TS482
100mW Stereo Headphone Amplifier
■
Operating from Vcc=2V to 5.5V
■
100mW into 16Ω at 5V
■
TS482ID, TS482IDT - SO-8
38mW into 16Ω at 3.3V
■
11.5mW into 16Ω at 2V
■
Switch ON/OFF click reduction circuitry
■
High power supply rejection ratio: 85dB at 5V
■
High signal-to-noise ratio: 110dB(A) at 5V
■
High crosstalk immunity: 100dB (F=1kHz)
■
Rail-to-rail input and output
■
Unity-gain stable
■
Available in SO-8, MiniSO-8 & DFN8
OUT (1)
1
8
VCC
VIN- (1)
2
7
OUT (2)
VIN+ (1)
3
6
VIN- (2)
GND
4
5
VIN+ (2)
TS482IST - MiniSO-8
OUT (1)
1
8
VCC
VIN- (1)
2
7
OUT (2)
VIN+ (1)
3
6
VIN- (2)
GND
4
5
VIN+ (2)
TS482IQT - DFN8
Description
The TS482 is a dual audio power amplifier able to
drive a 16 or 32Ω stereo headset down to low
voltages.
It is delivering up to 100mW per channel (into 16Ω
loads) of continuous average power with 0.1%
THD+N from a 5V power supply.
OUT (1)
1
8
Vcc
VIN - (1)
2
7
OUT (2)
VIN + (1)
3
6
VIN - (2)
GND
4
5
VIN + (2)
Typical application schematic
Rfeed1
The unity gain stable TS482 can be configured by
external gain-setting resistors.
1µF
Vcc
3.9k
RpolVcc
Cs
100k
8
3.9k
2
1
Rin1
3
+
Cb
TS482
+
5
+
7
Rin2 1µF
6
3.9k
4
100k
Rpol
3.9k
+
■
Stereo headphone amplifier
2.2µF
■
Optical storage
■
Computer motherboard
■
PDA, organizers & notebook computers
■
High-end TV, set-top box, DVD players
■
Sound cards
+
Left In
Cin2
220µF
Cout1
Cout2
+
+
2.2µF
+
Right In Cin1
Applications
+
+
RL=32Ohms
RL=32Ohms
220µF
Rfeed2
Order Codes
Part Number
Temperature Range
Package
Packing
SO-8
Tube or Tape & Reel
-40, +85°C
miniSO-8
TS482ID/IDT
TS482IST
TS482IQT
November 2005
DFN8
Tape & Reel
Marking
482I
Rev 2
1/26
www.st.com
26
Absolute Maximum Ratings
1
TS482
Absolute Maximum Ratings
Table 1.
Key parameters and their absolute maximum ratings
Symbol
VCC
Vi
Parameter
Supply voltage (1)
Input Voltage
Value
Unit
6
V
-0.3 to VCC +0.3
V
Toper
Operating Free Air Temperature Range
-40 to + 85
°C
Tstg
Storage Temperature
-65 to +150
°C
150
°C
Tj
Maximum Junction Temperature
Thermal Resistance Junction to Ambient
Rthja
175
215
70
SO8
MiniSO8
DFN8
°C/W
Power Dissipation (2)
Pd
0.71
0.58
1.79
SO-8
MiniSO-8
DFN8
ESD
Human Body Model (pin to pin)
ESD
Latch-up
W
2
kV
Machine Model - 220pF - 240pF (pin to pin)
200
V
Latch-up Immunity (all pins)
200
mA
Lead Temperature (soldering, 10sec)
250
°C
Lead Temperature (soldering, 10sec) for lead-free
260
°C
Output Short-Circuit Duration
see note (3)
1. All voltages values are measured with respect to the ground pin.
2. Pd has been calculated with Tamb = 25°C, Tjunction = 150°C.
3. Attention must be paid to continuous power dissipation. Exposure of the IC to a short circuit on one or two
amplifiers simultaneously can cause excessive heating and the destruction of the device.
Table 2.
Operating conditions
Symbol
Parameter
Value
Unit
VCC
Supply Voltage
2 to 5.5
V
RL
Load Resistor
>= 16
Ω
400
100
pF
G ND to VCC
V
Load Capacitor
CL
Vicm
RL = 16 to 100Ω
RL > 100Ω
Common Mode Input Voltage Range
Thermal Resistance Junction to Ambient
Rthja
SO-8
MiniSO-8
DFN8(1)
1. When mounted on a 4-layer PCB.
2/26
150
190
41
°C/W
TS482
2
Electrical Characteristics
Electrical Characteristics
Table 3.
Electrical characteristics when VCC = +5V, GND = 0V, Tamb = 25°C (unless
otherwise specified)
Symbol
Parameter
ICC
Supply Current
No input signal, no load
VIO
Input Offset Voltage (VICM = V CC/2)
IIB
Input Bias Current (V ICM = VCC/2)
Min.
Typ.
Max.
Unit
5.5
7.2
1
5
mV
200
500
nA
mA
Output Power
PO
THD+N =
THD+N =
THD+N =
THD+N =
0.1% Max, F = 1kHz, RL = 32Ω
1% Max, F = 1kHz, RL = 32Ω
0.1% Max, F = 1kHz, RL = 16Ω
1% Max, F = 1kHz, RL = 16Ω
60
95
65
67.5
100
107
mW
Total Harmonic Distortion + Noise (Av=-1) (1)
THD + N
PSRR
IO
VO
SNR
RL = 32Ω, Pout = 60mW, 20Hz ≤F ≤20kHz
RL = 16Ω, Pout = 90mW, 20Hz ≤F ≤20kHz
Power Supply Rejection Ratio (Av=1), inputs floating
GBP
SR
dB
85
F = 100Hz, Vripple = 100mVpp
Max Output Current
THD +N < 1%, RL = 16Ω connected between out and VCC /2
Output Swing
VOL: R L = 32Ω
VOH: R L = 32Ω
VOL: R L = 16Ω
VOH: R L = 16Ω
106
4.2
95
110
Signal-to-Noise Ratio (Filter Type A, Av=-1)
RL = 32Ω, THD +N < 0.2%, 20Hz ≤F ≤20kHz
mA
120
0.4
4.6
0.55
4.4
4.45
Channel Separation, R L = 32Ω
F = 1kHz
F = 20Hz to 20kHz
Crosstalk
Channel Separation, R L = 16Ω
F = 1kHz
F = 20Hz to 20kHz
CI
%
0.03
0.03
100
80
0.48
V
0.65
dB
dB
100
80
Input Capacitance
1
pF
Gain Bandwidth Product (R L = 32Ω)
1.35
2.2
MHz
Slew Rate, Unity Gain Inverting (R L = 16Ω)
0.45
0.7
V/µs
1. Fig. 68 to 79 show dispersion of these parameters.
3/26
Electrical Characteristics
Table 4.
TS482
Electrical characteristics when VCC = +3.3V, GND = 0V, Tamb = 25°C (unless
otherwise specified) (1)
Symbol
Parameter
ICC
Supply Current
No input signal, no load
VIO
Input Offset Voltage (VICM = V CC/2)
IIB
Input Bias Current (V ICM = VCC/2)
Min.
Typ.
Max.
Unit
5.3
7.2
1
5
mV
200
500
nA
mA
Output Power
PO
THD+N =
THD+N =
THD+N =
THD+N =
0.1% Max, F = 1kHz, RL = 32Ω
1% Max, F = 1kHz, RL = 32Ω
0.1% Max, F = 1kHz, RL = 16Ω
1% Max, F = 1kHz, RL = 16Ω
23
36
27
28
38
42
mW
Total Harmonic Distortion + Noise (Av=-1) (1)
THD + N
PSRR
IO
VO
SNR
RL = 32Ω, Pout = 16mW, 20Hz ≤F ≤20kHz
RL = 16Ω, Pout = 35mW, 20Hz ≤F ≤20kHz
Power Supply Rejection Ratio (Av=1), inputs floating
GBP
SR
Max Output Current
THD +N < 1%, RL = 16Ω connected between out and VCC/2
Output Swing
VOL: R L = 32Ω
VOH: R L = 32Ω
VOL: R L = 16Ω
VOH: R L = 16Ω
64
2.68
0.3
3
0.45
2.85
92
107
2.85
RL = 32Ω, THD +N < 0.2%, 20Hz ≤F ≤20kHz
mA
75
Signal-to-Noise Ratio (Filter Type A, Av=-1)
100
80
0.38
V
0.52
dB
dB
100
80
Input Capacitance
1
pF
Gain Bandwidth Product (R L = 32Ω)
1.2
2
MHz
Slew Rate, Unity Gain Inverting (R L = 16Ω)
0.45
0.7
V/µs
1. Fig. 68 to 79 show dispersion of these parameters.
1. All electrical values are guaranteed with correlation measurements at 2V and 5V.
4/26
dB
80
F = 100Hz, Vripple = 100mVpp
Channel Separation, R L = 32Ω
F = 1kHz
F = 20Hz to 20kHz
Crosstalk
Channel Separation, R L = 16Ω
F = 1kHz
F = 20Hz to 20kHz
CI
%
0.03
0.03
Electrical Characteristics
Table 5.
TS482
Electrical characteristics when VCC = +2.5V, GND = 0V, Tamb = 25°C (unless
otherwise specified) (2)
Symbol
Parameter
ICC
Supply Current
No input signal, no load
VIO
Input Offset Voltage (VICM = VCC/2)
IIB
Input Bias Current (VICM = V CC/2)
Min.
Typ.
Max.
Unit
5.1
7.2
1
5
mV
200
500
nA
mA
Output Power
PO
THD+N
THD+N
THD+N
THD+N
= 0.1% Max, F = 1kHz, RL = 32Ω
= 1% Max, F = 1kHz, RL = 32Ω
= 0.1% Max, F = 1kHz, RL = 16Ω
= 1% Max, F = 1kHz, RL = 16Ω
12.5
17.5
13.5
14.5
20.5
22
mW
Total Harmonic Distortion + Noise (Av=-1) (1)
THD + N
PSRR
IO
VO
SNR
RL = 32Ω, Pout = 10mW, 20Hz ≤F ≤20kHz
RL = 16Ω, Pout = 16mW, 20Hz ≤F ≤20kHz
Power Supply Rejection Ratio (Av=1), inputs floating
GBP
SR
Max Output Current
THD +N < 1%, RL = 16Ω connected between out and V CC/2
Output Swing
VOL: RL = 32Ω
VOH: RL = 32Ω
VOL: RL = 16Ω
VOH: RL = 16Ω
45
1.97
0.25
2.25
0.35
2.15
89
102
2.14
RL = 32Ω, THD +N < 0.2%, 20Hz ≤F ≤20kHz
mA
56
Signal-to-Noise Ratio (Filter Type A, Av=-1)
100
80
0.325
V
0.45
dB
dB
100
80
Input Capacitance
1
pF
Gain Bandwidth Product (RL = 32Ω)
1.2
2
MHz
Slew Rate, Unity Gain Inverting (RL = 16Ω)
0.45
0.7
V/µs
1. Fig. 68 to 79 show dispersion of these parameters.
2. All electrical values are guaranteed with correlation measurements at 2V and 5V.
5/26
dB
75
F = 100Hz, Vripple = 100mVpp
Channel Separation, RL = 32Ω
F = 1kHz
F = 20Hz to 20kHz
Crosstalk
Channel Separation, RL = 16Ω
F = 1kHz
F = 20Hz to 20kHz
CI
%
0.03
0.03
Electrical Characteristics
Table 6.
TS482
Electrical characteristics when VCC = +2V, GND = 0V, Tamb = 25°C (unless
otherwise specified)
Symbol
Parameter
Min.
Typ.
Max.
Unit
ICC
Supply Current
No input signal, no load
5
7.2
VIO
Input Offset Voltage (VICM = V CC/2)
1
5
mV
IIB
Input Bias Current (V ICM = VCC/2)
200
500
nA
mA
Output Power
PO
THD+N =
THD+N =
THD+N =
THD+N =
0.1% Max, F = 1kHz, RL = 32Ω
1% Max, F = 1kHz, RL = 32Ω
0.1% Max, F = 1kHz, RL = 16Ω
1% Max, F = 1kHz, RL = 16Ω
7
9.5
8
9
11.5
13
mW
Total Harmonic Distortion + Noise (Av=-1) (1)
THD + N
PSRR
IO
VO
SNR
RL = 32Ω, Pout = 6.5mW, 20Hz ≤F ≤20kHz
RL = 16Ω, Pout = 8mW, 20Hz ≤F ≤20kHz
Power Supply Rejection Ratio (Av=1), inputs floating
GBP
SR
Max Output Current
THD +N < 1%, RL = 16Ω connected between out and VCC/2
Output Swing
VOL: R L = 32Ω
VOH: R L = 32Ω
VOL: R L = 16Ω
VOH: R L = 16Ω
33
1.53
0.24
1.73
0.33
1.63
88
101
1.67
RL = 32Ω, THD +N < 0.2%, 20Hz ≤F ≤20kHz
mA
41.5
Signal-to-Noise Ratio (Filter Type A, Av=-1)
100
80
0.295
V
0.41
dB
dB
100
80
Input Capacitance
1
pF
Gain Bandwidth Product (R L = 32Ω)
1.2
2
MHz
Slew Rate, Unity Gain Inverting (R L = 16Ω)
0.42
0.65
V/µs
1. Fig. 68 to 79 show dispersion of these parameters.
6/26
dB
75
F = 100Hz, Vripple = 100mVpp
Channel Separation, R L = 32Ω
F = 1kHz
F = 20Hz to 20kHz
Crosstalk
Channel Separation, R L = 16Ω
F = 1kHz
F = 20Hz to 20kHz
CI
%
0.02
0.025
Electrical Characteristics
Table 7.
Components description
Components
Functional Description
Rin
Inverting input resistor which sets the closed loop gain in conjunction with Rfeed. This
resistor also forms a high pass filter with Cin (fc = 1 / (2 x Pi x Rin x Cin))
Cin
Input coupling capacitor which blocks the DC voltage at the amplifier input terminal
Rfeed
Feed back resistor which sets the closed loop gain in conjunction with Rin
Cs
Supply Bypass capacitor which provides power supply filtering
Cb
Bypass capacitor which provides half supply filtering
Cout
Output coupling capacitor which blocks the DC voltage at the load input terminal
This capacitor also forms a high pass filter with RL (fc = 1 / (2 x Pi x RL x Cout))
Rpol
These 2 resistors form a voltage divider which provide a DC biasing voltage (Vcc/2) for
the 2 amplifiers.
Av
7/26
TS482
Closed loop gain = -Rfeed / Rin
Electrical Characteristics
Table 8.
TS482
Index of graphics
Description
Figure
Page
Open loop gain and phase vs. frequency response
Figure 1 to10
Page 9 to10
Phase and Gain Margin vs. Power Supply Voltage
Figure 11 to 20
Page 10 to12
Output power vs. power supply voltage
Figure 21 to 23
Page 12
Output power vs. load resistance
Figure 24 to 27
Page 12 to13
Power dissipation vs. output power
Figure 28 to 31
Page 13 to14
Power derating vs. ambient temperature
Figure 32
Page 14
Current consumption vs. power supply voltage
Figure 33
Page 14
Power supply rejection ratio vs. frequency
Figure 34
Page 14
THD + N vs. output power
Figure 35 to 49
Page 14 to17
THD + N vs. frequency
Figure 50 to 54
Page 17
Signal to noise ratio
Figure 55 to 58
Page 18
Equivalent input noise voltage vs. frequency
Figure 59
Page 18
Output voltage swing vs. power supply
Figure 60
Page 18
Figure 61 to 65
Page 19
Lower cut off frequency vs. output capacitor
Figure 66
Page 19
Lower cut off frequency vs. input capacitor
Figure 67
Page 20
Figure 68 to 79
Page 20 to22
Crosstalk vs. frequency
Typical distribution of TDH + N
8/26
Electrical Characteristics
60
60
0
Gain (dB)
80
20
1
Figure 3.
10
100
Frequency (kHz)
1000
10000
Phase
80
60
40
20
-20
0
-40
0.1
-20
Open loop gain and phase vs.
frequency response
1
Figure 4.
10
100
Frequency (kHz)
1000
10000
Vcc = 5V
RL = 16Ω
Tamb = 25°C
Gain
60
180
80
160
140
Gain
60
Vcc = 2V
RL = 16Ω
Tamb = 25°C
80
60
0
Gain (dB)
Phase
Phase (Deg)
Gain (dB)
20
100
40
20
20
80
60
40
20
-20
0
0
-40
0.1
1
Figure 5.
10
100
Frequency (kHz)
1000
10000
-40
0.1
-20
Open loop gain and phase vs.
frequency response
1
Figure 6.
10
100
Frequency (kHz)
1000
10000
Vcc = 5V
RL = 32Ω
Tamb = 25°C
Gain
60
180
80
160
140
Vcc = 2V
RL = 32Ω
Tamb = 25°C
Gain
60
80
60
0
40
20
-20
Gain (dB)
Phase
Phase (Deg)
Gain (dB)
20
100
40
9/26
1
10
100
Frequency (kHz)
1000
10000
-20
140
20
100
Phase
80
60
0
40
20
-20
0
0
-40
0.1
160
120
120
40
-20
Open loop gain and phase vs.
frequency response
180
80
140
100
Phase
0
40
-20
160
120
120
40
-20
Open loop gain and phase vs.
frequency response
180
80
140
100
20
0
-40
0.1
160
120
0
40
-20
Vcc = 2V
RL = 8Ω
Tamb = 25°C
40
Phase (Deg)
Gain (dB)
60
140
100
Phase
180
Gain
160
120
40
20
80
180
Vcc = 5V
RL = 8Ω
Tamb = 25°C
Gain
Open loop gain and phase vs.
frequency response
Phase (Deg)
80
Figure 2.
Phase (Deg)
Open loop gain and phase vs.
frequency response
-40
0.1
1
10
100
Frequency (kHz)
1000
10000
-20
Phase (Deg)
Figure 1.
TS482
Electrical Characteristics
Open loop gain and phase vs.
frequency response
Figure 8.
Open loop gain and phase vs.
frequency response
180
180
Gain
60
Vcc = 5V
RL = 600Ω
Tamb = 25°C
80
160
140
Vcc = 2V
RL = 600Ω
Tamb = 25°C
Gain
60
Phase
60
0
Gain (dB)
20
80
Phase (Deg)
Gain (dB)
100
40
100
20
80
Phase
60
0
40
20
-20
40
20
-20
0
0
-40
0.1
1
Figure 9.
10
100
1000
Frequency (kHz)
10000
-40
0.1
-20
Open loop gain and phase vs.
frequency response
1
10
100
Frequency (kHz)
1000
10000
Gain
60
Vcc = 5V
RL = 5kΩ
Tamb = 25°C
180
80
160
140
Vcc = 2V
RL = 5kΩ
Tamb = 25°C
Gain
60
120
20
80
Phase
60
0
40
40
20
80
Phase
60
0
40
20
-20
0
-40
0.1
1
Figure 11.
10
100
1000
Frequency (kHz)
10000
-20
0
-40
0.1
10
100
Frequency (kHz)
1000
10000
-20
50
RL=8Ω
Tamb=25°C
RL=8Ω
Tamb=25°C
40
Gain Margin (dB)
40
Phase Margin (Deg)
1
Phase margin vs. power supply voltage Figure 12. Phase margin vs. power supply voltage
50
30
CL= 0 to 500pF
20
10
0
2.0
10/26
140
100
20
-20
160
120
Gain (dB)
100
Phase (Deg)
Gain (dB)
40
-20
Figure 10. Open loop gain and phase vs.
frequency response
180
80
140
120
120
40
160
Phase (Deg)
80
Phase (Deg)
Figure 7.
TS482
30
CL=0 to 500pF
20
10
2.5
3.0
3.5
4.0
Power Supply Voltage (V)
4.5
5.0
0
2.0
2.5
3.0
3.5
4.0
Power Supply Voltage (V)
4.5
5.0
Electrical Characteristics
TS482
Figure 13. Phase margin vs. power supply voltage Figure 14. Gain margin vs. power supply voltage
50
50
RL=16Ω
Tamb=25°C
40
30
Gain Margin (dB)
Phase Margin (Deg)
40
CL= 0 to 500pF
20
10
30
20
CL=0 to 500pF
10
RL=16Ω
Tamb=25°C
0
2.0
2.5
3.0
3.5
4.0
Power Supply Voltage (V)
4.5
0
2.0
5.0
2.5
3.0
3.5
4.0
Power Supply Voltage (V)
4.5
5.0
Figure 15. Phase margin vs. power supply voltage Figure 16. Gain margin vs. power supply voltage
50
50
RL=32Ω
Tamb=25°C
40
CL= 0 to 500pF
Gain Margin (dB)
Phase Margin (Deg)
40
30
20
10
30
20
CL=0 to 500pF
10
RL=32Ω
Tamb=25°C
0
2.0
2.5
3.0
3.5
4.0
Power Supply Voltage (V)
4.5
0
2.0
5.0
2.5
3.0
3.5
4.0
Power Supply Voltage (V)
4.5
5.0
Figure 17. Phase margin vs. power supply voltage Figure 18. Gain margin vs. power supply voltage
70
20
CL=0pF
50
CL=0pF
CL=500pF
40
30
20
10
CL=100pF
CL=200pF
10
CL=500pF
RL=600Ω
Tamb=25°C
0
2.0
11/26
Gain Margin (dB)
Phase Margin (Deg)
60
2.5
RL=600Ω
Tamb=25°C
3.0
3.5
4.0
Power Supply Voltage (V)
4.5
5.0
0
2.0
2.5
3.0
3.5
4.0
Power Supply Voltage (V)
4.5
5.0
Electrical Characteristics
Figure 19.
TS482
Phase margin vs. power supply voltage Figure 20. Gain margin vs. power supply voltage
70
20
CL=0pF
50
CL=0pF
40
CL=300pF
Gain Margin (dB)
Phase Margin (Deg)
60
CL=500pF
30
20
10
CL=200pF
10
CL=500pF
RL=5kΩ
Tamb=25°C
RL=5kΩ
Tamb=25°C
0
2.0
2.5
Figure 21.
3.0
3.5
4.0
Power Supply Voltage (V)
4.5
0
2.0
5.0
2.5
Output power vs. power supply voltage Figure 22.
3.0
3.5
4.0
Power Supply Voltage (V)
4.5
5.0
Output power vs. power supply voltage
200
250
Av = -1
RL = 8Ω
F = 1kHz
BW < 125kHz
Tamb = 25°C
200
175
Av = -1
RL = 16Ω
F = 1kHz
BW < 125kHz
Tamb = 25°C
175
THD+N=1%
150
150
Output power (mW)
225
Output power (mW)
CL=100pF
THD+N=10%
125
100
75
50
125
THD+N=1%
THD+N=10%
100
75
50
THD+N=0.1%
THD+N=0.1%
25
25
0
2.0
Figure 23.
2.5
3.0
3.5
4.0
Vcc (V)
4.5
5.0
0
2.0
5.5
2.5
3.0
3.5
4.0
Vcc (V)
4.5
5.0
5.5
Output power vs. power supply voltage Figure 24. Output power vs. load resistance
200
75
Av = -1
Vcc = 5V
F = 1kHz
BW < 125kHz
Tamb = 25°C
180
THD+N=1%
THD+N=10%
50
25
THD+N=1%
160
Output power (mW)
Output power (mW)
100
Av = -1
RL = 32Ω
F = 1kHz
BW < 125kHz
Tamb = 25°C
THD+N=0.1%
140
120
100
THD+N=10%
80
60
40
THD+N=0.1%
20
0
2.0
12/26
2.5
3.0
3.5
4.0
Vcc (V)
4.5
5.0
5.5
0
8
16
24
32
40
48
Load Resistance ( )
56
64
Electrical Characteristics
TS482
Figure 25. Output power vs. load resistance
Figure 26. Output power vs. load resistance
50
THD+N=1%
60
Output power (mW)
Av = -1
Vcc = 3.3V
F = 1kHz
BW < 125kHz
Tamb = 25°C
50
40
THD+N=10%
30
20
0
40
30
25
THD+N=10%
20
15
THD+N=0.1%
5
8
16
24
32
40
48
Load Resistance (ohm)
56
0
64
Figure 27. Output power vs. load resistance
20
THD+N=1%
15
THD+N=10%
10
Power Dissipation (mW)
Av = -1
Vcc = 2V
F = 1kHz
BW < 125kHz
Tamb = 25°C
8
16
24
32
40
48
Load Resistance (ohm)
56
64
Figure 28. Power dissipation vs. output power
25
Output power (mW)
THD+N=1%
35
10
THD+N=0.1%
10
Av = -1
Vcc = 2.6V
F = 1kHz
BW < 125kHz
Tamb = 25°C
45
Output power (mW)
70
160 Vcc=5V
F=1kHz
140 THD+N
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