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STV5728 Datasheet(PDF) 2 Page - STMicroelectronics

Part No. STV5728
Description  4-HEAD VIDEO AND 2-HEADS HIFI AUDIO PLAYBACK AND RECORD AMPLIFIER FOR VCR
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STV5728 Datasheet(HTML) 2 Page - STMicroelectronics

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Record Mode (Video)
The current input applied on RECIN Pin is amplified
througha transconductanceamplifier. Special care
has been taken to speed up commutation from
Playback to Record and from Record to Playback,
avoiding spikes through the loads (the rotary trans-
formers). The recording current level in LP mode is
0.9 time the value of SP one.
Playback Mode (FM HIFI)
Signals applied on H1FM and H2FM input Pins will
be amplified by 70dB voltage gain. IOUTFM Pin is
AC short-circuited to ground by CCOM1. The input
signal can be selected through SWFMH input and
the correspondingoutput signal will be available on
Pin FMPB.
Record Mode (HIFI)
The current input applied on FMRIN Pin is amplified
through an Automatic Gain Control amplifier. The
recording level can be adjusted thanks to the RADJ
resistance connected to TRIV Pin. Special care has
been taken to speedup commutation fromPlayback
to Record and from Record to Playback, avoiding
spikes through the loads (the rotary transformers).
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9
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19
60dB
60dB
De tector
Re cord
Amplifica tor
STV5728
H1SP
H2SP
S P HEADS
CCOM
SWR
SWH
SWM
V
CC
YREC
CREC
CPB
YPB
TRIV (ATR)
+5V
Rrcy
Rrcc
REC
PB
H2LP
H1LP
H1SP
H2SP
H2LP
H1LP
LP HEADS
60dB
60dB
21
Playba ck
AGC
22
23
24
20
25
26
27
28
CAGC
ENV
Enve lope Comp
8.2k
22k
11
12
13
14
CCOM2
H1FM
H2FM
70dB
70dB
HIFI HEADS
Re cord Re ference
Current (FM)
R
ADJ
FMREC
Rfmin
18
FMPB
17
SWFMH
16
V
CCFM
15
+5V
Re cord AGC
H1FM
OFF
H2FM
ON
PB
REC MUTE
BLOCK DIAGRAM
FUNCTIONAL DESCRIPTION
STV5728
2/11


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