STV5728

4-HEAD VIDEO AND 2-HEADS HIFI AUDIO

PLAYBACK AND RECORD AMPLIFIER FOR VCR

May 1997

SO28

(Plastic Package)

ORDER CODE : STV5728

.

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

FOR

VIDEO

.

AGC AMPLIFIER FOR HIFI

DESCRIPTION

STV5728 is intended for 4 heads VCR applications

with HIFI. It includes all the electrical functions nec-

essary to 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.

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

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.

I

OUTLP

SWR

SWIN

V

CC

RECIN

CPB

TRIV

1

2

3

4

5

6

7

8

9

10

28

27

26

25

24

23

22

21

20

19

ENV

CAGC

H1SP

GNDSP

H2SP

H2LP

CCOM

I

OUTSP

GNDLP

CCOM2

H1LP

GND

YPB

11

12

13

14

18

17

16

15

I

OUTFM

H1FM

GNDFM

H2FM

FMPB

SWFMH

V

CCFM

FMRIN

PIN CONNECTIONS

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