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PDF STV5725 Data sheet ( Hoja de datos )
| Número de pieza | STV5725 | |
| Descripción | 4-HEAD PLAYBACK AND RECORD AMPLIFIER | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de STV5725 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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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
1 page  
INPUTS/OUTPUTS EQUIVALENT INTERNAL DIAGRAMS
Figure 1
Figure 2
VCC
H1SP/H2SP/H1LP/H2LP
pins 1/3/7/9
VCC
54kΩ
IOUTSP / IOUTLP
Pins 4/6
VCC
CCOM 5
STV5725
13.5V
66Ω
Figure 3
VCC
CAGC 11
VCC
Figure 5
VCC
TRIV 13
600Ω
VCC
Figure 4
VCC
VCC
VCC
ENV 12
1500Ω
1500Ω
Figure 6
VCC
VCC
YPB/CPB
Pins 14/16
Figure 7
VCC
VCC
RECIN 17
5/7
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet STV5725.PDF ] | |
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