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STV5728 Datasheet

4-HEAD VIDEO AND 2-HEADS HIFI AUDIO PLAYBACK AND RECORD AMPLIFIER FOR VCR

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STV5728
4-HEAD VIDEO AND 2-HEADS HIFI AUDIO
PLAYBACK AND RECORD AMPLIFIER FOR VCR
. ONE 5V POWER SUPPLY
. PLAYBACK/RECORD MODE SELECTION
THROUGH A LOGIC INPUT
. PINNING COMPATIBLE WITH STV5725 AND
STV5727
. SO28 PACKAGE
PLAYBACK MODE
. LOW NOISE AND WIDE BAND AMPLIFIERS
FOR 4 VIDEO HEADS
. AUTOMATIC OFFSET CANCELLATION
BETWEEN THE 2 SELECTED HEADS
. ONE PLAYBACK OUTPUT WITH AGC
. ONE PLAYBACK OUTPUT (60dB CONSTANT
GAIN)
. ONE OUTPUT FOR AUTOMATIC VIDEO
TRACKING
. SP/LP ENVELOPE COMPARATOR OUTPUT
. LOW NOISE AMPLIFIERS FOR 2 HIFI HEADS
. HIFI OUTPUT GAIN (70dB)
RECORD MODE
. TRANSCONDUCTANCE AMPLIFIER
VIDEO
. AGC AMPLIFIER FOR HIFI
FOR
voltage between the two selected heads is auto-
matically cancelled after 32 switching head cycles.
A constant output signal will be available on Pin
YPB thanks to an AGC function (Automatic Gain
Control). The time constant of the AGC is deter-
mined by the capacitor value connected to CAGC
Pin. For Automatic Tracking, a signal which is a
function of the selected input signal amplitude is
present on Pin TRIV. For Trick Mode, a signal
resulting from the comparison of the input signal
amplitude is available on ENVC Pin.
SO28
(Plastic Package)
ORDER CODE : STV5728
PIN CONNECTIONS
H1SP
1
28 SWR
DESCRIPTION
STV5728 is intended for 4 heads VCR applications
with HIFI. It includes all the electrical functions nec-
essaryto achieveplay-back and record processing.
Record or PlaybackMode can be selected through
SWR Pin. SWH allows to select the video head
input (H1SP or H2SP, H1LP or H2LP), while SWM
will select the mode SP or LP. The SWFMH will
select the FM input heads in Playbackand will mute
the HIFI record amplifier in Record Mode.
Playback Mode (Video)
Signals applied on H1SP, H2SP, H1LP and H2LP
input pins will be amplified by 60dB voltage gain.
IOUTSP and IOUTLP Pins are AC short-circuited to
ground. The input signal can be selected through
SWH and SWM inputs and the corresponding out-
put signal will be available on Pin CPB. The offset
GNDSP
H2SP
IOUTSP
CCOM
IOUTLP
H2LP
GNDLP
H1LP
CCOM2
IOUTFM
H1FM
GNDFM
H2FM
2
3
4
5
6
7
8
9
10
11
12
13
14
27 SWIN
26 VCC
25 RECIN
24 CPB
23 GND
22 YPB
21 TRIV
20 ENV
19 CAGC
18 FMRIN
17 FMPB
16 SWFMH
15 VCCFM
May 1997
1/11


STMicroelectronics Electronic Components Datasheet

STV5728 Datasheet

4-HEAD VIDEO AND 2-HEADS HIFI AUDIO PLAYBACK AND RECORD AMPLIFIER FOR VCR

No Preview Available !

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
22k
27 8.2k
+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).


Part Number STV5728
Description 4-HEAD VIDEO AND 2-HEADS HIFI AUDIO PLAYBACK AND RECORD AMPLIFIER FOR VCR
Maker ST Microelectronics
Total Page 11 Pages
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