LINEAR TECHNOLOGY LT1885 Technical data

FEATURES

LT1884/LT1885

Dual/Quad Rail-to-Rail

Output, Picoamp Input

Precision Op Amps

U

DESCRIPTIO

■

Offset Voltage: 50µV Max (LT1884A)

■

Input Bias Current: 400pA Max (LT1884A)

■

Offset Voltage Drift: 0.8µV/°C Max

■

Rail-to-Rail Output Swing

■

Operates with Single or Split Supplies

■

Open-Loop Voltage Gain: 1 Million Min

■

1mA Maximum Supply Current Per Amplifier

■

Slew Rate: 1V/µs

■

Standard Pinouts

U

APPLICATIO S

■

Thermocouple Amplifiers

■

Bridge Transducer Conditioners

■

Instrumentation Amplifiers

■

Battery-Powered Systems

■

Photo Current Amplifiers

■

Precision Integrators

■

Precision Current Sources

The LT®1884/LT1885 op amps bring high accuracy input
performance to amplifiers with rail-to-rail output swing
while providing faster response than other precision am-

plifiers. 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
400pA 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.

Slew rates of 1V/µs with a supply current of less than 1mA

per amplifier give superior response and settling time
performance in a low power precision amplifier.

The dual LT1884 is available with standard pinouts in
8-pin SO and PDIP packages. The quad LT1885 is also in
the standard pinout 14-pin SO package.

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

TYPICAL APPLICATIO

–IN

GUARD

+IN

U

Input Fault Protected Instrumentation Amplifier

1M

10pF

+

1/4 LT1885

–

1M

22pF

TRIM FOR

AC CMRR

3

+

1/4 LT1885

–

–

1/4 LT1885

5

+

10k

10k

R

G/2

R

G/2

10k

10k

10k

9.76k

–

1/4 LT1885 OUT

+

2•10k

GAIN =

500Ω

TRIM FIRST

FOR DC CMRR

1884 TA01

R

G

1

LT1884/LT1885

TOP VIEW

S PACKAGE

14-LEAD PLASTIC SO

1

2

3

4

5

6

7

14

13

12

11

10

9

8

OUT A

–IN A

+IN A

V

+

+IN B

–IN B

OUT B

OUT D

–IN D

+IN D

V

–

+IN C

–IN C

OUT C

A

D

C

B

WWWU

ABSOLUTE AXI U RATI GS

(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

UU

W

PACKAGE/ORDER I FOR ATIO

ORDER

PART NUMBER

TOP VIEW

OUT A

1

–IN A

2

+IN A

N8 PACKAGE
8-LEAD PDIP

A

3

–

V

4

T

= 150°C, θJA = 130°C/W (N8)

JMAX

T

= 150°C, θJA = 190°C/W (S8)

JMAX

+

8

V

OUT B

7

–IN B

6

B

+IN B

5

S8 PACKAGE

8-LEAD PLASTIC SO

LT1884CN8
LT1884CS8
LT1884ACN8
LT1884ACS8
LT1884IN8
LT1884IS8
LT1884AIN8
LT1884AIS8

S8 PART MARKING

1884
1884A

1884I
1884AI

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

ORDER

PART NUMBER

LT1885CS
LT1885IS

T

= 150°C, θJA = 110°C/W

JMAX

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

2

Input Offset Voltage (LT1884A) 25 50 µV

< 70°C ● 85 µV

0°C < T

A

–40°C < T

Input Offset Voltage (LT1884/LT1885) 30 80 µV

0°C < T
–40°C < T

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

–40°C < T

Input Offset Current (LT1884A) 100 300 pA

Input Offset Current (LT1884/LT1885) 150 900 pA

0°C < T
–40°C < T

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 ● 400 pA

A

< 85°C ● 500 pA

A

< 70°C ● 1200 pA

A

< 85°C ● 1400 pA

A

LT1884/LT1885

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 108 128 dB

PSRR Power Supply Rejection Ratio VEE = 0, VCM = 1.5V

A

VOL

V

OL

V

OH

I

S

I

SC

GBW Gain-Bandwidth Product f = 20kHz 1.2 2 MHz

t

S

+

SR

–

SR

Input Bias Current (LT1884A) 100 400 pA

< 70°C ● 500 pA

0°C < T

A

–40°C < T

< 85°C ● 600 pA

A

Input Bias Current (LT1884/LT1885) 150 900 pA

0°C < T

< 70°C ● 1200 pA

A

–40°C < T

Input Noise Voltage 0.1Hz to 10Hz 0.4 µV

< 85°C ● 1400 pA

A

P-P

Input Noise Voltage Density f = 1kHz 9.5 nV/√Hz
Input Noise Current Density f = 1kHz 0.05 pA/√Hz

Input Voltage Range VEE + 1.0 VCC – 1.0 V

● V

1.2V < V

0°C < T

T

A

< 3.8V ● 106 dB

CM

< 85°C, 2.7V < VCC < 32V ● 108 132 dB

A

= –40°C, 3V < V

< 32V 108 132 dB

CC

+ 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 400 800 V/mV

OUT

< 4V 300 400 V/mV

OUT

● 350 V/mV

● 300 V/mV

● 200 V/mV

Output Voltage Swing Low No Load ● 20 40 mV

= 100µA ● 25 50 mV

I

SINK

= 1mA ● 70 150 mV

I

SINK

I

= 5mA ● 270 600 mV

SINK

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

)I

CC

= 100µA ● 130 230 mV

SOURCE

= 1mA ● 180 300 mV

I

SOURCE

= 5mA ● 360 600 mV

I

SOURCE

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

● 1.30 mA

VCC = 5V 0.50 0.65 0.9 mA

● 1.4 mA

VCC = 12V 0.50 0.70 1.0 mA

● 1.5 mA

Short-Circuit Current V

Settling Time 0.01%, V

Positive Slew Rate A

Negative Slew Rate A

Short to GND ● 15 30 mA

OUT

Short to V

V

OUT

A

= –1, RL = 2k

V

= –1 0.45 0.9 V/µs

V

= –1 0.35 0.7 V/µs

V

CC

= 1.5V to 3.5V, 10 µs

OUT

● 15 30 mA

● 0.36 V/µs

● 0.25 V/µs

3

LT1884/LT1885

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

+ Noninverting Bias Current Match 200 600 pA

B

∆CMRR Common Mode Rejection Match (Notes 7, 9) ● 104 125 dB
∆PSRR Positive Power Supply Rejection Match V

Offset Voltage Match (LT1884A) 30 70 µV

< 70°C ● 125 µV

0°C < T

A

–40°C < T

< 85°C ● 160 µV

A

Offset Voltage Match (LT1884/LT1885) (Note 7) 35 125 µV

< 70°C ● 195 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

(LT1884A) 0°C < T

< 70°C ● 700 pA

A

–40°C < T

< 85°C ● 850 pA

A

Noninverting Bias Current Match (Notes 7, 9) 250 1200 pA

(LT1884/LT1885) 0°C < T

(Notes 7, 9) 0°C < T

< 70°C ● 1600 pA

A

–40°C < T

EE

= –40°C, 3V < V

T

A

< 85°C ● 1900 pA

A

= 0, VCM = 1.5V

< 85°C, 2.7V < VCC < 32V ● 104 126 dB

A

< 32V 104 126 dB

CC

The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
Split supply operation V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

I

OS

I

B

e

n

i

n

V

CM

CMRR Common Mode Rejection Ratio –13.5V < VCM < 13.5V ● 114 130 dB

Input Offset Voltage (LT1884A) 25 50 µV

Input Offset Voltage (LT1884/LT1885) 30 80 µV

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

Input Offset Current (LT1884A) 150 300 pA

Input Offset Current (LT1884/LT1885) 150 900 pA

Input Bias Current (LT1884A) 150 400 pA

Input Bias Current (LT1884/LT1885) 150 900 pA

Input Noise Voltage 0.1Hz to 10Hz 0.4 µV
Input Noise Voltage Density f = 1kHz 9.5 nV/√Hz
Input Noise Current Density f = 1kHz 0.05 pA/√Hz

Input Voltage Range VEE + 1.0 VCC – 1.0 V

= ±15V; V

S

= 0V unless otherwise noted. (Note 5)

CM

< 70°C ● 85 µV

0°C < T

A

–40°C < T

0°C < T
–40°C < T

–40°C < T

0°C < T
–40°C < T

0°C < T
–40°C < T

0°C < T
–40°C < T

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 ● 400 pA

A

< 85°C ● 500 pA

A

< 70°C ● 1200 pA

A

< 85°C ● 1400 pA

A

< 70°C ● 500 pA

A

< 85°C ● 600 pA

A

< 70°C ● 1200 pA

A

< 85°C ● 1400 pA

A

● V

+ 1.2 VCC – 1.2 V

EE

P-P

4