1
LT1011/LT1011A
Voltage Comparator
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
15
V/
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
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
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
10
s 12-Bit A/D Converter
FEATURES
APPLICATIO S
U
TYPICAL APPLICATIO
U
DESCRIPTIO
U
6012
12-BIT
D/A CONVERTER
12
PARALLEL
OUTPUTS
PARALLEL
OUTPUTS
*R2 AND R4
SHOULD TC TRACK
R6
820
R3
6.98k
R2*
6.49k
R1
1k
FULL-SCALE
TRIM
LM329
7V
R4*
2.49k
R5
1k
11 10 9
8
7
6
5
4
3
2
2
3
0.001
F
7
1
20
14
15
16
17
19
18
15V
3.9k
15V
15V
13
24
5V
4
5
6
7
8
9
16 17 18 19 20 21
SERIAL OUTPUT
INPUT
0V TO 10V
5V
7475
LATCH
AM2504
SAR REGISTER
START
CLOCK f = 1.4MHz
1011 TA01
12
S
CP
D
CC
S
E
+
LT1011A
OVERDRIVE (mV)
0.1
200
RESPONSE TIME (ns)
250
300
350
400
1
10
100
1011 TA02
150
100
50
0
450
500
FALLING
OUTPUT
RISING
OUTPUT
Response Time vs Overdrive
2
LT1011/LT1011A
Supply Voltage (Pin 8 to Pin 4) .............................. 36V
Output to Negative Supply (Pin 7 to Pin 4)
LT1011AC, LT1011C .......................................... 40V
LT1011AI, LT1011I ............................................ 40V
LT1011AM, LT1011M (OBSOLETE) .............. 50V
Ground to Negative Supply (Pin 1 to Pin 4) ............ 30V
Differential Input Voltage ......................................
36V
Voltage at STROBE Pin (Pin 6 to Pin 8) .................... 5V
(Note 1)
ABSOLUTE
M
AXI
M
U
M
RATINGS
W
W
W
U
ORDER PART
NUMBER
ORDER PART NUMBER
LT1011ACH
LT1011CH
LT1011AMH
LT1011MH
LT1011ACN8
LT1011CN8
LT1011CS8
LT1011AIS8
LT1011IS8
T
JMAX
= 150
C,
JA
= 150
C/ W,
JC
= 45
C/ W
T
JMAX
= 150
C,
JA
= 130
C/ W(N8)
T
JMAX
= 150
C,
JA
= 150
C/ W(S8)
PACKAGE/ORDER I
N
FOR
M
ATIO
N
W
U
U
Input Voltage (Note 2) ....................... Equal to Supplies
Output Short-Circuit Duration .............................. 10 sec
Operating Temperature Range (Note 3)
LT1011AC, LT1011C ............................... 0
C to 70
C
LT1011AI, LT1011I ........................... 40
C to 85
C
LT1011AM, LT1011M (OBSOLETE) 55
C to 125
C
Storage Temperature Range ................. 65
C to 150
C
Lead Temperature (Soldering, 10 sec).................. 300
C
S8 PART MARKING
1011
1011AI
1011I
TOP VIEW
OUTPUT
V
+
GND
INPUT
BALANCE/
STROBE
BALANCE
INPUT
V
8
7
6
5
3
2
1
4
H PACKAGE
8-LEAD TO-5 METAL CAN
+
1
2
3
4
8
7
6
5
TOP VIEW
GND
INPUT
INPUT
V
V+
OUTPUT
BALANCE
S8 PACKAGE
8-LEAD PLASTIC SO
N8 PACKAGE
8-LEAD PDIP
BALANCE/
STROBE
+
ELECTRICAL CHARACTERISTICS
The
q
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25
C.
V
S
=
15V, V
CM
= 0V, R
S
= 0
, V
1
= 15V, output at pin 7 unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
(Note 4)
0.3
0.5
0.6
1.5
mV
q
1.0
3.0
mV
*Input Offset Voltage
R
S
50k (Note 5)
0.75
2.0
mV
q
1.50
3.0
mV
I
OS
*Input Offset Current
(Note 5)
0.2
3
0.2
4
nA
q
5
6
nA
I
B
Input Bias Current
(Note 4)
15
25
20
50
nA
*Input Bias Current
(Note 5)
20
35
25
65
nA
q
50
80
nA
LT1011AC/AI/AM
LT1011C/I/M
*
Indicates parameters which are guaranteed for all supply voltages, including a single 5V supply. See Note 5.
J8 PACKAGE 8-LEAD CERDIP
T
JMAX
= 150
C,
JA
= 100
C/ W(J8)
OBSOLETE PACKAGES
Consider the N8 or S8 Packages for Alternate Source
LT1011ACJ8
LT1011CJ8
LT1011AMJ8
LT1011MJ8
ORDER PART NUMBER
Consult LTC Marketing for parts specified with wider operating temperature ranges.
3
LT1011/LT1011A
ELECTRICAL CHARACTERISTICS
The
q
denotes the specifications which apply over the full operating temperature range, otherwide specifications are at T
A
= 25
C.
V
S
=
15V, V
CM
= 0V, R
S
= 0
, V
1
= 15V, output at pin 7 unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage Drift
T
MIN
T
T
MAX
q
4
15
4
25
V/
C
T
(Note 6)
A
VOL
*Large-Signal Voltage Gain
R
L
= 1k to 15V,
200
500
200
500
V/mV
10V
V
OUT
14.5V
R
L
= 500
to 5V,
50
300
50
300
V/mV
0.5V
V
OUT
4.5V
CMRR
Common Mode
94
115
90
115
dB
Rejection Ratio
*Input Voltage Range
V
S
=
15V
q
14.5
13
14.5
13
V
(Note 9)
V
S
= Single 5V
q
0.5
3
0.5
3
V
t
D
*Response Time
(Note 7)
150
250
150
250
ns
V
OL
*Output Saturation Voltage,
V
IN
= 5mV, I
SINK
= 8mA, T
J
100
C
0.25
0.40
0.25
0.40
V
V
1
= 0
V
IN
= 5mV, I
SINK
= 8mA
q
0.25
0.45
0.25
0.45
V
V
IN
= 5mV, I
SINK
= 50mA
q
0.70
1.50
0.70
1.50
V
*Output Leakage Current
V
IN
= 5mV, V
1
= 15V,
0.2
10
0.2
10
nA
V
OUT
= 35V (25V for LT1011C/I)
q
500
500
nA
*Positive Supply Current
3.2
4.0
3.2
4.0
mA
*Negative Supply Current
1.7
2.5
1.7
2.5
mA
*Strobe Current
Minimum to Ensure Output
500
500
A
(Note 8)
Transistor is Off
Input Capacitance
6
6
pF
LT1011AC/AI/AM
LT1011C/I/M
Note 1: Absolute Maximum Ratings are those values beyond which the
life of a device may be impaired.
Note 2: Inputs may be clamped to supplies with diodes so that
maximum input voltage actually exceeds supply voltage by one diode
drop. See Input Protection in the Applications Information section.
Note 3: T
JMAX
= 150
C.
Note 4: Output is sinking 1.5mA with V
OUT
= 0V.
Note 5: These specifications apply for all supply voltages from a single
5V to
15V, the entire input voltage range, and for both high and low
output states. The high state is I
SINK
100
A, V
OUT
(V
+
1V) and
the low state is I
SINK
8mA, V
OUT
0.8V. Therefore, this specification
defines a worst-case error band that includes effects due to common
mode signals, voltage gain and output load.
Note 6: Drift is calculated by dividing the offset voltage difference
measured at min and max temperatures by the temperature difference.
Note 7: Response time is measured with a 100mV step and 5mV
overdrive. The output load is a 500
resistor tied to 5V. Time
measurement is taken when the output crosses 1.4V.
Note 8: Do not short the STROBE pin to ground. It should be current
driven at 3mA to 5mA for the shortest strobe time. Currents as low as
500
A will strobe the LT1011A if speed is not important. External
leakage on the STROBE pin in excess of 0.2
A when the strobe is "off"
can cause offset voltage shifts.
Note 9: See graph "Input Offset Voltage vs Common Mode Voltage."
*
Indicates parameters which are guaranteed for all supply voltages, including a single 5V supply. See Note 5.
4
LT1011/LT1011A
TYPICAL PERFOR A CE CHARACTERISTICS
U
W
Input Bias Current
Input Offset Current
Worst-Case Offset Error
TEMPERATURE (
C)
50
CURRENT (nA)
25
30
35
50
75
100 125 150
1011 G01
20
15
0
25
0
25
5
10
45
40
I
B
FLOWS OUT
OF INPUTS
TEMPERATURE (
C)
50
CURRENT (nA)
0.5
0.6
0.7
50
75
100 125 150
1011 G01
0.4
0.3
0
25
0
25
0.1
0.2
0.9
0.8
SOURCE RESISTANCE (
)
1k
0.1
EQUIVALENT OFFSET VOLTAGE (mV)
1
10
100
10k
100k
1M
1011 G03
LM311
(FOR COMPARISON)
LT1011M
LT1011C
LT1011AM
LT1011AC
Input Characteristics*
Common Mode Limits
Transfer Function (Gain)
INPUT VOLTAGE (V)
20
INPUT CURRENT (nA)
15
10
5
0
5
10
15
20
1011 G04
20
25
40
15 10
5
35
30
5
0
*EITHER INPUT.
REMAINING INPUT GROUNDED.
CURRENT FLOWS OUT OF INPUT.
V
S
=
15V
TEMPERATURE (
C)
50
COMMON MODE VOLTAGE (V)
2.0
1.5
1.0
50
75
100 125 150
1011 G05
0.4
0.3
V
25
0
25
0.1
0.2
V
+
0.5
REFERRED TO SUPPLIES
POSITIVE LIMIT
NEGATIVE LIMIT
DIFFERENTIAL INPUT VOLTAGE (mV)
0.5
30
40
50
0.3
1011 G06
20
OUTPUT VOLTAGE (V)
10
0
0.3
0.1
0.1
0.5
T
A
= 25
C
COLLECTOR
OUTPUT
R
L
= 1k
EMITTER
OUTPUT
R
L
= 600
Response Time--Collector Output
Response Time--Collector Output
Collector Output Saturation
Voltage
TIME (ns)
0
2
4
6
350
1011 G07
0
100mV
1
3
5
0
50 100 150
250 300
400
200
450
V
S
=
15V
5mV
2mV
OVERDRIVE
20mV
INPUT = 100mV STEP
15V
5V
500
V
IN
15V
+
TIME (ns)
0
2
4
6
350
1011 G08
0
100mV
1
3
5
0
50 100 150
250 300
400
200
450
V
S
=
15V
5mV
2mV
OVERDRIVE
20mV
INPUT = 100mV STEP
15V
5V
500
V
IN
15V
+
SINK CURRENT (mA)
SATURATION VOLTAGE (V)
5
0
0.6
0.8
1.0
40
1011 G09
0.4
0.3
0.2
0.5
0.7
0.9
0.1
0
10
15 20
30 35
45
25
50
PIN 1 GROUNDED
T
A
= 125
C
T
A
= 55
C
T
A
= 25
C
5
LT1011/LT1011A
TYPICAL PERFOR A CE CHARACTERISTICS
U
W
Response Time Using GND Pin
as Output
OUTPUT VOLTAGE (V)
0
0
20
40
60
80
100
120
140
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
1011 G12
5
10
15
SHORT-CIRCUIT CURRENT (mA)
POWER DISSIPATION (W)
SHORT-CIRCUIT
CURRENT
*MEASURED 3 MINUTES
AFTER SHORT
POWER
DISSIPATION
T
A
= 25
C
TIME (
s)
0
INPUT VOLTAGE (mV)
OUTPUT VOLTAGE (V)
0
10
15
2
4
1011 G10
100
0
10
50
5
5
15
1
3
20mV
5mV
2mV
V
S
=
15V
T
A
= 25
C
2k
V
OUT
V
IN
V
V
+
TIME (
s)
0
INPUT VOLTAGE (mV)
OUTPUT VOLTAGE (V)
0
10
15
2
4
1011 G11
100
0
10
50
5
5
15
1
3
20mV
V
S
=
15V
T
A
= 25
C
2k
V
OUT
V
IN
V
V
+
5mV
2mV
Response Time Using GND Pin
as Output
Output Limiting Characteristics*
Supply Current vs Supply Voltage
Supply Current vs Temperature
SUPPLY VOLTAGE (V)
0
0
CURRENT (mA)
1
2
3
4
5
5
10
15
20
1011 G13
25
30
POSITIVE SUPPLY
COLLECTOR OUTPUT "LO"
POSITIVE AND NEGATIVE SUPPLY
COLLECTOR OUTPUT "HI"
TEMPERATURE (C)
50
CURRENT (mA)
4
5
6
25
75
1011 G14
3
2
25
0
50
100
125
1
0
POSITIVE SUPPLY
COLLECTOR OUTPUT "LO"
POSITIVE AND NEGATIVE SUPPLY
COLLECTOR OUTPUT "HI"
TEMPERATURE (
C)
10
10
LEAKAGE CURRENT (A)
10
9
10
8
10
7
25
65
85
105
10
11
45
125
1011 G15
V
S
=
15V
V
OUT
= 35V
V
GND
= 15V
Output Leakage Current
Output Saturation--
Ground Output
OUTPUT CURRENT (mA)
0
V
+
TO GROUND PIN VOLTAGE (V)
3
4
5
40
1011 G16
2
1
0
10
20
30
50
T
J
= 125
C
T
J
= 25
C
T
J
= 55
C
REFERRED TO V
+
2
3
4
1
7
8
V
+
V
R
L
V
OUT
LT1011
+
INPUT OVERDRIVE (mV)
0
0
SATURATION VOLTAGE (V)
0.1
0.2
0.3
0.4
2
4
6
8
1011 G17
0.5
0.6
1
3
5
7
I
SINK
= 8mA
T
J
= 125
C
T
J
= 25
C
T
J
= 55
C
INPUT STEP (V)
0
PROPAGATION DELAY (ns)
600
800
1000
8
1011 G18
400
200
0
2
4
6
1
9
3
5
7
10
V
S
=
15V
R
L
= 500
TO 5V
OVERDRIVE = 5mV
+
3
INPUT
500
2
1
7
5V
RISING INPUT
FALLING INPUT
Output Saturation Voltage
Response Time vs Input Step Size