
V
= 5V
50
DD
THD+N = 1%
0.01
0.001
f = 1kHz
= P
20
25
P
+ P
OUTR
OUT
OUTL
0
0
10
100
1000
0
25 50 75 100 125 150 175 200 225 250
OUTPUT POWER (mW)
40 50
OUTPUT POWER (mW)
90
0
10 20 30
60 70 80
LOAD RESISTANCE (Ω)
OUTPUT POWER vs. SUPPLY VOLTAGE
(HEADPHONE MODE)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (HEADPHONE MODE)
125
100
75
50
25
0
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
V
A
= 200mV
P-P
= 10.5dB
RIPPLE
V
R = 16Ω
L
OUTPUT REFERRED
R = 32Ω
L
f = 1kHz
3.0
3.5
4.0
4.5
5.0
5.5
10
100
1k
FREQUENCY (Hz)
10k
100k
SUPPLY VOLTAGE (V)
±
_______________________________________________________________________________________
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
Typical Operating Characteristics (continued)
(Measurement BW = 22Hz to 22kHz, T = +25°C, unless otherwise noted.)
A
CROSSTALK vs. FREQUENCY
(HEADPHONE MODE)
OUTPUT POWER vs. CHARGE-PUMP
CAPACITANCE AND LOAD RESISTANCE
HEADPHONE OUTPUT SPECTRUM
0
-20
0
-20
200
180
160
140
120
100
80
V = 5V
DD
V
V
= 5V
V
= 5V
CC
DD
f = 1kHz
= -60dB
= 200mV
f = 1kHz
THD+N = 1%
RIPPLE
P-P
V
R = 32Ω
OUT
L
R = 32Ω
L
-40
-40
-60
C1 = C2 = 2.2µF
-60
-80
-80
60
-100
-120
-140
RIGHT TO LEFT
C1 = C2 = 1µF
40
-100
-120
20
LEFT TO RIGHT
0
0
5
10
15
20
10
100
1k
10k
100k
10
20
30
40
50
FREQUENCY (Hz)
FREQUENCY (Hz)
LOAD RESISTANCE (Ω)
TURN-OFF RESPONSE
(HEADPHONE MODE)
TURN-ON RESPONSE
(HEADPHONE MODE)
MAX9750/51 toc29
MAX9750/51 toc28
5V/div
5V/div
SHDN
SHDN
20mV/div
20mV/div
HPOUT_
HPOUT_
R
= 32Ω
R
= 32Ω
L
L
10ms/div
10ms/div
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
18
0.35
16
14
12
10
HPS = GND
0.30
0.25
0.20
0.15
0.10
0.05
0
HPS = V
DD
8
6
4
2
0
4.50
4.75
5.00
5.25
5.50
4.50
4.75
5.00
5.25
5.50
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
9
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
Pin Description
PIN
NAMꢀ
FUNCTION
MAX9750
MAX9751
MAX9755
THIN
QFN
THIN
QFN
THIN
QFN
TSSOP
TSSOP
TSSOP
1
5
6
—
—
—
2
6
—
INL
Left-Channel Audio Input
2
—
—
BEEP
Audible Alert Beep Input
3, 19
4
7, 23
8
3, 19
4
7, 23
8
3, 19
4
7, 23
8
PGND
OUTL+
OUTL-
Power Ground
Left-Channel Positive Speaker Output
Left-Channel Negative Speaker Output
Speaker Amplifier Power Supply
Charge-Pump Power Supply
5
9
5
9
5
9
6, 16
7
10, 20
11
12
13
14
15
16
17
18
19
21
22
24
6, 16
7
10, 20
11
6, 16
7
10, 20
11
PV
DD
CPV
DD
8
8
12
8
12
C1P
Charge-Pump Flying-Capacitor Positive Terminal
9
9
13
9
13
CPGND Charge-Pump Ground
C1N Charge-Pump Flying-Capacitor Negative Terminal
CPV Charge-Pump Output. Connect to V
10
11
12
13
14
15
17
18
20
10
11
12
13
14
15
17
18
20
14
10
11
12
13
14
15
17
18
20
14
15
15
.
SS
SS
16
16
V
Headphone Amplifier Negative Power Supply
SS
17
17
HPOUTR Right-Channel Headphone Output
HPOUTL Left-Channel Headphone Output
18
18
19
19
HPV
Headphone Positive Power Supply
Right-Channel Negative Speaker Output
Right-Channel Positive Speaker Output
Headphone Sense Input
DD
21
21
OUTR-
OUTR+
HPS
22
22
24
24
Common-Mode Bias Voltage. Bypass with a 1µF
capacitor to GND.
21
22
25
26
21
22
25
26
21
22
25
26
BIAS
Shutdown. Drive SHDN low to disable the device.
SHDN
Connect SHDN to V
for normal operation.
DD
23
24
25
26
27
28
—
—
—
—
—
—
—
27
28
1
—
—
25
26
—
—
1
—
—
1
—
—
—
—
GAIN2
GAIN1
Gain Control Input 2
Gain Control Input 1
Power Supply
25
1
V
DD
2
2
23, 26
28
2, 27
4
GND
INR
Ground
3
—
—
5
Right-Channel Audio Input
Analog Volume Control Input
Left-Channel Audio Input 1
Left-Channel Audio Input 2
Input Select
4
—
—
VOL
—
—
—
—
—
—
—
—
—
INL1
INL2
IN1/2
GAIN
INR1
INR2
N.C.
2
6
—
—
23
24
27
28
—
27
28
3
—
—
24
28
—
Gain Select
—
Right-Channel Audio Input 1
Right-Channel Audio Input 2
No Connection. Not internally connected.
4
—
—
—
1, 27
3, 5
10 ______________________________________________________________________________________
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
MAX9750 ONLY
V
DD
IN_
V
OUT
V
/2
DD
GND
OUT_+
BIAS
BIAS
CONVENTIONAL DRIVER-BIASING SCHEME
+V
DD
VOLUME
CONTROL
OUT_
VOL
BIAS
GND
GND
HPOUT_
-V
DD
DirectDrive BIASING SCHEME
Figure 2. Traditional Headphone Amplifier Output Waveform
vs. DirectDrive Headphone Amplifier Output Waveform
Figure 1. MAX9750/MAX9751 Signal Path
The amplifiers have almost twice the supply range
compared to other single-supply amplifiers, nearly qua-
drupling the available output power. The benefit of the
GND bias is that the amplifier outputs no longer have a
Detailed Description
The MAX9750/MAX9751/MAX9755 combine a 2.6W BTL
speaker amplifier and a 110mW DirectDrive headphone
amplifier with integrated headphone sensing and com-
prehensive click-and-pop suppression. The MAX9750
features an analog volume control, BEEP input, and
four-level gain control. The MAX9751 features a 2:1
input stereo multiplexer and two-level gain control. All
devices feature high 90dB PSRR, low 0.01% THD+N,
industry-leading click-pop performance, and a low-
power shutdown mode.
DC component (typically V
/ 2). This eliminates the
DD
large DC-blocking capacitors required with convention-
al headphone amplifiers, conserving board space and
system cost, and improving frequency response.
The MAX9750 features an analog volume control that
varies the gain of the amplifiers based on the DC volt-
age applied at VOL. Both devices feature an undervolt-
age lockout that prevents operation from an insufficient
power supply and click-and-pop suppression that elim-
inates audible transients on startup and shutdown. The
amplifiers include thermal-overload and short-circuit
protection, and can withstand 8kV ESD strikes on the
headphone amplifier outputs (IEC air discharge). An
additional feature of the speaker amplifiers is that there
is no phase inversion from input to output.
Each signal path consists of an input amplifier that sets
the gain of the signal path and feeds both the speaker
and headphone amplifier (Figure 1). The speaker
amplifier uses a BTL architecture, doubling the voltage
drive to the speakers and eliminating the need for DC-
blocking capacitors. The output consists of two signals,
identical in magnitude, but 180° out of phase.
The headphone amplifiers use Maxim’s patented
DirectDrive architecture that eliminates the bulky output
DC-blocking capacitors required by traditional head-
phone amplifiers. A charge pump inverts the positive
DirectDrive
Conventional single-supply headphone amplifiers have
their outputs biased about a nominal DC voltage (typi-
cally half the supply) for maximum dynamic range.
Large coupling capacitors are needed to block this DC
bias from the headphones. Without these capacitors, a
supply (CPV ), creating a negative supply (CPV ).
DD
SS
The headphone amplifiers operate from these bipolar
supplies with their outputs biased about GND (Figure 2).
______________________________________________________________________________________ 11
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
significant amount of DC current flows to the headphone,
LOW-FREQUENCY ROLLOFF
resulting in unnecessary power dissipation and possible
(R = 16Ω)
L
damage to both headphone and headphone amplifier.
0
Maxim’s patented DirectDrive architecture uses a charge
pump to create an internal negative supply voltage. This
allows the MAX9750/MAX9751/MAX9755 headphone
amplifier output to be biased about GND, almost dou-
bling the dynamic range while operating from a single
supply. With no DC component, there is no need for the
large DC-blocking capacitors. Instead of two large
capacitors (220µF typ), the MAX9750/MAX9751/
MAX9755 charge pump requires only two small ceramic
capacitors (1µF typ), conserving board space, reducing
cost, and improving the frequency response of the head-
phone amplifier. See the Output Power vs. Charge-Pump
Capacitance and Load Resistance graph in the Typical
Operating Characteristics for details of the possible
capacitor values.
-3
DirectDrive
330µF
220µF
100µF
-6
-9
-12
-15
-18
33µF
-21
-24
-27
-30
10
100
1k
FREQUENCY (Hz)
10k
100k
Figure 3. Low-Frequency Attenuation of Common DC-Blocking
Capacitor Values
Previous attempts to eliminate the output coupling
capacitors involved biasing the headphone return
(sleeve) to the DC bias voltage of the headphone
amplifiers. This method raised some issues:
the filter can attenuate low-frequency signals within
the audio band. Larger values of C
reduce the
OUT
attenuation but are physically larger, more expen-
sive capacitors. Figure 3 shows the relationship
1) The sleeve is typically grounded to the chassis. Using
this biasing approach, the sleeve must be isolated
from system ground, complicating product design.
between the size of C
and the resulting low-fre-
OUT
quency attenuation. Note that the -3dB point for a
16Ω headphone with a 100µF blocking capacitor is
100Hz, well within the audio band.
2) During an ESD strike, the amplifier’s ESD structures
are the only path to system ground. The amplifier
must be able to withstand the full ESD strike.
2) The voltage coefficient of the capacitor, the change
in capacitance due to a change in the voltage
across the capacitor, distorts the audio signal. At
frequencies around the -3dB point, the reactance of
the capacitor dominates, and the voltage coefficient
appears as frequency-dependent distortion. Figure
4 shows the THD+N introduced by two different
capacitor dielectrics. Note that around the -3dB
point, THD+N increases dramatically.
3) When using the headphone jack as a lineout to other
equipment, the bias voltage on the sleeve may con-
flict with the ground potential from other equipment,
resulting in large ground-loop current and possible
damage to the amplifiers.
Low-Frequency Response
In addition to the cost and size disadvantages, the DC-
blocking capacitors limit the low-frequency response of
the amplifier and distort the audio signal:
The combination of low-frequency attenuation and fre-
quency-dependent distortion compromises audio
reproduction. DirectDrive improves low-frequency
reproduction in portable audio equipment that empha-
sizes low-frequency effects such as multimedia lap-
tops, and MP3, CD, and DVD players.
1) The impedance of the headphone load to the DC-
blocking capacitor forms a highpass filter with the
-3dB point determined by:
1
f
=
−3dB
2πR C
L
OUT
Charge Pump
The MAX9750/MAX9751/MAX9755 feature a low-noise
charge pump. The 550kHz switching frequency is well
beyond the audio range, and does not interfere with the
audio signals. The switch drivers feature a controlled
switching speed that minimizes noise generated by turn-
on and turn-off transients. Limiting the switching speed of
the charge pump minimizes the di/dt noise caused by the
where R is the impedance of the headphone and
L
C
OUT
is the value of the DC-blocking capacitor.
The highpass filter is required by conventional sin-
gle-ended, single-supply headphone amplifiers to
block the midrail DC component of the audio signal
from the headphones. Depending on the -3dB point,
12 ______________________________________________________________________________________
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
ADDITIONAL THD+N DUE
V
DD
TO DC-BLOCKING CAPACITORS
MAX9750/
MAX9751/
MAX9755
10
1
10µA
SHUTDOWN
CONTROL
20
14
0.1
HPS
HPOUTL
TANTALUM
0.01
0.001
0.0001
13
HPOUTR
1kΩ
1kΩ
ALUM/ELEC
10
100
1k
10k
100k
FREQUENCY (Hz)
Figure 4. Distortion Contributed by DC-Blocking Capacitors
Figure 5. HPS Configuration
parasitic bond wire and trace inductance. Although not
typically required, additional high-frequency ripple atten-
uation can be achieved by increasing the size of C2 (see
the Typical Application Circuit).
Gain Selection
MAX9750
The MAX9750 features an internally set, selectable gain.
The GAIN1 and GAIN2 inputs set the maximum gain of
the MAX9750 speaker and headphone amplifiers (Table
1). The gain of the device can vary based upon the volt-
age at VOL (see the Analog Volume Control section).
However, the maximum gain cannot be exceeded.
Headphone Sense Input (HPS)
The headphone sense input (HPS) monitors the head-
phone jack and automatically configures the device
based upon the voltage applied at HPS. A voltage of
less than 0.8V sets the device to speaker mode. A volt-
age of greater than 2V disables the bridge amplifiers
and enables the headphone amplifiers.
MAX9751/MAX9755
The gain of the MAX9751/MAX9755 is set by the GAIN
input. Driving GAIN high sets the gain of the speaker
amplifiers to 9dB and the gain of the headphone ampli-
fiers to 0dB. Driving GAIN low sets the gain of the
speaker amplifiers to 10.5dB, and the gain of the head-
phone amplifiers to 3dB (Table 2).
For automatic headphone detection, connect HPS to the
control pin of a 3-wire headphone jack as shown in
Figure 5. With no headphone present, the output imped-
ance of the headphone amplifier pulls HPS low. When a
headphone plug is inserted into the jack, the control pin
is disconnected from the tip contact and HPS is pulled
Analog Volume Control (VOL)
The MAX9750 features an analog volume control that
varies the gain of the device in 31 discrete steps based
upon the DC voltage applied to VOL. The input range of
to V
through a 10µA current source.
DD
BIAS
The MAX9750/MAX9751/MAX9755 feature an internally
generated, power-supply independent, common-mode
bias voltage of 1.8V referenced to GND. BIAS provides
both click-and-pop suppression and sets the DC bias
level for the amplifiers. Choose the value of the bypass
capacitor as described in the BIAS Capacitor section.
No external load should be applied to BIAS. Any load
lowers the BIAS voltage, affecting the overall perfor-
mance of the device.
V
is from 0 (full volume) to 0.858 x HPV
(full mute),
VOL
DD
with example step sizes shown in Table 3. Connect the
reference of the device driving VOL (Figure 6) to HPV
Since the volume control ADC is ratiometric to HPV
.
,
DD
DD
any changes in HPV
are negated. The gain step sizes
DD
are not constant; the step sizes are 0.5dB/step at the
upper extreme, 2dB/step in the midrange, and 4dB/step
at the lower extreme. Figure 7 shows the transfer function
of the volume control for a 3.3V supply.
______________________________________________________________________________________ 13
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
Table 1. MAX9750 Maximum Gain Settings
SPꢀAKꢀR MODꢀ GAIN (dB)
GAIN1
GAIN2
HꢀADPHONꢀ MODꢀ GAIN (dB)
MAX9750A
MAX9750B
MAX9750C
0
0
1
1
0
1
0
1
9
15
18
6
9
0
0
3
3
12
10.5
13.5
16.5
19.5
7.5
10.5
Table 2. MAX9751 Gain Settings
SPꢀAKꢀR MODꢀ
GAIN (dB)
HꢀADPHONꢀ
MODꢀ GAIN (dB)
GAIN
MAX9750
HPV
VOL
DD
0
1
10.5
9
3
0
V
REF
DAC
BEEP Input
The MAX9750 features an audible alert beep input
(BEEP) that accepts a mono system alert signal and
mixes it into the stereo audio path. When the amplitude
Figure 6. Volume Control Circuit
of V
exceeds 800mV
(Figure 8) and the
P-P
BEEP(OUT)
Input Multiplexer
frequency of the beep signal is greater than 300Hz, the
beep signal is mixed into the active audio path (speaker
The MAX9751 features a 2:1 input multiplexer on each
amplifier, allowing input selection between two stereo
sources. The logic input IN1/2 controls both multiplex-
ers. A logic high selects input IN_1 and a logic low
selects input IN_2.
or headphone). If the signal at V
is either
BEEP(OUT)
<800mV
or <300Hz, the BEEP signal is not mixed into
the audio path. The amplitude of the BEEP signal at the
P-P
device output is roughly the amplitude of V
times the gain of the selected signal path.
BEEP(OUT)
Shutdown
The MAX9750/MAX9751/MAX9755 features a 0.2µA,
low-power shutdown mode that reduces quiescent cur-
rent consumption and extends battery life. Driving
SHDN low disables the drive amplifiers, bias circuitry,
and charge pump, and drives BIAS and all outputs to
The input resistor (R ) sets the gain of the BEEP input
B
amplifier, and thus the amplitude of V
. Choose
BEEP(OUT)
R based on:
B
V
× R
0.8
IN
INT
R
≤
B
GND. Connect SHDN to V
for normal operation.
DD
Click-and-Pop Suppression
where R
is the value of the BEEP amplifier feedback
INT
resistor (47kΩ) and V is the BEEP input amplitude.
IN
Speaker Amplifier
The MAX9750/MAX9751/MAX9755 speaker amplifiers
feature Maxim’s comprehensive, industry-leading click-
and-pop suppression. During startup, the click-pop
suppression circuitry eliminates any audible transient
sources internal to the device. When entering shut-
down, both amplifier outputs ramp to GND quickly and
simultaneously.
Note that the BEEP amplifier can be set up as either an
attenuator, if the original alert signal amplitude is too
large, or set to gain up the alert signal if it is below
800mV . AC couple the alert signal to BEEP. Choose
P-P
the value of the coupling capacitor as described in the
Input Filtering section. Multiple beep inputs can be
summed (Figure 8).
14 ______________________________________________________________________________________
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
Table 3a. MAX9750A Volume Levels
V
VOL
(V)
SPꢀAKꢀR MODꢀ GAIN (dB)
HꢀADPHONꢀ MODꢀ GAIN (dB)
GAIN1 = 0,
GAIN2 = 0
GAIN1 = 1,
GAIN2 = 0
GAIN1 = 0,
GAIN2 = 1
GAIN1 = 1
GAIN2 = 1
GAIN1 = X,
GAIN2 = 0
GAIN1 = X,
GAIN2 = 1
V
MIN
*
V
MAX
*
HPV
*
DD
0
0.49
0.074
0.160
0.183
0.207
0.230
0.253
0.277
0.300
0.324
0.347
0.371
0.394
0.418
0.441
0.464
0.488
0.511
0.535
0.558
0.582
0.605
0.628
0.652
0.675
0.699
0.722
0.746
0.769
0.793
0.816
0.839
0.858
9
8
10.5
10
12
11.5
11
13.5
13
0
-1
3
2.5
2
0.49
0.5673
0.6447
0.722
0.5673
0.6447
0.722
7
9
12.5
12
-2
6
8
10.5
10
-3
1.5
1
0.7994
0.8767
0.9541
1.0314
1.1088
1.1861
1.2635
1.3408
1.4182
1.4955
1.5728
1.6502
1.7275
1.8049
1.8822
1.9596
2.0369
2.1143
2.1916
2.269
4
7
11.5
11
-5
0.7994
0.8767
0.9541
1.0314
1.1088
1.1861
1.2635
1.3408
1.4182
1.4955
1.5728
1.6502
1.7275
1.8094
1.8822
1.9596
2.0369
2.1143
2.1916
2.269
2
6
9
-7
0
0
4
8
10.5
10
-9
-
-2
2
7
-11
-13
-15
-17
-19
-21
-23
-25
-27
-29
-31
-33
-35
-37
-39
-41
-3
-2
-4
0
6
9
-3
-6
-2
4
8
-5
-8
-4
2
7
-7
-10
-12
-14
-16
-18
-20
-22
-24
-26
-28
-30
-32
-34
-38
-42
-46
-50
-54
-58
-62
MUTE
-6
0
6
-9
-8
-2
4
-11
-13
-15
-17
-19
-21
-23
-25
-27
-29
-31
-33
-35
-37
-39
-41
-43
-47
-51
MUTE
-10
-12
-14
-16
-18
-20
-22
-24
-26
-28
-30
-32
-34
-38
-42
-46
-50
-54
MUTE
-4
2
-6
0
-8
-2
-10
-12
-14
-16
-18
-20
-22
-24
-26
-28
-30
-32
-34
-38
-42
MUTE
-4
-6
-8
-10
-12
-14
-16
-18
-20
-22
-24
-26
-28
-30
-32
MUTE
2.3463
2.4237
2.501
-47
-51
-55
-59
-63
-67
-71
MUTE
2.3463
2.4237
2.501
2.5783
2.6557
2.733
2.5783
2.6557
2.733
2.8104
3.3
2.8104
*Based on HPV = 3.3V
DD
X = Don’t care.
______________________________________________________________________________________ 15
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
Table 3B. MAX9750B Volume Levels
HꢀADPHONꢀ MODꢀ GAIN
(dB)
V
VOL
(V)
SPꢀAKꢀR MODꢀ GAIN (dB)
GAIN1 = 0,
GAIN2 = 0
GAIN1 = 1,
GAIN2 = 0
GAIN1 = 0,
GAIN2 = 1
GAIN1 = 1
GAIN2 = 1
GAIN1 = X,
GAIN2 = 0
GAIN1 = X,
GAIN2 = 1
V
MIN
*
V
MAX
*
HPV
*
DD
0
0.49
0.074
0.160
0.183
0.207
0.230
0.253
0.277
0.300
0.324
0.347
0.371
0.394
0.418
0.441
0.464
0.488
0.511
0.535
0.558
0.582
0.605
0.628
0.652
0.675
0.699
0.722
0.746
0.769
0.793
0.816
0.839
0.858
15
14
16.5
16
18
17.5
17
19.5
19
0
-1
3
2.5
2
0.49
0.5673
0.6447
0.722
0.5673
0.6447
0.722
13
15
18.5
18
-2
12
14
16.5
16
-3
1.5
1
0.7994
0.8767
0.9541
1.0314
1.1088
1.1861
1.2635
1.3408
1.4182
1.4955
1.5728
1.6502
1.7275
1.8049
1.8822
1.9596
2.0369
2.1143
2.1916
2.269
10
13
17.5
17
-5
0.7994
0.8767
0.9541
1.0314
1.1088
1.1861
1.2635
1.3408
1.4182
1.4955
1.5728
1.6502
1.7275
1.8049
1.8822
1.9596
2.0369
2.1143
2.1916
2.269
8
12
15
-7
0
6
10
14
16.5
16
-9
-1
4
8
13
-11
-13
-15
-17
-19
-21
-23
-25
-27
-29
-31
-33
-35
-37
-39
-41
-43
-47
-51
-55
-59
-63
-67
-71
MUTE
-2
2
6
12
15
-3
0
4
10
14
-5
-2
2
8
13
-7
-4
0
6
12
-9
-6
-2
4
10
-11
-13
-15
-17
-19
-21
-23
-25
-27
-29
-31
-33
-35
-37
-39
-41
-43
-47
-51
MUTE
-8
-4
2
8
-10
-12
-14
-16
-18
-20
-22
-24
-26
-28
-32
-36
-40
-44
-48
-52
-56
MUTE
-6
0
6
-8
-2
4
-10
-12
-14
-16
-18
-20
-22
-24
-26
-28
-32
-36
-40
-44
-48
MUTE
-4
2
-6
0
-8
-2
-10
-12
-14
-16
-18
-20
-22
-24
-26
-28
-32
-36
MUTE
-4
-6
-8
-10
-12
-14
-16
-18
-20
-22
-24
-26
MUTE
2.3463
2.4237
2.501
2.3463
2.4237
2.501
2.5783
2.6557
2.733
2.5783
2.6557
2.733
2.8104
3.3
2.8104
*Based on HPV = 3.3V
DD
X = Don’t care.
16 ______________________________________________________________________________________
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
Table 3C. MAX9750C Volume Levels
V
VOL
(V)
SPꢀAKꢀR MODꢀ GAIN (dB)
HꢀADPHONꢀ MODꢀ GAIN (dB)
GAIN1 = 0,
GAIN2 = 0
GAIN1 = 1,
GAIN2 = 0
GAIN1 = 0,
GAIN2 = 1
GAIN1 = 1
GAIN2 = 1
GAIN1 = X,
GAIN2 = 0
GAIN1 = X,
GAIN2 = 1
V
MIN
*
V
MAX
*
HPV
*
DD
0
0.49
0.074
0.160
0.183
0.207
0.230
0.253
0.277
0.300
0.324
0.347
0.371
0.394
0.418
0.441
0.464
0.488
0.511
0.535
0.558
0.582
0.605
0.628
0.652
0.675
0.699
0.722
0.746
0.769
0.793
0.816
0.839
0.858
6
5
7.5
7
9
8.5
8
10.5
10
9.5
9
0
-1
3
2.5
2
0.49
0.5673
0.6447
0.722
0.5673
0.6447
0.722
4
6
-2
3
5
7.5
7
-3
1.5
1
0.7994
0.8767
0.9541
1.0314
1.1088
1.1861
1.2635
1.3408
1.4182
1.4955
1.5728
1.6502
1.7275
1.8049
1.8822
1.9596
2.0369
2.1143
2.1916
2.269
1
4
8.5
8
-5
0.7994
0.8767
0.9541
1.0314
1.1088
1.1861
1.2635
1.3408
1.4182
1.4955
1.5728
1.6502
1.7275
1.8049
1.8822
1.9596
2.0369
2.1143
2.1916
2.269
-1
3
6
-7
0
-3
1
5
7.5
7
-9
-1
-5
-1
4
-11
-13
-15
-17
-19
-21
-23
-25
-27
-29
-31
-33
-35
-37
-39
-41
-43
-47
-51
-55
-59
-63
-67
-71
MUTE
-2
-7
-3
3
6
-3
-9
-5
1
5
-5
-11
-13
-15
-17
-19
-21
-23
-25
-27
-29
-31
-33
-35
-37
-41
-45
-48
-53
-57
-61
-65
MUTE
-7
-1
4
-7
-9
-3
3
-9
-11
-13
-15
-17
-19
-21
-23
-25
-27
-29
-31
-3
-5
1
-11
-13
-15
-17
-19
-21
-23
-25
-27
-29
-31
-33
-35
-37
-39
-41
-43
-47
-51
MUTE
-7
-1
-9
-3
-11
-13
-15
-17
-9
-5
-7
-9
-11
-13
-15
-17
-19
-21
-23
-25
-27
-29
-31
-33
-35
MUTE
-21
-23
-2
-27
-29
-31
-33
-35
-37
-41
-45
MUTE
2.3463
2.4237
2.501
-35
-37
-41
-45
-49
-53
-57
MUTE
2.3463
2.4237
2.501
2.5783
2.6557
2.733
2.5783
2.6557
2.733
2.8104
3.3
2.8104
*Based on HPV = 3.3V
DD
X = Don’t care.
______________________________________________________________________________________ 17
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
MAX9750A
VOLUME CONTROL TRANSFER FUNCTION
MAX9750B
VOLUME CONTROL TRANSFER FUNCTION
20
10
20
10
GAIN1 = GAIN2 = 0
GAIN1 = GAIN2 = 0
0
0
SPEAKER MODE
SPEAKER MODE
-10
-20
-30
-40
-50
-60
-70
-80
-10
-20
-30
-40
-50
-60
-70
-80
AUDIO
TAPER
AUDIO
TAPER
HEADPHONE MODE
HEADPHONE MODE
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
(V)
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
(V)
V
V
VOL
VOL
Figure 7a. Volume Control Transfer Function
Figure 7b. Volume Control Transfer Function
Headphone Amplifier
MAX9750C
In conventional single-supply headphone amplifiers,
the output-coupling capacitor is a major contributor of
audible clicks and pops. Upon startup, the amplifier
charges the coupling capacitor to its bias voltage, typi-
cally half the supply. Likewise, during shutdown, the
capacitor is discharged to GND. A DC shift across the
capacitor results, which in turn appears as an audible
transient at the speaker. Since the MAX9750/MAX9751/
MAX9755 do not require output-coupling capacitors, no
audible transient occurs.
VOLUME CONTROL TRANSFER FUNCTION
20
GAIN1 = GAIN2 = 0
10
0
-10
SPEAKER MODE
-20
AUDIO
TAPER
-30
-40
-50
HEADPHONE MODE
-60
Additionally, the MAX9750/MAX9751/MAX9755 features
extensive click-and-pop suppression that eliminates
any audible transient sources internal to the device.
The Power-Up/Down Waveform in the Typical
Operating Characteristics shows that there are minimal
spectral components in the audible range at the output
upon startup and shutdown.
-70
-80
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
(V)
V
VOL
Figure 7c. Volume Control Transfer Function
R
S1
0.47µF
0.47µF
0.47µF
47kΩ
R
INT
SOURCE 1
SOURCE 2
SOURCE 3
47kΩ
R
S2
47kΩ
SPEAKER/HEADPHONE
AMPLIFER INPUTS
BEEP
V
OUT(BEEP)
WINDOW
R
S3
47kΩ
DETECTOR
(0.3V THRESHOLD)
P-P
MAX9750
FREQUENCY
DETECTOR
BIAS
(300Hz THRESHOLD)
Figure 8. Beep Input
1± ______________________________________________________________________________________
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
1000
V
DD
= 5V
R = 16Ω
L
100
10
A = 3dB
V
V
+1
-1
OUT(P-P)
OUTPUTS IN PHASE
1
2 x V
OUT(P-P)
0.1
V
OUT(P-P)
0.01
0.001
OUTPUTS 180° OUT OF PHASE
0
25
50
75
100
125
150
OUTPUT POWER (mW)
Figure 9. Bridge-Tied Load Configuration
Figure 10. Total Harmonic Distortion Plus Noise vs. Output Power
with Inputs In/Out of Phase (Headphone Mode)
Power Dissipation and Heat Sinking
Under normal operating conditions, the MAX9750/
MAX9751/MAX9755 can dissipate a significant amount
of power. The maximum power dissipation for each
package is given in the Absolute Maximum Ratings
under Continuous Power Dissipation, or can be calcu-
lated by the following equation:
Applications Information
BTL Speaker Amplifiers
The MAX9750/MAX9751/MAX9755 feature speaker
amplifiers designed to drive a load differentially, a con-
figuration referred to as bridge-tied load (BTL). The BTL
configuration (Figure 9) offers advantages over the sin-
gle-ended configuration, where one side of the load is
connected to ground. Driving the load differentially
doubles the output voltage compared to a single-
ended amplifier under similar conditions. Thus, the
device’s differential gain is twice the closed-loop gain
of the input amplifier. The effective gain is given by:
T
− T
A
J(MAX)
P
=
DISSPKG(MAX)
θ
JA
where T
is +150°C, T is the ambient tempera-
A
J(MAX)
ture, and θ is the reciprocal of the derating factor in
JA
°C/W as specified in the Absolute Maximum Ratings
section. For example, θ of the thin QFN package is
JA
R
F
A
= 2×
+42°C/W. For optimum power dissipation, the exposed
paddle of the package should be connected to the
ground plane (see the Layout and Grounding section).
VD
R
IN
Substituting 2 X V
into the following equation
OUT(P-P)
yields four times the output power due to double the
output voltage:
Output Power (Speaker Amplifier)
The increase in power delivered by the BTL configura-
tion directly results in an increase in internal power dis-
sipation over the single-ended configuration. The
V
OUT(P−P)
V
=
=
RMS
maximum power dissipation for a given V
given by the following equation:
and load is
DD
2 2
2
V
RMS
P
2
OUT
2V
DD
R
P
=
L
DISS(MAX)
2
π R
Since the differential outputs are biased at midsupply,
there is no net DC voltage across the load. This elimi-
nates the need for DC-blocking capacitors required for
single-ended amplifiers. These capacitors can be large
and expensive, can consume board space, and can
degrade low-frequency performance.
If the power dissipation for a given application exceeds
the maximum allowed for a given package, either reduce
DD
temperature, or add heatsinking to the device. Large
output, supply, and ground PC board traces improve the
maximum power dissipation in the package.
V
, increase load impedance, decrease the ambient
______________________________________________________________________________________ 19
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
Table 4. Suggested Capacitor Manufacturers
SUPPLIꢀR
Taiyo Yuden
TDK
PHONꢀ
FAX
WꢀBSITꢀ
800-348-2496
807-803-6100
847-925-0899
847-390-4405
www.t-yuden.com
www.component.tdk.com
Thermal-overload protection limits total power dissipa-
tion in these devices. When the junction temperature
exceeds +160°C, the thermal-protection circuitry dis-
ables the amplifier output stage. The amplifiers are
enabled once the junction temperature cools by 15°C.
This results in a pulsing output under continuous ther-
mal-overload conditions as the device heats and cools.
1
f
=
−3DB
2πR C
IN IN
R
is the amplifier’s internal input resistance value
IN
given in the Electrical Characteristics. Choose C such
IN
that f
Setting f
is well below the lowest frequency of interest.
-3dB
too high affects the amplifier’s low-fre-
-3dB
Output Power (Headphone Amplifier)
The headphone amplifiers have been specified for the
worst-case scenario—when both inputs are in phase.
Under this condition, the drivers simultaneously draw
current from the charge pump, leading to a slight loss in
quency response. Use capacitors with low-voltage
coefficient dielectrics, such as tantalum or aluminum
electrolytic. Capacitors with high-voltage coefficients,
such as ceramics, may result in increased distortion at
low frequencies.
headroom of V . In typical stereo audio applications,
SS
BIAS Capacitor
the left and right signals have differences in both magni-
tude and phase, subsequently leading to an increase in
the maximum attainable output power. Figure 10 shows
the two extreme cases for in and out of phase. In reality,
the available power lies between these extremes.
BIAS is the output of the internally generated DC bias
voltage. The BIAS bypass capacitor, C
, improves
BIAS
PSRR and THD+N by reducing power supply and other
noise sources at the common-mode bias node, and
also generates the clickless/popless, startup/shutdown
DC bias waveforms for the speaker amplifiers. Bypass
BIAS with a 1µF capacitor to GND.
Power Supplies
The MAX9750/MAX9751/MAX9755 have different sup-
plies for each portion of the device, allowing for the opti-
mum combination of headroom and power dissipation
and noise immunity. The speaker amplifiers are pow-
Charge-Pump Capacitor Selection
Use capacitors with an ESR less than 100mΩ for opti-
mum performance. Low-ESR ceramic capacitors mini-
mize the output resistance of the charge pump. For
best performance over the extended temperature
range, select capacitors with an X7R dielectric. Table 4
lists suggested manufacturers.
ered from PV . PV
ranges from 4.5V to 5.5V. The
DD
DD
headphone amplifiers are powered from HPV
and
DD
V
. HPV
is the positive supply of the headphone
SS
DD
amplifiers and ranges from 3V to 5.5V. V is the nega-
SS
tive supply of the headphone amplifiers. Connect V to
SS
DD
CPV . The charge pump is powered by CPV
.
SS
Flying Capacitor (C1)
The value of the flying capacitor (C1) affects the load
regulation and output resistance of the charge pump. A
C1 value that is too small degrades the device’s ability
to provide sufficient current drive, which leads to a loss
of output voltage. Increasing the value of C1 improves
load regulation and reduces the charge-pump output
resistance to an extent. See the Output Power vs.
Charge-Pump Capacitance and Load Resistance
graph in the Typical Operating Characteristics. Above
2.2µF, the on-resistance of the switches and the ESR of
C1 and C2 dominate.
CPV
ranges from 3V to 5.5V and should be the same
DD
potential as HPV . The charge pump inverts the volt-
DD
age at CPV , and the resulting voltage appears at
DD
CPV . The remainder of the device is powered by V
.
SS
DD
Component Selection
Input Filtering
The input capacitor (C ), in conjunction with the ampli-
IN
fier input resistance (R ), forms a highpass filter that
IN
removes the DC bias from an incoming signal (see the
Typical Application Circuit). The AC-coupling capacitor
allows the amplifier to bias the signal to an optimum DC
level. Assuming zero source impedance, the -3dB point
of the highpass filter is given by:
20 ______________________________________________________________________________________
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
MAX9751/MAX9755 to provide the negative supply for
the headphone amplifiers. It can also be used to power
22µF
other devices within a design. Current draw from
OUTL+
CPV should be limited to 5mA, exceeding this affects
SS
1µF
1µF
OUTL-
the operation of the headphone amplifier. A typical
application is a negative supply to adjust the contrast
of LCD modules.
INL
INR
MAX9750
22µF
When considering the use of CPV
in this manner,
SS
OUTR+
OUTR-
note that the charge-pump voltage of CPV is roughly
SS
proportional to CPV
and is not a regulated voltage.
DD
The charge-pump output impedance plot appears in
the Typical Operating Characteristics.
20kΩ
20kΩ
10kΩ
Layout and Grounding
Proper layout and grounding are essential for optimum
performance. Use large traces for the power-supply
inputs and amplifier outputs to minimize losses due to
parasitic trace resistance, as well as route head away
from the device. Good grounding improves audio per-
formance, minimizes crosstalk between channels, and
prevents any switching noise from coupling into the
audio signal. Connect CPGND, PGND and GND
together at a single point on the PC board. Route
CPGND and all traces that carry switching transients
away from GND, PGND, and the traces and compo-
nents in the audio signal path.
22nF
10kΩ
IN
10nF
MAX9711
OUT-
OUT+
Figure 11. Stereo Plus Subwoofer Application Circuit
Connect all components associated with the charge
Output Capacitor (C2)
pump (C2 and C3) to the CPGND plane. Connect V
SS
The output capacitor value and ESR directly affect the
and CPV
together at the device. Place the charge-
SS
ripple at CPV . Increasing the value of C2 reduces
SS
pump capacitors (C1, C2, and C3) as close to the
device as possible. Bypass HPV and PV with a
output ripple. Likewise, decreasing the ESR of C2
reduces both ripple and output resistance. Lower
capacitance values can be used in systems with low
maximum output power levels. See the Output Power
vs. Charge-Pump Capacitance and Load Resistance
graph in the Typical Operating Characteristics.
DD
DD
0.1µF capacitor to GND. Place the bypass capacitors
as close to the device as possible.
Use large, low-resistance output traces. As load imped-
ance decreases, the current drawn from the device out-
puts increase. At higher current, the resistance of the
output traces decrease the power delivered to the load.
For example, when compared to a 0Ω trace, a 100mΩ
trace reduces the power delivered to a 4Ω load from
2.1W to 2W. Large output, supply, and GND traces also
improve the power dissipation of the device.
CPV
Bypass Capacitor
DD
The CPV
bypass capacitor (C3) lowers the output
DD
impedance of the power supply and reduces the
impact of the MAX9750/MAX9751/MAX9755’s charge-
pump switching transients. Bypass CPV
with C3, the
DD
same value as C1, and place it physically close to
CPV and PGND (refer to the MAX9750 Evaluation Kit
The MAX9750/MAX9751/MAX9755 thin QFN and
TSSOP-EP packages feature exposed thermal pads on
their undersides. This pad lowers the package’s ther-
mal resistance by providing a direct heat conduction
path from the die to the printed circuit board. Connect
the exposed thermal pad to GND by using a large pad
and multiple vias to the GND plane.
DD
for a suggested layout).
Powering Other Circuits from a
Negative Supply
An additional benefit of the MAX9750/MAX9751/
MAX9755 is the internally generated negative supply
voltage (CPV ). CPV
is used by the MAX9750/
SS
SS
______________________________________________________________________________________ 21
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
Simplified Block Diagrams (continued)
MUX
MAX9751
MAX9755
22 ______________________________________________________________________________________
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
Block Diagrams
4.5V TO 5.5V
0.1µF
V
DD
25
(1)
6, 16
(10, 20)
PV
DD
4.5V TO 5.5V
0.1µF
MAX9750
4
(8)
C
1µF
IN
1
(5)
OUTL+
OUTL-
GAIN/
VOLUME
CONTROL
INL
BTL
AMPLIFIER
5
(9)
LEFT-CHANNEL
AUDIO INPUT
18
(22)
C
1µF
IN
27
(3)
OUTR+
GAIN/
VOLUME
CONTROL
INR
BTL
AMPLIFIER
RIGHT-CHANNEL
AUDIO INPUT
17
(21) OUTR-
21
(25)
BIAS
VOL
15
(19)
28
(4)
C
1µF
BIAS
HPV
HPS
DD
3V TO 5.5V
0.1µF
GAIN/
VOLUME
CONTROL
20
(24)
24
(28)
GAIN1
GAIN2
BEEP
V
V
DD
23
(27)
HEADPHONE
DETECTION
14
(18)
DD
HPOUTL
2
(6)
0.47µF
47kΩ
BEEP
DETECTION
22
(26)
13
(17)
SHUTDOWN
CONTROL
SHDN
V
DD
HPOUTR
7
CPV
(11)
DD
3V TO 5.5V
8
(12)
10
(14)
1µF
C1P
C1
1µF
CHARGE
PUMP
C1N
9
(13)
CPGND
26
(2)
3, 19
(7, 23)
11 12
(15) (16)
CPV
V
SS
GND
PGND
SS
C2
1µF
( ) TSSOP PIN.
______________________________________________________________________________________ 23
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
Block Diagrams (continued)
4.5V TO 5.5V
0.1µF
V
DD
25
(1)
6, 16 (10, 20)
PV
DD
4.5V TO 5.5V
0.1µF
MAX9751
1
(5)
C
1µF
4
(8)
IN
INL1
OUTL+
OUTL-
LEFT CHANNEL
AUDIO INPUT
BTL
AMPLIFIER
5
(9)
C
1µF
2
INPUT
MUX
IN
INL2 (6)
LEFT CHANNEL
AUDIO INPUT
27
(3)
C
1µF
18
(22)
IN
INR1
RIGHT CHANNEL
AUDIO INPUT
OUTR+
OUTR-
BTL
AMPLIFIER
INPUT
MUX
28
(4)
17
(21)
C
1µF
IN
INR2
RIGHT CHANNEL
AUDIO INPUT
21
(25)
BIAS
15
C
1µF
BIAS
(19)
HPV
HPS
DD
3V TO 5.5V
0.1µF
20
(24)
MUX AND
GAIN
CONTROL
24
(28)
GAIN
IN1/2
SHDN
V
V
DD
23
(27)
14
(18)
HPOUTL
HEADPHONE
DETECTION
DD
22
(26)
V
DD
SHUTDOWN
CONTROL
13
(17)
HPOUTR
7
CPV
(11)
DD
3V TO 5.5V
1µF
8
(12)
C1P
C1
1µF
10
(14)
CHARGE
PUMP
C1N
9
(13)
CPGND
26
(2)
3, 19
(7, 23)
11 12
(15) (16)
CV
SS
V
SS
GND
PGND
C2
1µF
( ) TSSOP PIN.
LOGIC PINS CONFIGURED FOR:
GAIN = 1, 9dB SPEAKER GAIN/0dB HEADPHONE GAIN.
IN1/2 = 1, SELECTED INPUT LINE 1.
SHDN = 1, PART ACTIVE.
24 ______________________________________________________________________________________
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
Block Diagrams (continued)
4.5V TO 5.5V
0.1µF
V
DD
25
(1)
6, 16
(10, 20)
PV
DD
4.5V TO 5.5V
0.1µF
MAX9755
4
(8)
C
1µF
2
OUTL+
OUTL-
IN
INL (6)
BTL
AMPLIFIER
5
(9)
LEFT CHANNEL
AUDIO INPUT
18
(22)
28
OUTR+
C
IN
(4)
1µF
INR
BTL
AMPLIFIER
RIGHT CHANNEL
AUDIO INPUT
17
(21) OUTR-
21
(25)
BIAS
15
C
1µF
BIAS
(19)
HPV
HPS
DD
3V TO 5.5V
0.1µF
20
(24)
GAIN
CONTROL
24
(28)
GAIN
V
V
DD
14
(18)
HEADPHONE
DETECTION
HPOUTL
22
(26)
SHDN
DD
SHUTDOWN
CONTROL
13
(17)
HPOUTR
7
CPV
(11)
DD
3V TO 5.5V
1µF
8
(12)
C1P
C1
1µF
10
(14)
CHARGE
PUMP
C1N
9
(13)
CPGND
23, 26
(2, 27)
3, 19
(7, 23)
11 12
(15) (16)
CPV
V
SS
GND
PGND
SS
C2
1µF
( ) TSSOP PIN.
LOGIC PINS CONFIGURED FOR:
GAIN = 1, 9dB SPEAKER GAIN/0dB HEADPHONE GAIN.
SHDN = 1, PART ACTIVE.
______________________________________________________________________________________ 25
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
System Diagrams
4.5V TO 5.5V 3V TO 5.5V
0.1µF
0.1µF
1µF
V
PV
HPV
DD
DD
DD
BIAS
OUTL+
OUTL-
MAX9750
1µF
1µF
1µF
1µF
OUTR+
OUTR-
AUX_IN
INL
OUT
CODEC
INR
HPS
33kΩ
2kΩ
MAX4060
BEEP
BIAS
HPOUTL
HPOUTR
2kΩ
SHDN
GAIN1
GAIN2
HPV
DD
µC
1µF
1µF
IN+
IN-
VOL
CPV
SS
3V TO 5.5V
CPV
DD
1µF
V
1µF
C1P
SS
1µF
CPGND
C1N
GND
PGND
26 ______________________________________________________________________________________
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
System Diagrams (continued)
4.5V TO 5.5V 3V TO 5.5V
0.1µF
0.1µF
V
PV
HPV
DD
DD
DD
1µF
OUTL+
OUTL-
INL1
INL2
CODEC
MAX9751
1µF
OUTR+
OUTR-
AUX_IN
1µF
INR1
INR2
OUT
2kΩ
HPS
MAX4060
BIAS
HPOUTL
HPOUTR
SHDN
IN1/2
GAIN
CPV
2kΩ
µC
1µF
1µF
IN+
IN-
CPV
SS
3V TO 5.5V
DD
1µF
V
C1P
1µF
SS
1µF
CPGND
BIAS
C1N
GND
PGND
1µF
Chip Information
MAX9750 TRANSISTOR COUNT: 9591
MAX9751 TRANSISTOR COUNT: 8632
MAX9755 TRANSISTOR COUNT: 7834
PROCESS: BiCMOS
______________________________________________________________________________________ 27
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
Pin Configurations
TOP VIEW
V
1
2
28 GAIN1
27 GND
V
1
2
28 GAIN1
27 GAIN2
26 SHDN
25 BIAS
V
1
2
28 GAIN1
27 IN1/2
26 SHDN
25 BIAS
DD
DD
DD
GND
N.C.
GND
INR
GND
INR1
3
26 SHDN
25 BIAS
24 HPS
3
3
INR
4
VOL
4
INR2
4
N.C.
5
INL
5
24 HPS
INL1
5
24 HPS
MAX9755
MAX9751
MAX9750
INL
6
23 PGND
22 OUTR+
21 OUTR-
BEEP
PGND
OUTL+
OUTL-
6
23 PGND
22 OUTR+
21 OUTR-
INL2
6
23 PGND
22 OUTR+
21 OUTR-
PGND
OUTL+
OUTL-
7
7
PGND
OUTL+
OUTL-
7
8
8
8
9
20 PV
DD
9
20 PV
DD
9
20 PV
DD
PV
DD
10
11
19 HPV
DD
PV
DD
10
11
19 HPV
DD
PV
DD
10
11
19 HPV
DD
CPV
DD
18 HPOUTL
17 HPOUTR
CPV
DD
18 HPOUTL
17 HPOUTR
CPV
DD
18 HPOUTL
17 HPOUTR
C1P 12
CPGND 13
C1N 14
C1P 12
CPGND 13
C1N 14
C1P 12
CPGND 13
C1N 14
16
V
SS
16
V
16 V
SS
SS
15 CPV
15 CPV
15 CPV
SS
SS
SS
TSSOP-ꢀP
TSSOP-ꢀP
TSSOP-ꢀP
TOP VIEW
INL1
1
2
3
4
5
6
7
21 BIAS
20 HPS
19 PGND
INL
BEEP
1
2
3
4
5
6
7
21 BIAS
INL2
PGND
OUTL+
OUTL-
20 HPS
PGND
OUTL+
OUTL-
19 PGND
18 OUTR+
17 OUTR-
MAX9751
MAX9750
18 OUTR+
17 OUTR-
PV
DD
16 PV
DD
PV
DD
16 PV
DD
CPV
DD
15 HPV
DD
CPV
DD
15 HPV
DD
THIN QFN
THIN QFN
N.C.
INL
1
2
3
4
5
6
7
21 BIAS
20 HPS
PGND
19 PGND
18 OUTR+
17 OUTR-
MAX9755
OUTL+
OUTL-
PV
16 PV
DD
DD
DD
CPV
15 HPV
DD
THIN QFN
2± ______________________________________________________________________________________
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
D2
0.15
C A
D
b
0.10 M
C A B
C
L
D2/2
D/2
k
PIN # 1
I.D.
0.15
C
B
PIN # 1 I.D.
0.35x45∞
E/2
E2/2
C
(NE-1) X
e
L
E2
E
k
L
DETAIL A
e
(ND-1) X
e
C
C
L
L
L
L
e
e
0.10
C
A
0.08
C
C
A3
A1
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE
16, 20, 28, 32L, QFN THIN, 5x5x0.8 mm
APPROVAL
DOCUMENT CONTROL NO.
REV.
1
21-0140
C
2
COMMON DIMENSIONS
EXPOSED PAD VARIATIONS
NOTES:
1. DIMENSIONING & TOLERANCING CONFORM TO ASME Y14.5M-1994.
2. ALL DIMENSIONS ARE IN MILLIMETERS. ANGLES ARE IN DEGREES.
3. N IS THE TOTAL NUMBER OF TERMINALS.
4. THE TERMINAL #1 IDENTIFIER AND TERMINAL NUMBERING CONVENTION SHALL CONFORM TO JESD 95-1
SPP-012. DETAILS OF TERMINAL #1 IDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED WITHIN THE
ZONE INDICATED. THE TERMINAL #1 IDENTIFIER MAY BE EITHER A MOLD OR MARKED FEATURE.
5. DIMENSION b APPLIES TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 0.25 mm AND 0.30 mm
FROM TERMINAL TIP.
6. ND AND NE REFER TO THE NUMBER OF TERMINALS ON EACH D AND E SIDE RESPECTIVELY.
7. DEPOPULATION IS POSSIBLE IN A SYMMETRICAL FASHION.
8. COPLANARITY APPLIES TO THE EXPOSED HEAT SINK SLUG AS WELL AS THE TERMINALS.
9. DRAWING CONFORMS TO JEDEC MO220.
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE
10. WARPAGE SHALL NOT EXCEED 0.10 mm.
16, 20, 28, 32L, QFN THIN, 5x5x0.8 mm
APPROVAL
DOCUMENT CONTROL NO.
REV.
2
21-0140
C
2
______________________________________________________________________________________ 29
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
PACKAGE OUTLINE, TSSOP, 4.40 MM BODY
EXPOSED PAD
1
C
21-0108
1
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
30 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2004 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
This datasheet has been download from:
www.datasheetcatalog.com
Datasheets for electronics components.
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