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3/1/01

SPT9693

GENERAL INFORMATION

The SPT9693 is an ultrahigh-speed dual voltage com-

parator. It offers tight absolute characteristics. The device

has differential analog inputs and complementary logic

outputs compatible with ECL systems. The output stage is

adequate for driving terminated 50 ohm transmission

lines.

The SPT9693 has a complementary latch enable control

for each comparator. Both should be driven by standard

ECL logic levels.

A common mode voltage range of –3 V to +8 V is achieved

by a proprietary JFET input design, which requires a

grounds for each comparator to achieve high crosstalk

rejection.

Single-channel operation can be accomplished by floating

all pins (including the ground and supply pins) of the un-

used comparator. Power dissipation during single-channel

operation is 50% of the dissipation during dual-channel

operation.

This comparator offers the following improvements over

existing devices:

• Ultra low input bias current and input current offset

• Common mode voltage of –3 to +8 V

• Short propagation delays

• Excellent input and output rejection between

comparator channels

• Improved input protection reliability due to JFET input

stage design

All of these combined features produce high-performance

products with timing stability and repeatability for large

system precision.

Figure 1 – Internal Function Diagram

CLK

BUF

LE

LE

LATCH

ECL

OUT

REF

1

REF

2

GND

PRE

AMP

+

–

+IN

–IN

Q

Q