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CA3256 Datasheet, PDF (1/11 Pages) Harris Corporation – 25MHz, BiMOS Analog Video Switch and Amplifier | |||
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January
Semiconductor
1999
NO
Call
CRoeErnOCetrOBmaSMlaOAiMl:pLEpEcNlTeiDcnEaEtaPtDipoRpRnO@sEDP1hUL-aC8Ar0rTCi0sE-.4cM4o2Em-N7T747
CA3256
25MHz, BiMOS Analog
Video Switch and Ampliï¬er
[ /Title
(CA32
56)
/Sub-
ject
(25MH
z,
BiMO
S Ana-
log
Video
Switch
and
Ampli-
ï¬er)
/Autho
r ()
/Key-
words
(Har-
ris
Semi-
con-
ductor,
4x1,
video
cross-
point
switch,
multi-
plexer
multi-
plexor,
cable
driver,
5x1,
moni
tor out-
put,
adjust-
able
gain,
Features
Description
⢠5 Multiplex Video Channels
- 1 Independent Channel
- 4 Channels with Enable
⢠4 LED Channel Indicator Outputs
⢠Wideband Video Ampliï¬er . . . . . . . . 25MHz Unity Gain
⢠Adjustable Video Ampliï¬er Gain
⢠High Signal-Drive Capability
Applications
⢠Video Multiplex Switch
⢠75⦠Video Ampliï¬er/Line Driver
⢠Video Signal-Level Control
⢠Monitor Switching Control
⢠TV/CATV Audio/Video Switch
⢠Video Signal Adder/Fader Control
Part Number Information
PART NUMBER
CA3256E
CA3256M
TEMP.
RANGE (oC)
PACKAGE
-40 to 85 18 Ld PDIP
-40 to 85 20 Ld SOIC
PKG.
NO.
E18.3
M20.3
The CA3256 BiMOS analog video switch has ï¬ve channels
of CMOS multiplex switching for general-purpose video-
signal control. One of four CMOS channels may be selected
in parallel with channel 5. The CMOS switches are inputs to
the video ampliï¬er but may be used in bilateral switching
between channels 1 to 4 and channel 5. The analog
switches of channels 1 to 4 are digitally controlled with logic
level conversion and binary decoding to select 1 of 4
channels. The enable function controls channels 1 to 4 but
does not affect channel 5. LED output drivers are selected
with the channel 1-to-4 switch selection to indicate the ON-
channel. Channel 5 may be used as a monitor output for
data or signal information on channels 1 to 4. The
transmission gate switches shown in the block diagram of
the CA3256 are conï¬gured in a âTâ design to minimize
feedthrough. When the switch is off, the shunt or center of
the âTâ is grounded.
The ampliï¬er has high input impedance to minimize the RON
transmission gate insertion loss. The ampliï¬er output imped-
ance is typically 5⦠in a complementary symmetry output.
The ampliï¬er can directly drive a nominal 75⦠coaxial cable
to provide line-to-line video switching. The gain of the ampli-
ï¬er is programmable by different feedback resistor values
between pins 8 and 9. Compensation may also be used
between these pins for an optimally ï¬at frequency response.
An internal regulated 5V bias reference with temperature
compensation permits stable direct-coupled output drive and
minimizes DC offset during signal switching.
Pinouts
CA3256
(PDIP)
TOP VIEW
IN 3 1
LED 4 2
IN 4 3
GND 4
V- 5
ENABLE 6
CONTROL C 7
FEEDBACK 8
AMP OUT 9
18 CONTROL B
17 IN 2
16 CONTROL A
15 IN 1
14 V+
13 IN/OUT 5
12 LED 1
11 LED 2
10 LED 3
CA3256
(SOIC)
TOP VIEW
IN3 1
LED4 2
IN4 3
GND 4
V- 5
ENABLE 6
CONTROL C 7
FEEDBACK 8
AMP OUT 9
LED3 10
20 CONTROL B
19 IN2
18 CONTROL A
17 NC
16 IN1
15 V+
14 IN/OUT5
13 NC
12 LED1
11 LED2
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright © Harris Corporation 1999
8-1
File Number 1769.5
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