Linear Technology LT2078CS8, LT2078, LT2079I, LT2079C, LT2079 Datasheet

FEATURES

■SO Package with Standard Pinout

■Supply Current per Amplifier: 50μA Max

■Offset Voltage: 70μV Max

■Offset Current: 250pA Max

■Voltage Noise: 0.6μVP-P, 0.1Hz to 10Hz

■Current Noise: 3pAP-P, 0.1Hz to 10Hz

■Offset Voltage Drift: 0.4μV/°C

■Gain Bandwidth Product: 200kHz

■Slew Rate: 0.07V/μs

■Single Supply Operation

Input Voltage Range Includes Ground

Output Swings to Ground while Sinking Current No Pull-Down Resistors Needed

■ Output Sources and Sinks 5mA Load Current

APPLICATIOUS

■Battery or Solar-Powered Systems Portable Instrumentation Remote Sensor Amplifier Satellite Circuitry

■Micropower Sample-and-Hold

■Thermocouple Amplifier

■Micropower Filters

LT2078/LT2079

Micropower, Dual and

Quad, Single Supply,

Precision Op Amps

DESCRIPTIOU

The LT ®2078 is a micropower dual op amp in 8-pin small outline, standard surface mount package, and LT2079 is a micropower quad op amp offered in the standard 14-pin surface mount package. Both devices are optimized for single supply operation at 5V. ±15V specifications are also provided.

Micropowerperformanceofcompetingdevicesisachieved at the expense of seriously degrading precision, noise, speed and output drive specifications. The design effort of the LT2078/LT2079 was concentrated on reducing supply current without sacrificing other parameters. The offset voltage achieved is the lowest on any dual or quad nonchopper stabilized op amp––micropower or otherwise. Offset current, voltage and current noise, slew rate and gain bandwidth product are all two to ten times better than on previous micropower op amps.

Both the LT2078/LT2079 can be operated from a single supply (as low as one lithium cell or two NiCd batteries). The input range goes below ground. The all NPN output stage swings to within a few millivolts of ground while sinking current––no power consuming pull-down resistors are needed. For applications requiring DIP packages refer to the LT1078/LT1079.

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

TYPICAL APPLICATIOU

Single Battery, Micropower, Gain = 100, Instrumentation Amplifier

10.1k

1M

1M

2

3V

–

(Li-Ion)

A

1

10.1k

6

–

8

INVERTING

3

1/2 LT2078

B

7

+

OUT

–INPUT

NONINVERTING

5

1/2 LT2078

+

+INPUT

4

LT2078/79 • TA01

TYPICAL PERFORMANCE

= 85 VP-P 0.1Hz TO 10Hz

OUTPUT NOISE

INPUT OFFSET VOLTAGE = 40 V

INPUT RANGE

= 300 VRMS OVER FULL BANDWIDTH

INPUT OFFSET CURRENT = 0.2nA

= 0.03V TO 1.8V

TOTAL POWER DISSIPATION = 240 W

OUTPUT RANGE = 0.03V TO 2.3V

COMMON MODE REJECTION = 110dB (AMPLIFIER LIMITED)

(0.3mV≤ VIN+ – VIN– ≤ 23mV)

GAIN BANDWIDTH PRODUCT = 200kHz

OUTPUTS SINK CURRENT—NO PULL-DOWN RESISTORS

Distribution of Input Offset Voltage

800 VS = 5V, 0V

700 5000 OP AMPS

AMPS	600
	500
OF OP
	400
NUMBER	300
	200
	100
	0
			–80		–40			40		80
	–120						0					120
				INPUT OFFSET VOLTAGE ( V)								2078/79 • TA02

1

LT2078/LT2079

ABSOLUTE

WAXIWUW

RATINGSU

Supply Voltage	......................................................	±22V	Specified Temperature Range
Differential Input Voltage .......................................		±30V	Commercial .............................................	0°C to 70°C
Input Voltage ...............	Equal to Positive Supply Voltage		Industrial ............................................	– 40°C to 85°C
............	5V Below Negative Supply Voltage		Storage Temperature Range .................	– 65°C to 150°C
Output Short-Circuit ..........................Duration		Indefinite	Lead Temperature (Soldering, 10 sec)..................	300°C

PACKAGE/ORDER IUFORWATIOU

TOP VIEW

OUT A	1	8	V+
–IN A	2	7	OUT B
+IN A	3	A	–IN B
		6
V–	4	B	+IN B
		5

S8 PACKAGE

8-LEAD PLASTIC SO

TJMAX = 150°C, θJA = 190°C/ W

ORDER PART

NUMBER

LT2078ACS8

LT2078AIS8

LT2078CS8

LT2078IS8

PART MARKING

2078A 2078 2078AI 2078I

TOP VIEW

OUT A	1	14	OUT D
–IN A	2	13	–IN D
	A	D
+IN A	3	12	+IN D
V+	4	11	V–
+IN B	5	10	+IN C
–IN B	B	C	–IN C
	6	9
OUT B	7	8	OUT C

S PACKAGE

14-LEAD PLASTIC SO

TJMAX = 150°C, θJA = 150°C/ W

ORDER PART

NUMBER

LT2079AC

LT2079AI

LT2079C

LT2079I

Consult factory for Military grade parts.

ELECTRICAL CHARACTERISTICS VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, TA = 25°C, unless otherwise noted.

				LT2078AC/LT2078AI			LT2078C/LT2078I
				LT2079AC/LT2079AI			LT2079C/LT2079I
SYMBOL		PARAMETER	CONDITIONS (NOTE 1)	MIN	TYP	MAX	MIN	TYP	MAX	UNITS
VOS		Input Offset Voltage	LT2078		30	70		40	120		mV
			LT2079		35	110		40	150		mV
DVOS		Long Term Input Offset			0.4			0.5		mV/Mo
DTime		Voltage Stability
IOS		Input Offset Current			0.05	0.25		0.05	0.35		nA
IB		Input Bias Current			6	8		6	10		nA
en		Input Noise Voltage	0.1Hz to 10Hz (Note 2)		0.6	1.2		0.6		mVP-P
		Input Noise Voltage Density	fO = 10Hz (Note 2)		29	45		29		nVÖ
											Hz
			fO = 1000Hz (Note 2)		28	37		28		nVÖHz
in		Input Noise Current	0.1Hz to 10Hz (Note 2)		2.3	4.0		2.3		pAP-P
		Input Noise Current Density	fO = 10Hz (Note 2)		0.06	0.10		0.06		pAÖ
											Hz
			fO = 1000Hz		0.02			0.02		pAÖHz
		Input Resistance	(Note 3)							MW
		Differential Mode		400	800		300	800
		Common Mode			6			6		GW
		Input Voltage Range		3.5	3.8		3.5	3.8			V
				0	– 0.3		0	– 0.3			V
CMRR		Common Mode Rejection Ratio	VCM = 0V to 3.5V	95	110		92	108		dB
PSRR		Power Supply Rejection Ratio	VS = 2.3V to 12V	100	114		98	114			dB

2

LT2078/LT2079

ELECTRICAL CHARACTERISTICS VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, TA = 25°C, unless otherwise noted.

			LT2078AC/LT2078AI			LT2078C/LT2078I
			LT2079AC/LT2079AI			LT2079C/LT2079I
SYMBOL	PARAMETER	CONDITIONS (NOTE 1)	MIN	TYP	MAX	MIN	TYP	MAX	UNITS
AVOL	Large-Signal Voltage Gain	VO = 0.03V to 4V, No Load	200	1000		150	1000		V/mV
		VO = 0.03V to 3.5V, RL = 50k	150	600		120	600		V/mV
	Maximum Output Voltage	Output Low, No Load		3.5	6		3.5	6	mV
	Swing	Output Low, 2k to GND		0.55	1.0		0.55	1.0	mV
		Output Low, ISINK = 100μA		95	130		95	130	mV
		Output High, No Load	4.2	4.4		4.2	4.4		V
		Output High, 2k to GND	3.5	3.9		3.5	3.9		V
SR	Slew Rate	AV = 1, VS = ±2.5V	0.04	0.07		0.04	0.07		V/μs
GBW	Gain Bandwidth Product	fO ≤ 20kHz		200			200		kHz
IS	Supply Current per Amplifier			38	50		39	55	μA
	Channel Separation	VIN = 3V, RL = 10k, f ≤ 10Hz		110			110		dB
	Minimum Supply Voltage	(Note 4)		2.2	2.3		2.2	2.3	V

VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, – 40°C ≤ TA ≤ 85°C for I grades, unless otherwise noted.

						LT2078AI/LT2079AI			LT2078I/LT2079I
	SYMBOL		PARAMETER	CONDITIONS		MIN	TYP	MAX	MIN	TYP	MAX	UNITS
	VOS		Input Offset Voltage	LT2078	●		70	250		95	370	μV
				LT2079	●		80	280		100	400	μV
	VOS		Input Offset Voltage Drift	LT2078	●		0.4	1.8		0.5	2.5	μV/°C
	T		(Note 5)	LT2079	●		0.6	3.0		0.6	3.5	μV/°C
	IOS		Input Offset Current		●		0.07	0.70		0.1	1.0	nA
	IB		Input Bias Current		●		7	10		7	12	nA
	CMRR		Common Mode Rejection Ratio	VCM = 0.05V to 3.2V	●	90	106		86	104		dB
	PSRR		Power Supply Rejection Ratio	VS = 3.1V to 12V	●	96	110		92	110		dB
	AVOL		Large-Signal Voltage Gain	VO = 0.05V to 4V, No Load	●	110	600		80	600		V/mV
				VO = 0.05V to 3.5V, RL = 50k	●	80	400		60	400		V/mV
			Maximum Output Voltage	Output Low, No Load	●		4.5	8		4.5	8	mV
			Swing	Output Low, ISINK = 100μA	●		125	170		125	170	mV
				Output High, No Load	●	3.9	4.2		3.9	4.2		V
				Output High, 2k to GND	●	3.0	3.7		3.0	3.7		V
	IS		Supply Current per Amplifier		●		43	60		45	70	μA

VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, 0°C ≤ TA ≤ 70°C, unless otherwise noted (Note 6).

																	LT2078AC/LT2079AC			LT2078C/LT2079C
SYMBOL	PARAMETER														CONDITIONS		MIN	TYP	MAX	MIN	TYP	MAX	UNITS
VOS	Input Offset Voltage														LT2078	●		50	150		60	240	μV
															LT2079	●		60	180		70	270	μV
VOS	Input Offset Voltage Drift														LT2078	●		0.4	1.8		0.5	2.5	μV/°C
T	(Note 5)														LT2079	●		0.5	3.0		0.6	3.5	μV/°C
IOS	Input Offset Current															●		0.06	0.35		0.06	0.50	nA
IB	Input Bias Current															●		6	9		6	11	nA
CMRR	Common Mode Rejection Ratio														VCM = 0V to 3.4V	●	92	108		88	106		dB
PSRR	Power Supply Rejection Ratio														VS = 2.6V to 12V	●	98	112		95	112		dB
																							3

LT2078/LT2079

ELECTRICAL CHARACTERISTICS VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, 0°C ≤ TA ≤ 70°C, unless otherwise noted.

					LT2078AC/LT2079AC			LT2078C/LT2079C
	SYMBOL	PARAMETER	CONDITIONS		MIN	TYP	MAX	MIN	TYP	MAX	UNITS
	AVOL	Large-Signal Voltage Gain	VO = 0.05V to 4V, No Load	●	150	750		110	750		V/mV
			VO = 0.05V to 3.5V, RL = 50k	●	110	500		80	500		V/mV
		Maximum Output Voltage	Output Low, No Load	●		4.0	7		4.0	7	mV
		Swing	Output Low, ISINK = 100μA	●		105	150		105	150	mV
			Output High, No Load	●	4.1	4.3		4.1	4.3		V
			Output High, 2k to GND	●	3.3	3.8		3.3	3.8		V
	IS	Supply Current per Amplifier		●		40	55		42	63	μA

VS = ±15V, TA = 25°C, unless otherwise noted.

			LT2078AC/LT2078AI			LT2078C/LT2078I
			LT2079AC/LT2079AI			LT2079C/LT2079I
SYMBOL	PARAMETER	CONDITIONS	MIN	TYP	MAX	MIN	TYP	MAX	UNITS
VOS	Input Offset Voltage	LT2078		50	250		70	350	μV
		LT2079		60	350		80	450	μV
IOS	Input Offset Current			0.05	0.25		0.05	0.35	nA
IB	Input Bias Current			6	8		6	10	nA
	Input Voltage Range		13.5	13.8		13.5	13.8		V
			–15.0	–15.3		–15.0	–15.3		V
CMRR	Common Mode Rejection Ratio	VCM = 13.5V, –15V	98	114		95	114		dB
PSRR	Power Supply Rejection Ratio	VS = 5V, 0V to ±18V	100	114		98	114		dB
AVOL	Large-Signal Voltage Gain	VO = ±10V, RL = 50k	1000	5000		1000	5000		V/mV
		VO = ±10V, RL = 2k	400	1100		300	1100		V/mV
VOUT	Maximum Output Voltage	RL = 50k	±13.0	±14.0		±13.0	±14.0		V
	Swing	RL = 2k	±11.0	±13.2		±11.0	±13.2		V
SR	Slew Rate		0.06	0.10		0.06	0.10		V/μs
IS	Supply Current per Amplifier			46	65		47	75	μA

VS = ±15V, – 40°C ≤ TA ≤ 85°C for I grades, unless otherwise noted.

					LT2078AI/LT2079AI			LT2078I/LT2079I
SYMBOL		PARAMETER	CONDITIONS		MIN	TYP	MAX	MIN	TYP	MAX	UNITS
VOS		Input Offset Voltage	LT2078	●		90	430		120	600	μV
			LT2079	●		100	500		130	700	μV
VOS		Input Offset Voltage Drift	LT2078	●		0.5	1.8		0.6	2.5	μV/°C
T		(Note 5)	LT2079	●		0.6	3.0		0.7	3.8	μV/°C
IOS		Input Offset Current		●		0.07	0.70		0.1	1.0	nA
IB		Input Bias Current		●		7	10		7	12	nA
AVOL		Large-Signal Voltage Gain	VO = ±10V, RL = 5k	●	200	700		150	700		V/mV
CMRR		Common Mode Rejection Ratio	VCM = 13V, –14.9V	●	92	110		88	110		dB
PSRR		Power Supply Rejection Ratio	VS = 5V, 0V to ±18V	●	96	110		92	110		dB
		Maximum Output Voltage Swing	RL = 5k	●	±11.0	±13.5		±11.0	±13.5		V
IS		Supply Current per Amplifier		●		52	80		54	95	μA

4

LT2078/LT2079

ELECTRICAL CHARACTERISTICS			VS = ±15V, 0°C ≤ TA ≤ 70°C, unless otherwise noted (Note 6).
					LT2078AC/LT2079AC			LT2078C/LT2079C
SYMBOL	PARAMETER	CONDITIONS			MIN	TYP	MAX	MIN	TYP	MAX	UNITS
VOS	Input Offset Voltage	LT2078		●		70	330		90	460	μV
		LT2079		●		80	410		100	540	μV
VOS	Input Offset Voltage Drift	LT2078		●		0.5	1.8		0.6	2.5	μV/°C
T	(Note 5)	LT2079		●		0.6	3.0		0.7	3.8	μV/°C
IOS	Input Offset Current			●		0.06	0.35		0.06	0.50	nA
IB	Input Bias Current			●		6	9		6	11	nA
AVOL	Large-Signal Voltage Gain	VO = ±10V, RL = 5k		●	300	1200		250	1200		V/mV
CMRR	Common Mode Rejection Ratio	VCM = 13V, –15V		●	95	112		92	112		dB
PSRR	Power Supply Rejection Ratio	VS = 5V, 0V to ±18V		●	98	112		95	112		dB
	Maximum Output Voltage Swing	RL = 5k		●	±11.0	±13.6		±11.0	±13.6		V
IS	Supply Current per Amplifier			●		49	73		50	85	μA

The ● denotes specifications which apply over the full operating temperature range.

Note 1: Typical parameters are defined as the 60% yield of parameter distributions of individual amplifiers, i.e., out of 100 LT2079s (or 100 LT2078s) typically 240 op amps (or 120) will be better than the indicated specification.

Note 2: This parameter is tested on a sample basis only. All noise parameters are tested with VS = ±2.5V, VO = 0V.

Note 3: This parameter is guaranteed by design and is not tested. Note 4: Power supply rejection ratio is measured at the minimum supply

voltage. The op amps actually work at 1.8V supply but with a typical offset skew of –300μV.

Note 5: This parameter is not 100% tested.

Note 6: The LT2078C/LT2079C are designed, characterized and expected to meet the industrial temperature limits, but are not tested at – 40°C and 85°C. I-grade parts are guaranteed.

TYPICAL PERFORWAUCE CHARACTERISTICS

PERCENT OF UNITS (%)

Distribution of Offset Voltage

Drift with Temperature

25

VS = 5V, 0V

VCM = 0.1V

2080 LT2078'S

25 LT2079'S

= 260 OP AMPS

15

10

5

0

–2

–1

0

1

2

OFFSET VOLTAGE DRIFT WITH TEMPERATURE ( V/°C)

LT2078/79 • TPC01

BIAS CURRENT (nA) OFFSET CURRENT (pA)

Input Bias and Offset Currents vs	Input Bias Current vs
Temperature	Common Mode Voltage

100

0

VS = 5V, 0V TO ±15V

VS = 5V, 0V

50

IOS

(nA)

–2

TA = 125°C

TA = –55°C

0

CURRENT

–4

–6

TA = 25°C

–5

BIAS

IB

INPUT

–8

–6

–10

–7

25

50

125

–12

–50

–25

0

75

100

–1

0

1

2

3

4

TEMPERATURE (°C)

COMMON MODE VOLTAGE (V)

LT2078/79 • TPC02

LT2078/79 • TPC03

5