LT1214 Linear Technology Corporation, LT1214 Datasheet - Page 15

• Manufacturer Part Number: LT1214
• Description: 28mhz, 12v/?s, Single Supply Dual And Quad Precision Op Amps
• Manufacturer: Linear Technology Corporation

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
Q7
Q9
4
2
0
0
V
R
S
L
= 5V
=
Q8
20mV, 10mV, 5mV, 2mV Overdrives
LT1213 Comparator Response (+)
O
I
1
–IN
U
CHE
S
C
I
Q1
I FOR ATIO
U
I
2
W
Q3
5 s/DIV
Q5
A
Q4
TIC
I
Q6
3
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
M
100
4
2
0
0
V
R
S
L
= 5V
=
Q12
20mV, 10mV, 5mV, 2mV Overdrives
I
6
LT1213 Comparator Response (–)
BIAS
C
O
Q13
I
8
5 s/DIV
LT1213/LT1214
Q14
1213/14 SS
Q16
Q15
OUT
V
V
–
+
1213/14 AI02
15