Low Cost CMOS, High Speed,

Rail-to-Rail Amplifiers

ADA4891-1/ADA4891-2

Rev. A

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FEATURES

Low cost

High speed and fast settling

−3 dB bandwidth: 240 MHz (G = +1)

Slew rate: 170 V/μs

Settling time to 0.1%: 28 ns

0.1 dB gain flatness: 25 MHz

Differential gain error: 0.05%

Differential phase error: 0.25°

Single-supply operation

Wide supply range: 2.7 V to 5.5 V

Output swings to within 50 mV of supply rails

Low distortion: 79 dBc SFDR @ 1 MHz

Linear output current: 150 mA @ −50 dBc

Low power of 4.4 mA per amplifier

APPLICATIONS

Imaging

Consumer video

Active filters

Coaxial cable drivers

Clock buffers

Photodiode preamp

Contact image sensor and buffers

CONNECTION DIAGRAMS

A

NC

1

–IN

2

+IN

3

NC

8

7

6

NC

5

DA4891-1

NC = NO CONNECT

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

+IN

3

5

ADA4891-1

–IN

4

Figure 2. 5-Lead SOT-23 (RJ-5)

ADA4891-2

OUT1

1

–IN1

2

+IN1

3

8

OUT

7

–IN2

6

+IN2

5

NC = NO CONNECT

Figure 3. 8-Lead SOIC (R-8) and 8-Lead MSOP (RM-8)

GENERAL DESCRIPTION

The ADA4891-1 (single) and ADA4891-2 (dual) are CMOS, high

speed amplifiers that offer high performance at a low cost. The

amplifiers feature true single-supply capability, with an input

voltage range that extends 300 mV below the negative rail.

In spite of their low cost, the ADA4891 family provides high

performance and versatility. The rail-to-rail output stage enables

the output to swing within 50 mV of each rail, enabling maximum

dynamic range.

The ADA4891 family of amplifiers are ideal for imaging applications,

such as consumer video, CCD buffers, and contact image sensor

buffers. Low distortion and fast settling time also make them

ideal for active filter applications.

The ADA4891-1/ADA4891-2 are available in a wide variety of

packages. The ADA4891-1 is available in 8-lead SOIC and

5-lead SOT-23 packages. The ADA4891-2 is available in 8-lead

SOIC and 8-lead MSOP packages. The amplifiers are specified to

operate over the extended temperature range of −40°C to +125°C.

–10

–9

–8

–7

–6

–5

–4

–3

–2

–1

0

1

0.1

1k

1

10

100

FREQUENCY (MHz)

G = +1

G = +2

G = +5