TL1593C

3-CHANNEL SAMPLE-AND-HOLD CIRCUIT

SOCS027B – APRIL 1987 – REVISED JULY 1991

Copyright

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POST OFFICE BOX 655303

CCD Image Sensors

Applications

Circuits

Immunity to Switching Transients

description

The TL1593C is a three-channel sample-and-hold integrated circuit designed for use in processing video

signals generated by TI virtual-phase CCD image sensors. It can be used with one-, two-, and three-channel

color and monochrome TI virtual-phase CCDs.

Each sample-and-hold channel consists of a differential-input buffer, a digitally controlled switch, and an output

buffer that has high impedance. Separate supply and ground pins are provided for the analog and digital

sections to ensure optimum isolation. Internal-hold capacitors are included to reduce the external parts count.

The differential inputs allow the amplifier return pin of the imager to be connected to CIN of the sample-and-hold

circuit to obtain common-mode rejection for antiblooming clock transients in the CCD. The analog inputs should

be capacitively coupled from the CCD outputs to ensure optimum performance.

The TL1593C is supplied in a 16-pin plastic package and is characterized for operation from 0

°C to 70°C.

This device contains circuits to protect its inputs and outputs against damage due to high static voltages or electrostatic fields. These

circuits have been qualified to protect this device against electrostatic discharges (ESD) of up to 2 kV according to MIL-STD-883C,

Method 3015; however, precautions should be taken to avoid application of any voltage higher than maximum-rated voltages to these

high-impedance circuits. During storage or handling, the device leads should be shorted together or the device should be placed in

conductive foam. In a circuit, unused inputs should always be connected to an appropriate logic voltage level, preferably either VCC or ground.

Specific guidelines for handling devices of this type are contained in the publication

Guidelines for Handling Electrostatic-Discharge-Sensitive

(ESDS) Devices and Assemblies available from Texas Instruments.

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AIN1

CIN1

AIN2

CIN2

AIN3

CIN3

ANLG GND

S/H1

S/H2

S/H3

OUT1

OUT2

OUT3

DIG GND

NS PACKAGE

(TOP VIEW)

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.