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부품번호 | TDA1220B 기능 |
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기능 | AM-FM QUALITY RADIO | ||
제조업체 | ST Microelectronics | ||
로고 | |||
전체 18 페이지수
TDA1220B
AM-FM QUALITY RADIO
The TDA1220B is a monolithic integrated circuit in
a 16-lead dual in-line package.
It is intended for quality receivers produced in large
quantities.
The functions incorporated are:
AM SECTION
– Preamplifier and double balanced mixer
– One pin local oscillator
– IF amplifier with internal AGC
– Detector and audio preamplifier
FM SECTION
– IF amplifier and limiter
– Quadrature detector
– Audio preamplifier
The TDA1220B is suitable up to 30MHz AM and for
FM bands (including 450KHz narrow band) and
features:
– Very constant characteristics (3V to 16V)
– High sensitivity and low noise
– Very low tweet
DIP-16 Plastic
(0.25)
ORDERING NUMBER : TDA 1220BK
– Sensitivity regulation facility (*)
– High recovered audio signal suited for stereo
decoders and radio recorders
– Very simple DC switching of AM-FM
– Low current drain
– AFC facility
(*) Maximum AM sensitivity can be reduced by means of a resistor
(5 to 12KΩ) between pin 4 and ground.
BLOCK DIAGRAM
March 1993
1/18
TDA1220B
Figure 1. Test circuit
Figure 2. PC board and component layout (1:1 scale) of the test circuit
4/18
4페이지 TDA1220B
APPLICATION INFORMATION (continued)
FM Section
IF Amplifier and limiter
The 10.7 MHz IF signal from the ceramic filter is amplified and limited by a chain of four differential stages.
Pin 16 is the amplifier input and has a typical input impedance of 6.5 KW in parallel with 14 pF at 10.7 MHz.
Bias for the first stage is available at pin 14 and provides 100% DC feedback for stable operating conditions.
Pin 15 is the second input to the amplifier and is decoupled to pin 14, which is grounded by a 20 nF capacitor.
An RLC network is connected to the amplifier output and gives a 90° phase shift (at the IF centre frequency)
between pins 13 and 12. The signal level at pin 13 is about 150 mV rms
FM Detector
The circuit uses a quadrature detector and the choise of component values is determined by the acceptable
level of distortion at a given recovered audio level.
With a double tuned network the linearity improves (distortion is reduced) and the phase shift can be
optimized; however this leads to a reduction in the level of the recovered audio. A satisfactory compromise
for most FM receiver applications is shown in the test circuit.
Care shoul be taken with the physical layout.
The main recommandations are:
• Locate the phase shift coil as near as possible to pin 13.
• Shunt pins 14 and 16 with a low value resistor (between 56Ω and 330Ω).
• Ground the decoupling capacitor of pin 14 and the 10.7 MHz input filter at the same point.
AM-FM Switching
AM-FM switching is achieved by applying a DC voltage at pin 13, to switch the internal reference.
Typical DC voltages (refer to the test circuit)
Pins 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Unit
AM 9 1.4 9 1.4 1.4 8.4 9 0.7 1.9 9 0 0.1 0.1 8.5 8.5 8.5 V
FM 9 0.02 9 0.02 0.02 8.5 9 0 1.7 9 0 9 9 8 8 8 V
7/18
7페이지 | |||
구 성 | 총 18 페이지수 | ||
다운로드 | [ TDA1220B.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 |
TDA1220A | AM-FM QUALITY RADIO | SGS-Ates |
TDA1220B | AM-FM QUALITY RADIO | ST Microelectronics |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |