0.4 µV/°C Offset Drift, 105 MHz Low Power,

Low Noise, Rail-to-Rail Amplifier

Enhanced Product

ADA4805-2-EP

Rev. 0

Document Feedback

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother

rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

©2016 Analog Devices, Inc. All rights reserved.

Technical Support

www.analog.com

FEATURES

Low input offset voltage: 125 µV (maximum)

Low input offset voltage drift

0.4 µV/°C (typical)

2.7 µV/°C (maximum)

Ultralow supply current: 500 µA per amplifier

High speed performance

−3 dB bandwidth: 105 MHz

Slew rate: 160 V/µs

Settling time to 0.1%: 35 ns

Rail-to-rail outputs

Low noise: 5.9 nV/√Hz at 100 kHz; 0.6 pA/√Hz at 100 kHz

Low distortion: −102 dBc/−126 dBc HD2/HD3 at 100 kHz

Low input bias current: 470 nA (typical)

Small packaging

8-lead MSOP

ENHANCED PRODUCT FEATURES

Supports defense and aerospace applications (AQEC standard)

Extended industrial temperature range (−55°C to +125°C)

Controlled manufacturing baseline

1 assembly/test site

1 fabrication site

Enhanced product change notification

Qualification data available upon request

APPLICATIONS

High resolution, high precision analog-to-digital converter

(ADC) drivers

Battery-powered instrumentation

Micropower active filters

Portable point of sales terminals

Active radio frequency identification (RFID) readers

Photomultipliers

ADC reference buffers

GENERAL DESCRIPTION

The ADA4805-2-EP is a high speed voltage feedback, rail-to-rail

output amplifier with an exceptionally low quiescent current of

500 µA, making it ideal for low power, high resolution data

conversion systems. Despite being low power, this amplifier

provides excellent overall performance. It offers a high bandwidth

of 105 MHz at a gain of +1, a high slew rate of 160 V/µs, and a

low input offset voltage of 125 µV (maximum).

TYPICAL APPLICATIONS CIRCUIT

AD7980

C2

10µF

IN+

IN–

GND

VDD

REF

C3

0.1µF

C4

100nF

VDD

C1

2.7nF

R3

20Ω

+7.5V

+7.5V

ADA4805-2-EP

ADA4805-2-EP

ADR435

5V REF

0V TO

Figure 1. Driving the AD7980 with the ADA4805-2-EP

The Analog Devices, Inc., proprietary extra fast complementary

bipolar (XFCB) process allows both low voltage and low current

noise (5.9 nV/√Hz, 0.6 pA/√Hz). The ADA4805-2-EP operates

over a wide range of supply voltages from ±1.5 V to ±5 V, as well as

single 3 V and 5 V supplies, making it ideal for high speed, low

power instruments.

The ADA4805-2-EP is available in an 8-lead MSOP package and is

rated to work over the extended industrial temperature range of

−55°C to +125°C. Additional application and technical infor-

mation can be found in the ADA4805-1/ADA4805-2 data sheet.

0

80

20

40

60

70

50

30

10

FREQUENCY (kHz)

–20

0

–40

–60

–80

–100

–120

–140

–160

–180

INPUT FREQUENCY = 10kHz

SNR = 89.4dB

THD = 104dB

SINAD = 89.3dB

Figure 2. FFT Plot for the Circuit Configuration in Figure 1

Product

ADC Power (mW)

Throughput

(MSPS)

Resolution

(Bits)

SNR

(dB)

AD7982

7.0

1

18

98

AD7984

10.5

1.33

18

98.5

AD7980

4.0

1

16

91

AD7685

10

0.25

16

88