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Linear Technology Electronic Components Datasheet

LT1011 Datasheet

Voltage Comparator

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LT1011 pdf
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 Vand 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
LM329
7V
3.9k
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*
2.49k
R6
820
2+
LT1011A
3
R5
1k
7
24
5V
4 5 6 7 8 9 16 17 18 19 20 21
AM2504
SAR REGISTER
ES
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



Linear Technology Electronic Components Datasheet

LT1011 Datasheet

Voltage Comparator

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LT1011 pdf
LT1011/LT1011A
ABSOLUTE MAXIMUM RATINGS (Note 1)
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 ........................................ 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
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 ..................... – 55°C to 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
V+
8
GND 1
7 OUTPUT
INPUT 2
+
6
BALANCE/
STROBE
INPUT 3
5 BALANCE
4
V
H PACKAGE
8-LEAD TO-5 METAL CAN
TJMAX = 150°C, θJA = 150°C/ W, θJC = 45°C/ W
ORDER PART
NUMBER
LT1011ACH
LT1011CH
LT1011AMH
LT1011MH
TOP VIEW
GND 1
INPUT 2
INPUT 3
V4
+
8 V+
7 OUTPUT
6
BALANCE/
STROBE
5 BALANCE
J8 PACKAGE
8-LEAD CERDIP
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 100°C/ W(J8)
TJMAX = 150°C, θJA = 130°C/ W(N8)
TJMAX = 150°C, θJA = 150°C/ W(S8)
ORDER PART
NUMBER
LT1011ACJ8
LT1011CJ8
LT1011ACN8
LT1011CN8
LT1011CS8
LT1011AIS8
LT1011IS8
LT1011AMJ8
LT1011MJ8
S8 PART MARKING
1011
1011AI
1011I
ELECTRICAL CHARACTERISTICS
The q denotes the specifications which apply over the full operating temperature range, otherwide specifications are at TA = 25°C.
VS = ±15V, VCM = 0V, RS = 0, V1 = –15V, output at pin 7 unless otherwise noted.
SYMBOL PARAMETER
VOS Input Offset Voltage
*Input Offset Voltage
IOS *Input Offset Current
IB Input Bias Current
*Input Bias Current
CONDITIONS
(Note 4)
RS 50k (Note 5)
(Note 5)
(Note 4)
(Note 5)
LT1011AC/AI/AM
MIN TYP MAX
0.3 0.5
q 1.0
0.75
q 1.50
0.2 3
q5
15 25
20 35
q 50
LT1011C/ I/M
MIN TYP MAX
0.6 1.5
3.0
2.0
3.0
0.2 4
6
20 50
25 65
80
UNITS
mV
mV
mV
mV
nA
nA
nA
nA
nA
*Indicates parameters which are guaranteed for all supply voltages, including a single 5V supply. See Note 5.
2



Linear Technology Electronic Components Datasheet

LT1011 Datasheet

Voltage Comparator

No Preview Available !

LT1011 pdf
LT1011/LT1011A
ELECTRICAL CHARACTERISTICS
The q denotes the specifications which apply over the full operating temperature range, otherwide specifications are at TA = 25°C.
VS = ±15V, VCM = 0V, RS = 0, V1 = –15V, output at pin 7 unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
LT1011AC/AI/AM
MIN TYP MAX
VOS
T
Input Offset Voltage Drift
(Note 6)
TMIN T TMAX
q 4 15
AVOL
CMRR
*Large-Signal Voltage Gain
Common Mode
Rejection Ratio
RL = 1k to 15V,
–10V VOUT 14.5V
RL = 500to 5V,
0.5V VOUT 4.5V
200 500
50 300
94 115
*Input Voltage Range
(Note 9)
VS = ±15V
VS = Single 5V
q –14.5
q 0.5
13
3
tD *Response Time
(Note 7)
150 250
VOL *Output Saturation Voltage, VIN = 5mV, ISINK = 8mA, TJ 100°C
V1 = 0
VIN = 5mV, ISINK = 8mA
q
VIN = 5mV, ISINK = 50mA
q
0.25 0.40
0.25 0.45
0.70 1.50
*Output Leakage Current
VIN = 5mV, V1 = –15V,
VOUT = 35V (25V for LT1011C/I)
q
0.2 10
500
*Positive Supply Current
3.2 4.0
*Negative Supply Current
1.7 2.5
*Strobe Current
(Note 8)
Minimum to Ensure Output
Transistor is Off
500
Input Capacitance
6
LT1011C/I/M
MIN TYP MAX
4 25
UNITS
µV/°C
200 500
V/mV
50 300
V/mV
90 115
dB
– 14.5
0.5
150
0.25
0.25
0.70
0.2
3.2
1.7
500
13
3
250
0.40
0.45
1.50
10
500
4.0
2.5
V
V
ns
V
V
V
nA
nA
mA
mA
µA
6 pF
*Indicates parameters which are guaranteed for all supply voltages, including a single 5V supply. See Note 5.
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: TJMAX = 150°C.
Note 4: Output is sinking 1.5mA with VOUT = 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 ISINK 100µA, VOUT (V+ – 1V) and
the low state is ISINK 8mA, VOUT 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 500resistor 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
500µA will strobe the LT1011A if speed is not important. External
leakage on the STROBE pin in excess of 0.2µA when the strobe is “off”
can cause offset voltage shifts.
Note 9: See graph “Input Offset Voltage vs Common Mode Voltage.”
3




Part Number LT1011
Description Voltage Comparator
Maker Linear Technology
Total Page 16 Pages
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