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參數(shù)資料
| 型號： | CA3256 |
| 廠商： | Intersil Corporation |
| 英文描述： | 25MHz, BiMOS Analog Video Switch and Amplifier |
| 中文描述： | 高達(dá)25MHz，BiMOS模擬視頻開關(guān)和放大器 |
| 文件頁數(shù)： | 5/11頁 |
| 文件大?。?/td> | 389K |
| 代理商： | CA3256 |
8-5
Test Circuits
Application Information
CMOS analog switches are available in a wide variety of
forms, and have been known and used for some time. There
are a number of advantages to using the CMOS transmis-
sion gate as a switch:
Ideal Suitability to Series Cascade Arrangements
Simple Multiple Parallel Input Switching Arrangements
No Bipolar Junctions and, Hence, No Offset
Very Low Power Consumption
Wide Signal-Swing Capability
Fast Multiplexing and Video Switching
Wide Bandwidth
Low R
ON
Channel Resistance
Bidirectional Signal Handling
An Integrated Video-Switch Amplifier
Commonly, integrated video-switch amplifiers have been fabri-
cated in the bipolar technology using differential amplifiers in a
current-switching mode. In this form, two differential pairs are
needed for two input-signal sources. The handling of multiple
sources is very much more complex. The advantages of the
CMOS video-switch amplifier have already been noted. While
the bipolar video switch has high output drive and switching
speed as advantages, the price is high in voltage offset and cur-
rent drain. The integrated device solution that is offered here is
in the use of the BiMOS technology, where both the CMOS and
bipolar processes complement each other to provide CMOS
switching with bipolar amplifiers. The BiMOS process allows
several CMOS switches to be coupled to a bipolar drive-ampli-
fier in the same process to exploit the best of two technologies.
Other advantages are gained when the BiMOS process is
used for an IC video-switch amplifier design. The BiMOS
process calls for a P-substrate and, therefore, isolated N-epi-
taxial wells can be built for both N and P channel parts. The
boats provide for better isolation of the N and P channels.
The N and P wells in a transmission-gate cell can be
switched between source and rail; therefore, they have a
smaller body effect on both N and P devices, which results in
better gain linearity. Where desired, oxide capacitors are
available for bipolar amplifier compensation.
CA3256 Video-Switch Amplifier
The Block Diagram shows the functional diagram of the
CA3256, which consists of five MOS channels, each com-
prising a three-element T-switch. The output of the five
switches is made common and fed into the input of a bipolar
CONTROL INPUTS (CHANNEL SELECT)
12
+12 V
10K
1K
10K
15
OUTPUT
AMP
9
+
FEEDBACK
FEEDBACK
SWITCH
AMP
OUT
11
10
2
1.1K
1.1K
1.1K
1.1K
4
GND
17
1
3
13
IN 1
IN 2
IN 3
IN 4
IN/OUT 5
A
B
6
C
16
18
ENABLE
5
14
BIAS
REG
8
+12 V
2
1
3
4
LLC ENABLE
AND CHAN 1-4
SELECT
7
TG-1
TG-2
TG-4
TG-3
TG-5
V+
V-
V
BIAS
(V- +5V)
V
LED
FIGURE 1. CA3256 TEST CIRCUIT (DIP PINOUT)
CA3256
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PDF描述 |
|---|---|
| CA3256E | 25MHz, BiMOS Analog Video Switch and Amplifier |
| CA3256M | 25MHz, BiMOS Analog Video Switch and Amplifier |
| CA3260AEZ | 4MHz, BiMOS Operational Amplifier with MOSFET Input/CMOS Output |
| CA3260EZ | 4MHz, BiMOS Operational Amplifier with MOSFET Input/CMOS Output |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CA3256 WAF | 制造商:Harris Corporation 功能描述: |
| CA3256E | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| CA3256M | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| CA3256M96 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Single Video Amplifier |
| CA3257E | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Consumer IC |
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