Analog Devices AD8563 Service Manual

1.8 V to 5 V Auto-Zero,

In-Amp with Shutdown

Preliminary Technical Data

FEATURES

Low offset voltage: 25 μV max Low input offset drift: 0.1 μV/°C max High CMR: 120 dB min @ G = 100 Low noise: 0.7 μV p-p from 0.01 Hz to 10 Hz Wide gain range: 1 to 10,000 Single-supply operation: +2.7 V to +5.5 V Rail-to-rail output Shutdown capability

−40°C to +125°C operation

APPLICATIONS

Strain gauge Weigh scales Pressure sensors Laser diode control loops Portable medical instruments Thermocouple amplifiers

AD8563

PIN CONFIGURATION

1

RGA

2

P

VIN

VCC

VFB

AD8563

3

T O P

4

VO

(Not to Scale)

5

Figure 1. 10-Lead MSOP

VIEW

10

9 8

7 6

RGB

VINN

GND V

REF

ENABLE

GENERAL DESCRIPTION

The AD85631 is a precision instrumentation amplifier featuring low noise, rail-to-rail output and a power-saving shutdown mode. The AD8563 also features low offset voltage and drift coupled with high common-mode rejection. In shutdown mode, the total supply current is reduced to less than 4 µA. The AD8563 is capable of operating from 2.7 V to 5.5 V.

With a low offset voltage of 30 µV, an offset voltage drift of

0.5 µV/°C, and a voltage noise of only 1 µV p-p (0.01 Hz to 10 Hz), the AD8563 is ideal for applications where error sources cannot be tolerated. Precision instrumentation, position and pressure sensors, medical instrumentation, and strain gauge amplifiers benefit from the low noise, low input bias current, and high common-mode rejection. The small footprint and low cost are ideal for high volume applications.

The small package and low power consumption allow maximum channel density and minimum board size for space-critical equipment and portable systems.

The AD8563 is specified over the industrial temperature range from −40°C to +125°C. The AD8563 is available in a Pb-free, 10-lead MSOP.

1

Patent pending.

Rev. PrA

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 other 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.

AD8563 Preliminary Technical Data

TABLE OF CONTENTS

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

Gain Selection (Gain-Setting Resistors).....................................7

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

Pin Configuration............................................................................. 1

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

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

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

Electrical Characteristics ............................................................. 3

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

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

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

Typical Performance Characteristics ........ Error! Bookmark not

defined.

Theory of Operation ........................................................................ 6

Applications....................................................................................... 7

High PSR and CMR ..................................................................... 6

1/f Noise Correction .................................................................... 6

Reference Connection ..................................................................7

Disable Function ...........................................................................7

Output Filtering.............................................................................7

Clock Feedthrough........................................................................7

Low Impedance Output................................................................7

Maximizing Performance Through Proper Layout..................8

Power Supply Bypassing...............................................................8

Input Overvoltage Protection......................................................8

Capacitive Load Drive ..................................................................8

Circuit Diagrams/Connections...................................................9

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

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

REVISION HISTORY

06/06—Revision PrA: Initial Version

Rev. PrA | Page 2 of 15

Preliminary Technical Data AD8563

SPECIFICATIONS

ELECTRICAL CHARACTERISTICS

VCC = 5.0 V, VCM = 2.5 V, V resistor values. Temperature specifications guaranteed by characterization.

Table 1.

Parameter Symbol Conditions Min Typ Max Unit

INPUT CHARACTERISTICS

Input Offset Voltage VOS G = 1000 25 μV G = 100 25 μV G = 10 50 μV G = 1 350 μV vs. Temperature ΔVOS/

G = 100, −40°C ≤ TA ≤ +125°C 0.01 0.1 μV/°C G = 10, −40°C ≤ TA ≤ +125°C 0.1 0.3 μV/°C G = 1, −40°C ≤ TA ≤ +125°C 0.7 3 μV/°C

Input Bias Current IB 0.3 1 nA

−40°C ≤ TA ≤ +125°C 2 nA Input Offset Current IOS 2 nA VREF Pin Current I Input Operating Impedance

Differential 75||2 MΩ||pF

Common Mode 100||2 MΩ||pF Input Voltage Range 0 3.0 V Common-Mode Rejection CMR G = 100, VCM = 0 V to 2.85 V 120 140 dB G = 100, VCM = 0 V to 2.85 V, −40°C ≤ TA ≤ +125°C 105 140 G = 10, VCM = 0 V to 2.85 V, −40°C ≤ TA ≤ +125°C 100 120 dB Gain Error G = 100, VCM = 12.125 mV, VO = 0.075 V to 4.925 V 0.25 %

G = 10, VCM = 121.25 mV , VO = 0.075 V to 4.925 V 0.5 %

Gain Drift G = 1, 10, 100, 1000, −40°C ≤ TA ≤ +125°C 50 ppm/°C Nonlinearity G = 100, VCM = 12.125 mV, VO = 0.075 V to 4.925 V 0.006 % FS G = 10, VCM = 121.25 mV, VO = 0.075 V to 4.925 V 0.035 % FS V

Range 0.9 4.1 V

REF

OUTPUT CHARACTERISITICS

Output Voltage High VOH 4.925 V Output Voltage Low VOL 0.075 V Short-Circuit Current ISC ±35 mA

POWER SUPPLY

Power Supply Rejection PSR G = 100, VS = 2.7 V to 5.5 V, VCM = 0 V 100 120 dB G = 10, VS = 2.7 V to 5.5 V, VCM = 0 V 90 106 dB Supply Current ISY I

−40°C ≤ TA ≤ +125°C 1.5 mA Supply Current Shutdown Mode ISD 2 4 μA

ENABLE INPUTS

Logic High Voltage 2.40 V Logic Low Voltage 0.80 V

NOISE PERFORMANCE

Voltage Noise e Voltage Noise Density en G = 100, f = 1 kHz 35 nV/√Hz G = 10, f = 1 kHz 150 nV/√Hz Internal Clock Frequency 40 kHz Signal Bandwidth1 G = 1 to 1000 1 kHz

1

Higher bandwidths result in higher noise.

= VCC/2, VIN = V

REF

ΔT

REF

− V

, R

INP

INN

= 10 kΩ, TA = 25°C, G = 100, unless specified. See Table 5 for gain setting

LOAD

G = 1000, −40°C ≤ TA ≤ +125°C 0.01 0.1 μV/°C

0.02 1 nA

= 0 mA, VIN = 0 V 1.1 1.3 mA

O

f = 0.01 Hz to 10 Hz 0.7 μV p-p

n p-p

Rev. PrA | Page 3 of 15

AD8563 Preliminary Technical Data

VS = 2.7 V, VCM = -0 V, V resistor values. Temperature specifications guaranteed by characterization.

Table 2.

Parameter Symbol Conditions Min Typ Max Unit

INPUT CHARACTERISTICS

Input Offset Voltage VOS G = 1000 30 μV G = 100 30 μV G = 10 60 μV G = 1 500 μV Vs. Temperature ΔVOS/

G = 100, −40°C ≤ TA ≤ +125°C 0.1 0.5 μV/°C G = 10, −40°C ≤ TA ≤ +125°C 3 μV/°C G = 1, −40°C ≤ TA ≤ +125°C 10 μV/°C

Input Bias Current IB 0.3 1 nA

−40°C ≤ TA ≤ +125°C 2 nA Input Offset Current IOS 2 nA VREF Pin Current I

Input Operating Impedance Differential 75||2 MΩ||pF

Common Mode 100||2 MΩ||pF Input Voltage Range 0 0.7 V Common-Mode Rejection CMR G = 100, VCM = 0 V to 0.7 V 100 110 dB G = 100, VCM = 0 V to 0.7 V, −40°C ≤ TA ≤ +125°C 86 G = 10, VCM = 0 V to 0.7 V 86 95 dB Gain Error G = 100, VCM =4.125 mV, VO = 0.075 V to 2.625 V 0.2 0.35 %

G = 10, VCM = 41.25 mV, VO = 0.075 V to 2.625 V 0.2 0.5 %

Gain Drift G = 1, 10, 100, 1000, −40°C ≤ TA ≤ +125°C 50 ppm/°C Nonlinearity G = 100, VCM = 4.125 mV, VO = 0.075 V to 2.625 V 0.015 % FS G = 10, VCM = 41.25 mV, VO = 0.075 V to 2.625 V 0.015 % FS V

Range 0.9 1.8 V

REF

OUTPUT CHARACTERISITICS

Output Voltage High VOH 2.625 V Output Voltage Low VOL 0.075 V Short-Circuit Current ISC ±5 mA

POWER SUPPLY

Power Supply Rejection PSR G = 100, VS = 2.7 V to 5.5 V, VCM = 0 V 100 120 dB Supply Current ISY I

−40°C ≤ TA ≤ +125°C 1.4 mA Supply Current Shutdown Mode ISD 2 4 μA

ENABLE INPUTS

Logic High Voltage 1.4 V Logic Low Voltage 0.5 V

NOISE PERFORMANCE

Voltage Noise e Voltage Noise Density en G = 100, f = 1 kHz 45 nV/√Hz G = 10, f = 1 kHz 180 nV/√Hz Internal Clock Frequency 40 kHz Signal Bandwidth1 G = 1 to 1000 1 kHz

1

Higher bandwidths result in higher noise.

= VS/2, VIN = V

REF

− V

, R

INP

INN

= 10 kΩ, TA = 25°C, G = 100, unless specified. See Table 5 for gain setting

LOAD

G = 1000, −40°C ≤ TA ≤ +125°C 0.1 0.5 μV/°C

ΔT

0.02 1 nA

REF

= 0 mA, VIN = 0 V 0.9 1.2 mA

O

f = 0.01 Hz to 10 Hz 1 μV p-p

n p-p

Rev. PrA | Page 4 of 15

Preliminary Technical Data AD8563

ABSOLUTE MAXIMUM RATINGS

Table 3.

Parameter Ratings

Supply Voltage 6 V Input Voltage +V Differential Input Voltage1 ±V

SUPPLY

Output Short-Circuit Duration to GND Indefinite Storage Temperature Range (RM Package) −65°C to +150°C Operating Temperature Range −40°C to +125°C Junction Temperature Range (RM Package) −65°C to +150°C Lead Temperature Range (Soldering, 10 sec) 300°C

1

Differential input voltage is limited to ±5.0 V, the supply voltage, or

whichever is less.

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

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

Table 4.

Package Type θ

10-Lead MSOP (RM) 110 32.2 °C/W

1

θJA is specified for the nominal conditions, that is, θJA is specified for the

device soldered on a circuit board.

1

θJC Unit

JA

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.

Rev. PrA | Page 5 of 15