MAX4299EWP+

更新时间:2024-09-18 18:23:05
品牌:ROCHESTER
描述:SPECIALTY CONSUMER CIRCUIT, PDSO20, 0.300 INCH, MS-013, SOIC-20

MAX4299EWP+ 概述

SPECIALTY CONSUMER CIRCUIT, PDSO20, 0.300 INCH, MS-013, SOIC-20 其他商用集成电路

MAX4299EWP+ 规格参数

是否无铅: 不含铅是否Rohs认证: 符合
生命周期:Active零件包装代码:SOIC
包装说明:0.300 INCH, MS-013, SOIC-20针数:20
Reach Compliance Code:unknown风险等级:5.63
商用集成电路类型:CONSUMER CIRCUITJESD-30 代码:R-PDSO-G20
JESD-609代码:e3长度:12.8 mm
湿度敏感等级:1功能数量:1
端子数量:20最高工作温度:85 °C
最低工作温度:-40 °C封装主体材料:PLASTIC/EPOXY
封装代码:SOP封装形状:RECTANGULAR
封装形式:SMALL OUTLINE峰值回流温度(摄氏度):260
认证状态:COMMERCIAL座面最大高度:2.65 mm
最大供电电压 (Vsup):5.5 V最小供电电压 (Vsup):4.5 V
表面贴装:YES技术:BICMOS
温度等级:INDUSTRIAL端子面层:MATTE TIN
端子形式:GULL WING端子节距:1.27 mm
端子位置:DUAL处于峰值回流温度下的最长时间:NOT SPECIFIED
宽度:7.5 mmBase Number Matches:1

MAX4299EWP+ 数据手册

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19-1743; Rev 1; 2/01  
Ult ra -Hig h P S RR S t e re o Drive rs +  
Mic ro p h o n e Am p + 1 0 0 m A Lin e a r Re g u la t o r  
Ge n e ra l De s c rip t io n  
Fe a t u re s  
The MAX4298 a nd MAX4299 a re a udio syste m ICs  
designed for single +5V applications. The MAX4299  
fe a ture s a s te re o he a d p hone d rive r, a mic rop hone  
amplifier, and a +3.3V linear regulator; the MAX4298  
fe a ture s the s te re o he a d p hone d rive r only. The  
MAX4298/ MAX4299 are designed specifically for harsh  
digital environments where board space is at a premi-  
um and the digital power supply is noisy. The design  
uses innovative design techniques to achieve ultra-high  
power-supply rejection across the audio signal band  
while, at the same time, delivering a high-current Rail-  
to-Rail® output drive capability. The chip is designed to  
drive highly capacitive loads that may be encountered  
when driving long cables to a remote load such as  
d e s ktop /note b ook he a d p hone s or s p e a ke rs . The s e  
devices are fully compliant with PC99 standards.  
Audio System IC (MAX4299)  
Ultra-High PSRR Stereo Headphone Driver  
Ultra-High PSRR Microphone Amp  
100mA, 3.3V Linear Regulator  
93dB typ PSRR at 20kHz Operates Directly from  
Noisy Digital Supplies  
Clickless/Popless Power-Up, Power-Down, Mute  
and Unmute  
PC99-Compliant Output Drivers:  
Better than 1V  
Output into 16Load and  
RMS  
1.5V  
and 0.0008% THD+N into 10kLoad  
RMS  
PC99-Compliant Microphone Amplifier:  
0.005% THD+N into 10kLoad  
22nF Capacitive Load Drive Capability  
4.5V to 5.5V Single-Supply Operation  
Internally Generated Bias Voltage  
All Gains Externally Adjustable  
The amplifiers exhibit 115dB of DC power-supply rejec-  
tion and 80dB at 100kHz. The output amplifiers are  
capable of driving a 1.5V  
signal into a 10kload  
RMS  
with 0.0008% THD+N. They can also drive 32head-  
phones to 1.2V with 0.02% distortion. At +3.3V, the  
Available in Space-Saving Packages  
10-Pin µMAX (MAX4298)  
RMS  
line a r re g ula tor c a n outp ut 100mA of c urre nt. The  
MAX4298 is available in a tiny 10-pin µMAX while the  
MAX4299 is a va ila b le in the s p a c e -s a ving 16-p in  
TSSOP package.  
16-Pin TSSOP (MAX4299)  
Ord e rin g In fo rm a t io n  
________________________Ap p lic a t io n s  
Notebook and Desktop Audio  
Hands-Free Headsets  
PART  
TEMP. RANGE  
-40ºC to +85°C  
-40ºC to +85°C  
-40ºC to +85°C  
-40ºC to +85°C  
PIN-PACKAGE  
10 µMAX  
14 SO  
MAX4298EUB  
MAX4298ESD  
MAX4299EWP  
MAX4299EUE  
USB Audio Peripherals  
IP Telephones  
20 SO  
Wireless Internet Devices  
MP3 Players/Recorders  
16 TSSOP  
Typical Operating Circuit appears at end of data sheet.  
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.  
P S RR vs . Fre q u e n c y  
P in Co n fig u ra t io n s  
-50  
-60  
TOP VIEW  
-70  
-80  
OUT1  
GND  
IN1  
1
2
3
4
5
10  
9
V
CC  
-90  
OUT2  
IN2  
-100  
MAX4298  
8
-110  
-120  
-130  
BIAS  
7
C
BYPASS  
SV  
CC  
6
MUTE  
-140  
-150  
µMAX  
100  
1k  
10k  
100k  
Pin Configurations continued at end of data sheet.  
FREQUENCY (Hz)  
________________________________________________________________ Maxim Integrated Products  
1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,  
or visit Maxim’s website at www.maxim-ic.com.  
Ult ra -Hig h P S RR S t e re o Drive rs +  
Mic ro p h o n e Am p + 1 0 0 m A Lin e a r Re g u la t o r  
ABSOLUTE MAXIMUM RATINGS  
Supply Voltage (V ) to GND ...............................................+6V  
Continuous Power Dissipation  
CC  
Standby Supply Voltage (SV ) to GND...............................+6V  
CC  
REG, FB, REGON to GND..........................-0.3V to (V + 0.3V)  
CC  
10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW  
14-Pin SO (derate 8.3mW/°C above +70°C)................667mW  
20-Pin SO (derate 10.0mW/°C above +70°C)..............800mW  
16-Pin TSSOP (derate 9.4mW/°C above +70°C) .........755mW  
Operating Temperature Range ..........................-40°C to +85°C  
Storage Temperature Range .............................-65°C to +150°C  
Lead Temperature (soldering, 10s) .................................+300°C  
BIAS, C  
, MUTE, IN_, MICIN to GND ..............-0.3V to the  
Larger of (V +0.3V) or (SV +0.3V)  
BYPASS  
CC  
CC  
OUT_, MICOUT to GND................................-0.3V to the Smaller  
of +5.5V, or (V + 0.3V)  
CC  
Duration of Output Short-Circuit to GND or V ................10min  
CC  
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.  
ELECTRICAL CHARACTERISTICS  
(V = SV = +5V, R = on all outputs, C  
= 1µF, C  
= 1µF, C  
= 10µF (MAX4299), T = T  
to T , unless other-  
MAX  
CC  
CC  
L
BYPASS  
BIAS  
REG  
A
MIN  
wise noted. Load resistors (R ) are terminated to 2.25V. Typical values are at T = +25°C. Specifications apply to both MAX4298 and  
L
A
MAX4299, unless otherwise noted.) (Note 1)  
PARAMETER  
SYMBOL  
CONDITIONS  
Inferred from PSRR test  
MIN  
TYP  
MAX UNITS  
Supply Voltage Range  
V
CC  
4.5  
5.5  
V
MAX4298  
MAX4299  
MAX4298  
MAX4299  
10.2  
10.6  
10.2  
10.6  
300  
7
17.5  
18.0  
17.5  
18.0  
500  
Quiescent Current  
I
mA  
CC  
Mute Quiescent Current  
mA  
V
BIAS  
= 1.125V, V = 0  
CC  
SV Current (Note 2)  
CC  
I
µA  
SVCC  
V
BIAS  
= 2.25V, V = 5.0V  
CC  
DRIVER AMPLIFIERS  
Input Offset Voltage  
Input Bias Current  
V
±1  
0.2  
±10  
mV  
nA  
OS  
I
BIAS  
DC, V = 4.5V to 5.5V  
CC  
115  
93  
Power-Supply Rejection  
Ratio  
PSRR  
f = 20kHz  
dB  
f = 100kHz  
80  
R = 10kΩ  
1.45  
1.2  
1.59  
1.53  
1.48  
L
Output Drive  
V
OUT  
V
RMS  
R = 32Ω  
L
R = 16Ω  
L
1.0  
A = -1V/V, f = 1kHz, R = 10k,  
V
L
0.0008  
0.02  
V
OUT  
= 1.5V  
RMS  
A = -1V/V, f = 1kHz, R = 32,  
V
L
THD + Noise  
0.1  
%
V
OUT  
= 1.2V  
, (Notes 3, 4)  
RMS  
A = -1V/V, f = 1kHz, R = 16,  
V
L
0.04  
V
= 1.0V  
RMS  
OUT  
Full-Scale Signal-to-Noise Ratio  
(Note 4)  
R = 10k,  
L
SNR  
105  
dB  
V
= 1.06V  
, A = -1V/V  
RMS V  
OUT  
Capacitive Drive  
22  
87  
nF  
dB  
Open-Loop Voltage Gain  
Unity-Gain Bandwidth  
A
R = 32, 0.55V V  
V - 0.55V  
76  
VOL  
L
OUT  
CC  
GBW  
1.3  
MHz  
2
_______________________________________________________________________________________  
Ult ra -Hig h P S RR S t e re o Drive rs +  
Mic ro p h o n e Am p + 1 0 0 m A Lin e a r Re g u la t o r  
ELECTRICAL CHARACTERISTICS (continued)  
(V = SV = +5V, R = on all outputs, C  
= 1µF, C  
= 1µF, C  
= 10µF (MAX4299), T = T  
to T , unless other-  
MAX  
CC  
CC  
L
BYPASS  
BIAS  
REG  
A
MIN  
wise noted. Load resistors (R ) are terminated to 2.25V. Typical values are at T = +25°C. Specifications apply to both MAX4298 and  
L
A
MAX4299, unless otherwise noted.) (Note 1)  
PARAMETER  
BIAS VOLTAGE OUTPUT  
DC BIAS Voltage  
SYMBOL  
CONDITIONS  
MIN  
TYP  
MAX UNITS  
V
BIAS  
I = 0  
2.13  
2.25  
120  
50  
2.37  
V
L
Line Regulation  
dB  
mV  
Load Regulation  
I = 0 to 1µA  
L
DIGITAL INPUTS (MUTE for MAX4298/MAX4299, and REG  
for MAX4299)  
ON  
Input Voltage High  
Input Voltage Low  
Input Leakage Current  
V
2.4  
V
V
INH  
V
INL  
0.8  
I
V
V
±1  
µA  
IN  
IN = 0 or CC  
MICROPHONE AMPLIFIER (MAX4299 only)  
Input Offset Voltage  
Input Bias Current  
V
±2  
0.2  
±10  
mV  
nA  
OS  
IBIAS  
DC, V = 4.5V to 5.5V  
CC  
115  
93  
Power-Supply Rejection Ratio  
PSRR  
dB  
f = 20kHz  
f = 100kHz  
80  
Voltage Gain  
Output Drive  
A
R = 10k, 0.13V V  
V - 0.13V  
80  
100  
1.58  
0.005  
0.03  
dB  
VOL  
L
MICOUT  
CC  
V
OUT  
R = 10kΩ  
L
1.4  
V
RMS  
A = -1V/V  
V
f = 1kHz, R = 10k,  
L
THD + Noise (Note 4)  
THD+N  
SNR  
%
V
= 1.5V  
RMS  
MICOUT  
A = -10V/V  
V
Full-Scale Signal-to-Noise Ratio  
(Note 4)  
R = 10k, V  
= 1.06V  
, A = -10V/V  
V
80  
dB  
L
MICOUT  
RMS  
All-Hostile Crosstalk  
f = 10kHz (Note 5)  
80  
1
dB  
Unity Gain Bandwidth  
GBW  
MHz  
REGULATOR (MAX4299 only)  
V
= 4.5V to 5.5V. I = 0 to 100mA, using  
L
CC  
Regulator Output Voltage  
Line Regulation  
Load Regulation  
FB Voltage  
V
3.15  
3.3  
3.45  
V
REG  
internal feedback  
V
CC  
= 4.5V to 5.5V, I = 50mA  
0.2  
30  
mV  
mV  
mV  
V
L
I = 10mA to 100mA  
L
I = 0 to 100mA  
L
50  
V
Reference for regulator adjustment  
1.233  
FB  
Note 1: All devices are 100% production tested at T = +25°C. All temperature limits are guaranteed by design.  
A
Note 2: Current drawn from SV when V < 4V.  
CC  
CC  
Note 3: Guaranteed by design.  
Note 4: Measurement bandwidth is 20Hz to 22kHz.  
Note 5: Voltage at MICOUT with OUT1 = OUT2 = 1V  
into 32.  
RMS  
_______________________________________________________________________________________  
3
Ult ra -Hig h P S RR S t e re o Drive rs +  
Mic ro p h o n e Am p + 1 0 0 m A Lin e a r Re g u la t o r  
Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s  
(V = SV = +5V, typical operating circuit, T = +25°C, unless otherwise noted.)  
CC  
CC  
A
MAX4298  
SUPPLY CURRENT vs. SUPPLY VOLTAGE  
MUTE PERFORMANCE  
POWER-UP/POWER-DOWN  
11.5  
2.5  
2.0  
1.5  
1.0  
0.5  
0
4
3
OUT  
R = 32Ω  
L
11.0  
10.5  
10.0  
9.5  
T = +85°C  
A
OUT  
2
1
T = +25°C  
A
SPEAKER  
0
T = -40°C  
A
9.0  
-1  
-2  
R = 32Ω  
L
SPEAKER  
1.0  
C
AC  
= 220µF  
8.5  
-0.5  
4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6  
0
0.5  
1.5  
2.0  
0
1.0  
2.0  
V
CC  
(V)  
TIME (s)  
TIME (s)  
DRIVER OUT  
THD+N vs. FREQUENCY  
POWER-DOWN/POWER-UP with SCHOTTKY  
DIODE AND RESERVOIR CAPACITOR  
DRIVER OUT  
THD+N vs. FREQUENCY  
1
0.1  
1
0.1  
6
5
V
CC  
= 5V  
V
CC  
= 0  
SV  
CC  
4
BW = 80kHz  
BW = 22kHz  
3
0.01  
0.01  
BW = 80kHz  
BW = 22kHz  
2
V
OUT  
1
0.001  
0.001  
R = 10kΩ  
L
R = 32Ω  
L
0
A = -1  
A = -1  
R = 32Ω  
V
V
L
V
= 1.5V  
V
= 1.2V  
C
= 22OµF  
OUT  
RMS  
OUT RMS  
AC  
-1  
0.0001  
0.0001  
100  
1k  
10k  
100k  
100  
1k  
10k  
100k  
0
0.5  
1.0  
TIME (s)  
1.5  
2.0  
INPUT FREQUENCY (Hz)  
INPUT FREQUENCY (Hz)  
DRIVER OUT  
THD+N vs. FREQUENCY  
DRIVER OUT  
THD+N vs. AMPLITUDE  
DRIVER OUT  
THD+N vs. AMPLITUDE  
1
0.1  
10  
1
10  
1
BW = 22kHz  
BW = 22kHz  
BW = 80kHz  
BW = 22kHz  
f
IN  
= 1kHz  
0.1  
0.01  
0.1  
0.01  
0.01  
0.001  
R = 16Ω  
L
0.001  
0.001  
A = -1  
A = -1  
R = 10kΩ  
L
R = 32Ω  
A = -1  
V
V
V
L
f
IN  
= 1kHz  
V
= 1V  
RMS  
OUT  
0.0001  
0.0001  
0.0001  
100  
1k  
10k  
100k  
0
0.5  
1
1.5  
2
0
0.5  
1
1.5  
2
INPUT FREQUENCY (Hz)  
OUTPUT VOLTAGE (V  
)
OUTPUT VOLTAGE (V  
)
RMS  
RMS  
4
_______________________________________________________________________________________  
Ult ra -Hig h P S RR S t e re o Drive rs +  
Mic ro p h o n e Am p + 1 0 0 m A Lin e a r Re g u la t o r  
Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )  
(V = SV = +5V, typical operating circuit, T = +25°C, unless otherwise noted.)  
CC  
CC  
A
DRIVER OUT  
CHANNEL SEPARATION  
vs. INPUT FREQUENCY  
DRIVER OUT  
MUTED OUTPUT ATTENUATION  
vs. INPUT FREQUENCY  
DRIVER OUT  
THD+N vs. AMPLITUDE  
-60  
-70  
10  
1
-80  
BW = 22kHz  
-85  
-90  
OUT2 TO OUT1  
B
-80  
f
= 1kHz  
IN  
-95  
C
A
0.1  
0.01  
-90  
-100  
-105  
-110  
-100  
-110  
-120  
OUT1 TO OUT2  
R = 10kΩ  
R = 16Ω  
L
L
0.001  
A = R = 20kΩ, R = 20kΩ  
I
F
A = -1  
V
R = 16Ω  
A = -1  
V
B = R = 10kΩ, R = 10kΩ  
L
-115  
-120  
I
F
V
OUT  
= 1V  
RMS  
C = R = 10kΩ, R = 20kΩ  
I
F
0.0001  
100  
1k  
10k  
100k  
0
0.5  
1
1.5  
2
100  
1k  
10k  
100k  
INPUT FREQUENCY (Hz)  
OUTPUT VOLTAGE (V  
)
INPUT FREQUENCY (Hz)  
RMS  
DRIVER OUT  
POWER-SUPPLY REJECTION  
RATIO vs. FREQUENCY  
DRIVER OUT  
OPEN-LOOP FREQUENCY RESPONSE  
DRIVER OUT  
OPEN-LOOP FREQUENCY RESPONSE  
MAX4298/9-15  
MAX4298/9-14  
90  
200  
180  
160  
140  
120  
100  
80  
90  
200  
180  
160  
140  
120  
100  
80  
-50  
-60  
80  
70  
60  
50  
40  
30  
20  
10  
0
80  
70  
60  
50  
40  
30  
20  
10  
0
-70  
-80  
PHASE  
PHASE  
-90  
-100  
-110  
-120  
-130  
60  
60  
GAIN  
GAIN  
40  
40  
20  
20  
-140  
-150  
32|| 1.5nF  
32|| 15pF  
-10  
0.01  
0
-10  
0.01  
0
0.1  
1
10  
100 1000 10,000  
0.1  
1
10  
100 1000 10,000  
100  
1k  
10k  
100k  
INPUT FREQUENCY (kHz)  
INPUT FREQUENCY (kHz)  
FREQUENCY (Hz)  
DRIVER OUT  
DRIVER OUT  
DRIVER OUT  
OPEN-LOOP FREQUENCY RESPONSE  
OPEN-LOOP FREQUENCY RESPONSE  
OPEN-LOOP FREQUENCY RESPONSE  
MAX4298/9-17  
MAX4298/9-18  
MAX4298/9-16  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
200  
180  
160  
140  
120  
100  
80  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
200  
180  
160  
140  
120  
100  
80  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
200  
180  
160  
140  
120  
100  
80  
PHASE  
PHASE  
PHASE  
60  
60  
60  
GAIN  
GAIN  
GAIN  
40  
40  
40  
20  
20  
20  
10k|| 15pF  
10k|| 1.5nF  
32k|| 22nF  
-10  
0
-10  
0
-10  
0
0.01  
0.1  
1
10  
100 1000 10,000  
0.01  
0.1  
1
10  
100 1000 10,000  
0.01  
0.1  
1
10  
100 1000 10,000  
INPUT FREQUENCY (kHz)  
INPUT FREQUENCY (kHz)  
INPUT FREQUENCY (kHz)  
_______________________________________________________________________________________  
5
Ult ra -Hig h P S RR S t e re o Drive rs +  
Mic ro p h o n e Am p + 1 0 0 m A Lin e a r Re g u la t o r  
Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )  
(V = SV = +5V, typical operating circuit, T = +25°C, unless otherwise noted.)  
CC  
CC  
A
DRIVER OUT  
OPEN-LOOP FREQUENCY RESPONSE  
MICOUT OPEN LOOP  
MICOUT ALL HOSTILE CROSSTLAK  
(INPUT REFERRED)  
FREQUENCY RESPONSE  
MAX4298/99 toc21  
MAX4298/99 toc19  
90  
80  
70  
60  
-20  
-40  
-60  
-80  
200  
180  
160  
140  
120  
100  
80  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
200  
180  
160  
140  
120  
100  
80  
A = -100  
V
50  
40  
PHASE  
PHASE  
30  
20  
60  
60  
GAIN  
GAIN  
40  
40  
-100  
-120  
10  
20  
20  
0
10k|| 22nF  
10k|| 15pF  
0.1  
0
-10  
0.01  
0
-10  
0.01  
1
10  
100 1000 10,000  
0.1  
1
10  
100 1000 10,000  
0.01  
0.1  
1
10  
100  
INPUT FREQUENCY (kHz)  
INPUT FREQUENCY (kHz)  
INPUT FREQUENCY (kHz)  
MICOUT  
THD+N vs. AMPLITUDE  
MICOUT OPEN LOOP  
REGOUT OUTPUT VOLTAGE  
vs. LOAD CURRENT  
FREQUENCY RESPONSE  
MAX4298/99 toc22  
10  
90  
80  
70  
60  
50  
40  
200  
180  
160  
140  
120  
3.5  
3.4  
3.3  
3.2  
3.1  
3.0  
1
0.1  
100  
80  
PHASE  
30  
20  
0.01  
60  
GAIN  
R = 10kΩ  
L
40  
20  
0
10  
A = -1  
0.001  
V
f
IN  
= 1kHz  
0
BW = 22kHz  
10k|| 150pF  
0.0001  
-10  
0.01  
2.0  
0
0.5  
1.0  
1.5  
0.1  
1
10  
100 1000 10,000  
0
20  
40  
60  
80  
100  
AMPLITUDE (V  
)
INPUT FREQUENCY (kHz)  
RMS  
LOAD CURRENT (mA)  
REGOUT TRANSIENT RESPONSE  
REGOUT TRANSIENT RESPONSE  
MAX4298/99 toc25  
MAX4298/99 toc26  
V
OUT  
30mV/div  
V
OUT  
30mV/div  
100mA  
100mA  
I
L
I
L
0
10mA  
200µs/div  
200µs/div  
6
_______________________________________________________________________________________  
Ult ra -Hig h P S RR S t e re o Drive rs +  
Mic ro p h o n e Am p + 1 0 0 m A Lin e a r Re g u la t o r  
P in De s c rip t io n  
PIN  
MAX4299  
20-PIN SO  
MAX4298  
MAX4298  
14-PIN SO  
MAX4299  
NAME  
FUNCTION  
10-PIN  
µMAX  
16-PIN  
TSSOP  
Regulator Output. Bypass REG to GND with a 10µF  
capacitor.  
16  
1
2
REG  
FB  
Regulator Feedback. Internal resistors from this point  
to REG and GND define the regulator output value.  
Adjustments can be made to the output value by  
adding resistors in the same place externally.  
1
4
5
6
7
1
2
2
3
2
3
4
5
OUT1  
PGND  
GND  
IN1  
Driver Amplifier Output  
Power Ground for Driver Outputs  
Ground  
3
4
Inverting Input for Driver Amplifier  
Bias Point for Amplifiers. Bypass BIAS to GND with a  
1µF capacitor.  
4
5
5
6
6
8
BIAS  
Standby Power Supply. Connect to a standby +5V  
supply that is always on, or bypass with 220µF and  
7
9
SV  
CC  
connect a Schottky diode from V to SV . Short to  
CC  
CC  
V
CC  
if clickless power-down is not essential.  
10  
11  
8
9
MICOUT  
MICIN  
Microphone Amplifier Output  
Inverting Input for Microphone Amplifier  
Mute Digital Input. Connect to GND for normal  
operation. When MUTE is connected to V , OUT1  
CC  
and OUT2 are muted, REG stays on, and MICOUT  
stays on.  
6
9
10  
13  
MUTE  
14  
7
8
10  
11  
11  
12  
13  
14  
C
Bypass to GND with a 1µF Capacitor  
Inverting Input for Driver Amplifier  
Driver Amplifier Output  
BYPASS  
IN2  
15  
16  
17  
9
12  
OUT2  
10  
13  
V
CC  
Power Supply. Connect to +5V.  
No Connection. Not internally connected.  
3, 12, 18, 19  
1, 7, 8, 14  
N.C.  
Regulator Control. Connect to V for normal  
CC  
operation. Connect to GND to shut off the regulator.  
15  
20  
REGON  
powe r supply is noisy. The de sign use s innova tive  
design techniques to achieve ultra-high power-supply  
rejection across the audio signal band while, at the  
same time, delivering a high current rail-to-rail output  
drive capability. These devices are designed to drive  
highly capacitive loads that may be encountered when  
d riving long c a b le s to a re mote loa d s uc h a s  
desktop/notebook headphones or speakers. They are  
fully c omp lia nt to PC99 s ta nd a rd s . Fig ure 1 is the  
De t a ile d De s c rip t io n  
The MAX4298/MAX4299 a re a ud io s ys te m ICs d e -  
signed for single +5V applications. The MAX4299 has a  
stereo headphone driver, a microphone amplifier, and  
a 100mA +3.3V linear regulator; the MAX4298 has the  
stereo headphone driver only. The MAX4298/MAX4299  
are designed specifically for harsh digital environments  
where board space is at a premium and the digital  
_______________________________________________________________________________________  
7
Ult ra -Hig h P S RR S t e re o Drive rs +  
Mic ro p h o n e Am p + 1 0 0 m A Lin e a r Re g u la t o r  
V
CC  
V
CC  
+
_
1.233V  
REG  
FB  
SV  
CC  
MAX4298  
SV  
CC  
18.4kΩ  
11kΩ  
REGON  
_
OUT1  
IN1  
+
50kΩ  
BIAS  
IN2  
MUTE  
2.25V  
MAX4299  
+
_
OUT2  
GND  
_
OUT1  
IN1  
+
C
BYPASS  
BIAS  
2.25V  
50kΩ  
+
_
OUT2  
N.C.  
IN2  
Figure 1. MAX4298 Block Diagram  
MUTE  
MAX4298 block diagram and Figure 2 is the MAX4299  
block diagram.  
The amplifiers exhibit better than 115dB of DC power-  
supply rejection and 93dB at 20kHz. The output ampli-  
+
_
MICOUT  
MICIN  
GND  
C
BYPASS  
PGND  
fiers are capable of driving a 1.5V  
signal into 10kΩ  
RMS  
load with 0.0008% distortion. They can also drive 32Ω  
Figure 2. MAX4299 Block Diagram  
he a d p hone s to 1.2V  
with 0.02% d is tortion. At  
RMS  
+3.3V, the linear regulator can output 100mA of current.  
BIAS  
and OUT2 are muted, but remain in a low-impedance  
state to ensure clickless/popless operation.  
The common-mode bias point for the amplifiers is set to  
2.25V by internal circuitry that has two functions. It pro-  
vides a clickless/popless power-up/power-down wave-  
form for the amplifiers. Also, it generates a ground-  
referenced bias voltage with ultra-high power-supply  
rejection ratio (PSRR). BIAS should be bypassed with 1µF  
to GND.The output impedance of the BIAS pin is 50k.  
SV  
CC  
The MAX4298/MAX4299 provide a fully clickless power-  
down sequence. SV can either be connected to a low-  
CC  
c urre nt + 5V p owe r s ourc e or a lte rna tive ly c a n b e  
connected with a reservoir capacitor to ground and a  
Schottky diode to V . A reservoir capacitor of 220µF or  
CC  
Clic kle s s /Pople s s Func tion  
higher provides enough charge for the clickless power-  
down sequence when C  
= 1µF. For larger values of  
BIAS  
The MAX4298/MAX4299 are designed for high-fidelity  
audio performance into AC-coupled loads. Patented  
design techniques achieve a clickless/popless power-up  
sequence, and the use of a low-current standby supply  
C
, increase the reservoir capacitor accordingly.  
BIAS  
Short to V if clickless power-down is not needed.  
CC  
Drive r Am p lifie r  
(SV ) or external Schottky diode/reservoir capacitor  
CC  
The headphone driver amplifier is a class AB amplifier  
designed to drive 16loads. The amplifiers have innov-  
ative architectures for both the input and output stages  
to achieve ultra-high PSRR while maintaining rail-to-rail  
output drive capability. The output stage can drive high  
capacitive loads encountered when driving long cables  
used for desktop speakers or headphones.  
combination allows clickless/popless power-down. A  
clickless/popless mute function is also provided to main-  
tain a low impedance output when the input signal is  
switched off.  
Mute Func tion  
The MAX4298/MAX4299 have a MUTE pin that allows the  
user to mute the outputs of the device. This feature dis-  
connects the input signal from the power amplifiers when  
a logic high is present at the MUTE pin. To ensure proper  
functionality, the MUTE pin should always be tied to either  
Mic ro p h o n e P re a m p lifie r (MAX4 2 9 9 )  
The MAX4299 provides a microphone preamplifier that  
is a low-power version of the audio amplifier. It is intend-  
ed to be used for low-level signal amplification. This  
microphone preamplifier provides rail-to-rail output with  
very high PSRR.  
V
or GND. MUTE only affects the headphone driver  
CC  
outputs. REG, BIAS, and MICOUT are unaffected. OUT1  
8
_______________________________________________________________________________________  
Ult ra -Hig h P S RR S t e re o Drive rs +  
Mic ro p h o n e Am p + 1 0 0 m A Lin e a r Re g u la t o r  
Re g u la t o r (MAX4 2 9 9 )  
La yo u t  
The MAX4299 a ls o ha s a n a d d itiona l 100mA low-  
dropout (LDO) regulator to provide clean analog power  
for other sensitive analog circuitry on the PC board,  
such as a typical PC99 audio codec or microphone  
biasing. It is designed to provide good AC line regula-  
tion. The nominal output voltage of REG is 3.3V, and is  
adjustable between 1.2V and 4.5V by connecting a  
resistor-divider from REG to GND. Connect FB to the  
junction of the resistor-divider. The input impedance at  
FB is typically 7k, which should be considered in out-  
put voltage calculations. REG should be bypassed to  
GND with at least 10µF.  
Good layout improves performance by decreasing the  
amount of stray capacitance and noise at the power  
amplifiers inputs and output. To decrease stray capaci-  
tance, minimize PC board trace lengths and resistor  
leads, and place external components as close to the  
pins as possible.  
P o w e r Dis s ip a t io n  
The first equation below indicates the maximum power  
dissipation point for a package that has two power  
amplifiers operating at identical known supply voltages  
and loads with sine wave inputs:  
P
= (V )2 / (π2R ) [W]  
IC(DISS)  
CC L  
Ap p lic a t io n s In fo rm a t io n  
For example, with a 5V power supply and a load of 16,  
the maximum power dissipation of the amplifiers alone  
is 317mW.  
Ca p a c it o r S e le c t io n a n d  
Re g u la t o r S t a b ilit y  
Normally, use a 10µF capacitor on REG (MAX4299 only)  
The additional power dissipation due to the 100mA reg-  
ula tor op e ra ting a t ma ximum c urre nt is nomina lly  
170mW, but will increase if the output is reduced exter-  
nally from its nominal 3.3V. The regulator power con-  
sumption is given by:  
and a 1µF capacitor on C  
. Larger capacitor val-  
BYPASS  
ues and lower ESRs provide better supply-noise rejec-  
tion and line-transient response. Reduce noise and  
improve load-transient response, stability, and power-  
supply rejection by using larger capacitors. For stable  
operation over the full temperature range and load cur-  
rents up to 100mA, a minimum of 10µF (REG) and 1µF  
P
= (V - V  
) x 100mA [W]  
REG  
CC  
REG  
To avoid thermal shutdown the sum of the regulator and  
amplifier power dissipation must not exceed the absolute  
maximum power-dissipation rating of the package.  
(C  
) is recommended.  
BYPASS  
Use a 1µF bypass capacitor on BIAS to ensure a fully  
clickless/popless power-up sequence. Smaller capacitor  
values may be used here to decrease the power-up  
time, but may cause the power-up transient to become  
audible. Larger bypass capacitors are not necessary to  
reduce noise and/or improve AC power-supply rejection.  
S h o rt -Circ u it P ro t e c t io n a n d  
Th e rm a l S h u t d o w n  
The MAX4298/MAX4299 have short-circuit current pro-  
tection on all outputs. They also have a thermal shut-  
down function designed to protect the chip from junction  
temperatures in excess of +150°C that may arise from  
temporary short circuits or operation beyond the power  
dissipation limit of the package. The driver amplifier out-  
puts limit at around ±220mA, the regulator at 150mA,  
and the microphone amplifier at +1.5mA/-12mA.  
SV is the standby power supply. If using an external  
CC  
diode for charging, a 220µF reservoir capacitor on  
SV  
provides standby power for the clickless power-  
CC  
down sequence. Smaller capacitors here may cause an  
audible output transient on power-down; 220µF or high-  
er provides enough energy when C  
= 1µF. For larg-  
BIAS  
US B Ap p lic a t io n s  
er values of C  
accordingly.  
, increase the reservoir capacitor  
BIAS  
Universal serial bus (USB) interfaces are an increasingly  
popular method of interfacing medium-speed (up to  
12Mbps) PC peripherals. One of the great benefits of  
the USB interface is the inclusion of a +5V supply. While  
this supply works well for a mouse or keyboard, its sus-  
ceptibility for noise pickup can be unsuitable for high-  
fidelity audio applications. The MAX4298/MAX4299s’  
excellent PSRR make them ideal candidates for USB  
applications due to their insensitivity to the supply noise.  
Mic Bia s in g (MAX4 2 9 9 )  
Common microphone elements require resistive biasing  
to power their internal circuitry. A 2kresistor is typical-  
ly us e d , a nd the mic rop hone is AC-c oup le d to the  
microphone amplifier. If the microphone element allows  
low-voltage operation, biasing to the REG output pro-  
vides excellent power-supply rejection.  
Of particular interest is an Internet-Protocol (IP) phone.  
This PC p e rip he ra l us e s the loc a l inte rne t s e rvic e  
provider as a free long-distance phone. The MAX4299,  
with its integral microphone amp, headphone driver,  
and linear regulator, can be a key element in the imple-  
me nta tion of a n IP phone tha t inte rfa c e s to the PC  
through the USB.  
P o w e r S u p p ly a n d Byp a s s in g  
The excellent PSRR of the MAX4298/MAX4299 allows  
them to operate from noisy power supplies. In most  
applications, a 0.1µF capacitor from V to GND is suf-  
CC  
ficient. This bypass capacitor should be placed close  
to the V pin.  
CC  
_______________________________________________________________________________________  
9
Ult ra -Hig h P S RR S t e re o Drive rs +  
Mic ro p h o n e Am p + 1 0 0 m A Lin e a r Re g u la t o r  
Typ ic a l Op e ra t in g Circ u it s  
R
F
10kΩ  
V
CC  
OPTIONAL  
V
CC  
MAX4298  
SV  
CC  
220µF  
R
10kΩ  
I
LEFT  
_
+
OUT1  
IN1  
V
CC  
C
MUTE  
AC  
220µF  
BIAS  
2.25V  
1µF  
RIGHT  
R
I
+
_
OUT2  
GND  
10kΩ  
IN2  
C
AC  
220µF  
C
BYPASS  
1µF  
R
F
10kΩ  
20kΩ  
V
CC  
REGON  
10µF  
OPTIONAL  
AV  
DD  
3.3V  
REG  
FB  
V
CC  
LDO  
SV  
CC  
MAX4299  
220µF  
C
AC  
220µF  
_
+
OUT  
IN1  
LEFT  
V
CC  
AUDIO  
CODEC  
20kΩ  
0.33µF  
MUTE  
BIAS  
2.25V  
1µF  
+
_
AV  
DD  
OUT2  
IN2  
RIGHT  
C
220µF  
AC  
20kΩ  
0.33µF  
MIC  
RBIAS  
+
_
MICOUT  
MICIN  
GND  
ELECTRET  
MIC  
C
BYPASS  
20k0.33µF  
1µF  
PGND  
20kΩ  
200kΩ  
10 ______________________________________________________________________________________  
Ult ra -Hig h P S RR S t e re o Drive rs +  
Mic ro p h o n e Am p + 1 0 0 m A Lin e a r Re g u la t o r  
P in Co n fig u ra t io n s (c o n t in u e d )  
TOP VIEW  
REG  
FB  
1
2
3
4
5
6
7
8
9
20 REGON  
19 N.C.  
FB  
OUT1  
PGND  
GND  
IN1  
1
2
3
4
5
6
7
8
16 REG  
N.C.  
OUT1  
GND  
IN1  
1
2
3
4
5
6
7
14 N.C.  
13  
15 REGON  
V
CC  
N.C.  
18 N.C.  
14  
V
CC  
12 OUT2  
11 IN2  
OUT1  
PGND  
GND  
IN1  
17 V  
CC  
MAX4299  
13 OUT2  
12 IN2  
MAX4298  
MAX4299  
16 OUT2  
15 IN2  
BIAS  
10  
9
C
BYPASS  
BIAS  
11  
10 MUTE  
MICIN  
C
BYPASS  
SV  
CC  
MUTE  
N.C.  
14  
C
SV  
CC  
BYPASS  
N.C.  
8
BIAS  
13 MUTE  
12 N.C.  
MICOUT  
9
SO  
SV  
CC  
TSSOP  
MICOUT 10  
11 MICIN  
WIDE SO  
Ch ip In fo rm a t io n  
MAX4298 TRANSISTOR COUNT: 760  
MAX4299 TRANSISTOR COUNT: 905  
PROCESS: BiCMOS  
P a c k a g e In fo rm a t io n  
______________________________________________________________________________________ 11  
Ult ra -Hig h P S RR S t e re o Drive rs +  
Mic ro p h o n e Am p + 1 0 0 m A Lin e a r Re g u la t o r  
P a c k a g e In fo rm a t io n (c o n t in u e d )  
12 ______________________________________________________________________________________  
Ult ra -Hig h P S RR S t e re o Drive rs +  
Mic ro p h o n e Am p + 1 0 0 m A Lin e a r Re g u la t o r  
P a c k a g e In fo rm a t io n (c o n t in u e d )  
______________________________________________________________________________________ 13  
Ult ra -Hig h P S RR S t e re o Drive rs +  
Mic ro p h o n e Am p + 1 0 0 m A Lin e a r Re g u la t o r  
P a c k a g e In fo rm a t io n (c o n t in u e d )  
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.  
14 ____________________Ma x im In t e g ra t e d P ro d u c t s , 1 2 0 S a n Ga b rie l Drive , S u n n yva le , CA 9 4 0 8 6 4 0 8 -7 3 7 -7 6 0 0  
© 2001 Maxim Integrated Products  
Printed USA  
is a registered trademark of Maxim Integrated Products.  

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