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STV5715 Datasheet(PDF) 2 Page - STMicroelectronics

Part No. STV5715
Description  ADVANCED 2-HEAD PLAY-BACK AND RECORD AMPLIFIER FOR VCR
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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STV5715 Datasheet(HTML) 2 Page - STMicroelectronics

   
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TRIVADJ
LSP
SW H
SW M
HLP
1
234
5678
10
HL
9
STV5715
BLOCK DIAGRAM
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
Parameter
Value
Unit
VCC
Power Supply Voltage
6
V
VREC
Power Supply Voltage Record
15
V
TJ
Junction Temperature
+150
oC
Toper
Operating Temperature
0, +70
oC
STV5715
2/9


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