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
separate negative power supply (AV
EE
).
The dual comparators have separate AV
CC
, AV
EE
, and
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
Q
+IN
IN
+
PRE
AMP
LATCH
ECL
OUT
Q
REF
1
CLK
BUF
REF
2
AV
EE
V
CC
GND
LE
LE
SPT9693
6
3/1/01
CADEKA [ CADEKA MICROCIRCUITS LLC. ]
