LT1215CS8 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LT1215CS8' PDF : 20 Pages View PDF
LT1215/LT1216
APPLICATI S I FOR ATIO
Comparator Applications
Sometimes it is desirable to use an op amp as a compara-
tor. When operating the LT1215/LT1216 on a single 3.3V
or 5V supply, the output interfaces directly with most TTL
and CMOS logic.
The response time of the LT1215/LT1216 is a strong
function of the amount of input overdrive as shown in the
following photos. These amplifiers are unity-gain stable
op amps and not fast comparators, therefore, the logic
being driven may oscillate due to the long transition time.
The output can be speeded up by adding 20mV or more of
hysteresis (positive feedback), but the offset is then a
function of the input direction.
LT1215 Comparator Response (+)
20mV, 10mV, 5mV, 2mV Overdrives
LT1215 Comparator Response (–)
20mV, 10mV, 5mV, 2mV Overdrives
4
4
2
2
0
100
0
VS = 5V
RL = ∞
5µs/DIV
1215/16 AI01
0
100
0
VS = 5V
RL = ∞
5µs/DIV
1215/16 AI02
SI PLIFIED SCHE ATIC
I1
I2
I3
I4
Q3 Q4
–IN
Q1
+IN
Q2
Q7
Q8
Q9
Q5 Q6
CI
V+
I5
I6
CM
CF
Q10
Q11
RF
I7
BIAS
Q13
Q14 Q15
OUT
Q12
Q16
CO
I8
V–
1215/16 SS
15
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