CA3256E Harris Corporation, CA3256E Datasheet

CA3256E

Manufacturer Part Number

CA3256E

Description

Manufacturer

Harris Corporation

Datasheet

1.CA3256E.pdf (11 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

CA3256E

Manufacturer:

SIEMENS

Quantity:

8 824

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Download datasheet (393Kb)

January 1999

CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.

Features

• 5 Multiplex Video Channels

• 4 LED Channel Indicator Outputs

• Wideband Video Ampliﬁer . . . . . . . . 25MHz Unity Gain

• Adjustable Video Ampliﬁer Gain

• High Signal-Drive Capability

• Video Multiplex Switch

• 75 Video Ampliﬁer/Line Driver

• Video Signal-Level Control

• Monitor Switching Control

• TV/CATV Audio/Video Switch

• Video Signal Adder/Fader Control

Part Number Information

Pinouts

Applications

CA3256E

CA3256M

PART NUMBER

- 1 Independent Channel

- 4 Channels with Enable

Harris Corporation 1999

CONTROL C

Semiconductor

FEEDBACK

AMP OUT

ENABLE

LED 4

GND

IN 3

IN 4

V-

RANGE (

-40 to 85

TEMP.

TOP VIEW

CA3256

(PDIP)

18 Ld PDIP

20 Ld SOIC

PACKAGE

CONTROL B

IN 2

CONTROL A

IN 1

V+

IN/OUT 5

LED 1

LED 2

LED 3

E18.3

M20.3

PKG.

NO.

8-1

Description

The CA3256 BiMOS analog video switch has ﬁve 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 ampliﬁer 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 conﬁgured in a “T” design to minimize

feedthrough. When the switch is off, the shunt or center of

the “T” is grounded.

The ampliﬁer has high input impedance to minimize the R

transmission gate insertion loss. The ampliﬁer output imped-

ance is typically 5

The ampliﬁer can directly drive a nominal 75

to provide line-to-line video switching. The gain of the ampli-

ﬁer is programmable by different feedback resistor values

between pins 8 and 9. Compensation may also be used

between these pins for an optimally ﬂat frequency response.

An internal regulated 5V bias reference with temperature

compensation permits stable direct-coupled output drive and

minimizes DC offset during signal switching.

CONTROL C

FEEDBACK

AMP OUT

ENABLE

LED4

LED3

GND

IN3

IN4

Video Switch and Ampliﬁer

V-

in a complementary symmetry output.

CA3256

TOP VIEW

25MHz, BiMOS Analog

CA3256

(SOIC)

File Number

CONTROL B

IN2

CONTROL A

IN1

V+

IN/OUT5

LED1

LED2

coaxial cable

1769.5

Related parts for CA3256E

CA3256E Summary of contents

Page 1

... Video Ampliﬁer/Line Driver • Video Signal-Level Control • Monitor Switching Control • TV/CATV Audio/Video Switch • Video Signal Adder/Fader Control Part Number Information TEMP. o PART NUMBER RANGE ( C) CA3256E - PDIP CA3256M - SOIC Pinouts CA3256 (PDIP) TOP VIEW IN 3 ...

Page 2

Block Diagram V+ 14 BINARY ENABLE LOGIC TO 6 LEVEL CONV. WITH ENABLE CONTROL Switch Control Logic CHANNEL NUMBER (1-4) ...

Page 3

Absolute Maximum Ratings DC Supply Voltage Range ( 18V Control Input Voltage Range, All Inputs . . ...

Page 4

Electrical Speciﬁcations (See Figure 1), Unless Otherwise Speciﬁed INPUTS PARAMETERS PIN 15 PIN 17 PIN 1 Supply Current LED Dual Supply Current +7V, ...

Page 5

Test Circuits LLC ENABLE AND CHAN 1-4 SELECT IN/OUT 5 13 ENABLE CONTROL INPUTS (CHANNEL SELECT) Application Information CMOS analog switches are available ...

Page 6

The T-switch, together with the input impedance of the buffer, is typically 10k , and has an inser- tion loss of approximately 0.8dB. The T-switch was designed to handle input signal with low distortion. The ...

Page 7

F 100K 100K 2.2 F CHANNEL 1 15 INPUT INPUTS SHOWN 3 CHAN 1-4 2.2 F CHANNEL 5 13 INPUT/ OUTPUT 75 ENABLE 6 CHANNEL 1-4 4. OUT FIGURE ...

Page 8

V = 200mV , AT LOW FREQUENCY 0dB REF. EQUAL IN P-P o 1.13 x GAIN -10 1 0.01 0.1 FREQUENCY (MHz) FIGURE 4A. CLOSED LOOP RESPONSE WITH COMPENSATION CAPACITOR, ...

Page 9

IN 1 TG-1 GEN ENABLE AND CHAN 1-4 SELECT ENABLE 6 FIGURE 5. TYPICAL APPLICATION WITH DC-COUPLED INPUT AND OUTPUT, AND OFFSET ...

Page 10

V 75 FIGURE 7A. 2pF 1 40MHz (1.2X GAIN PEAK AT 25MHz 200mV OUT P-P FIGURE 7C FEEDBACK 9 150 FIGURE 7E. 6pF ...

Page 11

Any combination of switch input circuits can be conﬁgured with multiple, parallel, line-drive outputs. The video switch ampliﬁer circuit of Figure 8 illustrates how the CA3256 may be conﬁgured in pairs to provide an 8-to-1 video switch ampliﬁer using a ...

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