Low Power, 1 nV/√Hz, G ≥ 10 Stable, Rail-

to-Rail Output Amplifier

Data Sheet

ADA4895-1/ADA4895-2

FEATURES

Low wideband noise

1 nV/√Hz

1.6 pA/√Hz

Low 1/f noise: 2 nV/√Hz at 10 Hz

Low power: 3 mA per amplifier

Low input offset voltage: 350 µV maximum

High speed

236 MHz, −3 dB bandwidth (G = +10)

943 V/µs slew rate

22 ns settling time to 0.1%

Rail-to-rail output

Wide supply range: 3 V to 10 V

Disable feature

APPLICATIONS

Low noise preamplifier

Ultrasound amplifiers

PLL loop filters

High performance analog-to-digital converter (ADC) drivers

Digital-to-analog converter (DAC) buffers

GENERAL DESCRIPTION

The ADA4895-1 (single) and ADA4895-2 (dual) are high speed

voltage feedback amplifiers that are gain ≥ 10 stable with low

input noise, rail-to-rail output, and a quiescent current of 3 mA per

amplifier. With a 1/f noise of 2 nV/√Hz at 10 Hz and a spurious-

free dynamic range (SFDR) of −72 dBc at 2 MHz, the ADA4895-1/

ADA4895-2 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

enables the high performance of these amplifiers.

The ADA4895-1/ADA4895-2 have a small signal bandwidth of

236 MHz at a gain of +10 with a slew rate of 943 V/µs, and settle

to 0.1% in 22 ns. The wide supply voltage range (3 V to 10 V)

of the ADA4895-1/ADA4895-2 make these amplifiers ideal

candidates for systems that require large dynamic range, high

gain, precision, and high speed.

The ADA4895-1 is available in 8-lead SOIC and 6-lead SOT-23

packages, and the ADA4895-2 is available in a 10-lead MSOP

package. All packages operate over the extended industrial

temperature range of −40°C to +125°C.

FUNCTIONAL BLOCK DIAGRAMS

NC

1

–IN

2

+IN

3

8

7

OUT

6

NC

5

ADA4895-1

DISABLE

NC = NO CONNECT. DO NOT

CONNECT TO THIS PIN.

Figure 1. ADA4895-1 Single Amplifier (8-Lead SOIC)

OUT1

1

–IN1

2

+IN1

3

DISABLE1

5

10

OUT2

9

–IN2

8

+IN2

7

DISABLE2

6

ADA4895-2

Figure 2. ADA4895-2 Dual Amplifier (10-Lead MSOP)

0

1

2

3

4

5

0

12

6

18

24

30

1

10

100

1k

10k

100k

1M

FREQUENCY (Hz)

VOLTAGE

CURRENT

Figure 3. Input Voltage and Current Noise vs. Frequency

Part Number(s)

(nV/√Hz)

Bandwidth

(MHz)

Supply

Voltage (V)

AD8021

2.1

490

5 to 24

AD8045

3

1000

3.3 to 12

AD8099

0.95

510

5 to 12

ADA4841-1/ADA4841-2 2.1

80

2.7 to 12

ADA4896-2

1

230

3 to 10

ADA4897-1/ADA4897-2 1

230

3 to 10

ADA4898-1/ADA4898-2 0.9

65

10 to 32

ADA4899-1

1

600

5 to 12

1

See www.analog.com for the latest selection of low noise amplifiers.

COMPANION PRODUCTS

ADCs: AD7944 (14-bit), AD7985 (16-bit), AD7986 (18-bit)

Additional companion products on the ADA4895-1/ADA4895-2

product page

Rev. B

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