Low Cost CMOS, High Speed,

Rail-to-Rail Amplifiers

ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4

Rev. B

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FEATURES

High speed and fast settling

−3 dB bandwidth: 220 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 at 1 MHz

Linear output current: 125 mA at −40 dBc

Low power: 4.4 mA per amplifier

APPLICATIONS

Imaging

Consumer video

Active filters

Coaxial cable drivers

Clock buffers

Photodiode preamp

Contact image sensor and buffers

GENERAL DESCRIPTION

The ADA4891-1 (single), ADA4891-2 (dual), ADA4891-3 (triple),

and ADA4891-4 (quad) 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 to within 50 mV of each rail, enabling maxi-

mum dynamic range.

The ADA4891 family of amplifiers is ideal for imaging applica-

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

sensor and buffers. Low distortion and fast settling time also

make them ideal for active filter applications.

The ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 are avail-

able 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

ADA4891-3 and ADA4891-4 are available in 14-lead SOIC and

14-lead TSSOP packages. The amplifiers are specified to operate

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

CONNECTION DIAGRAMS

NC

8

7

OUT

6

NC

5

ADA4891-1

NC = NO CONNECT

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

5

–IN

4

ADA4891-1

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

ADA4891-2

8

OUT2

7

–IN2

6

+IN2

5

NC = NO CONNECT

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

OUT2

14

–IN2

13

+IN2

12

11

+IN3

10

–IN3

9

OUT3

8

ADA4891-3

Figure 4. 14-Lead SOIC_N (R-14) and 14-Lead TSSOP (RU-14)

+IN2

OUT2

OUT4

+IN4

+IN3

OUT3

+IN1

2

3

4

5

6

7

14

13

12

11

10

9

8

–IN1

–IN2

–IN4

–IN3

ADA4891-4

Figure 5. 14-Lead SOIC_N (R-14) and 14-Lead TSSOP (RU-14)