Linear Technology LT1881, LT1882 Datasheet

FEATURES

Final Electrical Specifications

LT1881/LT1882

Dual and Quad

Rail-to-Rail Output,

Picoamp Input Precision Op Amps

U

DESCRIPTIO

April 2000

■

Offset Voltage: 50µV Maximum (LT1881A)

■

Input Bias Current: 200pA Maximum (LT1881A)

■

Offset Voltage Drift: 0.8µV/°C Maximum

■

Rail-to-Rail Output Swing

■

Supply Range: 2.7V to 36V

■

Operates with Single or Split Supplies

■

Open-Loop Voltage Gain: 1 Million Minimum

■

1mA Maximum Supply Current Per Amplifier

■

Stable at AV = 1, CL = 1000pF

■

Standard Pinouts

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APPLICATIO S

■

Thermocouple Amplifiers

■

Bridge Transducer Conditioners

■

Instrumentation Amplifiers

■

Battery-Powered Systems

■

Photo Current Amplifiers

The LT®1881 and LT1882 op amps bring high accuracy
input performance to amplifiers with rail-to-rail output
swing. Input bias currents and capacitive load driving
capabilities are superior to the similar LT1884 and LT1885
amplifiers, at the cost of a slight loss in speed. Input
offset voltage is trimmed to less than 50µV and the low
drift maintains this accuracy over the operating tempera­ture range. Input bias currents are an ultralow 200pA
maximum.

The amplifiers work on any total power supply voltage
between 2.7V and 36V (fully specified from 5V to ±15V).
Output voltage swings to within 40mV of the negative
supply and 220mV of the positive supply make these
amplifiers good choices for low voltage single supply
operation.

Capacitive loads up to 1000pF can be driven directly in
unity-gain follower applications.

The dual LT1881 and LT1881A are available with standard
pinouts in S8 and PDIP packages. The quad LT1882 is in
a 14-pin SO package. For a higher speed device with
similar DC specifications, see the LT1884/LT1885.

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

TYPICAL APPLICATIO

16-Bit Voltage Output DAC on ±5V Supply

1.65k

LT1634

4.096V

+

LT1881

–

5V

–5V

R

COM

LTC®1597

REFR1

U

TC VOS Distribution, Industrial Grade

5V

R

OFS

DAC

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen­tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

33pF

–

+

LT1881

–5V

5V

V

OUT

–4.096V
TO 4.096V

1881/2 TA01

26
24

VS = ±15V

22

40 N8 (1 LOT)

20

144 S8 (2 LOTS)

18

184 TOTAL PARTS

16
14
12
10

8

PERCENT OF UNITS (%)

6
4
2
0

1 –0.8 –0.6 –0.4 –0.2 0 0.2 0.4 0.6 0.8–0.9 –0.7 –0.5 –0.3 –0.1 0.1 0.3 0.5 0.7 0.9 1

INPUT OFFSET VOLTAGE DRIFT (µV/°C)

1881/2 TA01a

1

LT1881/LT1882

WW

W

ABSOLUTE AXI U RATI GS

U

(Note 1)

Supply Voltage (V+ to V–) ....................................... 40V

Differential Input Voltage (Note 2) .........................±10V

Input Voltage .................................................... V+ to V

Input Current (Note 2) ........................................ ±10mA

Output Short-Circuit Duration (Note 3)............ Indefinite

UUW

PACKAGE/ORDER I FOR ATIO

TOP VIEW

OUT A

1

–IN A

2

+IN A

N8 PACKAGE
8-LEAD PDIP

T
T

A

3

–

V

4

= 150°C, θJA = 130°C/W (N8)

JMAX

= 150°C, θJA = 190°C/W (S8)

JMAX

+

V

8

OUT B

7

–IN B

6

B

+IN B

5

S8 PACKAGE

8-LEAD PLASTIC SO

ORDER PART NUMBER

LT1881CN8
LT1881IN8
LT1881CS8
LT1881IS8
LT1881ACN8
LT1881AIN8
LT1881ACS8
LT1881AIS8

S8 PART MARKING

Operating Temperature Range (Note 4) .. –40°C to 85°C
Specified Temperature Range (Note 5)... – 40°C to 85°C

–

Maximum Junction Temperature .......................... 150°C

Storage Temperature Range ................. –65°C to 150°C

Lead Temperature (Soldering, 10 sec).................. 300°C

1

OUT A

2

–IN A

3

+IN A

+

4

V

5

+IN B

6

–IN B

7

OUT B

14-LEAD PLASTIC SO

T

JMAX

TOP VIEW

14
13

DA

12
11
10

DB

9
8

S PACKAGE

= 150°C, θJA = 150°C/W

OUT D
–IN D
+IN D

–

V
+IN C
–IN C
OUT C

ORDER PART NUMBER

LT1882CS
LT1882IS

1881
1881I
1881A
1881AI

Consult factory for Military grade parts.

ELECTRICAL CHARACTERISTICS

The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
Single supply operation VEE = 0, VCC = 5V; VCM = VCC/2 unless otherwise noted. (Note 5)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

I

OS

Input Offset Voltage (LT1881A) 25 50 µV

< 70°C ● 85 µV

0°C < T

A

–40°C < T

Input Offset Voltage (LT1881/LT1882) 30 80 µV

0°C < T
–40°C < T

Input Offset Voltage Drift 0°C < TA < 70°C ● 0.3 0.8 µV/°C
(Note 6) –40°C < T

Input Offset Current (LT1881A) 100 200 pA

0°C < T
–40°C < T

Input Offset Current (LT1881/LT1882) 150 500 pA

0°C < T
–40°C < T

< 85°C ● 110 µV

A

< 70°C ● 125 µV

A

< 85°C ● 150 µV

A

< 85°C ● 0.3 0.8 µV/°C

A

< 70°C ● 250 pA

A

< 85°C ● 300 pA

A

< 70°C ● 600 pA

A

< 85°C ● 700 pA

A

2

LT1881/LT1882

ELECTRICAL CHARACTERISTICS

The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
Single supply operation VEE = 0, VCC = 5V; VCM = VCC/2 unless otherwise noted. (Note 5)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

I

B

e

n

i

n

V

CM

CMRR Common Mode Rejection Ratio 1V < VCM < 4V 106 128 dB

PSRR Power Supply Rejection Ratio VEE = 0, VCM = 1.5V; 2.7V < VCC < 32V ● 106 132 dB

A

VOL

V

OL

V

OH

I

S

I

SC

GBW Gain-Bandwidth Product f = 20kHz 0.5 1.0 MHz
t

S

+

SR

–

SR

Input Bias Current (LT1881A) 100 200 pA

< 70°C ● 250 pA

0°C < T

A

–40°C < T

< 85°C ● 300 pA

A

Input Bias Current (LT1881/LT1882) 150 500 pA

< 70°C ● 600 pA

0°C < T

A

–40°C < T

Input Noise Voltage 0.1Hz to 10Hz 0.5 µV

< 85°C ● 700 pA

A

P-P

Input Noise Voltage Density f = 1kHz 14 nV/√Hz
Input Noise Current Density f = 1kHz 0.03 pA/√Hz
Input Voltage Range VEE + 1.0 VCC – 1.0 V

1.2V < V

● V

< 3.8V ● 104 dB

CM

+ 1.2 VCC – 1.2 V

EE

Minimum Operating Supply Voltage ● 2.4 2.7 V
Large-Signal Voltage Gain RL = 10k; 1V < V

RL = 2k; 1V < V

RL = 1k; 1V < V

< 4V 500 1600 V/mV

OUT

< 4V 300 800 V/mV

OUT

< 4V 250 400 V/mV

OUT

● 350 V/mV

● 250 V/mV

● 200 V/mV

Output Voltage Swing Low No Load ● 20 40 mV

I

= 100µA ● 25 50 mV

SINK

= 1mA ● 70 150 mV

I

SINK

= 5mA ● 270 600 mV

I

SINK

Output Voltage Swing High No Load ● 120 220 mV
(Referred to V

)I

CC

= 100µA ● 130 230 mV

SOURCE

I

= 1mA ● 180 300 mV

SOURCE

= 5mA ● 360 600 mV

I

SOURCE

Supply Current Per Amplifier VCC = 3V 0.45 0.65 0.85 mA

● 1.2 mA

VCC = 5V 0.5 0.65 0.9 mA

● 1.4 mA

VCC = 12V 0.5 0.70 1.0 mA

● 1.5 mA

Short-Circuit Current V

Settling Time 0.01%, V

Short to GND ● 15 30 mA

OUT

Short to V

V

OUT

= –1, RL = 2k

A

V

CC

= 1.5V to 3.5V, 30 µs

OUT

● 15 30 mA

Slew Rate Positive AV = –1 0.15 0.35 V/µs

● 0.12 V/µs

Slew Rate Negative AV = –1 0.11 0.18 V/µs

● 0.08 V/µs

3

LT1881/LT1882

ELECTRICAL CHARACTERISTICS

The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
Single supply operation VEE = 0, VCC = 5V; VCM = VCC/2 unless otherwise noted. (Note 5)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

∆V

OS

∆IB+ Noninverting Bias Current Match (Notes 7, 8) 200 300 pA

∆CMRR Common Mode Rejection Match (Notes 7, 9) ● 102 125 dB
∆PSRR Power Supply Rejection Match VEE = 0V, VCM = 1.5V, 2.7V < VCC < 32V, ● 104 126 dB

Offset Voltage Match (LT1881A) (Note 7) 30 70 µV

0°C < T

< 70°C ● 125 µV

A

–40°C < T

< 85°C ● 160 µV

A

Offset Voltage Match (LT1881/LT1882) (Note 7) 35 125 µV

< 70°C ● 175 µV

0°C < T

A

–40°C < T

< 85°C ● 235 µV

A

Offset Voltage Match Drift (Notes 6, 7) ● 0.4 1.2 µV/°C

(LT1881A) 0°C < T

< 70°C ● 400 pA

A

–40°C < T

< 85°C ● 500 pA

A

Noninverting Bias Current Match (Notes 7, 8) 250 700 pA
(LT1881/LT1882) 0°C < T

< 70°C ● 900 pA

A

–40°C < T

< 85°C ● 1000 pA

A

(Notes 7, 9)

The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
Split supply operation VS = ±15V, VCM = 0V unless otherwise noted. (Note 5)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

I

OS

I

B

e

n

i

n

V

CM

Input Offset Voltage (LT1881A) 25 50 µV

< 70°C ● 85 µV

0°C < T

A

–40°C < T

< 85°C ● 110 µV

A

Input Offset Voltage (LT1881/LT1882) 30 80 µV

0°C < T

< 70°C ● 125 µV

A

–40°C < T

< 85°C ● 150 µV

A

Input Offset Voltage Drift 0°C < TA < 70°C ● 0.3 0.8 µV/°C
(Note 6) –40°C < T

< 85°C ● 0.3 0.8 µV/°C

A

Input Offset Current (LT1881A) 150 200 pA

< 70°C ● 250 pA

0°C < T

A

–40°C < T

< 85°C ● 300 pA

A

Input Offset Current (LT1881/LT1882) 150 500 pA

< 70°C ● 600 pA

0°C < T

A

–40°C < T

< 85°C ● 700 pA

A

Input Bias Current (LT1881A) 150 200 pA

0°C < T

< 70°C ● 250 pA

A

–40°C < T

< 85°C ● 300 pA

A

Input Bias Current (LT1881/LT1882) 150 500 pA

< 70°C ● 600 pA

0°C < T

A

–40°C < T

Input Noise Voltage 0.1Hz to 10Hz 0.5 µV

< 85°C ● 700 pA

A

P-P

Input Noise Voltage Density f = 1kHz 14 nV/√Hz
Input Noise Current Density f = 1kHz 0.03 pA/√Hz
Input Voltage Range VEE + 1.0 VCC – 1.0 V

● V

+ 1.2 VCC – 1.2 V

EE

4