|
|
Teilenummer | TS472 |
|
Beschreibung | Very low noise microphone preamplifier | |
Hersteller | STMicroelectronics | |
Logo | ||
Gesamt 24 Seiten www.DataSheet4U.com
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
Electrical characteristics
4 Electrical characteristics
www.DataSheTeSt44U7.c2om
Table 5.
Symbol
Electrical characteristics at VCC = 3V
with GND = 0V, Tamb = 25°C (unless otherwise specified)
Parameter
Min. Typ.
Max.
en
THD+N
Vin
BW
Equivalent input noise voltage density
REQ=100Ω at 1KHz
Total harmonic distortion + noise
20Hz ≤F ≤ 20kHz, Gain=20dB, Vin=50mVRMS
Input voltage, Gain=20dB
Bandwidth @ -3dB
Bandwidth @ -1dB
pin A3, B3 floating
10
0.1
10 70
40
20
Overall output voltage gain (Rgs variable):
G Minimum gain, Rgs infinite
Maximum gain, Rgs=0
-3 -1.5 0
39.5 41 42.5
Zin Input impedance referred to GND
80 100 120
RLOAD Resistive load
10
CLOAD Capacitive load
100
ICC Supply current, Gain=20dB
1.8 2.4
ISTBY Standby current
1
PSRR
Power supply rejection ratio, Gain=20dB, F=217Hz,
Vripple=200mVpp, inputs grounded
Differential output
Single-ended outputs,
-70
-46
Unit
---n---V-----
Hz
%
mVRMS
kHz
dB
kΩ
kΩ
pF
mA
μA
dB
Table 6.
Symbol
Bias output: VCC = 3V, GND = 0V, Tamb = 25°C (unless otherwise specified)
Parameter
Min. Typ. Max. Unit
Vout
Rout
Iout
PSRR
No load condition
Output resistance
Output bias current
Power supply rejection ratio, F=217Hz,
Vripple=200mVpp
1.9 2 2.1
80 100 120
2
70 80
V
W
mA
dB
6/24
6 Page Electrical characteristics
www.DataSheTeSt44U7.c2om
Figure 20. Maximum input voltage vs. gain,
THD+N<1%
Figure 21. Maximum input voltage vs. power
supply voltage, THD+N<1%
150
100
50
0
0
V =5.5V
CC
T =25°C
AMB
F=1kHz
THD+N<1%
V =3V
CC
V =2.2V
CC
10 20
Gain (dB)
30
40
140
T =25°C, F=1kHz, THD+N<1%
AMB
120
Gain=0dB
100
80
60
Gain=30dB Gain=20dB
40 Gain=40dB
20
0
2.2
34
Power Supply Voltage (V)
5
5.5
Figure 22. THD+N vs. input voltage
10
GS floating
GS=bias
1
Figure 23. THD+N vs. input voltage
10
GS floating
GS=bias
1
0.1
GS grounded
Tamb=25°C, Vcc=3V, F=100Hz,
0.01 Cb=1μF, RL=10kΩ , BW=100Hz-120kHz
1E-3
0.01
Input Voltage (V)
0.1
Figure 24. THD+N vs. input voltage
10
GS floating
GS=bias
1
0.1
GS grounded
Tamb=25°C, Vcc=5V, F=100Hz,
0.01 Cb=1μF, RL=10kΩ , BW=100Hz-120kHz
0.3 1E-3
0.01
Input Voltage (V)
0.1
Figure 25. THD+N vs. input voltage
10
GS floating
GS=bias
1
0.3
0.1 0.1
GS grounded
GS grounded
Tamb=25°C, Vcc=3V, F=1kHz,
0.01 Cb=1μF, RL=10kΩ , BW=100Hz-120kHz
Tamb=25°C, Vcc=5V, F=1kHz,
0.01 Cb=1μF, RL=10kΩ , BW=100Hz-120kHz
1E-3
0.01
Input Voltage (V)
0.1
0.3
1E-3
0.01
Input Voltage (V)
0.1
0.3
12/24
12 Page | ||
Seiten | Gesamt 24 Seiten | |
PDF Download | [ TS472 Schematic.PDF ] |
Teilenummer | Beschreibung | Hersteller |
TS472 | Very low noise microphone preamplifier | STMicroelectronics |
Teilenummer | Beschreibung | Hersteller |
CD40175BC | Hex D-Type Flip-Flop / Quad D-Type Flip-Flop. |
Fairchild Semiconductor |
KTD1146 | EPITAXIAL PLANAR NPN TRANSISTOR. |
KEC |
www.Datenblatt-PDF.com | 2020 | Kontakt | Suche |