Unity Gain Stable, Ultralow Distortion,

1 nV/

√Hz Voltage Noise, High Speed Op Amp

ADA4899-1

Rev. A

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FEATURES

Unity gain stable

Ultralow noise: 1 nV/√Hz, 2.6 pA/√Hz

Ultralow distortion −117 dBc at 1 MHz

High speed

−3 dB bandwidth: 600 MHz (G = +1)

Slew rate: 310 V/μs

Offset voltage: 230 μV maximum

Low input bias current: 100 nA

Wide supply voltage range: 5 V to 12 V

Supply current: 14.7 mA

High performance pinout

Disable mode

APPLICATIONS

A-to-D drivers

Instrumentation

Filters

IF and baseband amplifiers

DAC buffers

Optical electronics

CONNECTION DIAGRAMS

1

DISABLE

ADA4899-1

2

FEEDBACK

NC = NO CONNECT

3

–IN

8

7

NC

6

5

Figure 1. 8-Lead LFCSP_VD (CP-8-2)

1

FEEDBACK

ADA4899-1

2

–IN

3

+IN

DISABLE

8

7

6

5

Figure 2. 8-Lead SOIC_N_EP (RD-8-1)

GENERAL DESCRIPTION

The ADA4899-1 is an ultralow noise (1 nV/√Hz) and distortion

(<−117 dBc @1 MHz) unity gain stable voltage feedback op

amp, the combination of which makes it ideal for 16-bit and

18-bit systems. The ADA4899-1 features a linear, low noise

input stage and internal compensation that achieves high slew

rates and low noise even at unity gain. ADI’s proprietary next

generation XFCB process and innovative circuit design enable

such high performance amplifiers.

The ADA4899-1 drives 100 Ω loads at breakthrough performance

levels with only 15 mA of supply current. With the wide supply

voltage range (4.5 V to 12 V), low offset voltage (230 μV

maximum), wide bandwidth (600 MHz), and slew rate

(310 V/μs), the ADA4899-1 is designed to work in the most

demanding applications. The ADA4899-1 also features an input

bias current cancellation mode, which reduces input bias

current by a factor of 60.

The ADA4899-1 is available in a 3 mm × 3 mm LFCSP and a

8-lead SOIC package. Both packages feature an exposed metal

paddle that improves heat transfer to the ground plane. This is a

significant improvement over traditional plastic packages. The

ADA4899-1 is rated to work over the extended industrial

temperature range, −40°C to +125°C.

100

10

1

0.1

–130

–120

–110

–100

–90

–80

–70

–60

–50

–40

G = +1

FREQUENCY (MHz)

HD3

HD2

Figure 3. Harmonic Distortion vs. Frequency