High Performance Video Op Amp

Data Sheet

AD811

FEATURES

High speed

140 MHz bandwidth (3 dB, G = +1)

120 MHz bandwidth (3 dB, G = +2)

35 MHz bandwidth (0.1 dB, G = +2)

2500 V/µs slew rate

25 ns settling time to 0.1% (for a 2 V step)

65 ns settling time to 0.01% (for a 10 V step)

Excellent video performance (RL =150 Ω)

0.01% differential gain, 0.01° differential phase

Voltage noise of 1.9 nV/√Hz

Low distortion: THD = −74 dB at 10 MHz

Excellent dc precision: 3 mV max input offset voltage

Flexible operation

Specified for ±5 V and ±15 V operation

±2.3 V output swing into a 75 Ω load (VS = ±5 V)

APPLICATIONS

Video crosspoint switchers, multimedia broadcast systems

HDTV compatible systems

Video line drivers, distribution amplifiers

ADC/DAC buffers

DC restoration circuits

Medical

Ultrasound

PET

Gamma

Counter applications

MIL-STD-883B parts available

CONNECTION DIAGRAMS

Figure 1. 8-Lead Plastic (N-8), CERDIP (Q-8), SOIC_N (R-8)

Figure 2. 16-Lead SOIC_W (RW-16)

Figure 3. 20-Terminal LCC (E-20-1)

GENERAL DESCRIPTION

A wideband current feedback operational amplifier, the AD811

is optimized for broadcast-quality video systems. The −3 dB

bandwidth of 120 MHz at a gain of +2 and the differential gain

and phase of 0.01% and 0.01° (RL = 150 Ω) make the AD811 an

excellent choice for all video systems. The AD811 is designed to

meet a stringent 0.1 dB gain flatness specification to a bandwidth of

35 MHz (G = +2) in addition to low differential gain and phase

errors. This performance is achieved whether driving one or two

back-terminated 75 Ω cables, with a low power supply current

of 16.5 mA. Furthermore, the AD811 is specified over a power

supply range of ±4.5 V to ±18 V.

The AD811 is also excellent for pulsed applications where

transient response is critical. It can achieve a maximum slew

rate of greater than 2500 V/µs with a settling time of less than

25 ns to 0.1% on a 2 V step and 65 ns to 0.01% on a 10 V step.

The AD811 is ideal as an ADC or DAC buffer in data acquisition

systems due to its low distortion up to 10 MHz and its wide unity

gain bandwidth. Because the AD811 is a current feedback ampli-

fier, this bandwidth can be maintained over a wide range of

gains. The AD811 also offers low voltage and current noise of

1.9 nV/√Hz and 20 pA/√Hz, respectively, and excellent dc

accuracy for wide dynamic range applications.

1

2

3

4

8

7

6

5

AD811

NC

–IN

+IN

–VS

+VS

NC

OUTPUT

NC

NC = NO CONNECT

NC

1

NC

2

–IN

3

NC

4

NC

16

NC

15

+VS

14

NC

13

+IN

5

OUTPUT

12

NC

6

NC

11

–VS 7

NC

10

NC

8

NC

9

NOTES

1. NC = NO CONNECT. DO NOT CONNECT TO THIS PIN.

AD811

TOP VIEW

(Not to Scale)

4

NC

5

NC

6

–IN

7

NC

8

+IN

18

NC

17

NC

16

+VS

15

NC

14

OUTPUT

19

20

1

2

3

13

12

11

10

9

TOP VIEW

(Not to Scale)

AD811

NOTES

1. NC = NO CONNECT. DO NOT CONNECT TO THIS PIN.

Rev. G

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