LT1011A LINER [Linear Technology], LT1011A Datasheet

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LT1011A

Manufacturer Part Number
LT1011A
Description
Voltage Comparator
Manufacturer
LINER [Linear Technology]
Datasheet

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FEATURES
TYPICAL APPLICATIO
APPLICATIO S
, LTC and LT are registered trademarks of Linear Technology Corporation.
Pin Compatible with LM111 Series Devices
Guaranteed
Guaranteed
Guaranteed
Guaranteed
Guaranteed
50mA Output Current Source or Sink
Fully Specified for Single 5V Operation
SAR A/D Converters
Voltage-to-Frequency Converters
Precision RC Oscillator
Peak Detector
Motor Speed Control
Pulse Generator
Relay/Lamp Driver
PARALLEL
30V Differential Input Voltage
OUTPUTS
15V
5V
13
FULL-SCALE
24
20
12
4
12
TRIM
6.49k
R2*
Max 0.5mV Input Offset Voltage
Max 25nA Input Bias Current
Max 3nA Input Offset Current
Max 250ns Response Time
Min 200,000 Voltage Gain
R1
1k
11 10 9
5
E
14
6
U
7
6.98k
SAR REGISTER
R3
D/A CONVERTER
8
8
AM2504
START
12-BIT
15
7
9
S
6012
LM329
7V
6
16 17 18 19 20 21
0.001 F
10 s 12-Bit A/D Converter
5
CLOCK f = 1.4MHz
4
3.9k
U
16
3
CP
2
CC
D
S
17
1
19
PARALLEL
OUTPUTS
18
15V
–15V
SERIAL OUTPUT
2.49k
820
*R2 AND R4
R4*
SHOULD TC TRACK
0V TO 10V
R6
INPUT
LATCH
7475
2
3
+
LT1011A
DESCRIPTIO
The LT
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
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
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.
18V supply operation, and a floating transistor output
1011 TA01
R5
1k
7
5V
®
1011 is a general purpose comparator with sig-
Voltage Comparator
U
450
400
350
300
200
100
500
250
150
50
0
0.1
Response Time vs Overdrive
LT1011/LT1011A
OUTPUT
RISING
FALLING
OUTPUT
OVERDRIVE (mV)
1
and the collector output.
10
1011 TA02
100
1

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LT1011A Summary of contents

Page 1

... R6 LT1011A 2 1 820 3 – PARALLEL OUTPUTS SERIAL OUTPUT 7475 D LATCH 1011 TA01 LT1011/LT1011A Voltage Comparator U – and the collector output. Response Time vs Overdrive 500 450 400 350 300 FALLING 250 OUTPUT 200 RISING 150 OUTPUT 100 50 0 0.1 1 ...

Page 2

... Input Voltage (Note 2) ....................... Equal to Supplies Output Short-Circuit Duration .............................. 10 sec Operating Temperature Range (Note 3) LT1011AC, LT1011C ............................... LT1011AI, LT1011I ........................... – LT1011AM, LT1011M (OBSOLETE) – 125 C Storage Temperature Range ................. – 150 C Lead Temperature (Soldering, 10 sec).................. 300 TOP VIEW ...

Page 3

... 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. ...

Page 4

... INPUT = 100mV STEP 0 50 100 150 250 300 400 0 200 350 450 TIME (ns) 1011 G08 Worst-Case Offset Error 100 LM311 (FOR COMPARISON) 10 LT1011M LT1011C LT1011AM 1 LT1011AC 0.1 1k 10k 100k 1M SOURCE RESISTANCE ( ) 1011 G03 Transfer Function (Gain COLLECTOR OUTPUT ...

Page 5

... I SINK 0 125 0 – 0 INPUT OVERDRIVE (mV) LT1011/LT1011A Output Limiting Characteristics* 140 120 POWER DISSIPATION 100 V OUT 80 60 SHORT-CIRCUIT CURRENT 40 20 *MEASURED 3 MINUTES AFTER SHORT OUTPUT VOLTAGE (V) 1011 G11 Output Leakage Current – ...

Page 6

... LT1011/LT1011A W U TYPICAL PERFOR A CE CHARACTERISTICS Input Offset Voltage vs Common Mode Voltage 2 2.0 1.5 1.0 0.5 LIMIT = V 0 – 0.5 –1.0 – V (OR GND WITH –1.5 SINGLE SUPPLY) – 2.0 – 2.5 – V 0.1 0.2 0.3 0.4 0.5 0.6 0.7 COMMON MODE VOLTAGE ( APPLICATIONS INFORMATION Preventing Oscillation Problems Oscillation problems in comparators are nearly always ...

Page 7

... If very large (fault) input voltages must be accom- modated, series resistors and clamp diodes should be used (see Figure 3). INPUTS D1 TO D4: 1N4148 * MAY BE ELIMINATED FOR I ** SELECT ACCORDING TO ALLOWABLE FAULT CURRENT AND POWER DISSIPATION LT1011/LT1011A 0.003 OUTPUT “LO” TO “HI” ...

Page 8

... LT1011/LT1011A U U APPLICATIONS INFORMATION The input resistors should limit fault current to a reason- able value (0.1mA to 20mA). Power dissipation in the resistors must be considered for continuous faults, espe- cially when the LT1011 supplies are off. One final caution: lightly loaded supplies may be forced to higher voltages by large fault currents flowing through D1-D4 ...

Page 9

... – R LOAD 7 LT1011 GROUND ++ + V CAN BE GREATER OR LESS THAN V 1011 TA05 LT1011/LT1011A + (see curves). Driving Load Referenced to Negative Supply + – INPUTS* LT1011 *INPUT POLARITY IS REVERSED WHEN USING PIN 1 AS OUTPUT V 7 LOAD 1011 TA06 ...

Page 10

... LT1011/LT1011A U TYPICAL APPLICATIONS Strobing LT1011 3 – 6 TTL STROBE 1k 1011 TA04 NOTE: DO NOT GROUND STROBE PIN Using Clamp Diodes to Improve Frequency Response* CURRENT MODE 2 INPUT (DAC, ETC VOLTAGE INPUT R1 *SEE CURVE, “RESPONSE TIME vs INPUT STEP SIZE” Noise Immune 60Hz Line Sync** ...

Page 11

... LT1011 + 2 1 100pF + C1 MYLAR –15V ** SELECT FOR REQUIRED RESET TIME CONSTANT LT1011/LT1011A Combining Offset Adjustment and Hystersis + HYSTERESIS IS 0.45mV CURRENT CHANGE IN R 20k 6 ** THIS RESISTOR CAUSES HYSTERESIS CENTERED AROUND ...

Page 12

... LT1011/LT1011A U TYPICAL APPLICATIONS 15V ZERO R1 TRIM 1k R2 0.01 F 18k LF398 3.9k –15V C1* C2** 0.1 F 15pF R4 5. 15V D4 LM329 START 12ms T [C (pF)][1 s/pF] H MAX T 10 • C • (1 s/pF) L MAX D1 TTL OR CMOS (OPERATING ON 5V) 100k R1 5k 86.6k + † C** † D3 † ...

Page 13

... TA21 100kHz Precision Rectifier 74C04 820 7 LT1011 3 – 1 – – 5V 74C04 – 5V LT1011/LT1011A 100pF 1M 15V OUTPUT LT1008C –15V 100pF 5V 12k HP5082-2800 4 RECTIFIED OUTPUT 1k 820 12k – 5V 1011 TA23 ...

Page 14

... LT1011/LT1011A W W SCHE ATIC DIAGRA OFFSET R27 R5 300 3k 160 Q5 Q31 Q30 INPUT D4 D6 (+) Q29 2 Q1 Q28 INPUT D5 D7 (–) Q27 3 Q26 Q25 R25 R26 1.6k 1.6k PACKAGE DESCRIPTION 0.335 – 0.370 (8.509 – 9.398) DIA 0.305 – 0.335 (7.747 – 8.509) 0.040 (1 ...

Page 15

... LTC DWG # 05-08-1610) 0.053 – 0.069 (1.346 – 1.752) 0.004 – 0.010 (0.101 – 0.254) 0 – 8 TYP 0.050 0.014 – 0.019 (1.270) (0.355 – 0.483) TYP BSC LT1011/LT1011A 0.405 (10.287) MAX 0.220 – 0.310 (5.588 – 7.874 0.200 (5 ...

Page 16

... LT1011/LT1011A U TYPICAL APPLICATION 15V R2 5k FULL-SCALE R3 TRIM 8.06k INPUT 0V TO 10V 15V † R17 22M R16 50k 10Hz TRIM – 15V ALL DIODES 1N4148 TRANSISTORS 2N3904 * USED ONLY TO GUARANTEE START-UP † MAY BE INCREASED FOR BETTER 10Hz TRIM RESOLUTION RELATED PARTS PART NUMBER ...

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