STMICROELECTRONICS TS4604

TS4604
Stereo headset driver and analog audio line driver with
integrated reference to ground
Features
■
Operating from VCC = 3 V up to 4.8 V single
supply operation
■
Line driver stereo differential inputs
■
External gain setting resistors
■
Space-saving package: TSSOP28 pitch
0.65 mm
■
Dedicated shutdown control per function
■
100 mW headset drive into a 16 Ω load
■
90 dB high PSRR on headset drive
■
Two internal negative supplies to ensure
ground-referenced, headset and line driver
capless outputs
■
Internal undervoltage mute
■
■
Pin connections (top view)
Line driver 2 Vrms typ. Output voltage across
entire supply voltage range
Pop-&-click reduction circuitry, thermal
shutdown and output short-circuit protection
Applications
■
PDP/LCD TV
■
Set-top boxes
TSSOP28
+LDL
1
28
+LDR
-LDL
2
27
-LDR
OUTLDL
3
26
OUTLDR
AGND
4
25
EUVP
ENLD
5
24
PGND
PVSSLD
6
23
PVCCLD
CNLD
7
22
CPLD
CNHP
8
21
CPHP
PVSSHP
9
20
PVCCHP
ENHP
10
19
PGND
AGND
11
18
NC
OUTHPL
12
17
OUTHPR
-HPL
13
16
-HPR
+HPL
14
15
+HPR
Description
The TS4604 is a stereo ground-referenced output
analog line driver and stereo headset driver
whose design allows the output DC-blocking
capacitors to be removed, thus reducing
component count. The TS4604 drives 2 Vrms into
a 5 kΩ load or more. The device has differential
inputs and uses external gain setting resistors.
The TS4604 delivers up to 100 mW per channel
into a 16 Ω load. All outputs of the TS4604 include
±8 kV human body model ESD protection cells.
October 2010
Doc ID 17913 Rev 1
1/31
www.st.com
31
Contents
TS4604
Contents
1
Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 3
2
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4
Characteristics of the line driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5
Characteristics of the headset driver . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7
6.1
General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.2
Use of ceramic capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.3
Flying and tank capacitor for the internal negative supply . . . . . . . . . . . . 18
6.4
Power supply decoupling capacitor (Cs) . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.5
Input coupling capacitor (Cin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.6
Range of the gain setting resistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.7
Performance of CMRR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.8
Internal and external undervoltage detection . . . . . . . . . . . . . . . . . . . . . . 21
6.8.1
Internal UVLO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.8.2
External UVLO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.9
2nd order Butterworth low-pass filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.10
ESD protection and compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.11
Pop-&-click circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.12
Start-up phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.13
Layout recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.1
TSSOP28 package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
8
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
9
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2/31
Doc ID 17913 Rev 1
TS4604
1
Absolute maximum ratings and operating conditions
Absolute maximum ratings and operating conditions
Table 1.
Absolute maximum ratings (AMR)
Symbol
VCC
Parameter
Value
Unit
5.5
V
GND to VCC
V
Supply voltage (1)
(2)
Vin
Input voltage enable & standby pin
Vin
Input signal voltage
-2.5 to +2.5
V
Toper
Operating free-air temperature range
-40 to + 85
°C
Tstg
Storage temperature
-65 to +150
°C
150
°C
200
°C/W
Tj
Rthja
Pd
Maximum junction temperature
Thermal resistance junction to ambient
(3)
Internally limited(4)
Power dissipation
Human body model for all pins except outputs
Human body model for all output pins
ESD
Latch-up
2
8
kV
Machine model
200
V
Charge device model
1500
V
Latch-up immunity
200
mA
Lead temperature (soldering, 10sec)
260
°C
1. All voltage values are measured with respect to the ground pin.
2. The magnitude of the input signal must never exceed VCC + 0.3 V/GND - 0.3 V.
3. The device is protected from overheating by a thermal shutdown mechanism active at 150° C.
4. Exceeding the power derating curves during a long period provokes abnormal operating conditions.
Table 2.
Operating conditions
Symbol
Parameter
VCC
Supply voltage
Vicm
Common-mode input voltage range
RLD
Line drive load resistor
RHD
Headset drive load resistor
Rthja
Thermal resistance junction-to-ambient (1)
Value
Unit
3 to 4.8
V
From -1.4 to 1.4
V
≥5
kΩ
≥ 16
Ω
80
°C/W
2
1. With heatsink surface = 125 mm .
Doc ID 17913 Rev 1
3/31
Typical application
TS4604
2
Typical application
Figure 1.
Simplified application schematics in differential configuration setting
R2
R1
2.2 µF
2.2 µF
-LDR
OUTLDR
+LDR
>5 KΩ
R1
R2
R2
R1
2.2 µF
2.2 µF
-LDL
OUTLDL
+LDL
>5 KΩ
R1
R2
TS4604
R2
R1
2.2 µF
-HPR
OUTHPR
2.2 µF
+HPR
1 6 /3 2 Ω
R1
R2
R2
R1
2.2 µF
-HPL
OUTHPL
2.2 µF
+HPL
1 6 /3 2 Ω
R1
R2
AGND
Thermal shutdown
UVLO
AGND
ENHP
ENLD
PVCCHP
3 to 4.8 V
1 µF
Negative
charged pump
line driver
1 µF
1 µF
PGND
PVSSLD
PVSSHP
CPHP
R1= 10 kΩ, R2 = Av x R1
with R2 ≤ 100 k
3 to 4.8 V
PVCCLD
Negative
charged pump
headset
1 µF
PGND
EUVP
Power
management
CNHP
1 µF
CPLD
CNLD
1 µF
AM06138
4/31
Doc ID 17913 Rev 1
TS4604
Table 3.
Typical application
Pin descriptions
Pin number
I/O(1)
Pin name
1
I
+LDL
Left line driver positive input channel
2
I
-LDL
Left line driver negative input channel
3
O
OUTLDL
4
P
AGND
Analog line driver power ground
5
I
ENLD
Line driver enable input pin (active high)
6
O
PVSSLD
7
I/O
CNLD
Line driver charge pump flying capacitor negative terminal
8
I/O
CNHP
Headset charge pump flying capacitor negative terminal
9
I/O
PVSSHP
10
I
ENHP
Headset driver enable input pin (active high)
11
P
AGND
Headphone analog input power ground
12
O
OUTHPL
13
I
-HPL
Left headset driver negative input channel
14
I
+HPL
Left headset driver positive input channel
15
I
+HPR
Right headset driver positive input channel
16
I
-HPR
Right headset driver negative input channel
17
O
OUTHPR
18
NC
Pin description
Left line driver output channel
Output from line drive charge pump
Output from headset drive charge pump
Left headset driver output channel
Right headset driver output channel
Not connected
19
P
PGND
Headset driver power ground
20
P
PVCCHP
21
I/O
CPHP
Headset charge pump flying capacitor positive terminal
22
I/O
CPLD
Line driver charge pump flying capacitor positive terminal
23
P
PVCCLD
24
P
PGND
Line driver power ground
25
I
EUVP
External undervoltage protection input pin
26
O
OUTLDR
27
I
-LDR
Right line driver negative input channel
28
I
+LDR
Right line driver positive input channel
Headset driver power supply voltage(2)
Line driver power supply voltage(2)
Right line driver output channel
1. I = input, O = output, P = power
2. PVccHP and PVccLD are internally connected, so PVccHP must be equal to PVccLD.
Doc ID 17913 Rev 1
5/31
Electrical characteristics
TS4604
3
Electrical characteristics
Table 4.
Common part: VCC = +3.3 V, GND = 0 V, CPhp = CPld = 1 µF, Tamb = 25°C
(unless otherwise specified)
Symbol
Parameters and test conditions
Min.
Typ.
Max.
Unit
VIL
VENHP and VENLD Input voltage low
38
40
43
% Vcc
VIH
VENHP and VENLD Input voltage high
57
60
66
% Vcc
IIH
High level input current (ENHP and ENLD)
-1
1
µA
IIL
Low level input current (ENHP and ENLD)
-1
1
µA
Fosc
Internal negative voltage switching frequency, all temperature
range
400
550
800
kHz
Vup
External undervoltage detection threshold
1.15
1.25
1.35
V
Ihyst
External undervoltage detection hysteresis current
Vhyst
Vuvl
Av
6/31
5
µA
Pvcc_HP/LD Internal undervoltage detection hysteresis
200
mV
Pvcc_HP/LD internal undervoltage detection
– power up
– power down
2.8
2.6
V
Overall external gain (R2 ≤100 kΩ, R1 = R2/Av)
Doc ID 17913 Rev 1
0
1
20
10
dB
V/V
TS4604
Table 5.
Electrical characteristics
Headset driver part: VCC = +3.3 V, GND = 0 V,
ENHP = VCC, ENLD = GND, CPhp = CPld = 1 µF, Av = 1 (R1 = R2 = 10 kΩ),
Tamb = 25°C (unless otherwise specified)
Symbol
Icc
IENHP
Parameters and test conditions
Min.
Typ.
Max.
Unit
Supply current (no input signal, no load)
5
6.5
mA
Headset overall standby current (no input signal):
VENHP = GND
VENHP = 38% VCC
1
5
100
µA
7
mV
Vio
Input offset voltage
-7
0
Po
Headphone output power:
THD + N = 1% max, f = 1 kHz, BW = 22 kHz, RL = 16 Ω
45
65
mW
Po
Headphone output power:
THD + N = 1% max, f = 1 kHz, BW = 22 kHz, RL = 32 Ω
30
45
mW
0.05
%
Headphone power supply rejection ratio with AC inputs
grounded: f = 217 Hz,Vripple = 200 mVpp
90
dB
Total wake-up time
30
ms
tSTBY
Standby time
20
µs
Xtalk
Crosstalk headphone to line:
Pout = 50 mW, RL = 16 Ω, f = 20 Hz to 20 kHz
-100
dB
SNR
Signal-to-noise ratio (A-weighting): RL = 16 Ω, Po = 60 mW
102
dB
Common-mode rejection ratio:
f = 20 Hz to 20 kHz, Vic = 200 mVpp
-70
dB
Output voltage noise: f = 20 Hz to 20 kHz, A-weighted
7.6
µVRMS
THD + N
PSRR
tWU
CMRR
VN
CL(1)
Total harmonic distortion + noise:
RL = 16 Ω, Po = 60 mW, f = 20 Hz to 20 kHz, BW = 22 kHz
Capacitive load:
RL = 16 Ω to 100 Ω
RL > 100 Ω
400
100
pF
1. Higher capacitive loads are possible by adding a serial resistor of 47 Ω in the line driver output.
Doc ID 17913 Rev 1
7/31
Electrical characteristics
Table 6.
Line driver part: VCC = +3.3 V, GND = 0 V, Av = 1 (R1 = R2 = 10 kΩ), ENLD = VCC,
ENHP = GND, CPhp = CPld = 1 µF, RL = 10 kΩ,
Tamb = 25°C (unless otherwise specified)
Symbol
Icc
IENLD
Vio
TS4604
Parameters and test conditions
Min.
Supply current (no input signal, no load)
Typ.
Max.
Unit
5
6.5
mA
5
100
µA
+7
mV
Line drive standby current (no input signal)
VENLD = GND
VENLD = 38% VCC
Input offset voltage
-7
0
Output voltage swing:
RL = 10 kΩ, CL= 100 pF, THD+N = 0.1%
2.1
Vrms
Line driver power supply rejection ratio with AC inputs
grounded: f = 217 Hz, Vripple = 200 mVpp
90
dB
Wake-up time from shutdown
30
ms
tSTBY
Standby time
20
µs
SNR
Signal-to-noise ratio (A-weighting): Vin = 1.7 Vrms
102
dB
Output voltage noise: f = 20 Hz to 20 kHz, A-weighted
8
µVRMS
Gain bandwidth product
1
MHz
0.5
V / µs
0.001
%
VSWING
PSRR
tWU
VN
GBw
Sr
Slew rate
THD+N
BW = 22 kHz, RL = 10 kΩ, VO = 1.5 Vrms, Av = 1,
f = 20 Hz to 20 kHz
CMRR
f = 20 Hz to 20 kHz, Vic = 200 mVpp
-70
dB
Xtalk
Crosstalk channel:
f = 20 Hz to 20 kHz, Vo = 1.5 Vrms, RL = 5 kΩ
-120
dB
CL(1)
Capacitive load: RL > 5 kΩ
400
1. Higher capacitive loads are possible by adding a serial resistor of 47 Ω in the line driver output.
8/31
Doc ID 17913 Rev 1
pF
TS4604
Characteristics of the line driver
4
Characteristics of the line driver
Figure 2.
Current consumption vs. power
supply
Figure 3.
5.7
Output voltage vs. power supply
2.4
Quiescent supply current Icc (mA)
5.6
5.5
2.3
5.3
5.2
5.1
5.0
4.9
4.8
4.7
No Load; No input signal
Line Driver
Ta=25°C
4.6
4.5
Output Voltage (Vrms)
5.4
THD+N=1%
2.2
2.1
THD+N=0.1%
4.4
3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8
1.9
3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8
Power Supply Voltage Vcc (V)
Figure 4.
Power Supply Voltage Vcc (V)
THD+N vs. output power (G=0 dB)
Figure 5.
THD+N vs. output power (G=20 dB)
10
10
RL = 5kΩ to 10kΩ
Vcc = 3.3V to 4.8V, G = 0dB
Inputs = 0° & 180°
BW < 30kHz, Tamb = 25°C
0.1
F=8kHz
F=1kHz
0.01
RL = 5kΩ to 10kΩ
Vcc = 3.3V to 4.8V, G = 20dB
Inputs = 0° & 180°
BW < 30kHz, Tamb = 25°C
1
THD+N (%)
1
THD+N (%)
RL ≥ 5kΩ, F=1kHz
BW<30kHz, Ta=25 C
Line Driver
2.0
0.1
F=8kHz
0.01
1E-3
F=80Hz
1E-4
10
Figure 6.
F=1kHz
1E-3
100
1000
Output Voltage (mVrms)
THD+N vs. frequency (G=0 dB)
Figure 7.
1
RL = 5kΩ to 10kΩ
Vcc = 3.3V to 4.8V
G = 20dB, Inputs = 0° & 180°
Bw < 20kHz, Tamb = 25°C
THD + N (%)
THD + N (%)
THD+N vs. frequency (G=20 dB)
1
RL = 5kΩ to 10kΩ
Vcc = 3.3V to 4.8V
G = 0dB, Inputs = 0° & 180°
Bw < 20kHz, Tamb = 25°C
0.1
Vo=2Vrms
0.01
0.1
Vo=2Vrms
0.01
1E-3
1E-4
F=80Hz
100
1000
Output Voltage (mVrms)
Vo=1.5Vrms
Vo=1.5Vrms
20
100
1000
Frequency (Hz)
10000 20k
1E-3
20
Doc ID 17913 Rev 1
100
1000
Frequency (Hz)
10000 20k
9/31
Characteristics of the line driver
Figure 8.
TS4604
CMRR vs. frequency
Figure 9.
0
CMRR (dB)
-20
PSRR (dB)
-10
ΔVic = 200mVpp
Vcc = 3.3V
RL ≥ 5kΩ
Tamb = 25°C
-30
-40
G=20dB
-50
-60
G=0dB
-70
-80
20
100
1000
Frequency (Hz)
10000 20k
Figure 10. Crosstalk vs. frequency
left to right & right to left channel
Vcc = 3.3V
Vout = 2Vrms
Right to Left & Left to Right
RL ≥ 5kΩ
Tamb = 25°C
G=20dB
1000
Frequency (Hz)
100
1000
Frequency (Hz)
10000 20k
Vcc = 3.3V, G=0dB
RL = 16Ω on HP
Po = 50 mW on HP
LD inputs grounded
Tamb = 25°C
HP to Line Left
HP to Line Right
100
1000
Frequency (Hz)
10000 20k
Figure 13. Frequency response
10
Vcc = 3.3V, G=0dB
RL=10kΩ
Tamb = 25°C
0
-10
-20
Gain (dB)
Output Signal (dBV)
10/31
G=0dB
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
20
10000 20k
Figure 12. Output signal spectrum
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
G=20dB
Figure 11. Crosstalk vs. frequency
headset to line driver
G=0dB
100
Vripple = 200mVpp
Vcc = 3.3V
Inputs = grounded
RL ≥ 5kΩ
Tamb = 25°C
Crosstalk (dB)
Crosstalk (dB)
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
20
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
20
PSRR vs. frequency
-30
-40
-50
-60
-70
100
1000
Frequency (Hz)
10000
Vcc = 3.3V, G=0dB
No load
Tamb = 25°C
-80
1000
Doc ID 17913 Rev 1
10000
100000
1000000
Frequency (Hz)
1E7
TS4604
5
Characteristics of the headset driver
Characteristics of the headset driver
Figure 14. Current consumption vs. power
supply
Figure 15. Standby current vs. power supply
1200
5.7
5.5
1000
Standby current Istby (nA)
Quiescent supply current Icc (mA)
5.6
5.4
5.3
5.2
5.1
5.0
4.9
4.8
4.7
No Load; No input signal
Headset Driver
Ta=25°C
4.6
4.5
800
600
400
4.4
3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8
0
3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8
Power Supply Voltage Vcc (V)
Power Supply Voltage Vcc (V)
Figure 16. Output power vs. power supply
(RL = 16 Ω, G = 0 dB)
Figure 17. Output power vs. power supply
(RL = 16 Ω, G = 20 dB)
180
160
180
160
THD+N=10% (180°)
140
THD+N=10% (0°)
120
100
80
40
20
THD+N=1% (180°)
THD+N=1% (0°)
RL = 16Ω, F=1kHz
G=0dB
BW<30kHz, Ta=25 C
Headset Driver
0
3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8
Power Output (mW)
Power Output (mW)
140
60
No Load; No input signal
Line Driver
Ta=25°C
200
THD+N=10% (180°)
THD+N=10% (0°)
120
100
80
THD+N=1% (180°)
60
40
20
THD+N=1% (0°)
RL = 16Ω, F=1kHz
G=20dB
BW<30kHz, Ta=25 C
Headset Driver
0
3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8
Power Supply Voltage Vcc (V)
Power Supply Voltage Vcc (V)
Doc ID 17913 Rev 1
11/31
Characteristics of the headset driver
TS4604
Figure 18. Output power vs. power supply
(RL = 32 Ω, G = 0 dB)
Figure 19. Output power vs. power supply
(RL = 32 Ω, G = 20 dB)
180
180
RL = 32Ω, F=1kHz
G=0dB, 0° & 180°
BW<30kHz, Ta=25 C
Headset Driver
160
120
140
Power Output (mW)
Power Output (mW)
140
THD+N=10%
100
80
60
40
120
THD+N=10%
100
80
60
40
THD+N=1%
20
RL = 32Ω, F=1kHz
G=20dB, 0° & 180°
BW<30kHz, Ta=25 C
Headset Driver
160
THD+N=1%
20
0
3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8
0
3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8
Power Supply Voltage Vcc (V)
Power Supply Voltage Vcc (V)
Figure 20. THD+N vs. output power
(RL = 16 Ω, G = 20 dB, VCC = 3.0 V
inputs in-phase)
Figure 21. THD+N vs. output power
(RL = 16 Ω, G = 0 dB, VCC = 3.0 V
inputs in-phase)
10
0.1
1
THD+N (%)
THD+N (%)
1
10
RL = 16Ω
Vcc = 3.0V, G = 20dB
Inputs = 0°
BW < 30kHz, Tamb = 25°C
F=8kHz
RL = 16Ω
Vcc = 3.0V, G = 0dB
Inputs = 0°
BW < 30kHz, Tamb = 25°C
0.1
F=8kHz
F=1kHz
0.01
F=1kHz
0.01
F=80Hz
F=80Hz
1E-3
0.1
1
10
Output Power (mW)
100
Figure 22. THD+N vs. output power
(RL = 16 Ω, G = 0 dB, VCC = 3.3 V
inputs out-of-phase)
1E-3
0.1
100
10
RL = 16Ω
Vcc = 3.0V, G = 0dB
Inputs = 180°
BW < 30kHz, Tamb = 25°C
1
THD+N (%)
THD+N (%)
10
Output Power (mW)
Figure 23. THD+N vs. output power
(RL = 16 Ω, G = 20 dB, VCC = 3.3 V
inputs in-phase)
10
1
1
0.1
RL = 16Ω
Vcc = 3.3V, G = 20dB
Inputs = 0°
BW < 30kHz, Tamb = 25°C
0.1
F=8kHz
F=8kHz
F=1kHz
0.01
0.01
F=1kHz
F=80Hz
F=80Hz
1E-3
0.1
12/31
1
10
Output Power (mW)
100
1E-3
0.1
Doc ID 17913 Rev 1
1
10
Output Power (mW)
100
TS4604
Figure 24.
Characteristics of the headset driver
THD+N vs. output power
(RL = 16 Ω, G = 0 dB, VCC = 3.3 V
inputs in-phase)
Figure 25.
10
10
RL = 16Ω
Vcc = 3.3V, G = 0dB
Inputs = 0°
BW < 30kHz, Tamb = 25°C
1
THD+N (%)
THD+N (%)
1
THD+N vs. output power
(RL = 16 Ω, G = 0 dB, VCC = 3.3 V, inputs
out-of-phase)
0.1
RL = 16Ω
Vcc = 3.3V, G = 0dB
Inputs = 180°
BW < 30kHz, Tamb = 25°C
0.1
F=8kHz
F=8kHz
F=1kHz
0.01
0.01
F=1kHz
F=80Hz
1E-3
0.1
Figure 26.
1
F=80Hz
10
Output Power (mW)
100
THD+N vs. output power
(RL = 16 Ω, G = 20 dB, VCC = 4.8 V,
inputs in-phase)
1E-3
0.1
Figure 27.
10
10
Output Power (mW)
100
THD+N vs. output power
(RL = 16 Ω, G = 0 dB, VCC = 4.8 V
inputs in-phase)
10
RL = 16Ω
Vcc = 4.8V, G = 20dB
Inputs = 0°
BW < 30kHz, Tamb = 25°C
0.1
1
THD+N (%)
THD+N (%)
1
1
F=8kHz
RL = 16Ω
Vcc = 4.8V, G = 0dB
Inputs = 0°
BW < 30kHz, Tamb = 25°C
0.1
F=8kHz
0.01
0.01
1E-3
F=1kHz
F=80Hz
F=80Hz
F=1kHz
1E-3
0.1
1
10
Output Power (mW)
100
Figure 28. THD+N vs. output power
(RL = 16 Ω, G = 0 dB, VCC = 4.8 V
inputs out-of-phase)
1E-4
0.1
100
10
RL = 16Ω
Vcc = 4.8V, G = 0dB
Inputs = 180°
BW < 30kHz, Tamb = 25°C
1
THD+N (%)
THD+N (%)
10
Output Power (mW)
Figure 29. THD+N vs. output power
(RL = 32 Ω, VCC = 3.0 V, G = 0 dB)
10
1
1
0.1
RL = 32Ω
Vcc = 3.0V, G = 0dB
Inputs = 0° & 180°
BW < 30kHz, Tamb = 25°C
0.1
F=8kHz
0.01
F=8kHz
F=1kHz
0.01
1E-3
F=1kHz
F=80Hz
F=80Hz
1E-3
0.1
1
10
Output Power (mW)
100
1E-4
0.1
Doc ID 17913 Rev 1
1
10
Output Power (mW)
100
13/31
Characteristics of the headset driver
TS4604
Figure 30. THD+N vs. output power
(RL = 32 Ω, VCC = 3.0 V, G = 20 dB)
Figure 31. THD+N vs. output power
(RL = 32 Ω, VCC = 3.3 V, G = 0 dB)
10
10
RL = 32Ω
Vcc = 3.3V, G = 0dB
Inputs = 0° & 180°
BW < 30kHz, Tamb = 25°C
1
THD+N (%)
THD+N (%)
1
RL = 32Ω
Vcc = 3.0V, G = 20dB
Inputs = 0° & 180°
BW < 30kHz, Tamb = 25°C
0.1
F=8kHz
0.1
F=8kHz
0.01
F=1kHz
F=1kHz
0.01
1E-3
F=80Hz
1E-3
0.1
1
10
Output Power (mW)
F=80Hz
100
Figure 32. THD+N vs. output power
(RL = 32 Ω, VCC = 3.3 V, G = 20 dB)
1E-4
0.1
100
10
RL = 32Ω
Vcc = 3.3V, G = 20dB
Inputs = 0° & 180°
BW < 30kHz, Tamb = 25°C
RL = 32Ω
Vcc = 4.8V, G = 0dB
Inputs = 0° & 180°
BW < 30kHz, Tamb = 25°C
1
THD+N (%)
THD+N (%)
10
Output Power (mW)
Figure 33. THD+N vs. output power
(RL = 32 Ω, VCC = 4.8 V, G = 0 dB)
10
1
1
0.1
F=8kHz
0.1
F=8kHz
0.01
0.01
F=80Hz
1E-3
F=1kHz
F=1kHz
F=80Hz
1E-3
0.1
1
10
Output Power (mW)
100
Figure 34. THD+N vs. output power
(RL = 32 Ω, VCC = 4.8 V, G = 20 dB)
1E-4
0.1
100
1
RL = 32Ω
Vcc = 4.8V, G = 20dB
Inputs = 0° & 180°
BW < 30kHz, Tamb = 25°C
RL = 16Ω
Vcc = 3.0V to 4.8V
G = 0dB, Inputs = 0° & 180°
Bw < 20kHz, Tamb = 25°C
THD + N (%)
THD+N (%)
10
Output Power (mW)
Figure 35. THD+N vs. frequency
(RL = 16 Ω, G = 0 dB)
10
1
1
0.1
F=8kHz
0.1
Po=1mW
0.01
0.01
Po=15mW
F=1kHz
1E-3
0.1
14/31
F=80Hz
1
10
Output Power (mW)
100
1E-3
20
Doc ID 17913 Rev 1
100
1000
Frequency (Hz)
10000 20k
TS4604
Characteristics of the headset driver
Figure 36. THD+N vs. frequency
(RL = 16 Ω, G = 20 dB)
Figure 37. THD+N vs. frequency
(RL = 32 Ω, G = 0 dB)
1
RL = 16Ω
Vcc = 3.0V to 4.8V
G = 20dB, Inputs = 0° & 180°
Bw < 20kHz, Tamb = 25°C
0.1
Po=1mW
THD + N (%)
THD + N (%)
1
0.01
RL = 32Ω
Vcc = 3.0V to 4.8V
G = 0dB, Inputs = 0° & 180°
Bw < 20kHz, Tamb = 25°C
0.1
Po=1mW
0.01
Po=15mW
1E-3
20
100
1000
Frequency (Hz)
1E-3
10000 20k
Figure 38. THD+N vs. frequency
(RL = 32 Ω, G = 20 dB)
100
1000
Frequency (Hz)
10000 20k
Figure 39. CMRR vs. frequency (headset)
1
0
RL = 32Ω
Vcc = 3.0V to 4.8V
G = 20dB, Inputs = 0° & 180°
Bw < 20kHz, Tamb = 25°C
-10
-20
-30
CMRR (dB)
0.1
THD + N (%)
Po=10mW
20
Po=1mW
0.01
ΔVic = 200mVpp
Vcc = 3.3V
RL ≥ 16Ω
Tamb = 25°C
-40
G=20dB
-50
-60
G=0dB
-70
Po=10mW
-80
-90
1E-3
20
100
1000
Frequency (Hz)
10000 20k
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
20
Vripple = 200mVpp
Vcc = 3.3V
Inputs = grounded
RL ≥ 16Ω
Tamb = 25°C
G=20dB
G=0dB
100
1000
Frequency (Hz)
10000 20k
100
1000
Frequency (Hz)
10000 20k
Figure 41. Crosstalk vs. frequency
(left to right, Pout = 50 mW)
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
20
Crosstalk (dB)
PSRR (dB)
Figure 40. PSSR vs. frequency (headset)
-100
20
Doc ID 17913 Rev 1
Vcc = 3.3V
Pout = 50mW, G=0dB
RL = 16Ω
Tamb = 25°C
Left to Right
Right to Left
100
1000
Frequency (Hz)
10000 20k
15/31
Characteristics of the headset driver
TS4604
Figure 42. Crosstalk vs. frequency
(left to right, Pout = 35 mW)
Vcc = 3.3V
Pout = 35mW, G=0dB
RL = 32Ω
Tamb = 25°C
Left to Right
Right to Left
100
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
20
Crosstalk (dB)
Crosstalk (dB)
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
20
Figure 43. Crosstalk vs. frequency
line driver to headset
1000
Frequency (Hz)
10000 20k
Figure 44. Frequency response
10
0
-10
Gain (dB)
-20
-30
-40
-50
-60
-70
Vcc = 3.3V, G=0dB
No load
Tamb = 25°C
-80
1000
16/31
10000
100000
1000000
Frequency (Hz)
1E7
Doc ID 17913 Rev 1
Vcc = 3.3V
Vout = 2Vrms on LD, G=0dB
RL = 10kΩ on LD
HP inputs = ground
Tamb = 25°C
LD to HP left
100
1000
Frequency (Hz)
LD to HP right
10000 20k
TS4604
Application information
6
Application information
6.1
General description
The TS4604 is a stereo headset driver and a ground-referenced stereo audio line driver. To
save energy, each audio path, line driver or headphone can be independently set to standby
mode.
The headphone delivers up to 100 mW into a 16 Ω load, and the line driver drives up to
2 Vrms into 5k or more. The gain can be set up to 20 dB by changing the values of the
external gain resistors.
The outputs of the headphone and line driver are protected against overloads. Overloads
can occur when the outputs are short-circuited between them or to Gnd or to VCC. There is
also an internal thermal shutdown activated at 150°C (typical) and deactivated at 120°C
(typical).
To remove the bulky output DC blocking capacitor and maximize the output swing of the
amplifier, the TS4604 embeds a low noise internal negative supply. All amplifiers are
supplied between a positive voltage +Vp and a negative voltage -Vn. With this architecture,
the output voltage is centered on 0 V, allowing the swing of the output voltage between the
positive and negative rail, as depicted in Figure 45.
Both the line driver and headset driver use this architecture.
Figure 45. TS4604 voltage for one channel
Vcc
+Vp
Vreg
In-
-
+Vp
0V
Out
In+
+
Negative
supply
-Vn
Vreg
-Vn
AM06139
Note:
The PVSSHP and PVSSLD voltages are generated internally by the internal negative
supply. To avoid damage to the TS4604, do not connect an external power supply on
the PVSSHP and PVSSLD pins.
Doc ID 17913 Rev 1
17/31
Application information
6.2
TS4604
Use of ceramic capacitors
We advise using ceramic capacitors for the decoupling, flying or tank capacitors because of
their low ESR properties. The rated voltage of the ceramic capacitor, however, is an
important parameter to take into consideration.
A 1 µF/6.3 V capacitor used at 4.8 V DC typically loses about 40% of its value. In fact, with a
4.8 V power supply voltage, the decoupling value is about 0.6 µF instead of 1 µF. Because
the decoupling capacitor influences the THD+N in the medium-to-high frequency region, this
capacitor variation becomes decisive. In addition, less decoupling means higher overshoots,
which can be problematic if they reach the power supply's AMR value (5.5 V).
This is why it is recommend to use a 1 µF/10 V/X5R or a 2.2 µF/6.3 V/X5R, or a new kind of
ceramic capacitor with a low DC bias variation rated at 6.3 V.
If a 1 µF/10 V ceramic capacitor is used, at 4.8 V the capacitance will be 0.82 µF.
If a 2.2 µF/6.3 V ceramic capacitor is used, at 4.8 V the capacitance will be 1.1 µF.
6.3
Flying and tank capacitor for the internal negative supply
The TS4604 embeds two independent internal negative supplies as shown in Figure 1.
Each of them requires two capacitors to work properly (a flying and a tank capacitor). The
internal negative supply capacitor must be correctly selected to generate an efficient
negative voltage.
Two flying capacitors (CHP and CLD) of 1 µF each with low ESR are recommended for
internal negative power supply operation.
●
CHP between pins 8 and 21.
●
CLD between pins 7 and 22.
Two tank capacitors (CPvss_HP and CPvss_LD) of 1 µF each with low ESR are
recommended for internal negative power supply energy storage.
●
CPvss_HP between pin 9 and ground.
●
CPvss_LD between pin 6 and ground.
An X5R dielectric for capacitor tolerance should be used. In order to take into consideration
the ΔC/ΔV variation of this type of dielectric (see Section 6.2 above), we also recommend:
●
a 10 V DC rating voltage for 4.8 V power supply operation.
●
a 6.3 V DC rating operation for 3.3 V power supply operation.
These capacitors must be placed as close as possible to the TS4604 to minimize parasitic
inductance and resistance that have a negative impact on the audio performance.
6.4
Power supply decoupling capacitor (Cs)
A 1 µF decoupling capacitor (Cs) with low ESR is mandatory for the positive power supply
X5R dielectric for capacitor tolerance behavior. In order to take into consideration the ΔC/ΔV
variation of this type of dielectric (see Section 6.2 above), it is also recommended to use:
18/31
●
a 10 V DC rating voltage for 4.8 V power supply operation.
●
a 6.3 V DC rating operation for 3.3 V power supply operation.
Doc ID 17913 Rev 1
TS4604
Application information
These capacitors must be placed as close as possible to the TS4604 to minimize parasitic
inductance and resistance that have a negative impact on the audio performance.
6.5
Input coupling capacitor (Cin)
An input coupling capacitor (Cin) might be used for TS4604 operation to block any DC
component of the audio signal.
Cin starts to have an effect in the low frequency region. Cin forms with Rin a high-pass filter
with a -3 dB cut-off frequency.
1
Fc ( – 3dB ) = ------------------------------------------ ( Hz )
2.π ⋅ Rin ⋅ Cin
Example
A differential input gain as shown in Figure 46 on page 20 with the gain equalling 0 dB
(Rin = 10 kΩ, Rfd = 10 kΩ) and an input capacitor of 2.2 µF gives:
1
- = 7.2Hz
Fc = --------------------------------------------------------------–6
2.π ⋅ 10000 ⋅ 2.2e10
The high-pass filter has a -3 dB cut-off frequency at 7.2 Hz in this case.
6.6
Range of the gain setting resistors
The TS4604 can be use in different configurations, as shown in figures 46, 47 and 48.
The gain is given by the external resistors Rfd divided by Rin. The feedback resistor Rfd
does not exceed 100 kΩ for closed-loop stability reasons.
Table 7 gives the recommended resistor values and the gain for different types of
application.
Table 7.
Recommended resistors values
Rin
Rfd
Differential gain
Inverting gain
Non-inverting gain
10 kΩ
10 kΩ
0 dB
0 dB
6 dB
10 kΩ
20 kΩ
6 dB
6 dB
10 dB
10 kΩ
50 kΩ
14 dB
14 dB
16 dB
4.7 kΩ
47 kΩ
20 dB
20 dB
21 dB
10 kΩ
100 kΩ
20 dB
20 dB
21 dB
Doc ID 17913 Rev 1
19/31
Application information
TS4604
Figure 46. Example of a TS4604 differential input
Rfd
Cin
Rin
VinVout
Vin+
Rin
Cin
Rfd
AM06140
Figure 47. Example of a TS4604 inverting input
Rfd
Cin
Rin
VinVout
AM06141
Figure 48. Example of a TS4604 non-inverting input
Rfd
Cin
Rin
Vout
Vin+
Cin
Rx
AM06142
20/31
Doc ID 17913 Rev 1
TS4604
6.7
Application information
Performance of CMRR
When the TS4604 is used in differential mode (Figure 46), because of the resistor matching
the CMRR can have important variations.
To minimize these variations, we recommend using the same kind of resistor (same
tolerance).
The following equation is valid for frequencies ranging from DC to about kHz. The equation
is simplified by neglecting the ΔR² terms. ΔR is the tolerance value as a percentage.
100
CMRR ≈ 20 ⋅ log ------------ ⎛ 1 + Rfd
----------⎞ ( dB )
4ΔR ⎝
Rin⎠
It is extremely important to correctly match the resistors to obtain a good CMRR.
All the tests have been performed with resistors with a tolerance value of 0.1%.
Example:
With ΔR = 1% the minimum CMRR would be 34 dB.
With ΔR = 0.1% the minimum CMRR would be 54 dB.
6.8
Internal and external undervoltage detection
The TS4604 embeds two UVLOs: one internal and one external.
6.8.1
Internal UVLO
The internal UVLO monitors the power supply via pins PVCC_HP (20) and PVCC_LD(23).
The threshold is set to 2.8 V with a 200 mV hysteresis. If the power supply decreases to
2.6 V, the TS4604 switches to standby mode. To switch the device on again, the power
supply voltage must increase to above 2.8 V.
Refer to Table 4 for the tolerance of the UVLO voltage.
6.8.2
External UVLO
The Ex_UVP pin (25) is an external undervoltage detection input that can be used to start
up or shutdown the TS4604 by applying the correct voltage value. A 1.25 V internal
precision voltage is used as a reference to monitor the voltage applied to the Ex_UPVP pin.
To set a desired shutdown threshold and hysteresis for the application, a resistor divider can
be calculated as follows.
( R1 + R2 )
Vuvp = 1.25V ⋅ --------------------------R1
Vhyst≈ 5μA ⋅ R3 ⋅ ⎛ R2
-------- + 1⎞
⎝ R1
⎠
with the condition R3>>R1//R2.
Doc ID 17913 Rev 1
21/31
Application information
TS4604
For example, to obtain Vuvp = 3.3 V with a hysteresis of 200 mV:
●
R1 = 1 kΩ
●
R2 = 1.6 kΩ
●
R3 = 15 kΩ
Figure 49. External UVLO
Vcc
External sense voltage
1.6 k
R2
5 µA
15 k
+
R3
-
1k
R1
Precision
band gap
1.25 V
TS4604
AM06143
Figure 50. Hysteresis of the external UVLO
Icc
VHyst
Vuvp
External sense
voltage
AM06144
When the external sense voltage (ESV) increases, the TS4604 stays in standby mode until
the EUVP pin reaches 1.25 V (voltage across the divider R1, R2). At this point, the TS4604
starts, as does the internal 5 µA current source connected to the EUVP pin. Thanks to this
5 µA current, a voltage drop is created across the R3 resistor.
22/31
Doc ID 17913 Rev 1
TS4604
Application information
To switch the TS4604 back to standby, the voltage across the divider R1, R2 has to be lower
than 1.25 V - VHyst × R1/(R1 + R2). The ESV can be an external voltage or simply the
power supply voltage PVcc_LD/HD.
6.9
2nd order Butterworth low-pass filter
The TS4604 can also be configured as a low-pass filter to be driven directly by a DAC
output. It can be used, for example, as a 2nd order low-pass filter, with either a differential
input or a single-ended input.
Figure 51 and Figure 52 depict these two kinds of application and represent a multiple
feedback 2nd order low-pass filter.
An AC-coupling capacitor should be added to block any DC component from the source,
which helps to reduce the output DC offset to a minimum.
Figure 51. Multi-feedback filter with
differential input
Figure 52. Multi-feedback filter with singleended input
Rfd
Rfd
Cin
Rin
R1
C1
VinCin
C2
Vout
Vin+
Cin
Rin
R1
Rin
R1
C1
VinC2
C1
Vout
Rfd
AM06145
AM06146
Example 2nd-order multi-feedback filter in differential mode
Figure 53 shows a filter in differential mode with a cut-off frequency at 30 kHz (configured as
per the values in Table 8, which proposes various filter options using a differential input).
Doc ID 17913 Rev 1
23/31
Application information
TS4604
Figure 53. Frequency response 2nd-order MFB filter
5
4
3
2
1
Gain (dB)
0
-1
-2
-3
-4
-5
R1 = Rin = 10kΩ,
Rfd = 24kΩ,
C1 = 680pF,
C2 = 120pF,
-6
-7
-8
-9
1
10
100
1000
10000
100000
Frequency (Hz)
Table 8.
Recommended values for 2nd order low-pass filter
Low-pass filter
Rin
R1
Rfd
C1
C2
25 kHz
10 kΩ
10 kΩ
15 kΩ
1 nF
200 pF
30 kHz
10 kΩ
10 kΩ
24 kΩ
680 pF
120 pF
6.10
ESD protection and compliance
To provide excellent ESD immunity, an audio line IPAD(a) (STMicroelectronics reference
EMIF04-EAR02M8) can be added at the output of the TS4604 (Figure 54).
By adding the IPAD, the TS4604 complies with the standard IEC 61000-4-2 level 4 on the
external pins.
●
OUT_HPL and OUT_HPR for the headphone driver.
●
OUT_LDL and OUT_LDR for the Line driver.
a. Copyright ST Microelectronics.
24/31
Doc ID 17913 Rev 1
TS4604
Application information
Figure 54. TS4604 with IPAD for ESD immunity
InR-
OUT_R
A1
InR+
OUT_R
A2
+
Gnd
InL-
B2
OUT_L
C1
InL+
Gnd
Gnd
C2
OUT_L
IPAD
+
TS4604
AM06147
6.11
Pop-&-click circuitry
Thanks to the internal negative supply the headphone and line driver outputs are referred to
ground without the need for bulky in-series capacitors. As a result, the pop created by these
bulky capacitors is eliminated. In addition, the TS4604 includes a pop-&-click circuitry that
suppresses any residual pop on the outputs, thus enabling the outputs to be virtually pop-&click-free.
6.12
Start-up phase
To further improve the pop-&-click performance, two important points must be taken into
account during the start-up phase.
Input capacitor
During the start up phase, as long as the AC input coupling capacitors are not fully charged,
we suggested to remain the EN_LD and En_HP and/or Ext_UVP pin low.
The constant time for an RC filter is given by:
τ = Rin ⋅ Cin
We can consider that the input capacitor Cin will be charged at 95% of its maximum value
at:
T = 3τ
Doc ID 17913 Rev 1
25/31
Application information
TS4604
With a gain set at G = 0 dB, a Rin = 10 kΩ and Cin = 2.2 µF, to charge Cin to 95% of its final
value, 66 ms are necessary.
Wake-up time of the TS4604
The TS4604 needs 30 ms to become fully operational (see Table 5 and Table 6).
The total startup sequence with the settings described being 66 ms, and since the TS4604
needs 30 ms to wake up, the Enable pin for the line driver and/or headphone can be set high
36 ms after the power supply has reached its normal value (Figure 55).
With a lower input capacitance, the startup phase is quicker.
Figure 55. Power-up/down sequence
Supply
Supply ramp
EN_xx
36 ms
Vout
30 ms
66 ms
AM06148
6.13
Layout recommendations
Particular attention must be given to the correct layout of the PCB traces and wires between
the amplifier, load and power supply.
The power and ground traces are critical since they must provide adequate energy and
grounding for all circuits. Good practice is to use short and wide PCB traces to minimize
voltage drops and parasitic inductance.
Proper grounding guidelines help improve audio performances, minimize crosstalk between
channels, and prevent switching noise from coupling into the audio signal. It is also
recommended to use a large-area and multi-via ground plane to minimize parasitic
impedance.
Connect all the VCC tracks (PVCCLD and PVCCHP) to one point one the board.
The copper traces that connect the output pins to the load and supply pins should be as
wide as possible to minimize the trace resistances.
The gain setting resistors must be placed as close as possible to the input in order to
minimize the parasitic capacitors on these inputs pins.
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7
Package information
Package information
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
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Package information
7.1
TS4604
TSSOP28 package
Figure 56. TSSOP28 pitch 0.65 mm mechanical drawing
Table 9.
TSSOP28 pitch 0.65 mm mechanical data
Dimensions
Ref.
Millimeters
Min.
Typ.
A
Max.
Min.
Typ.
1.20
A1
0.05
A2
0.80
b
Max.
0.047
0.15
0.002
1.05
0.031
0.19
0.30
0.007
0.011
c
0.09
0.20
0.003
0.008
D
9.60
9.70
9.80
0.378
0.382
0.386
E
6.20
6.40
6.60
0.244
0.252
0.260
E1
4.30
4.40
4.50
0.170
0.173
0.177
e
L
k
aaa
1.00
0.65
0.45
L1
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Inches
0.60
0.039
0.041
0.026
0.75
1.00
0
0.006
0.018
0.024
0.030
0.040
8
0.10
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8
Ordering information
Ordering information
Table 10.
Order codes
Part number
Temperature
range
Gain
Package
Marking
TS4604IPT
-40°C, +85°C
External
TSSOP28
4604
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Revision history
9
TS4604
Revision history
Table 11.
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Document revision history
Date
Revision
27-Oct-2010
1
Changes
Initial release.
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