LT1213 Linear Technology, LT1213 Datasheet - Page 15

• Manufacturer Part Number: LT1213
• Description: 28MHz/ 12V/us/ Single Supply Dual and Quad Precision Op Amps
• Manufacturer: Linear Technology

Comparator Applications
Sometimes it is desirable to use an op amp as a compara-
tor. When operating the LT1213/LT1214 on a single 3.3V
or 5V supply, the output interfaces directly with most TTL
and CMOS logic.
The response time of the LT1213/LT1214 is a strong
function of the amount of input overdrive as shown in the
I S PLI I F ED S
A
PPLICATI
W
100
4
2
0
0
Q7
Q9
V
R
S
L
= 5V
=
20mV, 10mV, 5mV, 2mV Overdrives
LT1213 Comparator Response (+)
Q8
O
I
U
1
–IN
CHE
S
C
I
I FOR ATIO
Q1
U
W
I
2
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
5 s/DIV
Q3
A
Q5
TIC
Q4
I
3
Q6
W
Q2
I
4
+IN
1213/14 AI01
U
Q10
I
5
C
F
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.
Q11
I
7
R
F
C
100
M
4
2
0
0
V
R
S
L
= 5V
=
Q12
20mV, 10mV, 5mV, 2mV Overdrives
LT1213 Comparator Response (–)
I
6
BIAS
C
O
Q13
5 s/DIV
I
8
LT1213/LT1214
Q14
1213/14 SS
Q15
Q16
V
OUT
V
–
+
1213/14 AI02
15