TL1593C 3-CHANNEL SAMPLE-AND-HOLD CIRCUIT

SOCS027B - APRIL 1987 - REVISED JULY 1991

features

• Designed for Use With TI Virtual-Phase CCD Image Sensors
• Supports Both Color and Monochrome Applications
• Contains Three Separate Sample-and-Hold Circuits
• Has Differential Input With 11-dB Gain
• 5-MHz Sampling Rate on Each Channel
• Has Separate Analog and Digital Supplies for 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 with high input 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 the CIN input 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 V_CC 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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