Analog Devices AD8677 Service Manual

p

130 μV Maximum Offset Voltage

O

Amp in TSOT

FEATURES PIN CONFIGURATIONS

Low offset voltage: 130 µV max
Input offset drift: 1.5 µV/°C max
Low noise: 0.25 V p-p
High gain, CMRR and PSRR: 115 dB min
Low supply current: 1.1 mA
Wide supply voltage range: ±4 V to ±18 V operation

APPLICATIONS

Medical and industrial instrumentation
Sensors and controls

Thermocouple
RTDs
Strain bridges
Shunt current measurements

Precision filters

GENERAL DESCRIPTION

The AD8677 is the next generation of precision, ultralow offset
amplifiers. It builds on the high performance of the OP07 and
integrates lower power (1.1 mA typical), lower input bias
current (±1 nA maximum), and higher CMRR/PSRR (130 dB)
in the small TSOT package. Operation is fully specified from ±5
V to ±15 V supply.

1

OUT

+IN

NULL

Figure 2. 8-Lead SOIC_N (R-8)

AD8677

V–

2

TOP VIEW

(Not to Scale)

3

Figure 1. 5-Lead TSOT (UJ-5)

1

2

–IN

AD8677

TOP VIEW

3

+IN

(Not to Scale)

4

V–

NC = NO CONNECT

5

4

8

7

6

5

V+

–IN

05578-001

NULL

V+

OUT

NC

AD8677

05578-002

The AD8677 provides higher accuracy than industry-standard
OP07-type amplifiers due to Analog Devices’ iPolar™ process,
which supports enhanced performance in a smaller footprint.
These performance enhancements include wider output swing,
lower power, and higher CMRR (common-mode rejection
ratio) and PSRR (power supply rejection ratio). The AD8677
maintains stability of offsets and gain virtually regardless of
variations in time or temperature. Excellent linearity and gain
accuracy can be maintained at high closed-loop gains.

The AD8677 is fully specified over the extended industrial tem­perature range of −40°C to +125°C. The AD8677 amplifier is
available in the tiny, 5-lead TSOT and the popular 8-lead,
narrow SOIC lead-free packages.

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] © 2005 Analog Devices, Inc. All rights reserved.

AD8677

TABLE OF CONTENTS

Features.............................................................................................. 1

Absolute Maximum Ratings ............................................................5

Applications....................................................................................... 1

General Description ......................................................................... 1

Pin Configurations ........................................................................... 1

Revision History ............................................................................... 2

Specifications..................................................................................... 3

REVISION HISTORY

11/05—Revision 0: Initial Version

Thermal Resistance.......................................................................5

ESD Caution...................................................................................5

Typical Performance Characteristics..............................................6

Outline Dimensions....................................................................... 13

Ordering Guide .......................................................................... 13

Rev. 0 | Page 2 of 16

AD8677

SPECIFICATIONS

VS = ±5.0 V, TA = +25°C, unless otherwise specified.

Table 1.

Parameter Symbol Test Conditions/Comments Min Typ Max Unit

INPUT CHARACTERISTICS

Offset Voltage VOS 40 130 μV

Input Bias Current

I

B

−40°C ≤ TA ≤ +125°C

0.2 1 nA

−40°C ≤ TA ≤ +125°C

Input Offset Current IOS 0.1 1 nA

−40°C ≤ TA ≤ +125°C

Input Voltage Range −3.5 +3.5 V
Common-Mode Rejection Ratio CMRR

Open-Loop Gain AVO

/ΔT −40°C ≤ TA ≤ +125°C

ΔV

OS

= ±3 V

V

CM

−40°C ≤ TA ≤ +125°C
= 2 kΩ to ground, VO = ±3 V

R

L

−40°C ≤ TA ≤ +125°C

OUTPUT CHARACTERISTICS

Output Voltage Swing V

OUT

= 10 kΩ to ground ±3.95 ±4.1

R

L

−40°C ≤ TA ≤ +125°C ±3.95
= 2 kΩ to ground ±3.9 ±4

R

L

−40°C ≤ TA ≤ +125°C ±3.9

Short-Circuit Limit ISC 27 mA
Output Current IO V

= 3.5 V 15 mA

O

POWER SUPPLY

Power Supply Rejection Ratio PSRR

Supply Current/Amplifier ISY V

= ±4.0 V to ±18.0 V

V

S

−40°C ≤ TA ≤ +125°C

= 0 V 1.1 1.25 mA

O

−40°C ≤ TA ≤ +125°C

DYNAMIC PERFORMANCE

Slew Rate SR

= 10 kΩ

R

L

Gain Bandwidth Product GBP 0.6 MHz
Phase Margin 80 Degrees

NOISE PERFORMANCE

Voltage Noise e

0.1 Hz to 10 Hz 0.28 μV p-p

n p-p

Voltage Noise Density en f = 1 kHz 10
Current Noise Density in f = 1 kHz 0.074

350 μV

1 nA

1 nA

120 127 dB

120 dB
1000 10000 V/mV
1000 V/mV

0.5 1.4 μV/°C

V

V

V

V

115 130 dB
110 dB

1.7 mA

0.2 V/μs

nV/√Hz
pA/√Hz

Rev. 0 | Page 3 of 16

AD8677

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

Table 2.

Parameter Symbol Test Conditions/Comments Min Typ Max Unit

INPUT CHARACTERISTICS

Offset Voltage VOS 45 130 μV

Input Bias Current

I

B

−40°C ≤ TA ≤ +125°C

0.2 1 nA

−40°C ≤ TA ≤ +125°C

Input Offset Current IOS 0.2 1 nA

−40°C ≤ TA ≤ +125°C

Input Voltage Range −13.5 +13.5 V
Common-Mode Rejection Ratio CMRR VCM = ±13.0 V 120 140 dB

Open Loop Gain AVO

Offset Voltage Drift

/ΔT −40°C ≤ TA ≤ +125°C

ΔV

OS

−40°C ≤ TA ≤ +125°C
= 2 kΩ to ground, VO = ±11 V

R

L

−40°C ≤ TA ≤ +125°C

OUTPUT CHARACTERISTICS

Output Voltage Swing V

OUT

= 10 kΩ to ground ±13.95

R

L

−40°C ≤ TA ≤ +125°C ±13.9
= 2 kΩ to ground ±13.75

R

L

−40°C ≤ TA ≤ +125°C ±13.7

Short Circuit Limit ISC 30 mA
Output Current IO V

= 13.5 V 15 mA

O

POWER SUPPLY

Power Supply Rejection Ratio PSRR

Supply Current/Amplifier ISY V

= ±4.0 V to ±18.0 V

V

S

−40°C ≤ TA ≤ +125°C

= 0 V 1.1 1.3 mA

O

−40°C ≤ TA ≤ +125°C

DYNAMIC PERFORMANCE

Slew Rate SR

= 10 kΩ

R

L

Gain Bandwidth Product GBP 0.6 MHz
Phase Margin 80 Degrees

NOISE PERFORMANCE

Voltage Noise e

0.1 Hz to 10 Hz 0.25 μV p-p

n p-p

Voltage Noise Density en f = 1 kHz 10
Current Noise Density in f = 1 kHz 0.074

350 μV

1 nA

1 nA

120 dB
1000 10000 V/mV
1000 V/mV

0.5 1.5 μV/°C

14 V
V

13.8 V
V

115 130 dB
110 dB

1.8 mA

0.2 V/μs

nV/√Hz
pA/√Hz

Rev. 0 | Page 4 of 16

AD8677

ABSOLUTE MAXIMUM RATINGS

Table 3.

Parameter Value

Supply Voltage ±18 V
Input Voltage ±V Supply
Differential Input Voltage ±0.7 V
Output Short-Circuit Duration to GND Indefinite
Storage Temperature Range

UJ-5, R Package −65°C to +150°C
Operating Temperature Range −40°C to +125°C
Junction Temperature Range

RM, R Package −65°C to +150°C
Lead Temperature (Soldering, 10 sec) +300°C

ESD CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.

Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.

THERMAL RESISTANCE

θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.

Table 4.

5-Lead TSOT (UJ-5) 207 61 °C/W
8-Lead SOIC (R-8) 158 43 °C/W

JA

θ

Unit Package Type θ

JC

Rev. 0 | Page 5 of 16