U4083B-G3Y [ATMEL]
Audio Amplifier, 0.4W, 1 Channel(s), 1 Func, PDSO8, LEAD FREE, SO-8;
| 型号： | U4083B-G3Y |
| 厂家： | 
ATMEL |
| 描述： | Audio Amplifier, 0.4W, 1 Channel(s), 1 Func, PDSO8, LEAD FREE, SO-8 放大器 光电二极管 商用集成电路 |
| 文件： | 总15页 (文件大小：508K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Features
• Wide Operating Voltage Range: 2V to 16V
• Low Current Consumption: 2.7 mA Typically
• Chip Disable Input to Power Down the Integrated Circuit
• Low Power-down Quiescent Current
• Drives a Wide Range of Speaker Loads
• Output Power Po = 250 mW at RL = 32Ω (Speaker)
• Low Harmonic Distortion (0.5% Typically)
• Wide Gain Range: 0 dB to 46 dB
Low-power
Benefits
Audio Amplifier
for Telephone
Applications
• Low Number of External Components
• Low Current Consumption
1. Description
The integrated circuit U4083B is a low-power audio amplifier for telephone loudspeak-
ers. It has differential speaker outputs to maximize the output swing at low supply
voltages. There is no need for coupler capacitors. The U4083B has an open-loop gain
of 80 dB where the closed-loop gain is adjusted with two external resistors. A chip dis-
able pin permits powering down and/or muting the input signal.
U4083B
Figure 1-1. Block Diagram
6
VS
4
Vi
5
Amp1
VO1
3
FC3
4k
4k
50k
2
8
Amp2
VO2
CD
125k
FC2
50k
1
U4083B
Bias circuit
7
GND
Rev. 4655B–CORD–10/05
2. Pin Configuration
Figure 2-1. Pinning SO8
1
2
3
4
8
7
6
5
CD
VO2
GND
VS
FC2
FC1
Vi
VO1
Table 2-1.
Pin Description
Pin
1
Symbol
CD
Function
Chip disable
2
FC2
FC1
Vi
Filtering, power supply rejection
Filtering, power supply rejection
Amplifier input
3
4
5
VO1
VS
Amplifier output 1
Voltage supply
6
7
GND
VO2
Ground
8
Amplifier output 2
2
U4083B
4655B–CORD–10/05
U4083B
3. Functional Description Including External Circuitry
3.1
Pin 1: Chip Disable Digital Input (CD)
Pin 1 (chip disable) is used to power down the IC to conserve power or mute the IC or both.
Input impedance at Pin 1 is typically 90 kΩ.
• Logic 0 < 0.8V
• Logic 1 > 2V
IC enabled (normal operation)
IC disabled
Figure 8-15 on page 12 shows the power supply current diagram. The change in differential gain
from normal operation to muted operation (muting) is more than 70 dB.
Switching characteristics are as follows:
• Turn-on time
• Turn-off time
t
t
on = 12 ms to 15 ms
off ≤2 µs
They are independent of C1, C2 and VS.
Voltages at Pins 2 and 3 are supplied from VS and, therefore, do not change when the U4083B
is disabled. The outputs, VO1 (Pin 5) and VO2 (Pin 8), turn to a high impedance condition by
removing the signal from the speaker.
When signals are applied from an external source to the outputs (disabled), they must not
exceed the range between the supply voltage, VS, and ground.
3.2
Pins 2 and 3: Filtering, Power Supply Rejection
Power supply rejection is provided by capacitors C1 and C2 at Pin 3 and Pin 2, respectively. C1 is
dominant at high frequencies whereas C2 is dominant at low frequencies (Figure 8-4 on page 8
to Figure 8-7 on page 9). The values of C1 and C2 depend on the conditions of each application.
For example, a line-powered speakerphone (telephone amplifier) will require more filtering than
a system powered by regulated power supply.
The amount of rejection is a function of the capacitors and the equivalent impedance at Pin 3
and Pin 2 (see electrical characteristic equivalent resistance, R).
Apart from filtering, capacitors C1 and C2 also influence the turn-on time of the circuit at power
up, since the capacitors are charged up through the internal resistors (50 kΩ and 125 kΩ) as
shown in the block diagram.
Figure 8-1 on page 7 shows the turn-on time versus C2 at VS = 6V, for two different C1 values.
The turn-on time is 60% longer when VS = 3V and 20% shorter when VS = 9V.
The turn-off time is less than 10 µs.
3
4655B–CORD–10/05
3.3
Pin 4: Amplifier Input Vi, Pin 5: Amplifier Output 1 VO1, Pin 8: Amplifier Output 2 VO2
There are two identical operational amplifiers. Amplifier 1 has an open-loop gain ≥ 80 dB at
100Hz (Figure 8-2 on page 7), whereas the closed-loop gain is set by external resistors, Rf and
Ri (Figure 8-3 on page 8). The amplifier is unity gain stable, and has a unity gain frequency of
approximately 1.5 MHz. A closed-loop gain of 46 dB is recommended for a frequency range of
300Hz to 3400Hz (voice band). Amplifier 2 is internally set to a gain of –1.0 dB (0 dB). The out-
puts of both amplifiers are capable of sourcing and sinking a peak current of 200 mA. Output
voltage swing is between 0.4V and VS – 1.3V at maximum current (Figure 8-18 on page 13 and
Figure 8-19 on page 13).
The output DC offset voltage between Pins 5 and 8 (VO1 – VO2) is mainly a function of the feed-
back resistor, Rf, because the input offset voltages of the two amplifiers neutralize each other.
Bias current of Amplifier 1 which is constant with respect to Vs, flows out of Pin 4 (Vi) and
through Rf, forcing VO1 to shift negative by an amount equal to RfIIB and VO2 positive to an equal
amount.
The output offset voltage specified in the electrical characteristics is measured with the feedback
resistor (Rf = 75 kΩ) shown in the typical application circuit, Figure 8-20 on page 14. It takes into
account the bias current as well as internal offset voltages of the amplifiers.
3.4
Pin 6: Supply and Power Dissipation
Power dissipation is shown in Figure 8-8 on page 9 to Figure 8-10 on page 10 for different loads.
Distortion characteristics are given in Figure 8-11 on page 10 to Figure 8-13 on page 11.
T
– T
amb
jmax
P
= --------------------------------
totmax
R
thJA
where
T
jmax = Junction temperature = 140°C
amb = Ambient temperature
T
R
thJA = Thermal resistance, junction-ambient
Power dissipated within the IC in a given application is found from the following equation:
2
P
tot = (VS × IS) + (IRMS × VS) – (RL × IRMS
)
IS is obtained from Figure 8-15 on page 12.
RMS is the RMS current at the load RL.
I
The IC's operating range is defined by a peak operating load current of ±200 mA (Figure 8-8 on
page 9 to Figure 8-13 on page 11). It is further specified with respect to different loads (see Fig-
ure 8-14 on page 12). The left (ascending) portion of each of the three curves is defined by the
power level at which 10% distortion occurs. The center flat portion of each curve is defined by
the maximum output current capability of the integrated circuit. The right (descending) portion of
each curve is defined by the maximum internal power dissipation of the IC at 25°C. At higher
ambient temperatures, the maximum load power must be reduced according to the above men-
tioned equation.
4
U4083B
4655B–CORD–10/05
U4083B
3.5
Layout Considerations
Normally, a snubber is not needed at the output of the IC, unlike many other audio amplifiers.
However, the PC-board layout, stray capacitances, and the manner in which the speaker wires
are configured may dictate otherwise. Generally, the speaker wires should be twisted tightly,
and should not be more than a few cm (or inches) in length.
4. Absolute Maximum Ratings
Reference point Pin 7, Tamb = 25° C unless otherwise specified.
Parameters
Symbol
Value
Unit
Supply voltage
Pin 6
VS
–1.0 to +18
V
Voltages
Disabled
Pins 1, 2, 3 and 4
Pins 5 and 8
–1.0 to (VS + 1.0)
–1.0 to (VS + 1.0)
V
V
Output current
Pins 5 and 8
±250
+140
mA
°C
Junction temperature
Storage temperature range
Ambient temperature range
Tj
Tstg
Tamb
Ptot
–55 to +150
–20 to +70
440
°C
°C
Power dissipation SO8: Tamb = 60°C
mW
5. Thermal Resistance
Parameters
Symbol
Value
Unit
Junction ambient
SO8
RthJA
180
K/W
6. Recommended Operating Conditions
Parameters
Symbol
Value
2 to 16
8.0 to 100
±200
Unit
V
Supply voltage
Load impedance
Load current
Pin 6
VS
Pins 5 to 8
RL
Ω
IL
mA
dB
V
Differential gain (5.0 kHz bandwidth)
∆G
0 to 46
VS
Voltage at CD
Pin 1
VCD
Tamb
Ambient temperature range
–20 to +70
°C
5
4655B–CORD–10/05
7. Electrical Characteristics
Tamb = +25° C, reference point pin 7, unless otherwise specified
Parameters
Test Conditions
Symbol
Min.
Typ.
Max.
Unit
Amplifiers (AC Characteristics)
Open-loop gain
(Amplifier 1, f < 100Hz)
GVOL1
80
dB
Closed-loop gain (Amplifier 2)
Gain bandwidth product
VS = 6.0V, f = 1.0 kHz, RL = 32Ω
GV2
–0.35
0
+0.35
dB
GBW
1.5
MHz
VS = 3.0V, RL = 16Ω, d < 10%
VS = 6.0V, RL = 32Ω, d < 10%
VS = 12V, RL = 100Ω, d < 10%
PO
PO
PO
55
250
400
Output power
mW
VS = 6.0V, RL = 32Ω,
Po = 125 mW
VS > 3.0V, RL = 8Ω,
Po = 20 mW
VS > 12V, RL = 32Ω,
Po = 200 mW
d
d
d
0.5
0.5
0.6
Total harmonic distortion
(f = 1.0 kHz)
1.0
%
VS = 6.0V, ∆VS = 3.0V
C1 = α, C2 = 0.01 µF
C1 = 0.1 µF, C2 = 0, f = 1.0 kHz
C1 = 1.0 µF, C2 = 5.0 µF,
f = 1.0 kHz
PSRR
PSRR
dB
Power supply rejection ratio
12
52
50
PSRR
GMUTE
VS = 6.0V, 1.0 kHz < f < 20 kHz,
CD = 2.0V
Muting
>70
dB
V
Amplifiers (DC Characteristics)
Output DC level at VO1
VO2
,
VS = 3.0V, RL = 16Ω
VS = 6.0V
VS = 12V
VO
VO
VO
1.15
2.65
5.65
1.0
1.25
Rf = 75 kW
IO = –75 mA,
2.0V < VS < 16V
Output high level
Output low level
VOH
VOL
VS – 1
0.16
V
V
IO = –75 mA,
2.0V < VS < 16V
Output DC offset voltage
(VO1 – VO2
VS = 6.0V, Rf = 75 kΩ,
RL = 32Ω
)
∆VO
–IIB
R
–30
0
+30
200
220
40
mV
nA
kΩ
kΩ
Input bias current at Vi
VS = 6.0V
VS = 6.0V
VS = 6.0V
100
150
25
Equivalent resistance at Pin 3
Equivalent resistance at Pin 2
100
18
R
Chip disable Pin 1
Input voltage low
Input voltage high
Input resistance
VIL
VIH
RCD
0.8
V
V
kΩ
2.0
50
VS = VCD = 16V
90
65
175
VS = 3.0V, RL = α, CD = 0.8V
VS = 16V, RL = α, CD = 0.8V
VS = 3.0V, RL = α, CD = 2.0V
IS
IS
IS
4.0
5.0
100
mA
mA
µA
Power supply current
6
U4083B
4655B–CORD–10/05
U4083B
8. Typical Temperature Performance
Tamb = –20 to +70°C
Function
Typical Change
Units
Input bias current at Vi
±40
pA/°C
Total harmonic distortion
VS = 6.0V, RL = 32 Ω, Po = 125 mW, f = 1.0 kHz
+0.003
%/°C
Power supply current
VS = 3.0V, RL = α, CD = 0V
VS = 3.0V, RL = α, CD = 2.0V
–2.5
–0.03
µA/°C
µA/°C
Figure 8-1. Turn-on Time versus C1 and C2 at Power On
360
300
240
C1 = 5 µF
180
120
1 µF
VS switching from 0 to +6V
60
0
10
0
2
4
6
8
C2 (µF)
Figure 8-2. Amplifier 1 — Open-loop Gain and Phase
100
99.33
92.67
80
Phase
60
86.00
79.33
40
Gain
20
72.67
66.00
0
1000
0.1
1
10
100
f (kHz)
7
4655B–CORD–10/05
Figure 8-3. Differential Gain versus Frequency
40
Rf = 150 k
Ri = 6 k
32
Rf = 75 k
Ri = 3 k
24
Rf
Ci
Ri
Input
VO1
16
8
0.1 µF
Amp 1
Amp 2
Outputs
VO2
0
100
0
1
10
Frequency (kHz)
Figure 8-4. Power Supply Rejection versus Frequency — C2 = 10 µF
60
C1 > 1 µF
50
C = 0.1 µF
1
40
C = 10 µF
2
30
C1 = 0
20
10
100
0.1
1
10
f (kHz)
Figure 8-5. Power Supply Rejection versus Frequency — C2 = 5 µF
60
C1 > 1 µF
50
C= 0.1 µF
1
40
C2 = 5 µF
30
20
C1= 0
10
100
0.1
1
10
f (kHz)
8
U4083B
4655B–CORD–10/05
U4083B
Figure 8-6. Power Supply Rejection versus Frequency — C2 = 1 µF
60
C1 > 5 µF
50
C1 = 1 µF
40
C2 = 1 µF
C1 = 0.1 µF
30
20
C1 = 0
10
100
0.1
1
10
f (kHz)
Figure 8-7. Power Supply Rejection versus Frequency — C2 = 0
55
C1 > 5 µF
45
35
25
C1 = 1 µF
C2 = 0
C1 = 0.1 µF
15
5
100
0.1
1
10
f (kHz)
Figure 8-8. Device Dissipation — RL = 8Ω
1200
VS = 12 V
1000
RL= 8 Ohm
800
600
400
6 V
3 V
200
0
0
30
60
90
120
150
180
PL (mW)
9
4655B–CORD–10/05
Figure 8-9. Device Dissipation — RL = 16Ω
1200
VS = 16 V
12 V
1000
RL = 16 Ohm
6 V
800
600
400
200
0
3V
400
0
100
200
300
PL (mW)
Figure 8-10. Device Dissipation — RL = 32Ω
1200
VS = 16 V
12 V
1000
800
600
400
RL = 32 Ohm
6 V
200
3V
0
500
600
0
100
200
300
PL (mW)
400
Figure 8-11. Distortion versus Power — f = 1 kHz, Delta – GV = 34 dB
10
8
VS = 3 V
VS = 3V
f = 1 kHz
VS = 6 V
RL = 16 Ohm
RL = 8 Ohm
Delta-GV= 34 dB
6
4
2
0
RL = 32 Ohm
VS = 16V
RL = 32 Ohm
VS = 6 V
VS = 12 V
RL = 16 W
RL = 32 Ohm
400
0
100
200
300
PO (mW)
10
U4083B
4655B–CORD–10/05
U4083B
Figure 8-12. Distortion versus Power — f = 3 kHz, Delta – GV = 34 dB
10
8
VS = 3 V
L = 16 Ohm
VS = 3 V
RL = 8 Ohm
f = 3 kHz
Delta-GV = 34 dB
VS= 6 V
R
RL = 32 Ohm
6
4
2
0
VS = 6 V
RL = 16 Ohm
VS = 16 V
RL = 32 Ohm Limit
VS = 12 V
RL = 32 Ohm
0
100
200
300
400
PO (mW)
Figure 8-13. Distortion versus Power — f = 1 kHz or 3 kHz, Delta – GV = 12 dB
10
8
VS = 3 V
VS = 6 V
RL = 32 W
RL = 16 Ohm
VS = 3 V
f = 1 or 3 kHz
RL = 8 Ohm
Delta-GV = 12 dB
6
4
2
0
VS = 16 V
VS = 6 V
RL = 16 Ohm Limit
VS = 12 V
RL = 32 Ohm Limit
RL = 32 Ohm
0
100
200
PO = ( mW )
300
400
11
4655B–CORD–10/05
Figure 8-14. Maximum Allowable Load Power
600
Tamb = 25°C - Derate at higher temperature
500
400
300
200
RL = 32
16 Ohm
8 Ohm
100
0
20
0
4
8
12
16
VS (V)
Figure 8-15. Power-supply Current
5
RL = ∞
4
CD = 0
3
2
1
0
CD = VS
20
0
4
8
12
16
VS (V)
Figure 8-16. Small Signal Response
20 µs/Div
12
U4083B
4655B–CORD–10/05
U4083B
Figure 8-17. Large Signal Response
20µs/Div
Figure 8-18. VS – VOH versus Load Current
1.3
1.2
1.1
1.0
0.9
0.8
2V<VS <16 V
200
0
40
80
120
IL (mA)
160
Figure 8-19. VOL versus Load Current
2.0
1.6
1.2
VS = 2 V
0.8
0.4
0
VS= 3 V
VS>6 V
200
0
40
80
120
IL(mA)
160
13
4655B–CORD–10/05
Figure 8-20. Application Circuit
10R
R1B
75k
Rf
Ci
6
5
Ri
100nF
VS
C1B
4
3
Vi
Amp1
3k
VO1
0.1µF
C1
4k
FC3
4k
C2
1µF
50k
2
8
Amp2
125k
C2B
R2B
VO2
CD
FC2
5µF
100nF
10R
50k
1
U4083B
Bias circuit
7
GND
9. Ordering Information
Extended Type Number
Package
Remarks
U4083B-MFP
SO8
SO8
Tube
U4083B-MFPG3
U4083B-G3Y
Taped and reeled
Taped and reeled
Taped and reeled
SO8, Pb-free
SO8, Pb-free
U4083B-Y
10. Package Information
Package SO8
Dimensions in mm
5.2
4.8
5.00
4.85
3.7
1.4
0.2
0.25
0.10
0.4
3.8
1.27
6.15
5.85
3.81
8
5
technical drawings
according to DIN
specifications
1
4
14
U4083B
4655B–CORD–10/05
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