Analog Devices AD8553 prd Datasheet

1.8V Auto-Zero In-Amp w/ Shutdown

Rev. PrD

Preliminary Technical Data AD8553

FEATURES

Low Offset Voltage: 25 µV max
Low Input Offset Drift: 0.1 µV/°C max
High CMRR: 120 dB min @ G=100
Low Noise: 0.7 µV p-p from 0.01Hz-10Hz
Wide Gain Range: 1 to 10,000

Single Supply Operation: +1.8V to +5.5V
Rail-to-Rail Output
Shutdown capability

APPLICATIONS

Strain Gages
Weigh Scales
Pressure Sensors
Laser Diode Control Loops
Portable Medical Instruments
Thermocouple Amplifiers

GENERAL DESCRIPTION

The AD8553 is a precision instrumentation amplifier
featuring low noise, rail-to-rail output and a power-saving
shutdown mode. The AD8553 also features low offset and
drift coupled with high common mode rejection. In
shutdown mode, the total supply current is reduced to less
than 4 µA. Operation is fully specified from +1.8V to
+5.5V.

With low offset voltage of 25µV, offset voltage drift of

0.1µV/°C and voltage noise of only 0.7µV p-p (0.01Hz to
10 Hz), the AD8553 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 or minimum board size for
space-critical equipment and portable systems.

The AD8553 is specified over the industrial temperature
range from -40°C to +85°C. The AD8553 is available in
the lead-free 10-lead MSOP.

Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its use,
nor for any infringements of patents or other rights of third parties which may
result from its use. No license is granted by implication or otherwise under any
patent or patent rights of Analog Devices.

RGA

VINP

VO

VFB ENABLE

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone]
Fax: [phone]

World Wide Web Site: http://www.analog.com

10-Lead MSOP
(RMZ-10)

y

VCC

© Analog Devices, Inc., 2005

AD8553

RGB

VINN

GND

VREF

PPrreelliimmiinnaarryy TTeecchhnniiccaall DDaatta

a

AD8553

ELECTRICAL SPECIFICATIONS (V

specified, G=1000 (R

Parameter Symbol Conditions Min Typ Max Units

INPUT CHARACTERISTICS
Input Offset Voltage Vos G = 1000 25 µV
G = 100 25
G = 10 50 µV
G = 1 350 µV

vs. Temperature ∆Vos/∆T G = 1000, -40°C ≤ TA ≤ +85°C 0.01 0.1 µV/°C
G = 100, -40°C ≤ TA ≤ +85°C 0.01 0.1
G = 10, -40°C ≤ TA ≤ +85°C 0.1 0.3 µV/°C
G = 1, -40°C ≤ TA ≤ +85°C 0.7 3 µV/°C

Input Bias Current IB 0.3 1 nA

-40°C ≤ TA ≤ +85°C 2 nA
Input Bias Current @ V

Input Operating Impedance
Differential 75 || 2 MΩ || pF
Common-Mode 100 || 2 MΩ || pF

Input Voltage Range 0 3.35 V
Common-Mode Rejection Ratio CMRR G = 100, VCM = 0V to 3.35V 120 140 dB

-40°C ≤ TA ≤ +85°C 105 140 dB
G=10, VCM = 0V to 3.35V 100 120 dB

Gain Error G = 100, VCM = 12.125 mV, 0.25 %
V

G = 10, VCM = 121.25mV, 0.5 %
V

Gain tempco -40°C ≤ TA ≤ +85°C 50 ppm/°C

Non-Linearity G = 100, VCM = 12.125mV, 0.006 % FS
V

G=10, VCM = 121.25mV, 0.035 % FS
V

V

Range 0.8 4.2 V

REF

OUTPUT CHARACTERISTICS
Output Voltage High VOH 4.925 V

Output Voltage Low VOL 0.075 V
POWER SUPPLY

Power Supply Rejection Ratio PSRR G=100, Vs = 1.8V to 5.5V, VCM = 0V 100 120 dB
G=10, Vs = 1.8V to 5.5V, VCM = 0V 90 106 dB
Supply Current ISY I

-40°C ≤ TA ≤ +85°C 1.5 mA
Supply Current Shutdown Mode ISD
ENABLE (pin) INPUTS

= 4kΩ, R2 = 2MΩ), G=100 (R1 = 3.92kΩ, R2 = 196kΩ), G=10 (R1 = 20kΩ, R2 = 100kΩ), G=1 (R1 = 200kΩ,R2 = 100kΩ))

1

REF

= 0.075V to 4.925V

O

= 0.075V to 4.925V

O

= 0.075V to 4.925V

O

= 0.075V to 4.925V

O

= 0, VIN = 0V 1.1 1.3 mA

O

2 4

= 5V, VCM = 2.5V, VO =V

S

= VCC/2, RL = 10kΩ to GND, TA=25°C unless

REF

µV

µV/°C

0.02

1 nA

µA

Logic High Voltage VINH 2.4 V

Logic Low Voltage VINL 0.8 V
– 2 –

Rev. PrD

AD8553

PPrreelliimmiinnaarryy TTeecchhnniiccaall DDaatta

NOISE PERFORMANCE
Voltage Noise e

Voltage Noise Density e

Internal Clock Frequency
Signal Bandwidth
(*500 Hz for x-grade samples)

f = 0.01 Hz to 10 Hz 0.7 µV

n p-p
n G = 100, f = 1 kHz 35

G = 10, f = 1kHz 150
40
G = 1 to 1000 1*

a

p-p

nV/√Hz
nV/√Hz
kHz
kHz

– 3 –
Rev. PrD