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CA3256M Datasheet(PDF) 6 Page - Harris Corporation

Part # CA3256M
Description  25MHz, BiMOS Analog Video Switch and Amplifier
Download  11 Pages
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Manufacturer  HARRIS [Harris Corporation]
Direct Link  http://www.harris.com
Logo HARRIS - Harris Corporation

CA3256M Datasheet(HTML) 6 Page - Harris Corporation

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8-6
buffer amplifier. The T-switch, together with the input
impedance of the buffer, is typically 10k
Ω, and has an inser-
tion loss of approximately 0.8dB. The T-switch was designed
to handle up to 3VP-P input signal with low distortion. The
T-switches of the CA3256 conform to a break-before-make
format; hence, shorting to ground is eliminated.
The amplifier is programmable for gain and, typically, can
provide a gain of 1 into a 75
Ω load or a gain of 5 into a 1kΩ
load. The maximum output signal swing with linearity is
greater than 5VP-P for (V+ to V-) greater than or equal to
12V, while the maximum output current is approximately
20mA. The amplifier has base-current compensation to
reduce offset and a temperature compensated 5V zener ref-
erenced bias. Other features include LED-selector indicators
for channels 1 through 4. The fifth channel is independently
selectable for use as a separate input or output in parallel
with any on channel, and may be used as a monitor, or for
pass-through, signal summing, or parallel distribution.
In the application, the user has the option to specify V- = -5V
for the switch and a ground reference for the amplifier input
and output. Alternatively, the CA3256 may be used with a
single +12V supply. The logic select for channels 1 through 4
is controlled by the A, B and Inhibit lines with ground to V+
logic switching. The logic threshold is approximately
(V+ - V-)/2 referenced to ground. DC coupling may also be
used at the output (when V- is returned to a -5V supply). For
the circuit of Figure 3, AC coupling is used at the output and
input. The switching bias arrangement shown provides for
stable bias across each switch when in the off position to
minimize transients when the input is switched.
Typical Applications
TG-1
10K
V- +5V
BIAS
8
-5V
V-
+7V TO +12V
V+
100K
100K
AB
ENABLE
CHANNEL
1-4
4.7K
4.7K
4.7K
GND
1K
10K
LED INDICATOR CHANNEL 4
LED INDICATOR CHANNEL 3
LED INDICATOR CHANNEL 2
LED INDICATOR CHANNEL 1
AMPLIFIER
TO CABLE
OUTPUT
OUTPUT
AMP
14
5
CHANNEL 1
INPUT
CHANNEL 5
INPUT/
OUTPUT
2 OF 5
INPUTS
SHOWN
TG-2
TG-3
VLED
75
4.7K
C
SELECT
CHANNEL
5
WHERE AMPLIFIER GAIN:
RF = 9kΩ
i.e., FOR AV = 1.8
REG
5
14
+
9
15
1
-
RF
75
12
2
3
17
1
3
TG-4
LLC
ENABLE
AND
CHAN 1-4
SELECT
4
TG-5
13
6
16
18
7
4
2
A
V
1
R
F
1K
+
10K
----------------------
+
x0.9
=
11
10
SELECT
CHANNEL
1-4
100K
OUT
FIGURE 2. TYPICAL APPLICATION WITH DIRECT-COUPLED OUTPUT AND V- = -5V (DIP PINOUT)
CA3256


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