STV5728 데이터 시트보기 (PDF) - STMicroelectronics
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STV5728 Datasheet PDF : 11 Pages
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STV5728
BLOCK DIAGRAM
H1 S P
1
2
3
H2 S P
S P HEADS
4
60dB
60dB
REC
PB
H2LP
H1LP
H1 S P
H2 S P
R e c ord
Amplifica tor
28
22kΩ
27
8.2kΩ
+5V
26
Rrcy
25
Rrcc
5
CCOM
6
LP HEADS
7
H2LP
8
9
H1LP
10
CCOM2
11
HIFI HEADS
12
H1FM
24
60dB
Playba ck
AGC
60dB
De te c tor
Record Re ference
Current (FM)
70dB Record AGC
23
22
R ADJ
21
20
CAGC
19
18
Rfmin
17
13
14
H2FM
70dB
STV5728
PB REC MUTE
H1FM OFF
H2FM ON
16
+5V
15
S WR
S WH
S WM
VCC
YRE C
CREC
CPB
YP B
TRIV (ATR)
ENV
Envelope Comp
FMRE C
FMPB
S WFMH
VCCFM
FUNCTIONAL DESCRIPTION
Record Mode (Video)
Thecurrent input applied on RECINPin 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
2/11
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
beentaken to speedup commutationfromPlayback
to Record and from Record to Playback, avoiding
spikes through the loads (the rotary transformers).
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