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STMicroelectronics Electronic Components Datasheet

STV5725 Datasheet

4-HEAD PLAYBACK AND RECORD AMPLIFIER

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STV5725
4-HEAD PLAYBACK AND RECORD AMPLIFIER FOR VCR
. ONE 5V POWER SUPPLY
. PLAYBACK/RECORD MODE SELECTION
THROUGH A LOGIC INPUT
. PINNING COMPATIBLE WITH STV5727 AND
STV5728
. SO20 PACKAGE
PLAYBACK MODE
. LOW NOISE AND WIDE BAND AMPLIFIERS
FOR 4 HEADS
. AUTOMATIC OFFSET CANCELLATION
BETWEEN THE 2 SELECTED HEADS
. ONE PLAYBACK OUTPUT WITH AGC
. ONE PLAYBACK OUTPUT (CONSTANT GAIN)
. ONE OUTPUT FOR AUTOMATIC VIDEO
TRACKING
. SP/LP ENVELOPE COMPARATOR OUTPUT
.RECORD MODE
TRANSCONDUCTANCE AMPLIFIER
PRELIMINARY DATA
function of the selected input signal amplitude is
present on Pin TRIV.
Record Mode
The current input applied on RECIN Pin is amplified
through a 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.
SO20
(Plastic Micropackage)
DESCRIPTION
STV5725 is intended for 4 heads VCR applications.
It includes all the electrical functions necessary to
achieve play-back and record processing for VHS
applications.
Record or Playback Mode 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.
Playback Mode
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
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
ORDER CODE : STV5725
PIN CONNECTIONS
H1SP
GNDSP
H2SP
IOUTSP
CCOM
IOUTLP
H2LP
GNDLP
H1LP
NC
1
2
3
4
5
6
7
8
9
10
20 SWR
19 SWIN
18 VCC
17 RECIN
16 CPB
15 GND
14 YPB
13 TRIV
12 ENV
11 CAGC
April 1996
This is advance information on a new product now in development or undergoing evaluation. Details are subject to change without no tice.
1/7


STMicroelectronics Electronic Components Datasheet

STV5725 Datasheet

4-HEAD PLAYBACK AND RECORD AMPLIFIER

No Preview Available !

STV5725
BLOCK DIAGRAM
H1 S P
1
60dB
2
3
H2 S P
SP HEADS
4
CCOM
5
6
LP HEADS
7
H2LP
8
60dB
60dB
9
H1LP
10
60dB
S TV5725
REC
PB
H2LP
H1LP
H1 S P
H2 S P
Re cord
Amplifica tor
20
22k
19 8.2k
+5V
18
Rrcy
17 Rrcc
16
Playback 15
AGC
14
S WR
S WH
S WM
VCC
YRE C
CREC
CPB
YPB
De te c tor
13
12
11
CAGC
TRIV (ATR)
ENV
Envelope Comp
ABSOLUTE MAXIMUM RATINGS
Symbol
VCC
Tj
Toper
Power Supply Voltage
Junction Temperature
Operating Temperature
Parameter
Value
6
150
0, +70
Unit
V
oC
oC
THERMAL DATA
Symbol
Rth (j-a)
Parameter
Junction-ambient Thermal Resistance (IC solded on the PC board)
Value
90
Unit
oC/W
RECOMMENDED OPERATING CHARACTERISTICS
Symbol
VCC
CAGC
CCOM
Parameter
Power Supply
Capacitance on Pin CAGC
Decoupling Capacitor
Min.
4.75
4.7
4.7
Typ.
5
22
470
Max.
5.25
Unit
V
nF
nF
2/7


Part Number STV5725
Description 4-HEAD PLAYBACK AND RECORD AMPLIFIER
Maker STMicroelectronics
Total Page 7 Pages
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