LT1011 Datasheet, PDF (1/16 Pages) Linear Technology – Voltage Comparator

FEATURES
s _{Pin Compatible with LM111 Series Devices}
s _{Guaranteed Max 0.5mV Input Offset Voltage}
s _{Guaranteed Max 25nA Input Bias Current}
s _{Guaranteed Max 3nA Input Offset Current}
s _{Guaranteed Max 250ns Response Time}
s _{Guaranteed Min 200,000 Voltage Gain}
s _{50mA Output Current Source or Sink}
s _{±30V Differential Input Voltage}
s _{Fully Specified for Single 5V Operation}
U
APPLICATIO S
s _{SAR A/D Converters}
s _{Voltage-to-Frequency Converters}
s _{Precision RC Oscillator}
s _{Peak Detector}
s _{Motor Speed Control}
s _{Pulse Generator}
s _{Relay/Lamp Driver}
, LTC and LT are registered trademarks of Linear Technology Corporation.
LT1011/LT1011A
Voltage Comparator
DESCRIPTIO
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. These parametric improvements allow the
LT1011 to be used in high accuracy (≥12-bit) systems
without trimming. In a 12-bit A/D application, for instance,
using a 2mA DAC, the offset error introduced by the
LT1011 is less than 0.5LSB. The LT1011 retains all the
versatile features of the LM111, including single 3V to
±18V supply operation, and a floating transistor output
with 50mA source/sink capability. It can drive loads refer-
enced to ground, negative supply or positive supply, and
is specified up to 50V between V^– and the collector output.
A differential input voltage up to the full supply voltage is
allowed, even with ±18V supplies, enabling the inputs to
be clamped to the supplies with simple diode clamps.
TYPICAL APPLICATIO
10µs 12-Bit A/D Converter
R1
1k
FULL-SCALE
TRIM
3.9k
LM329
7V
R2*
R3
15V
6.49k
6.98k
0.001µF
20 14
15
16
15V
–15V
17
19
*R2 AND R4
SHOULD TC TRACK
INPUT
0V TO 10V
5V
6012
12-BIT
13
D/A CONVERTER
18
PARALLEL
OUTPUTS
12 11 10 9 8 7 6 5 4 3 2 1
PARALLEL
OUTPUTS
R4*
R5
2.49k
1k
2₊
R6
820Ω
LT1011A
3_–
7
24
5V
4 5 6 7 8 9 16 17 18 19 20 21
AM2504
SAR REGISTER
E
S
D
CC
CP S
SERIAL OUTPUT
7475
LATCH
12
START
CLOCK f = 1.4MHz
1011 TA01
Response Time vs Overdrive
500
450
400
350
300
250
200
150
100
50
0
0.1
FALLING
OUTPUT
RISING
OUTPUT
1
10
OVERDRIVE (mV)
100
1011 TA02
1