CA3338AD View Datasheet(PDF) - Intersil

Part Name

Description

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CA3338AD

CMOS Video Speed, 8-Bit, 50 MSPS, R2R D/A Converters

Intersil 

CA3338, CA3338A

TABLE 1. OUTPUT VOLTAGE vs INPUT CODE AND VREF

VREF+

VREF -

STEP SIZE

5.12V 5.00V 4.608V 2.56V 2.50V

0

0

0 -2.56V -2.50V

0.0200V 0.0195V 0.0180V 0.0200V 0.0195V

Input Code

111111112=FFHEX 5.1000V 4.9805V 4.5900V 2.5400V 2.4805V

111111102=FEHEX 5.0800 4.9610 4.5720 2.5200 2.4610

•

•

•

100000012=81HEX

100000002=80HEX

011111112=7FHEX

•

•

•

2.5800

2.5600

2.5400

2.5195

2.5000

2.4805

2.3220 0.0200 0.0195

2.3040 0.0000 0.0000

2.2860 - 0.0200 -0.0195

000000012=01HEX 0.0200 0.0195 0.0180 -2.5400 -2.4805

000000002=00HEX 0.0000 0.0000 0.0000 -2.5600 -2.5000

Applications

The output of the CA3338 can be resistively divided to match a

doubly terminated 50Ω or 75Ω line, although peak-to-peak

swings of less than 1V may result. The output magnitude will

also vary with the converter’s output impedance. Figure 5

shows such an application. Note that because of the HCT input

structure, the CA3338 could be operated up to +7.5V VDD and

VREF+ supplies and still accept 0V to 5V CMOS input voltages.

If larger voltage swings or better accuracy is desired, a high

speed output buffer, such as the HA-5033, HA-2542, or

CA3450, can be employed. Figure 6 shows a typical

application, with the output capable of driving ±2V into

multiple 50Ω terminated lines.

Operating and Handling Considerations

HANDLING

All inputs and outputs of CMOS devices have a network for

electrostatic protection during handling. Recommended

handling practices for CMOS devices are described in

AN6525. “Guide to Better Handling and Operation of CMOS

Integrated Circuits.”

OPERATING

OPERATING VOLTAGE

During operation near the maximum supply voltage limit,

care should be taken to avoid or suppress power supply

turn-on and turn-off transients, power supply ripple, or

ground noise; any of these conditions must not cause the

absolute maximum ratings to be exceeded.

INPUT SIGNALS

To prevent damage to the input protection circuit, input

signals should never be greater than VDD nor less than VSS.

Input currents must not exceed 20mA even when the power

supply is off.

UNUSED INPUTS

A connection must be provided at every input terminal. All

unused input terminals must be connected to either VCC or

GND, whichever is appropriate.

8

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