파트넘버.co.kr BA7745FS 데이터시트 PDF


BA7745FS 반도체 회로 부품 판매점

VCR Hi-Fi audio signal REC / PB amplifier with flying-erase oscillator



ROHM Semiconductor 로고
ROHM Semiconductor
BA7745FS 데이터시트, 핀배열, 회로
Video ICs
VCR Hi-Fi audio signal REC / PB
amplifier with flying-erase oscillator
BA7745FS
The BA7745FS has the recording and playback amplifiers required for Hi-Fi VCR signal processing, and also con-
tains a flying-erase oscillator. The recording system uses a constant-current amplifeir with AGC to eliminate the need
to adjust the recording current, and ensure stable operation as the head wears. The IC also features REC MUTE and
OVER REC functions .
The playback system has a high-gain preamplifier, a low-offset head switch, a VCA and an EP-gain amplifier. The
flying-erase oscillator has low 2nd and 3rd harmonic distortion, and when connected to an external driver large out-
put current can be obtained.
A H / L control system eliminates the need for special power supplies for the recording and playback systems. The
IC has low power consumption, and comes in a compact 32-pin SSOP-P package that requires little area on the
PCB. It will improve the reliability and performance of your designs while reducing external component requirements.
Applications
VCRs
Features
The low-noise playback amplifier has a total gain of
83dB (Typ.). Designed for VHS-bandoperation with
low external parts count. It has two built-in circuits for
Hi-Fi VCR operation.
2) The circuit has been designed to suppress head-
switching noise.
3) Built-in EP / SP gain switching function that boosts
the playback gain by 5dB.
4) Built-in VCA for easy playback output adjustment.
5) High-output recording amplifier for audio FM record-
ing.
6) Constant-current drive provides stable recording
characteristics when the load (head impedance) is
fluctuating.
7) Built-in recording level AGC eliminates the need to
adjust recording current.
8) Built-in low-pass filter limits the input bandwidth of
the recording amplifier.
9) Built-in OVER REC recording current amplifier
function and REC MUTE function that stops record-
ing output.
10) Built-in high-frequency oscillator for use with flying
erase function.
11) Record / playback switching can be done directly
via the system controller, and consumes litlle
power.
12) Possible to construct a high-performance audio
system by pairing this chip with a Hi-Fi-audio signal
processing IC.
1


BA7745FS 데이터시트, 핀배열, 회로
Video ICs
Block diagram
REC / PB CTRL
REC AGC FILTER
REC CURRENT SENSE
REC OUT
MAIN GND
PRE AC – FB CH1
PRE IN CH1
PRE GND
PRE IN CH2
PRE AC – FB CH2
REC + B CH2
REC + B CH1
VCC REC + B
N.C.
FE VCC
FE OUT
BA7745FS
REC NF
REC MIX IN
OVER REC CTRL
REC MUTE CTRL
VCC
VCA CTRL
PRE OUT
EP / SP CTRL
HSWPIN
N.C.
FE LEVEL
FE CTRL
FE3
FE2
FE1
FE GND
Absolute maximum ratings (Ta = 25°C)
Parameter
Symbol
Limits
Unit
Power supply voltage
Power dissipation
PB / REC system 7.0
VCC
FE system
12.5
Pd 1000
V
mW
Operating temperature
Topr
– 10 ~ + 70
°C
Storage temperature
Tstg – 55 ~ + 125
When mounted on a 90mm × 50mm × 1.6mm glass epoxy board, reduced by 10mW for
each increase in Ta of 1°C over 25°C.
°C
2




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제조업체: ROHM Semiconductor

( rohm )

BA7745FS amplifier

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BA7745FS

VCR Hi-Fi audio signal REC / PB amplifier with flying-erase oscillator - ROHM Semiconductor