Datasheet

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LT1011/LT1011A

1011afe

For more information www.linear.com/LT1011

OVERDRIVE (mV)

0.1

200

RESPONSE TIME (ns)

250

300

350

400

1 10 100

1011 TA02

150

100

450

500

FALLING

OUTPUT

RISING

OUTPUT

10µs 12-Bit A/D Converter

Response Time vs Overdrive

Typical applicaTion

DescripTion

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

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 ±18V 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

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.

FeaTures

applicaTions

Pin Compatible with LM111 Series Devices

Guaranteed Max 0.5mV Input Offset Voltage

Guaranteed Max 25nA Input Bias Current

Guaranteed Max 3nA Input Offset Current

Guaranteed Max 250ns Response Time

Guaranteed Min 200,000 Voltage Gain

50mA Output Current Source or Sink

±30V Differential Input Voltage

Fully Specified for Single 5V Operation

Available in 8-Lead PDIP and SO Packages

SAR A/D Converters

Voltage-to-Frequency Converters

Precision RC Oscillator

Peak Detector

Motor Speed Control

Pulse Generator

Relay/Lamp Driver

6012

12-BIT

D/A CONVERTER

PARALLEL

OUTPUTS

PARALLEL

OUTPUTS

*R2 AND R4

SHOULD TC TRACK

820Ω

6.98k

R2*

6.49k

FULL-SCALE

TRIM

LM329

R4*

2.49k

0.001µF

–15V

3.9k

15V

SERIAL OUTPUT

INPUT

0V TO 10V 5V

7475

LATCH

AM2504

SAR REGISTER

START CLOCK f = 1.4MHz

1011 TA01

S CP

–

LT1011A

L, LT , LTC , LT M, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

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Summary of content (20 pages)

PAGE 1
LT1011/LT1011A Voltage Comparator Features n n n n n n n n n n Description Pin Compatible with LM111 Series Devices Guaranteed Max 0.
PAGE 2
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 (OBSOLETE)........................50V Ground to Negative Supply (Pin 1 to Pin 4)...............30V Differential Input Voltage.........................................
PAGE 3
LT1011/LT1011A Order Information LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT1011ACN8#PBF N/A LT1011 8-Lead Plastic DIP 0°C to 70°C LT1011CN8#PBF N/A LT1011 8-Lead Plastic DIP 0°C to 70°C LT1011AIS8#PBF LT1011AIS8#TRPBF 1011AI 8-Lead Plastic SO –40°C to 85°C LT1011CS8#PBF LT1011CS8#TRPBF 1011 8-Lead Plastic SO 0°C to 70°C LT1011IS8#PBF LT1011IS8#TRPBF 1011I 8-Lead Plastic SO –40°C to 85°C OBSOLETE PACKAGES LT1011ACH#PBF N/A 8-Lead TO-5
PAGE 4
LT1011/LT1011A Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = ±15V, VCM = 0V, RS = 0Ω, VGND = –15V, output at pin 7 unless otherwise noted. LT1011AC/AI/AM SYMBOL PARAMETER VOS Input Offset Voltage *Input Offset Voltage CONDITIONS MIN TYP MAX 0.3 ● 0.5 1 ● 0.75 1.
PAGE 5
LT1011/LT1011A Typical Performance Characteristics Input Offset Current 0.8 35 0.7 30 0.6 25 20 15 0.5 0.4 0.3 10 0.2 5 0.1 0 0 –50 –25 25 50 75 100 125 150 TEMPERATURE (°C) 0 Input Characteristics* –15 –20 –25 –30 –35 TA = 25°C –1.5 –2.0 REFERRED TO SUPPLIES 0.4 0.3 NEGATIVE LIMIT 0.2 COLLECTOR OUTPUT RL = 1k 40 30 20 10 EMITTER OUTPUT RL = 600Ω 0.
PAGE 6
LT1011/LT1011A Typical Performance Characteristics 5mV 2mV 5 – VIN 0 V+ + –5 VOUT –10 2k –15 V– 0 –50 VS = ±15V TA = 25°C –100 0 1 4 3 2 TIME (µs) V+ 15 VIN 10 5 – + 0 VOUT 2k –5 –10 5mV 20mV –15 V– 2mV –100 VS = ±15V TA = 25°C –50 0 0 1 2 TIME (µs) Supply Current vs Supply Voltage 60 0.
PAGE 7
LT1011/LT1011A Typical Performance Characteristics 2.5 INPUT OFFSET VOLTAGE (mV) 2.0 CHANGE IN VOS (mV/µA) Input Offset Voltage vs Common Mode Voltage TJ = 25°C 1.5 UPPER COMMON MODE + – (1.5V) LIMIT = V 1.0 0.5 0 Offset Pin Characteristics 0.8 0.6 0.4 0.2 0 –0.5 –150mV –1.0 –1.5 –2.0 –2.5 V– (OR GND WITH SINGLE SUPPLY) V– 0.1 0.2 0.3 0.4 0.5 0.6 0.
PAGE 8
LT1011/LT1011A Applications Information Preventing Oscillation Problems Oscillation problems in comparators are nearly always caused by stray capacitance between the output and inputs or between the output and other sensitive pins on the comparator. This is especially true with high gain bandwidth comparators like the LT1011, which are designed for fast switching with millivolt input signals. The gain bandwidth product of the LT1011 is over 10GHz.
PAGE 9
LT1011/LT1011A Applications Information Note that at low frequencies, the error is simply the DC hysteresis, while at high frequencies, an additional error is created by the AC hysteresis. The high frequency error can be reduced by reducing CH, but lower values may not provide clean switching with very low slew rate input signals.
PAGE 10
LT1011/LT1011A Applications Information The input resistors should limit fault current to a reasonable value (0.1mA to 20mA). Power dissipation in the resistors must be considered for continuous faults, especially 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. 15V 3 The response time of a comparator is typically measured with a 100mV step and a 5mV to 10mV overdrive.
PAGE 11
LT1011/LT1011A Applications Information is tied to V+, the voltage at the emitter in the “on” state is about 2V below V+ (see curves). In the “off” state, I1 is switched off and both Q1 and Q2 turn off. The collector of Q2 can be now held at any voltage above V – without conducting current, including voltages above the positive supply level. Maximum voltage above V– is 50V for the LT1011M and 40V for the LT1011C/I.
PAGE 12
LT1011/LT1011A Typical Applications Strobing 2 3 Driving Ground Referred Load V++** V+ + 7 LT1011 – 2 6 INPUTS* TTL STROBE 3 V+ LT1011 + V– 7 3 1 L1 NOTE: DO NOT GROUND STROBE PIN 2 1011 TA07 2 D2 D1 3 VOLTAGE INPUT + 7 LT1011 LT1011 – OUTPUT HIGH INSIDE “WINDOW” AND LOW ABOVE HIGH LIMIT OR BELOW LOW LIMIT 1 + 7 LT1011 – 1 Crystal Oscillator 5V 10k OUTPUT 2 85kHz 100pF 1k 8 + 50k 7 LT1011 3 GROUND OR LOW IMPEDANCE REFERENCE *SEE CURVE, “RESPONSE TIME vs INPUT
PAGE 13
LT1011/LT1011A Typical Applications Combining Offset Adjust and Strobe Combining Offset Adjustment and Hystersis V+ 10k 3 2 + RH* 2RH** 20k 5 – V+ 5k 6 LT1011 3 TTL OR CMOS 5V 2 1k – 5 + *HYSTERESIS IS ≈0.45mV/µA OF CURRENT CHANGE IN RH RL **THIS RESISTOR CAUSES HYSTERESIS TO BE CENTERED AROUND VOS 20k 6 LT1011 7 1011 TA15 1 1011 TA13 Direct Strobe Drive When CMOS* Logic Uses Same V + Supply as LT1011 Low Drift R/C Oscillator † V+ 3 2 + ** 8 – 2 6 LT1011 15V C1 0.
PAGE 14
LT1011/LT1011A Typical Applications 4-Digit (10,000 Count) A/D Converter 15V ZERO TRIM R1 1k 1 3 R2 18k R3 3.9k 8 4 C4 0.01µF –15V R4 5.6k 8 D1 D2 C1* 0.1µF C2** 15pF R8 3k 15V D3 D4 R7 22Ω 5V C5 0.01µF + 6 LT1011 3 6 7 15V R5 4.7k 2 2 5 LF398 5V INPUT 0V TO 10V R6 4.7K 7 1 – OUTPUT = 1 COUNT PER mV, f = 1MHz CLOCK 1MHz 4 –15V 15V C3 0.1µF R11 6.8K R10 1k R9 FULL-SCALE 3.65k TRIM 2N3904 LM329 R12 6.
PAGE 15
LT1011/LT1011A Typical Applications Fast Settling Filter 100pF 1M 15V 2 1M 4.7k VIN 3 –15V 15V 100k 2 –15V 8 3 1 100pF 1.5k 7 1 LT1011 OUTPUT 8 1µF OFM-1A 4 – 6 LT1008C 4 4.7k 0.1µF 7 5 + 6 INPUT* 15V 15V 3 2 COMPARATORS DRIVE OPTO-COUPLED FET “ON” WHEN DIFFERENCE BETWEEN OUTPUT AND INPUT EXCEEDS THRESHOLD. WHEN OUTPUT APPROACHES INPUT, THE GATE TURNS “OFF” AND LOW PASS FILTERING OCCURS.
PAGE 16
LT1011/LT1011A Schematic Diagram OFFSET OFFSET/STROBE V+ 5 6 8 R8 800Ω Q6 R27 3k R4 300Ω R5 160Ω 2 R2 1.3k Q10 R3 300Ω R23 4k Q11 Q5 Q31 INPUT (+) R1 1.3k R9 800Ω D1 D2 Q30 Q29 Q12 R6 3.2k R7 3.2k D4 D6 Q13 Q7 Q8 Q14 Q3 INPUT (–) Q9 Q19 3 Q27 D5 D7 Q26 Q23 R26 1.6k R19 500Ω 7 R12 470Ω R17 200Ω Q21 R20 940Ω Q22 R25 1.
PAGE 17
LT1011/LT1011A Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. H Package 8-Lead TO-5 Metal Can (.230 Inch PCD) (Reference LTC DWG # 05-08-1321) 0.040 (1.016) MAX OBSOLETE PACKAGE 0.335 – 0.370 (8.509 – 9.398) DIA 0.305 – 0.335 (7.747 – 8.509) 0.027 – 0.045 (0.686 – 1.143) 45°TYP 0.050 (1.270) MAX SEATING PLANE 0.165 – 0.185 (4.191 – 4.699) GAUGE PLANE 0.010 – 0.045* (0.254 – 1.143) PIN 1 0.028 – 0.034 (0.711 – 0.864) 0.
PAGE 18
LT1011/LT1011A Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. N8 Package 8-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) .300 – .325 (7.620 – 8.255) .045 – .065 (1.143 – 1.651) .065 (1.651) TYP .008 – .015 (0.203 – 0.381) ( +.035 .325 –.015 +0.889 8.255 –0.381 ) .400* (10.160) MAX .130 ± .005 (3.302 ± 0.127) 8 7 6 5 1 2 3 4 .255 ± .015* (6.477 ± 0.381) .120 (3.048) .020 MIN (0.508) MIN .018 ± .003 (0.
PAGE 19
LT1011/LT1011A Revision History (Revision history begins at Rev D) REV DATE DESCRIPTION D 10/12 Update to Product Description 1 Addition of Order Information 2, 3 E 4/13 PAGE NUMBER Addition of Pin Function Information 7 Correction to Positive Peak Detector Circuit 13 Correction to Pin Function descriptions 2, 7 Correction to Order Information and Obsolete Packages 3 Correction to Graphs: Response Time—Collector Output – high to low Response Time Using GND Pin as Output – low to high R
PAGE 20
LT1011/LT1011A Typical Application 10Hz to 100kHz Voltage to Frequency Converter R7 4.7k R4 1M 15V C1 0.002µF POLYSTYRENE R1 4.7k INPUT 0V TO 10V LT1009 2.5V 15V R2 5k FULL-SCALE R3 TRIM 8.06k R5 2k 15V 3 C2 0.68µF 15V R16 50k 10Hz TRIM 15V R17† 22M 2 R6 2k LINEARITY ≈0.01% 8 – LT1011 + R8 4.7k 7 1 –15V 4 1.5µs 6 4.4V –15V 0.