STV5728 Datasheet, PDF (1/11 Pages) STMicroelectronics – 4-HEAD VIDEO AND 2-HEADS HIFI AUDIO PLAYBACK AND RECORD AMPLIFIER FOR VCR

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
2
H2SP
3
I_OUTSP
4
CCOM
5
I_OUTLP
6
H2LP
7
GNDLP
8
H1LP
9
CCOM2
10
I_OUTFM
11
H1FM
12
GNDFM
13
H2FM
14
27
SWIN
26
V_CC
25
RECIN
24
CPB
23
GND
22
YPB
21
TRIV
20
ENV
19
CAGC
18
FMRIN
17
FMPB
16
SWFMH
15
V_CCFM
May 1997
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