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STV5715

ADVANCED 2-HEAD PLAY-BACK AND RECORD AMPLIFIER FOR VCR

STMicroelectronics 

STV5715

BLOCK DIAGRAM

20

19

18

17

16

15

14

13

12

11

STV5715

LSP

SW H

HL

SW M

HLP

TRIVADJ

1

2

3

4

5

6

7

8

9

10

FUNCTIONAL DESCRIPTION

STV5715 is intended for 2 heads VCR applications.

It includes all the electrical functions necessary to

achieve play-back and record processing for VHS

and S-VHS applications (10MHz bandwidth).

High performancetechnologyallows very low noise

levels (current and voltage), which are frequency

independant in all the frequency range. In play-

back mode a special feature suppresses the DC

offset when switching the two channels. Optimized

play-back output stage gives to the STV5715 large

capability to drive directly a coaxial cable in order

to reduce number of external components.

Two play-back outputs are availabe : one, dedi-

cated to Chroma processing, is a 60dB voltage

amplifier output, the other, dedicatedto Luma proc-

essing, is phase opposite signal with a constant AC

output level of 200mVPP at 3.8MHz signal.

A tracking information for video signal (TRIV) is

Luma amplitude proportional and allows automatic

phase correction. The transfer function has a gain

of 2.5dB higher when a LP channel is selected.

Adding to this, a gain control bloc allows to modify

the gain (± 6dB) of the TRIV function for all the

channels by applying a bias on pin TRIVADJ.

An automatic scanning of record supply voltage

permits STV5715 automatically switching either in

play-back or in record mode. The switching thresh-

old voltage is fixed to a value which forbids high

current peaking through the heads.

During play-back mode, record output is grounded

via an internal transistor and during record mode

preamplifiers are turned off.

There is one output current for two recording

heads, the DC current and the AC characteristics

can be very precisely controlled with accurate ex-

ternal resistors. If recommended resistances are

used, a ± 3% transconductanceaccuracy is guar-

anteed.

STV5715 is fully protected against ESD.

ABSOLUTE MAXIMUM RATINGS

Symbol

VCC

VREC

TJ

Toper

Power Supply Voltage

Power Supply Voltage Record

Junction Temperature

Operating Temperature

Parameter

2/9

Value

6

15

+150

0, +70

Unit

V

V

oC

oC

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