LT1011/LT1011A
Voltage Comparator
FeaTures
DescripTion
The LT®1011 is a general purpose comparator with sig-
nificantly better input characteristics than the LM111.
Although pin compatible with the LM111, it offers four
times lower bias current, six times lower offset voltage
and five times higher voltage gain. Offset voltage drift,
a previously unspecified parameter, is guaranteed at
15µV/°C. Additionally, the supply current is lower by
a factor of two with no loss in speed. The LT1011 is
several times faster than the LM111 when subjected to
large overdrive conditions. It is also fully specified for DC
parameters and response time when operating on a single
5V supply. The LT1011 retains all the versatile features of
the LM111, including single 3V to 1ꢀV supply operation,
and a floating transistor output with 50mA source/sink
capability. It can drive loads referenced to ground, nega-
tive supply or positive supply, and is specified up to 50V
n
Pin Compatible with LM111 Series Devices
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Guaranteed Max 0.5mV Input Offset Voltage
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Guaranteed Max 25nA Input Bias Current
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Guaranteed Max 3nA Input Offset Current
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Guaranteed Max 250ns Response Time
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Guaranteed Min 200,000 Voltage Gain
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50mA Output Current Source or Sink
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30V Differential Input Voltage
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Fully Specified for Single 5V Operation
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Available in ꢀ-Lead PDIP and SO Packages
applicaTions
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SAR A/D Converters
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Voltage-to-Frequency Converters
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Precision RC Oscillator
–
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Peak Detector
between V and the collector output. A differential input
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Motor Speed Control
voltage up to the full supply voltage is allowed, even with
1ꢀV supplies, enabling the inputs to be clamped to the
supplies with simple diode clamps.
n
Pulse Generator
n
Relay/Lamp Driver
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Typical applicaTion
10µs 12-Bit A/D Converter
3.9k
Response Time vs Overdrive
R1
1k
15V
LM329
7V
500
450
FULL-SCALE
TRIM
*R2 AND R4
SHOULD TC TRACK
–15V
R2*
6.49k
R3
6.98k
400
350
0.001µF
15V
INPUT
0V TO 10V
300
250
5V
FALLING
OUTPUT
6012
12-BIT
D/A CONVERTER
R4*
2.49k
R5
1k
200
150
100
50
RISING
OUTPUT
+
R6
LT1011A
820Ω
–
PARALLEL
OUTPUTS
PARALLEL
OUTPUTS
0
0.1
1
10
100
SERIAL OUTPUT
OVERDRIVE (mV)
1011 TA02
7475
LATCH
D
AM2504
SAR REGISTER
5V
CC
S
E
S
CP
START
CLOCK f = 1.4MHz
1011 TA01
1011afe
1
For more information www.linear.com/LT1011