1 nV/√Hz, Low Power,

Rail-to-Rail Output Amplifiers

ADA4896-2/ADA4897-1

Rev. 0

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FEATURES

Low wideband noise

1 nV/√Hz

2.8 pA/√Hz

Low 1/f noise

2.4 nV/√Hz @ 10 Hz

Low power: 3 mA/amp

Low input offset voltage: 0.5 mV maximum

High speed

230 MHz, −3 dB bandwidth (G = +1)

120 V/μs slew rate

45 ns settling time to 0.1%

Rail-to-rail output

Wide supply range: 3 V to 10 V

Disable feature (ADA4897-1)

APPLICATIONS

Low noise preamplifier

Ultrasound amplifiers

PLL loop filters

High performance ADC drivers

DAC buffers

GENERAL DESCRIPTION

The ADA4896-2/ADA4897-1 are unity gain stable, low noise,

rail-to-rail output, high speed voltage feedback amplifiers

that have a quiescent current of 3 mA. With the 1/f noise of

2.4 nV/√Hz at 10 Hz and a spurious-free dynamic range of

−80 dBc at 2 MHz, the ADA4896-2/ADA4897-1 are an ideal

solution in a variety of applications, including ultrasound, low

noise preamplifiers, and drivers of high performance ADCs.

The Analog Devices, Inc., proprietary next generation SiGe

bipolar process and innovative architecture enable such high

performance amplifiers.

TheADA4896-2/ADA4897-1 have 230 MHz bandwidth,

120 V/μs slew rate, and settle to 0.1% in 45 ns. With a wide

supply voltage range (3 V to 10 V), the ADA4896-2/ADA4897-1

are ideal candidates for systems that require high dynamic

range, precision, and high speed.

The ADA4896-2 is available in 8-lead LFCSP and 8-lead MSOP

packages. The ADA4897-1 is available in 8-lead SOIC and

6-lead SOT-23 packages. Both the ADA4896-2 and ADA4897-1

work over the extended industrial temperature range of −40°C

to +125°C.

FUNCTIONAL BLOCK DIAGRAM

8

7

OUT

6

NC

5

DISABLE

Figure 1. 8-Lead SOIC (ADA4897-1)

0

1

2

3

4

5

6

7

8

FREQUENCY (Hz)

1

10

100

1k

10k

100k

1M

5M

Figure 2. Voltage Noise vs. Frequency

Table 1. Other Low Noise Amplifiers

Part Number

@ 1 kHz

@ 100 kHz

BW (MHz)

Supply

Voltage (V)

AD797

0.9

0.9

8

10 to 30

AD8021

5

2.1

490

5 to 24

AD8099

7

0.95

510

5 to 12

AD8045

6

3

1000

3.3 to 12

ADA4899-1

1.4

1

600

5 to 12

ADA4898-1/

ADA4898-2

0.9

0.9

65

10 to 32

Table 2. Complementary ADCs

Part Number

Bits

Speed (MSPS)

Power (mW)

AD7944

14

2.5

15.5

AD7985

16

2.5

15.5

AD7986

18

2

15