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PDF TS472 Data sheet ( Hoja de datos )
| Número de pieza | TS472 | |
| Descripción | Very low noise microphone preamplifier | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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TS472
Very low noise microphone preamplifier with
2.0V bias output and active low standby mode
Features
■ Low noise: 10nV/√Hz typ. equivalent input
noise @ F = 1kHz
■ Fully differential input/output
■ 2.2V to 5.5V single supply operation
■ Low power consumption @20dB: 1.8mA
■ Fast start up time @ 0dB: 5ms typ.
■ Low distortion: 0.1% typ.
■ 40kHz bandwidth regardless of the gain
■ Active low standby mode function (1μA max)
■ Low noise 2.0V microphone bias output
■ Available in flip-chip lead-free package and in
QFN24 4x4mm package
■ ESD protection (2kV)
Description
The TS472 is a differential-input microphone
preamplifier optimized for high-performance, PDA
and notebook audio systems.
This device features an adjustable gain from 0dB
to 40dB with excellent power-supply and
common-mode rejection ratios. In addition, the
TS472 has a very low-noise microphone bias
generator of 2V.
It also includes a complete shutdown function,
with active low standby mode.
Applications
■ Video and photo cameras with sound input
■ Sound acquisition & voice recognition
■ Video conference systems
■ Notebook computers and PDAs
Flip-chip - 12 bumps
Pin Connections (top view)
C1 C2
OUTPUT
BIAS
GS
IN+ IN-
STDBY
VCC
OUT+
OUT-
GND BYPASS
QFN24
Pin Connection (top view)
September 2006
Rev 4
1/24
www.st.com
24
1 page  
TS472
3
Absolute maximum ratings
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Table 3. Absolute maximum ratings
Symbol
VCC
Vi
Toper
Tstg
Tj
Rthja
ESD
ESD
Parameter
Supply voltage (1)
Input voltage
Operating free air temperature range
Storage temperature
Maximum junction temperature
Thermal resistance junction to ambient:
Flip-chip
QFN24
Human body model
Machine model
Lead temperature (soldering, 10sec)
Value
6
-0.3 to VCC+0.3
-40 to + 85
-65 to +150
150
180
110
2
200
250
Unit
V
V
°C
°C
°C
°C/W
kV
V
°C
1. All voltages values are measured with respect to the ground pin.
Table 4. Operating conditions
Symbol
Parameter
Value
Unit
VCC
A
VSTBY
Top
Rthja
Supply voltage
2.2 to 5.5
Typical differential gain (GS connected to 4.7kΩ or bias)
20
Standby voltage input:
Device ON
Device OFF
1.5 ≤VSTBY ≤VCC
GND ≤VSTBY ≤0.4
Operational free air temperature range
-40 to +85
Thermal resistance junction to ambient:
Flip-chip
QFN24
150
60
V
dB
V
°C
°C/W
5/24
5 Page 
TS472
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Figure 14. Differential output PSRR vs.
frequency
0
V =200mV , Inputs grounded
RIPPLE
PP
V =3V, Minimum Gain, Cin=1μF, T =25°C
-20 CC
AMB
Figure 15. Differential output PSRR vs.
frequency
0
V =200mV , Inputs grounded
RIPPLE
PP
V =3V, Gain=20dB, Cin=1μF, T =25°C
-20 CC
AMB
-40 Cb=1μF
No Cb
Cb=100nF
-60
-40
-60
Cb=1μF
No Cb
-80
-100
50 100
1k
Frequency (Hz)
10k 20k
-80
-100
50 100
Cb=100nF
1k
Frequency (Hz)
10k 20k
Figure 16. Single-ended output PSRR vs.
frequency
Figure 17. Equivalent input noise voltage
density
0
Vripple=200mVpp
-10 Inputs grounded
Cb=1μF
-20 Cin=100nF
Tamb=25°C
-30
-40
-50
-60
-70
-80
50
Vcc=2.2V
100
Vcc=3V
Vcc=5V
1000
Frequency (Hz)
10000 20k
1000
100
10
1
10
Cin=100nF
R =100Ω
EQ
T =25°C
AMB
100 1k 10k
Frequency (Hz)
100k
Figure 18. Δgain vs. power supply voltage
Figure 19. Δgain vs. ambient temperature
1.0
F=1kHz
0.8 Vin=5mV
Tamb=25°C
0.6
Maximum Gain
0.4
0.2
0.0
-0.2
-0.4
2.2
Minimum Gain
Gain=20dB
34
Power Supply Voltage (V)
5
5.5
0.50
0.25
F=1kHz
V =5mV
IN
0.00
-0.25
-0.50
-0.75
-1.00
-40
Maximum Gain
Gain=20dB
Minimum Gain
-20 0 20 40 60
Ambient Temperature (°C)
80
11/24
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet TS472.PDF ] | |
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