Linear Technology LT1011AMH, LT1011AIS8, LT1011ACN8, LT1011ACJ8, LT1011ACH Datasheet

FEATURES

■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

APPLICATIOUS

■SAR A/D Converters

■Voltage-to-Frequency Converters

■Precision RC Oscillator

■Peak Detector

■Motor Speed Control

■Pulse Generator

■Relay/Lamp Driver

,LTC and LT are registered trademarks of Linear Technology Corporation.

LT1011/LT1011A

Voltage Comparator

DESCRIPTIOU

The LT®1011 is a general purpose comparator with significantly 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 referenced 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 APPLICATIOU

																							10 s 12-Bit A/D Converter
										R1																	3.9k						15V
											1k								LM329
				FULL-SCALE															7V																									*R2 AND R4
									TRIM																								–15V											SHOULD TC TRACK
									R2*							R3				0.001µF
15V									6.49k						6.98k
				20								14					15										16				17													INPUT
																															19													0V TO 10V									5V
																	6012																											R4*								R5
																	12-BIT
																																												2.49k								1k
				13												D/A CONVERTER																18															2				+
																																												R6							LT1011A	7
				12						11		10			9	8	7			6			5		4		3			2	1													820Ω			3
																																																		–
PARALLEL																																PARALLEL
OUTPUTS																																OUTPUTS

	4	5	6	7	8	9	16	17	18	19	20	21	SERIAL OUTPUT
													7475
						AM2504						D
	24												LATCH
5V
					SAR REGISTER						CC
			E			S				CP		S
	12					START			CLOCK f = 1.4MHz
													1011 TA01

RESPONSE TIME (ns)

Response Time vs Overdrive

500

450

400

350

300
						FALLING
250
						OUTPUT
200
		RISING
150
		OUTPUT
100
50
0
		1									10	100
0.1

OVERDRIVE (mV)

1011 TA02

1

LT1011/LT1011A

ABSOLUTE WMAXIWMUWM RATINGSU			(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 ......................................		±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 (OBSOLETE)	– 55°C to 125°C
Storage Temperature Range .................		– 65°C to 150°C
Lead Temperature (Soldering, 10 sec)..................		300°C

PACKAGE/ORDER IUNFORWMATIOUN

TOP VIEW

V+

		8
GND	1	7	OUTPUT
INPUT 2		+	BALANCE/
			6 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			TOP VIEW			ORDER PART NUMBER
	NUMBER	GND	1		8	V+	LT1011ACN8
		INPUT	2		7	OUTPUT
	LT1011ACH			+			LT1011CN8
						BALANCE/
		INPUT	3	–	6	STROBE	LT1011CS8
	LT1011CH	V –
			4		5	BALANCE	LT1011AIS8
	LT1011AMH
		N8 PACKAGE			S8 PACKAGE		LT1011IS8
	LT1011MH
		8-LEAD PDIP			8-LEAD PLASTIC SO		S8 PART MARKING
		TJMAX = 150°C, θJA = 130°C/ W(N8)
		TJMAX		= 150°C, θJA = 150°C/ W(S8)			1011
							1011AI
							1011I
			J8 PACKAGE 8-LEAD CERDIP				ORDER PART NUMBER
		TJMAX = 150°C, θJA = 100°C/ W(J8)

OBSOLETE PACKAGES	LT1011ACJ8	LT1011AMJ8
	LT1011CJ8	LT1011MJ8

Consider the N8 or S8 Packages for Alternate Source

Consult LTC Marketing for parts specified with wider operating temperature ranges.

ELECTRICAL CHARACTERISTICS

The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = ±15V, VCM = 0V, RS = 0Ω, V1 = –15V, output at pin 7 unless otherwise noted.

				LT1011AC/AI/AM		LT1011C/I/M
SYMBOL	PARAMETER	CONDITIONS		MIN TYP	MAX	MIN TYP	MAX	UNITS
VOS	Input Offset Voltage	(Note 4)		0.3	0.5	0.6	1.5	mV
			●		1.0		3.0	mV
	*Input Offset Voltage	RS ≤ 50k (Note 5)			0.75		2.0	mV
			●		1.50		3.0	mV
IOS	*Input Offset Current	(Note 5)		0.2	3	0.2	4	nA
			●		5		6	nA
IB	Input Bias Current	(Note 4)		15	25	20	50	nA
	*Input Bias Current	(Note 5)		20	35	25	65	nA
			●		50		80	nA

*Indicates parameters which are guaranteed for all supply voltages, including a single 5V supply. See Note 5.

2

LT1011/LT1011A

ELECTRICAL CHARACTERISTICS

The ● denotes the specifications which apply over the full operating temperature range, otherwide specifications are at TA = 25°C. VS = ±15V, VCM = 0V, RS = 0Ω, V1 = –15V, output at pin 7 unless otherwise noted.

				LT1011AC/AI/AM			LT1011C/I/M
SYMBOL	PARAMETER	CONDITIONS		MIN	TYP	MAX	MIN	TYP	MAX	UNITS
VOS	Input Offset Voltage Drift	TMIN ≤ T ≤ TMAX	●		4	15		4	25	µV/°C
T	(Note 6)
AVOL	*Large-Signal Voltage Gain	RL = 1k to 15V,		200	500		200	500		V/mV
		–10V ≤ VOUT ≤ 14.5V
		RL = 500Ω to 5V,		50	300		50	300		V/mV
		0.5V ≤ VOUT ≤ 4.5V
CMRR	Common Mode			94	115		90	115		dB
	Rejection Ratio
	*Input Voltage Range	VS = ±15V	●	–14.5		13	–14.5		13	V
	(Note 9)	VS = Single 5V	●	0.5		3	0.5		3	V
tD	*Response Time	(Note 7)			150	250		150	250	ns
VOL	*Output Saturation Voltage,	VIN = 5mV, ISINK = 8mA, TJ ≤ 100°C			0.25	0.40		0.25	0.40	V
	V1 = 0	VIN = 5mV, ISINK = 8mA	●		0.25	0.45		0.25	0.45	V
		VIN = 5mV, ISINK = 50mA	●		0.70	1.50		0.70	1.50	V
	*Output Leakage Current	VIN = 5mV, V1 = –15V,			0.2	10		0.2	10	nA
		VOUT = 35V (25V for LT1011C/I)	●			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			µA
	(Note 8)	Transistor is Off
	Input Capacitance				6			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 500Ω 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 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

LT1011/LT1011A

TYPICAL PERFORWAUCE CHARACTERISTICS

Input Bias Current

45

IB FLOWS OUT 40 OF INPUTS

		35
	(nA)	30
		25
	CURRENT
		20
		15

10

5

0

– 50 – 25 0 25 50 75 100 125 150 TEMPERATURE (°C)

1011 G01

Input Characteristics*

5 *EITHER INPUT.

0REMAINING INPUT GROUNDED. CURRENT FLOWS OUT OF INPUT.

(nA)	– 5 VS = ± 15V
	–10
CURRENT
	–15
INPUT	– 20
	– 25
	– 30
	– 35
	– 40

– 20 –15 –10 – 5 0

5

10 15 20

INPUT VOLTAGE (V)

1011 G04

Response Time—Collector Output

6	VS = ±15V
5
4	OVERDRIVE
3	20mV
	5mV			15V	5V
2	2mV	VIN	–		500Ω
1
0			+
				–15V
100mV

INPUT = 100mV STEP 0

0

50

100 150 200 250 300 350 400 450

TIME (ns)

	Input Offset Current											Worst-Case Offset Error
	0.9										100
	0.8									(mV)
	0.7																LM311
(nA)										VOLTAGE
	0.6										10			(FOR COMPARISON)
CURRENT	0.5									OFFSETEQUIVALENT
																LT1011M
	0.4
																LT1011C
	0.3										1				LT1011AM
	0.2														LT1011AC
	0.1										0.1
	0

– 50 – 25 0 25 50 75 100 125 150	1k	10k	100k	1M
TEMPERATURE (°C)		SOURCE RESISTANCE (Ω )

1011 G03

1011 G01

Common Mode Limits

Transfer Function (Gain)

V +

50

TA = 25°C

– 0.5

(V)

COLLECTOR

–1.0

POSITIVE LIMIT

40

OUTPUT

VOLTAGEMODECOMMON

(V)VOLTAGEOUTPUT

RL = 1k

0.2

NEGATIVE

LIMIT

–1.5

30

– 2.0

REFERRED TO SUPPLIES

0.4

20

0.3

10

EMITTER

0.1

OUTPUT

RL = 600Ω

V –

0

0 25 50 75 100 125 150

– 0.3

– 0.1

0.1

0.3

0.5

– 50 – 25

– 0.5

TEMPERATURE (°C)

DIFFERENTIAL INPUT VOLTAGE (mV)

1011 G05

1011 G06

Collector Output Saturation

Response Time—Collector Output

Voltage

6	±15V				1.0
VS =			15V	5V	0.9	PIN 1 GROUNDED
5			–
4		VIN		500Ω	0.8
	OVERDRIVE			(V)							TA = 125°C
3					0.7
		20mV	+	VOLTAGE					TA = 25°C
2		5mV	–15V		0.6
		2mV
1					0.5
				SATURATION
0					0.4						TA = – 55°C
					0.3
100mV	INPUT = 100mV STEP				0.2
0					0.1
0	50	100 150 200 250 300 350 400 450			0	5	10	15	20	25	30	35	40	45	50
					0
		TIME (ns)						SINK CURRENT (mA)

1011 G07

1011 G08

1011 G09

4

LT1011/LT1011A

TYPICAL PERFORWAUCE CHARACTERISTICS

Response Time Using GND Pin	Response Time Using GND Pin	Output Limiting Characteristics*
as Output	as Output

	15	5mV	2mV				15
(V)	20mV					(V)
	10			V +			10
VOLTAGE						VOLTAGE
	5						5
	0		VIN				0
OUTPUT	– 5			VOUT		OUTPUT	– 5
	–10						–10
				2k
	–15						–15
(mV)				V –		(mV)
	0						0
VOLTAGE						VOLTAGE
	– 50						– 50
	–100			VS = ±15V			–100
				TA = 25°C
INPUT						INPUT
	0	1	2	3	4
			TIME (µs)
				1011 G10

			V +			140	TA = 25°C		0.7
		VIN			(mA)	120		POWER	0.6
					CURRENT	100		DISSIPATION	0.5
				VOUT
				2k		80			0.4
					CIRCUIT			CURRENT
			V –			60			0.3
		5mV						SHORT-CIRCUIT
	20mV		2mV
					-
			VS = ±15V		SHORT	40			0.2
			TA = 25°C			20	*MEASURED 3 MINUTES		0.1
						0		AFTER SHORT	0
0	1	2	3	4		0	5	10	15
		TIME (µs)					OUTPUT VOLTAGE (V)
				1011 G11				1011 G12

(W) DISSIPATION POWER

		Supply Current vs Supply Voltage																Supply Current vs Temperature
	5															6
	4															5
					POSITIVE SUPPLY											4
(mA)					COLLECTOR OUTPUT “LO”										(mA)										POSITIVE SUPPLY
	3																							COLLECTOR OUTPUT “LO”
CURRENT					COLLECTOR			OUTPUT		“HI”					CURRENT	3
	2		POSITIVE AND NEGATIVE SUPPLY													2
	1
																1
																			POSITIVE AND NEGATIVE SUPPLY
																				COLLECTOR OUTPUT “HI”
	0															0
	0		5		10		15		20		25		30			–50				–25		0		25		50		75		100		125
					SUPPLY VOLTAGE (V)																		TEMPERATURE (˚C)
													1011 G13																		1011 G14
		Output Saturation—
		Ground Output															Output Saturation Voltage

	5	REFERRED TO V +							0.6						ISINK = 8mA
				2	8		V	+
			+
VOLTAGEPIN (V)								VOLTAGE(V)	0.3		TJ = 25°C
		TJ = – 55°C
	4				LT1011	7			0.5	TJ = 125°C
				3		1 RL			0.4
					4
	3					VOUT
					V –
+	1							SATURATION
GROUND	2		TJ = 25°C						0.2			TJ = – 55°C
			TJ = 125°C
TO
									0.1
V
	0	10	20		30	40		50	0	1	2	3	4	5	6	7	8
	0								0
			OUTPUT CURRENT (mA)								INPUT OVERDRIVE (mV)
							1011 G16									1011 G17

Output Leakage Current

		10–7
(A)		10–8			VS = ±15V
CURRENTLEAKAGE	10–10
														VOUT = 35V
		10	–9											VGND = –15V
	10–11
			25			45				65						85				105					125
								TEMPERATURE (°C)
																						1011 G15
			Response Time vs Input Step Size
		1000
					VS = ± 15V
					RL = 500Ω TO 5V
		800			OVERDRIVE = 5mV
(ns)																5V
DELAY					INPUT		3	–						500Ω
		600
PROPAGATION							2	+							7						INPUT
																	FALLING
		400										1
																	RISING INPUT
		200
			0
					1	2		3		4				5		6		7		8		9			10
			0

INPUT STEP (V)

1011 G18

5