Analog Devices AD8608ARU, AD8608AR, AD8606ARM, AD8606AR, AD8605ART Datasheet

PRELIMINARY TECHNICAL DATA

Precision Low noise CMOS

a

Rail-to-Rail Input/Output

Operational Amplifiers

Preliminary Technical Data AD8605/AD8606/AD8608

FEATURES
Low Offset Voltage: 300 µµV max
Low Input Bias Currents
Low Noise: 6.5 nV/√√Hz
Low Supply Current: 1 mA/Amp
Wide Bandwidth: 10 MHz
Slew Rate: 5 V/µµs
Low Distortion
No Phase Reversal
High gain
Unity Gain Stable
Single-Supply Operation: 2.7 to 6 Volts

APPLICATIONS
Barcode Scanners
Battery Powered Instrumentation
Multi-pole Filters
Sensors
ASIC Input or Output Amplifier
Audio
Photodiode amplification

GENERAL DESCRIPTION

The AD8605, AD8606 and AD8608 are single, dual
and quad rail-to-rail input and output single supply
amplifiers featuring very low offset voltage, low input
voltage and current noise and wide signal bandwidth.
These amplifiers use a patented trimming technique that
achieves superior precision without laser trimming. All
are fully specified to operate from +3V to +5V single
supply.

The combination of low offsets, low noise, very low
input bias currents, and high speed make these
amplifiers useful in a wide variety of applications.
Filters, integrators, photo-diode amplifiers and high

impedance sensors all benefit from the combination of
performance features. Audio and other AC
applications benefit from the wide bandwidth and low
distortion.
Applications for these amplifiers include portable and
loop-powered instrumentation, audio
amplification for portable devices, portable phone
headsets, bar code scanners, and multi-pole filters.

The ability to swing rail-to-rail at both the input and
output enables designers to buffer CMOS ADCs,
DACs, ASICs and other wide output swing devices
in single supply systems.

The AD8605, AD8606 and AD8608 are specified
over the extended industrial (-40° to +125°C)
temperature range. The AD8605, single, is available
in the tiny 5-lead SOT-23 package. The AD8606,
dual, is available in the 8-lead micro-SOIC and
narrow SOIC surface mount packages. The
AD8608, quad, is available in 14-lead TSSOP and
narrow 14-pin SOIC packages.

SOT, MSOP and TSSOP versions are available in
tape and reel only.

REV. Pr0 8/29/2001

Inf ormation 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.

One Technology Way, PO Box 9106, Norwood, MA 02062-9106,

USA
Tel: [phone]
Fax: [phone]

—1—

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

© Analog Devices, Inc., 1997

PRELIMINARY TECHNICAL DATA

/2001

AD8605/8606/8608

ELECTRICAL CHARACTERISTICS (V

Parameter

INPUT CHARACTERISTICS
Offset Voltage VOS VCM = 0V to 3V 80 300 µV

-40°< TA < +125°C 750 µV

Input Bias Current IB 0.2 60 pA

-40°< TA < +85°C 100 pA

-40°< TA < +125°C 100 pA

Input Offset Current IOS 0.1 30 pA

-40°< TA < +85°C 50 pA

-40°< TA < +125°C 500 pA
Input Voltage Range 0 3 V

Common-Mode Rejection Ratio CMRR VCM = 0V to 2.7V 80 95 dB
Large Signal Voltage Gain AVO RL = 2 kΩ VO= 0.5V to 2.5V 200 350 V/mV
Offset Voltage Drift ∆VOS/∆T 1 µV/°C

OUTPUT CHARACTERISTICS
Output Voltage High VOH IL = 1mA 2.65 2.67 V

-40°C < TA < +125°C 2.6 V

Output Voltage Low VOL IL = 1mA 20 30 mV

-40°C < TA < +125°C 50 mV
Output Current I
Closed Loop Output Impedance Z

POWER SUPPLY
Power Supply Rejection Ratio PSRR VS = 2.7 V to 5.5 V 80 95 dB

Supply Current/Amplifier ISY VO = 0V 1150 1300 µA

-40°< TA < +125°C 1500 µA
DYNAMIC PERFORMANCE

Slew Rate SR RL =2 kΩ 5 V/µs
Settling Time ts To 0.01% <0.5 µs
Gain Bandwidth Product GBP 9 MHz

Phase Margin Øo 50 degrees
NOISE PERFORMANCE

Voltage Noise Density e
Voltage Noise Density e
Current Noise Density i

Symbol Conditions Min Typ Max Units

±30 mA

OUT

f=1 MHz, AV = 1 12 Ω

OUT

n f=1kHz 8
n f=10kHz 6.5

n f=1kHz 0.05

=+2.7V, VCM = VS/2, TA=+25°C unless otherwise noted)

S

nV/√Hz
nV/√Hz
pA/√Hz

—2— REV. Pr0 8/29