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부품번호 | TS472 기능 |
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기능 | Very low noise microphone preamplifier | ||
제조업체 | STMicroelectronics | ||
로고 | |||
전체 24 페이지수
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
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www.st.com
24
Typical application schematic
2 Typical application schematic
Figure 1 shows a typical application schematic for the TS472.
Figure 1. Application schematic (flip-chip)
www.DataSheTeSt44U7.c2om
Table 2. External component descriptions
Components
Functional description
Cin+, Cin-
Cout+, Cout-
Input coupling capacitors that block the DC voltage at the amplifier input
terminal.
Output coupling capacitors that block the DC voltage coming from the
amplifier output terminal (pins C2 and D2) and determine Lower cut-off
frequency.
Rout+, Rout-
Rpos, Rneg
Cs
Cb
C1, C2
Output load resistors used to charge the output coupling capacitors Cout.
These output resistors can be represented by an input impedance of a
following stage.
Polarizing resistors for biasing of a microphone.
Supply bypass capacitor that provides power supply filtering.
Bypass pin capacitor that provides half-supply filtering.
Low pass filter capacitors allowing to cut the high frequency.
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4페이지 TS472
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Note:
Table 7.
Gain
(dB)
0
20
40
Differential RMS noise voltage
Input referred noise voltage
(μVRMS)
Unweighted filter A-weighted filter
15 10
3.4 2.3
1.4 0.9
Output noise voltage
(μVRMS)
Unweighted filter A-weighted filter
15 10
34 23
141 91
Table 8.
Bias output RMS noise voltage
Cout Unweighted filter
(μF) (μVRMS)
15
10 2.2
A-weighted filter
(μVRMS)
4.4
1.2
Table 9.
Gain
(dB)
0
20
40
SNR (signal to noise ratio), THD+N < 0.5%
Unweighted filter
(dB)
A-weighted filter
(dB)
VCC=2.2V
75
82
70
VCC=3V
76
83
72
VCC=5.5V
76
83
74
VCC=2.2V
79
89
80
VCC=3V
80
90
82
VCC=5.5V
80
90
84
Unweighted filter = 20Hz ≤F ≤20kHz
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7페이지 | |||
구 성 | 총 24 페이지수 | ||
다운로드 | [ TS472.PDF 데이터시트 ] |
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구매 문의 | 일반 IC 문의 : 샘플 및 소량 구매 ----------------------------------------------------------------------- IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한 광범위한 전력 반도체를 판매합니다. 전력 반도체 전문업체 상호 : 아이지 인터내셔날 사이트 방문 : [ 홈페이지 ] [ 블로그 1 ] [ 블로그 2 ] |
부품번호 | 상세설명 및 기능 | 제조사 |
TS472 | Very low noise microphone preamplifier | STMicroelectronics |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |