TS4995EIJT [STMICROELECTRONICS]
1.2 W fully differential audio power amplifier with selectable standby and 6 dB fixed gain; 1.2 W全差分音频功率放大器可选择待机和6分贝固定增益
| 型号： | TS4995EIJT |
| 厂家： | 
ST |
| 描述： | 1.2 W fully differential audio power amplifier with selectable standby and 6 dB fixed gain |
| 文件： | 总26页 (文件大小：443K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TS4995
1.2 W fully differential audio power amplifier
with selectable standby and 6 dB fixed gain
Features
TS4995 - Flip chip 9
■ Differential inputs
■ 90 dB PSRR @ 217 Hz with grounded inputs
■ Operates from V = 2.5 V to 5.5 V
Pin connections (top view)
CC
■ 1.2 W rail-to-rail output power @ V =5 V,
CC
THD+N=1%, F=1 kHz, with an 8 Ω load
Gnd
■ 6 dB integrated fixed gain
VO-
Bypass
VIN+
VO+
7
6
9
5
■ Ultra-low consumption in standby mode
(10 nA)
Stdby
VIN-
4
3
8
1
■ Selectable standby mode (active low or active
high)
■ Ultra-fast startup time: 10 ms typ. at V =3.3 V
CC
2
■ Available in 9-bump flip chip (300 mm bump
VCC
Stdby Mode
diameter)
■ Ultra-low pop and click
Applications
The TS4995 features an internal fixed gain at 6dB
which reduces the number of external
components on the application board.
■ Mobile phones (cellular / cordless)
■ PDAs
The device is equipped with common mode
feedback circuitry allowing outputs to be always
■ Laptop / notebook computers
■ Portable audio devices
biased at V /2 regardless of the input common
CC
mode voltage.
Description
The TS4995 is specifically designed for high
quality audio applications such as mobile phones
and requires few external components.
The TS4995 is an audio power amplifier capable
of delivering 1.2 W of continuous RMS output
power into an 8 Ω load at 5 V. Thanks to its
differential inputs, it exhibits outstanding noise
immunity.
An external standby mode control reduces the
supply current to less than 10 nA. A STBY MODE
pin allows the standby pin to be active high or
low. An internal thermal shutdown protection is
also provided, making the device capable of
sustaining short-circuits.
March 2008
Rev 3
1/26
www.st.com
26
Contents
TS4995
Contents
1
2
3
4
Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 3
Typical application schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
Differential configuration principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Common mode feedback loop limitations . . . . . . . . . . . . . . . . . . . . . . . . . 17
Low frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Power dissipation and efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Decoupling of the circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Wake-up time tWU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Shutdown time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Pop performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Single-ended input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5
6
7
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2/26
TS4995
Absolute maximum ratings and operating conditions
1
Absolute maximum ratings and operating conditions
Table 1.
Symbol
Absolute maximum ratings (AMR)
Parameter
Value
Unit
VCC
Vin
Supply voltage (1)
Input voltage (2)
6
GND to VCC
-40 to + 85
-65 to +150
150
V
V
Toper
Tstg
Tj
Operating free air temperature range
Storage temperature
°C
°C
°C
°C/W
W
Maximum junction temperature
Thermal resistance junction to ambient (3)
Power dissipation
MM: machine model (4)
HBM: human body model (5)
Rthja
Pdiss
200
Internally limited
200
V
ESD
1.5
kV
mA
°C
Latch-up Latch-up immunity
200
-
Lead temperature (soldering, 10sec)
260
1. All voltage values are measured with respect to the ground pin.
2. The magnitude of input signal must never exceed VCC + 0.3 V / GND - 0.3 V.
3. The device is protected in case of over temperature by a thermal shutdown activated at 150° C.
4. Machine model: a 200 pF cap is charged to the specified voltage, then discharged directly between two pins of the device
with no external series resistor (internal resistor < 5 Ω), done for all couples of pin combinations with other pins floating.
5. Human body model: 100 pF discharged through a 1.5 kΩ resistor between two pins of the device, done for all couples of pin
combinations with other pins floating.
Table 2.
Symbol
VCC
Operating conditions
Parameter
Value
Unit
Supply voltage
2.5 to 5.5
V
Standby mode voltage input:
VSM
V
V
Standby Active LOW
Standby Active HIGH
VSM=GND
VSM=VCC
Standby voltage input:
VSTBY
Device ON (VSM=GND) or Device OFF (VSM=VCC
Device OFF (VSM=GND) or Device ON (VSM=VCC
)
)
1.5 ≤ VSTBY ≤ VCC
GND ≤ VSTBY ≤ 0.4 (1)
TSD
RL
Thermal shutdown temperature
Load resistor
150
≥ 4
°C
Ω
Rthja
Thermal resistance junction to ambient
100
°C/W
1. The minimum current consumption (ISTBY) is guaranteed when VSTB Y= GND or VCC (the supply rails) for the whole
temperature range.
3/26
Typical application schematics
TS4995
2
Typical application schematics
Table 3.
Component
Cs
External component descriptions
Functional description
Supply bypass capacitor that provides power supply filtering.
Bypass capacitor that provides half supply filtering.
Cb
Optional input capacitor that forms a high pass filter together with Rin.
Cin
(Fcl = 1 / (2 x π x Rin x Cin)
Figure 1.
Typical application
VCC
Cs1
1uF
TS4995 FlipChip
TS4995
Optional
Cin1
Vin-
P1
Vo-
3
Vin-
7
5
330nF
Cin2
Vo+
P2
1
8
Vin+
8 Ohms
+
Vin+
330nF
BYPASS
BIAS
1uF
STBY
STDBY
STDBY MODE
Cbypass1
VCC
4/26
TS4995
Electrical characteristics
3
Electrical characteristics
Table 4.
Symbol
V
= +5V, GND = 0V, T
= 25°C (unless otherwise specified)
amb
CC
Parameter
Test conditions
Min. Typ. Max. Unit
mA
ICC
Supply current
No input signal, no load
4
7
No input signal, VSTBY = VSM = GND, RL = 8Ω
No input signal, VSTBY = VSM = VCC, RL = 8Ω
ISTBY Standby current
10 1000 nA
Differential output offset
voltage
Voo
No input signal, RL = 8Ω
0.1
10
mV
VIC
Po
Input common mode voltage
Output power
0
4.5
V
THD = 1% Max, F= 1kHz, RL = 8Ω
0.8
1.2
0.5
W
Total harmonic distortion +
noise
THD + N
PSRRIG
Po = 850mW rms, 20Hz ≤ F ≤ 20kHz, RL = 8Ω
%
dB
dB
Power supply rejection ratio F = 217Hz, R = 8Ω, Cin = 4.7µF, Cb =1µF
with inputs grounded(1)
ripple = 200mVPP
75(2) 90
60
V
F = 217Hz, RL = 8Ω, Cin = 4.7µF, Cb =1µF
Vic = 200mVPP
CMRR Common mode rejection ratio
A-weighted filter
SNR Signal-to-noise ratio
dB
RL = 8Ω, THD +N < 0.7%, 20Hz ≤ F ≤ 20kHz
100
2
GBP Gain bandwidth product
RL = 8Ω
MHz
20Hz ≤ F ≤ 20kHz, RL = 8Ω
Unweighted
A-weighted
11
7
VN
Output voltage noise
µVRMS
Unweighted, standby
A-weighted, standby
3.5
1.5
Zin
-
Input impedance
Gain mismatch
15
20
6
25
kΩ
dB
ms
5.5
6.5
tWU Wake-up time(3)
Cb =1µF
15
1. Dynamic measurements - 20*log(rms(Vout)/rms (Vripple)). Vripple is the super-imposed sinus signal relative to VCC
2. Guaranteed by design and evaluation.
.
3. Transition time from standby mode to fully operational amplifier.
5/26
Electrical characteristics
TS4995
Table 5.
V
= +3.3V (all electrical values are guaranteed with correlation measurements at
CC
2.6V and 5V), GND = 0V, T
= 25°C (unless otherwise specified)
amb
Symbol
Parameter
Test conditions
Min. Typ. Max. Unit
mA
ICC
Supply current
No input signal, no load
3
7
No input signal, VSTBY = VSM = GND, RL = 8Ω
No input signal, VSTBY = VSM = VCC, RL = 8Ω
ISTBY Standby current
10 1000 nA
Differential output offset
voltage
Voo
No input signal, RL = 8Ω
0.1
10
mV
VIC
Po
Input common mode voltage
Output power
0.4
2.3
V
THD = 1% max, F= 1kHz, RL = 8Ω
300 500
0.5
mW
Total harmonic distortion +
noise
THD + N
PSRRIG
Po = 300mW rms, 20Hz ≤ F ≤ 20kHz, RL = 8Ω
%
dB
dB
Power supply rejection ratio F = 217Hz, R = 8Ω, Cin = 4.7µF, Cb =1µF
75(2) 90
60
with inputs grounded(1)
Vripple = 200mVPP
F = 217Hz, RL = 8Ω, Cin = 4.7µF, Cb =1µF
CMRR Common mode rejection ratio
Vic = 200mVPP
A-weighted filter
SNR Signal-to-noise ratio
dB
RL = 8Ω, THD +N < 0.7%, 20Hz ≤ F ≤ 20kHz
100
2
GBP Gain bandwidth product
RL = 8Ω
MHz
20Hz ≤ F ≤ 20kHz, RL = 8Ω
Unweighted
A weighted
11
7
VN
Output voltage noise
µVRMS
Unweighted, standby
A weighted, standby
3.5
1.5
Zin
-
Input impedance
Gain mismatch
15
20
6
25
kΩ
dB
ms
5.5
6.5
tWU Wake-up time(3)
Cb =1µF
10
1. Dynamic measurements - 20*log(rms(Vout)/rms (Vripple)). Vripple is the super-imposed sinus signal relative to VCC
2. Guaranteed by design and evaluation.
.
3. Transition time from standby mode to fully operational amplifier.
6/26
TS4995
Electrical characteristics
Table 6.
Symbol
V
= +2.6V, GND = 0V, T
= 25°C (unless otherwise specified)
amb
CC
Parameter
Test conditions
Min. Typ. Max. Unit
ICC
Supply current
No input signal, no load
3
7
mA
nA
No input signal, VSTBY = VSM = GND, RL = 8Ω
No input signal, VSTBY = VSM = VCC, RL = 8Ω
ISTBY Standby current
10 1000
Differential output offset
voltage
Voo
No input signal, RL = 8Ω
0.1
10
mV
VIC
Po
Input common mode voltage
Output power
0.6
1.5
V
THD = 1% max, F= 1kHz, RL = 8Ω
200 300
0.5
mW
Total harmonic distortion +
noise
THD + N
PSRRIG
CMRR
Po = 225mW rms, 20Hz ≤ F ≤ 20kHz, RL = 8Ω
%
Power supply rejection ratio F = 217Hz, R = 8Ω, Cin = 4.7μF, Cb =1µF
75(2) 90
60
dB
dB
with inputs grounded(1)
Vripple = 200mVPP
Common mode rejection
ratio
F = 217Hz, RL = 8Ω, Cin = 4.7μF, Cb =1µF
Vic = 200mVPP
A-weighted filter
SNR Signal-to-noise ratio
dB
RL = 8Ω, THD +N < 0.7%, 20Hz ≤ F ≤ 20kHz
100
2
GBP Gain bandwidth product
RL = 8Ω
MHz
20Hz ≤F ≤20kHz, RL = 8Ω
Unweighted
A weighted
11
7
VN
Output voltage noise
µVRMS
Unweighted, standby
A weighted, standby
3.5
1.5
Zin
-
Input impedance
Gain mismatch
Wake-up time(3)
15
20
6
25
kΩ
dB
ms
5.5
6.5
tWU
Cb =1µF
10
1. Dynamic measurements - 20*log(rms(Vout)/rms (Vripple)). Vripple is the super-imposed sinus signal relative to VCC
2. Guaranteed by design and evaluation.
.
3. Transition time from standby mode to fully operational amplifier.
7/26
Electrical characteristics
TS4995
Figure 2.
THD+N vs. output power
Figure 3.
THD+N vs. output power
10
10
RL = 8
G = 6dB
Ω
RL = 8
G = 6dB
Ω
Vcc=5V
Vcc=5V
F = 20Hz
F = 20Hz
Cb = 0
BW < 125kHz
Cb = 1
μF
Vcc=3.3V
Vcc=2.6V
Vcc=3.3V
Vcc=2.6V
BW < 125kHz
Tamb = 25
1
0.1
1
0.1
°
C
Tamb = 25°C
0.01
1E-3
0.01
1E-3
0.01
0.1
1
0.01
0.1
1
Output power (W)
Output power (W)
Figure 4.
THD+N vs. output power
Figure 5.
THD+N vs. output power
10
10
RL = 16
G = 6dB
F = 20Hz
Cb = 1
BW < 125kHz
Ω
RL = 16
G = 6dB
F = 20Hz
Cb = 0
BW < 125kHz
Ω
Vcc=5V
Vcc=5V
Vcc=3.3V
μ
F
Vcc=3.3V
1
0.1
1
0.1
Tamb = 25
°
C
Tamb = 25°C
Vcc=2.6V
Vcc=2.6V
0.01
1E-3
0.01
1E-3
0.01
0.1
1
0.01
0.1
Output power (W)
1
Output power (W)
Figure 6.
THD+N vs. output power
Figure 7.
THD+N vs. output power
10
10
RL = 4
G = 6dB
F = 1kHz
Cb = 0
BW < 125kHz
Ω
RL = 4
Ω
G = 6dB
F = 1kHz
Vcc=5V
Vcc=5V
Vcc=3.3V
Cb = 1
BW < 125kHz
Tamb = 25
μF
Vcc=3.3V
Tamb = 25°C
°
C
1
1
Vcc=2.6V
Vcc=2.6V
0.1
1E-3
0.01
0.1
1
0.1
1E-3
0.01
0.1
1
Output power (W)
Output power (W)
8/26
TS4995
Electrical characteristics
Figure 8.
THD+N vs. output power
Figure 9.
THD+N vs. output power
10
10
RL = 8
Ω
G = 6dB
F = 1kHz
RL = 8Ω
G = 6dB
F = 1kHz
Cb = 0
BW < 125kHz
Vcc=5V
Vcc=5V
Cb = 1
BW < 125kHz
Tamb = 25
μF
Vcc=3.3V
Vcc=2.6V
Vcc=3.3V
Vcc=2.6V
1
0.1
1
0.1
°
C
Tamb = 25°C
0.01
1E-3
0.01
1E-3
0.01
0.1
1
0.01
0.1
1
Output power (W)
Output power (W)
Figure 10. THD+N vs. output power
Figure 11. THD+N vs. output power
10
10
RL = 16
G = 6dB
F = 1kHz
Cb = 1μF
BW < 125kHz
Tamb = 25
Ω
RL = 16Ω
G = 6dB
F = 1kHz
Cb = 0
BW < 125kHz
Vcc=5V
Vcc=3.3V
Vcc=5V
Vcc=3.3V
1
0.1
1
0.1
°
C
Tamb = 25°C
Vcc=2.6V
Vcc=2.6V
0.01
1E-3
0.01
1E-3
0.01
0.1
1
0.01
0.1
1
Output power (W)
Output power (W)
Figure 12. THD+N vs. output power
Figure 13. THD+N vs. output power
10
10
RL = 4
Ω
RL = 4Ω
G = 6dB
F = 20kHz
G = 6dB
F = 20kHz
Cb = 0
BW < 125kHz
Tamb = 25°C
Vcc=5V
Vcc=5V
Cb = 1
BW < 125kHz
Tamb = 25
μF
Vcc=3.3V
Vcc=3.3V
°
C
1
1
Vcc=2.6V
Vcc=2.6V
0.1
1E-3
0.1
1E-3
0.01
0.1
1
0.01
0.1
1
Output power (W)
Output power (W)
9/26
Electrical characteristics
TS4995
Figure 14. THD+N vs. output power
Figure 15. THD+N vs. output power
10
10
RL = 8
G = 6dB
F = 20kHz
Cb = 1
BW < 125kHz
Tamb = 25
Ω
RL = 8Ω
G = 6dB
F = 20kHz
Cb = 0
BW < 125kHz
Vcc=5V
Vcc=3.3V
Vcc=5V
Vcc=3.3V
μF
°
C
Tamb = 25°C
1
1
Vcc=2.6V
Vcc=2.6V
0.1
0.1
1E-3
0.01
0.1
1
1E-3
0.01
0.1
1
Output power (W)
Output power (W)
Figure 16. THD+N vs. output power
Figure 17. THD+N vs. output power
10
10
RL = 16
G = 6dB
Ω
RL = 16Ω
G = 6dB
Vcc=5V
Vcc=5V
F = 20kHz
Cb = 1μF
BW < 125kHz
Tamb = 25
F = 20kHz
Cb = 0
BW < 125kHz
Vcc=3.3V
Vcc=3.3V
1
0.1
1
0.1
°
C
Tamb = 25°C
Vcc=2.6V
Vcc=2.6V
0.01
1E-3
0.01
1E-3
0.01
0.1
1
0.01
0.1
1
Output power (W)
Output power (W)
Figure 18. THD+N vs. frequency
Figure 19. THD+N vs. frequency
10
10
RL = 4
G = 6dB
Cb = 1
BW < 125kHz
Tamb = 25
Ω
RL = 4Ω
G = 6dB
Cb = 0
BW < 125kHz
μ
F
Vcc=5V, Po=1000mW
Vcc=2.6V, Po=280mW
Vcc=5V, Po=1000mW
Vcc=2.6V, Po=280mW
°
C
Tamb = 25°C
1
1
0.1
0.1
Vcc=3.3V, Po=500mW
Vcc=3.3V, Po=500mW
0.01
0.01
100
1000
10000
100
1000
10000
Frequency (Hz)
Frequency (Hz)
10/26
TS4995
Electrical characteristics
Figure 20. THD+N vs. frequency
Figure 21. THD+N vs. frequency
10
10
RL = 8
G = 6dB
Cb = 1
Ω
RL = 8Ω
G = 6dB
Cb = 0
μ
F
BW < 125kHz
Tamb = 25C
BW < 125kHz
Tamb = 25C
Vcc=2.6V, Po=225mW
Vcc=2.6V, Po=225mW
1
1
Vcc=5V, Po=850mW
Vcc=3.3V, Po=300mW
Vcc=5V, Po=850mW
Vcc=3.3V, Po=300mW
0.1
0.1
0.01
0.01
100
1000
Frequency (Hz)
10000
100
1000
Frequency (Hz)
10000
Figure 22. THD+N vs. frequency
Figure 23. THD+N vs. frequency
10
10
RL = 16
G = 6dB
Cb = 1
Ω
RL = 16Ω
G = 6dB
Cb = 0
μ
F
BW < 125kHz
Tamb = 25C
BW < 125kHz
Tamb = 25C
1
1
Vcc=5V, Po=500mW
Vcc=5V, Po=500mW
Vcc=2.6V, Po=125mW
Vcc=2.6V, Po=125mW
0.1
0.1
Vcc=3.3V, Po=225mW
100
Vcc=3.3V, Po=225mW
100
0.01
0.01
1000
10000
1000
10000
Frequency (Hz)
Frequency (Hz)
Figure 24. Output power vs. power supply
voltage
Figure 25. Output power vs. power supply
voltage
10
2,4
Cb = 1μF
F = 1kHz
BW < 125 kHz
RL = 16
G = 6dB
Cb = 1
BW < 125kHz
Tamb = 25C
Ω
2,2
2,0
1,8
1,6
1,4
1,2
1,0
0,8
0,6
0,4
0,2
0,0
μ
F
Tamb = 25°C
4
Ω
1
Vcc=5V, Po=500mW
8
Ω
Vcc=2.6V, Po=125mW
0.1
16
Ω
32
Ω
Vcc=3.3V, Po=225mW
100
0.01
2,5
3,0
3,5
4,0
4,5
5,0
5,5
1000
10000
Vcc (V)
Frequency (Hz)
11/26
Electrical characteristics
TS4995
Figure 26. Output power vs. power supply
voltage
Figure 27. Power derating curves
2,0
Cb = 1μF
1.2
1.0
1,8
1,6
1,4
1,2
1,0
0,8
0,6
0,4
0,2
0,0
F = 1kHz
BW < 125 kHz
Tamb = 25°C
Heat sink surface ≈ 100mm2
4
Ω
0.8
0.6
0.4
0.2
0.0
8
Ω
16
Ω
No Heat sink
25
32
Ω
0
50
75
100
125
2,5
3,0
3,5
4,0
Vcc (V)
4,5
5,0
5,5
Ambiant Temperature (°C)
Figure 28. Output power vs. load resistance
Figure 29. Power dissipation vs. output power
1.4
2000
Vcc=5V
F=1kHz
THD+N<1%
THD+N = 1%
F = 1kHz
Vcc=5.5V
Vcc=5V
Vcc=4.5V
Vcc=4V
Vcc=3.3V
1800
1600
1400
1200
1000
800
600
400
200
0
1.2
Cb = 1
BW < 125kHz
Tamb = 25
μF
RL=4Ω
1.0
0.8
0.6
0.4
0.2
0.0
°
C
Vcc=2.6V
RL=8Ω
RL=16
Ω
4
6
8
10 12 14 16 18 20 22 24 26 28 30 32
Load Resistance (
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
Ω
)
Output Power (W)
Figure 30. Power dissipation vs. output power Figure 31. Power dissipation vs. output power
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
0.6
0.5
0.4
0.3
0.2
0.1
0.0
Vcc=3.3V
F=1kHz
THD+N<1%
Vcc=2.6V
F=1kHz
THD+N<1%
RL=4Ω
RL=4Ω
RL=8
Ω
RL=8
Ω
RL=16
Ω
RL=16
Ω
0.0
0.1
0.2
Output Power (W)
0.3
0.4
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
Output Power (W)
12/26
TS4995
Electrical characteristics
Figure 32. PSSR vs. frequency
Figure 33. PSSR vs. frequency
0
0
-10
Vcc = 2.6V
Vripple = 200mVpp
Vcc = 2.6V
Vripple = 200mVpp
-10
-20
-20
RL
≥ 8Ω
RL
≥ 8Ω
-30
-30
G = 6dB
Inputs floating
Tamb = 25°C
G = 6dB, Cin = 4.7
Inputs grounded
Tamb = 25°C
μF
-40
-40
Cb=0
-50
-50
Cb=0
-60
-60
-70
-70
Cb=1
100
μF, 0.47μF, 0.1μF
-80
-80
-90
-90
-100
-110
-100
-110
Cb=1
μ
F, 0.47
μ
F, 0.1
μF
20
20
1000
Frequency (Hz)
10000
10000
10000
100
1000
Frequency (Hz)
10000
Figure 34. PSSR vs. frequency
Figure 35. PSSR vs. frequency
0
0
Vcc = 3.3V
Vripple = 200mVpp
Vcc = 3.3V
Vripple = 200mVpp
-10
-20
-10
-20
RL
≥
8
Ω
RL ≥ 8Ω
G = 6dB
-30
-30
G = 6dB, Cin = 4.7
Inputs grounded
μ
F
Inputs floating
Tamb = 25°C
-40
-40
Tamb = 25
°
C
Cb=0
-50
-50
Cb=0
-60
-60
-70
Cb=1
μ
F, 0.47
μ
F, 0.1
μ
F
-70
-80
-80
-90
-90
Cb=1
1000
μF, 0.47μF, 0.1μF
-100
-110
-100
-110
20
20
100
1000
Frequency (Hz)
100
10000
Frequency (Hz)
Figure 36. PSSR vs. frequency
Figure 37. PSSR vs. frequency
0
0
Vcc = 5V
-10
Vcc = 5V
-10
-20
Vripple = 200mVpp
Vripple = 200mVpp
-20
RL
≥ 8Ω
RL
≥ 8Ω
-30
-40
-30
G = 6dB, Cin = 4.7
Inputs grounded
μ
F
G = 6dB
Inputs floating
Tamb = 25°C
-40
Cb=0
Tamb = 25
°
C
-50
-50
Cb=0
-60
-60
Cb=1μF, 0.47μF, 0.1μF
-70
-70
-80
-80
-90
-90
Cb=1, 0.47, 0.1μF
-100
-110
-100
-110
20
20
100
1000
Frequency (Hz)
100
1000
10000
Frequency (Hz)
13/26
Electrical characteristics
TS4995
Figure 38. PSSR vs. common mode input
voltage
Figure 39. PSSR vs. common mode input
voltage
20
20
0
Vcc = 5V
Vripple = 200mVpp
F = 217Hz
Vcc = 3.3V
Vripple = 200mVpp
F = 217Hz
0
G = 6dB
G = 6dB
-20
-40
-20
-40
-60
-80
-100
RL
≥
8
Ω
RL ≥ 8Ω
Tamb = 25°C
Tamb = 25°C
Cb=0.1
Cb=0.47
Cb=1
μ
F
Cb=0.1
Cb=0.47
Cb=1
μ
F
μ
F
μ
F
Cb=0
Cb=0
μ
F
μ
F
-60
-80
-100
0
1
2
3
4
5
0.0
0.6
1.2
1.8
2.4
3.0
Common Mode Input Voltage (V)
Common Mode Input Voltage (V)
Figure 40. PSSR vs. common mode input
voltage
Figure 41. CMRR vs. frequency
20
0
Vcc = 2.6V
Vcc = 5V
G = 6dB
Vic = 200mVpp
Vripple = 200mVpp
F = 217Hz
G = 6dB
-10
-20
-30
-40
-50
-60
-70
-80
0
RL
Cin = 470
Tamb = 25
≥ 8Ω
Cb=1
μF
-20
-40
RL
≥ 8Ω
μ
F
Cb=0.47
μ
F
Tamb = 25°C
°
C
Cb=0.1
Cb=0
μ
F
Cb=0.1
Cb=0.47
Cb=1
μ
F
Cb=0
μ
F
-60
μ
F
-80
-100
0.0
0.5
1.0
1.5
2.0
2.5
100
1000
10000
Common Mode Input Voltage (V)
Frequency (dB)
Figure 42. CMRR vs. frequency
Figure 43. CMRR vs. frequency
0
0
Vcc = 3.3V
Vcc = 2.6V
-10
-20
-30
-40
-50
-60
-70
-80
-10
-20
-30
-40
-50
-60
-70
-80
G = 6dB
Vic = 200mVpp
G = 6dB
Vic = 200mVpp
RL
Cin = 470
Tamb = 25
≥
8
Ω
RL
Cin = 470
Tamb = 25
≥ 8Ω
Cb=1
Cb=0.47
Cb=0.1
Cb=0
μ
F
Cb=1
Cb=0.47
Cb=0.1
Cb=0
μF
μ
F
μF
μ
F
F
μ
F
F
°
C
°
C
μ
μ
100
1000
10000
100
1000
10000
Frequency (dB)
Frequency (dB)
14/26
TS4995
Electrical characteristics
Figure 44. CMRR vs. common mode input
voltage
Figure 45. CMRR vs. common mode input
voltage
20
20
Vic = 200mVpp
F = 217Hz
Vic = 200mVpp
F = 217Hz
10
10
Cb = 1
μ
F
Cb = 0
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
RL
≥
8
Ω
RL
≥ 8Ω
Tamb = 25°C
Tamb = 25°C
Vcc=5V
Vcc=5V
Vcc=2.6V
Vcc=2.6V
Vcc=3.3V
Vcc=3.3V
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
Common Mode Input Voltage (V)
Common Mode Input Voltage (V)
Figure 46. Current consumption vs. power
supply voltage
Figure 47. Differential DC output voltage vs.
common mode input voltage
5.0
G = 6dB
No loads
4.5
Tamb = 25°C
Tamb = 25°C
0.1
0.01
1E-3
1E-4
1E-5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
Vcc=2.6V
Vcc=3.3V
Vcc=5V
0
1
2
3
4
5
0
1
2
3
4
5
6
Common Mode Input Voltage (V)
Power Supply Voltage (V)
Figure 48. Current consumption vs. standby Figure 49. Current consumption vs. standby
voltage voltage
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
Standby mode=0V
Standby mode=0V
Standby mode=3.3V
Standby mode=5V
Vcc = 5V
No load
Tamb = 25
Vcc = 3.3V
No load
°
C
Tamb = 25
°
C
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
0.0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
3.2
Standby Voltage (V)
Standby Voltage (V)
15/26
Electrical characteristics
TS4995
Figure 50. Current consumption vs. standby Figure 51. Frequency response
voltage
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
8
7
6
5
4
3
2
1
0
Cin=4.7μF
Standby mode=0V
Standby mode=2.6V
Cin=330nF
Vcc = 5V
Gain = 6dB
Vcc = 2.6V
No load
Tamb = 25°C
ZL = 8
Ω + 500pF
Tamb = 25
°
C
20
20k
10000
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6
100
1000
Frequency (Hz)
Standby Voltage (V)
Figure 52. Frequency response
Figure 53. Frequency response
8
8
Cin=4.7
μ
F
Cin=4.7μF
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
Cin=330nF
Cin=330nF
Vcc = 3.3V
Gain = 6dB
Vcc = 2.6V
Gain = 6dB
ZL = 8 + 500pF
Tamb = 25
ZL = 8
Ω
+ 500pF
Ω
Tamb = 25
°
C
°C
20
20k
20
20k
10000
100
1000
Frequency (Hz)
10000
100
1000
Frequency (Hz)
Figure 54. SNR vs. power supply voltage with Figure 55. SNR vs. power supply voltage with
unweighted filter A-weighted filter
120
118
116
114
112
110
108
106
104
102
100
120
118
116
114
112
110
108
106
104
102
100
F = 1kHz
G = 6dB
Cb = 1μF
THD + N < 0.7%
Tamb = 25°C
F = 1kHz
G = 6dB
Cb = 1μF
THD + N < 0.7%
Tamb = 25°C
RL=16Ω
RL=8Ω
RL=8Ω
RL=16Ω
2.5
3.0
3.5
4.0
4.5
5.0
5.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
Power Supply Voltage (V)
Power Supply Voltage (V)
16/26
TS4995
Application information
4
Application information
4.1
Differential configuration principle
The TS4995 is a monolithic full-differential input/ output power amplifier with fixed +6 dB
gain. The TS4995 also includes a common mode feedback loop that controls the output bias
value to average it at V /2 for any DC common mode input voltage. This allows maximum
CC
output voltage swing, and therefore, to maximize the output power. Moreover, as the load is
connected differentially instead of single-ended, output power is four times higher for the
same power supply voltage.
The advantages of a full-differential amplifier are:
●
●
●
Very high PSRR (power supply rejection ratio)
High common mode noise rejection
Virtually no pop and click without additional circuitry, giving a faster start-up time
compared to conventional single-ended input amplifiers
●
●
Easier interfacing with differential output audio DAC
No input coupling capacitors required due to common mode feedback loop
In theory, the filtering of the internal bias by an external bypass capacitor is not necessary.
However, to reach maximum performance in all tolerance situations, it is recommended to
keep this option.
4.2
Common mode feedback loop limitations
As explained previously, the common mode feedback loop allows the output DC bias voltage
to be averaged at V /2 for any DC common mode bias input voltage.
CC
Due to the V limitation of the input stage (see Table 4 on page 5), the common mode
IC
feedback loop can fulfil its role only within the defined range.
4.3
Low frequency response
The input coupling capacitors block the DC part of the input signal at the amplifier inputs. C
in
and R form a first-order high pass filter with -3 dB cut-off frequency.
in
1
FCL
=
(Hz)
2× π×Rin ×Cin
Note:
The input impedance for the TS4995 is typically 20kΩ and there is tolerance around this
value.
From Figure 56, you can easily establish the C value required for a -3 dB cut-off frequency.
in
17/26
Application information
TS4995
Figure 56. -3 dB lower cut-off frequency vs. input capacitance
All gain setting
Tamb=25
°
C
100
Minimum Input
Impedance
Typical Input
Impedance
10
Maximum Input
Impedance
0.1
0.5
1
Input Capacitor Cin (μF)
4.4
Power dissipation and efficiency
Assumptions:
●
●
Load voltage and current are sinusoidal (V and I
)
out
out
Supply voltage is a pure DC source (V
)
CC
The output voltage is:
Vout = Vpeak sinωt (V)
and
Vout
------------
(A)
Iout
=
RL
and
2
Vpeak
--------------------
(W)
Pout
=
2RL
Therefore, the average current delivered by the supply voltage is:
Equation 1
Vpeak
----------------
(A)
Icc
= 2
AVG
πRL
The power delivered by the supply voltage is:
Equation 2
Psupply = VCC IccAVG (W)
18/26
TS4995
Application information
Therefore, the power dissipated by each amplifier is:
= P - P (W)
P
diss
supply
out
2 2VCC
----------------------
Pdiss
=
P
out–Pout
π RL
and the maximum value is obtained when:
and its value is:
∂Pdiss
--------------------
= 0
∂Pout
Equation 3
2Vcc2
π2RL
Pdissmax =
(W)
Note:
This maximum value is only dependent on the power supply voltage and load values.
The efficiency is the ratio between the output power and the power supply:
Equation 4
Pout
πVpeak
4VCC
------------------ --------------------
η=
=
Psupply
The maximum theoretical value is reached when V
= V , so:
CC
peak
π
η= ---- = 78.5%
4
The maximum die temperature allowable for the TS4995 is 125° C. However, in case of
overheating, a thermal shutdown set to 150° C, puts the TS4995 in standby until the
temperature of the die is reduced by about 5° C.
To calculate the maximum ambient temperature T
allowable, you need to know:
amb
●
●
●
The power supply voltage, V
CC
The load resistor value, R
L
The package type, R
thja
2
Example: V =5 V, R =8 Ω, R
= 100° C/W (100 mm copper heatsink).
CC
L
thja-flipchip
Using the power dissipation formula given above in Equation 3, this gives a result of:
= 633mW
P
dissmax
T
is calculated as follows:
amb
Equation 5
T
amb= 125° C – Rthja × Pdissmax
Therefore, the maximum allowable value for T is:
amb
T
= 125-100x0.633=61.7° C
amb
19/26
Application information
TS4995
4.5
Decoupling of the circuit
Two capacitors are needed to correctly bypass the TS4995: a power supply bypass
capacitor C and a bias voltage bypass capacitor C .
S
b
The C capacitor has particular influence on the THD+N at high frequencies (above 7 kHz)
S
and an indirect influence on power supply disturbances. With a value for C of 1 µF, one can
S
expect THD+N performance similar to that shown in the datasheet.
In the high frequency region, if C is lower than 1 µF, then THD+N increases and
S
disturbances on the power supply rail are less filtered.
On the other hand, if C is greater than 1 µF, then those disturbances on the power supply
S
rail are more filtered.
The C capacitor has an influence on the THD+N at lower frequencies, but also impacts
b
PSRR performance (with grounded input and in the lower frequency region).
4.6
Wake-up time tWU
When the standby is released to put the device ON, the bypass capacitor C is not charged
b
immediately. Because C is directly linked to the bias of the amplifier, the bias will not work
b
properly until the C voltage is correct. The time to reach this voltage is called the wake-up
b
time or t
and is specified in Table 4 on page 5, with C =1 µF. During the wake-up phase,
WU
b
the TS4995 gain is close to zero. After the wake-up time, the gain is released and set to its
nominal value.
If C has a value different from 1 µF, then refer to the graph in Figure 57 to establish the
b
corresponding wake-up time.
Figure 57. Startup time vs. bypass capacitor
15
Tamb=25°C
Vcc=5V
10
5
Vcc=3.3V
Vcc=2.6V
0
0.0
0.4
0.8
1.2
1.6
2.0
Bypass Capacitor Cb (
μ
F)
20/26
TS4995
Application information
4.7
Shutdown time
When the standby command is set, the time required to put the two output stages in high
impedance and the internal circuitry in shutdown mode is a few microseconds.
Note:
In shutdown mode, the Bypass pin and V +, V - pins are shorted to ground by internal
in in
switches. This allows a quick discharge of C and C .
b
in
4.8
Pop performance
Due to its fully differential structure, the pop performance of the TS4995 is close to perfect.
However, due to mismatching between internal resistors R , R , and external input
in
feed
capacitors C , some noise might remain at startup. To eliminate the effect of mismatched
in
components, the TS4995 includes pop reduction circuitry. With this circuitry, the TS4995 is
close to zero pop for all possible common applications.
In addition, when the TS4995 is in standby mode, due to the high impedance output stage in
this configuration, no pop is heard.
4.9
Single-ended input configuration
It is possible to use the TS4995 in a single-ended input configuration. However, input
coupling capacitors are needed in this configuration. The schematic diagram in Figure 58
shows an example of this configuration.
21/26
Application information
TS4995
Figure 58. Typical single-ended input application
VCC
Cs1
1uF
TS4995 FlipChip
TS4995
Ve
P1
Cin1
Vo-
3
Vin-
7
5
330nF
Cin2
Vo+
1
8
Vin+
8 Ohms
+
330nF
BYPASS
BIAS
1uF
STBY
STDBY
STDBY MODE
Cbypass1
VCC
22/26
TS4995
Package information
5
Package information
To meet environmental requirements, STMicroelectronics offers these devices in
®
ECOPACK packages. These packages have a lead-free second level interconnect. The
category of second level interconnect is marked on the package and on the inner box label,
in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an STMicroelectronics
trademark. ECOPACK specifications are available at: www.st.com.
Figure 59. 9-bump flip-chip package mechanical drawing
1.63 mm
– Die size: 1.63mm x 1.63mm ± 30µm
– Die height (including bumps): 600µm
– Bumps diameter: 315µm ±50µm
– Bump diameter before reflow: 300µm ±10µm
– Bumps height: 250µm ±40µm
– Die height: 350µm ±20µm
1.63 mm
0.5mm
– Pitch: 500µm ±50µm
0.5mm
– Coplanarity: 60µm max
∅ 0.25mm
600µm
Figure 60. Tape and reel schematics
1.5
4
1
1
A
A
8
Die size X + 70µm
4
All dimensions are in mm
User direction of feed
23/26
Package information
Figure 61. Pin out (top view)
Gnd
TS4995
Figure 62. Marking (top view)
E
VO-
Bypass
VIN+
VO+
7
6
9
5
Stdby
VIN-
4
3
8
1
95
2
YWW
VCC
Stdby Mode
– Balls are underneath
24/26
TS4995
Ordering information
6
Ordering information
Table 7.
Order code
TS4995EIJT
Order code
Temperature
Package
Packing
Marking
range
-40° C to +85° C
Lead free flip chip 9
Tape & reel
95
7
Revision history
Table 8.
Date
Document revision history
Revision
Changes
1-Jun-2006
1
2
Final datasheet.
Additional information for 4Ω load.
25-Oct-2006
Modified Figure 60: Tape and reel schematics to correct die
orientation.
25-Mar-2008
3
25/26
TS4995
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26/26
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