AD8610ARM-R2 datasheet(21/24 Pages) AD

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AD8610/AD8620

High Speed, Low Noise Differential Driver

The AD8620 is a perfect candidate as a low noise differential

driver for many popular ADCs. There are also other applica

tions (such as balanced lines) that require differential drivers.

The circuit of Figure 70 is a unique line driver widely used in

industrial applications. With ±13 V supplies, the line driver can

deliver a differential signal of 23 V p-p into a 1 kΩ load. The

high slew rate and wide bandwidth of the AD8620 combine to

yield a full power bandwidth of 145 kHz while the low noise

front end produces a referred-to-input noise voltage spectral

density of 6 nV/√Hz. The design is a balanced transmission system

without transformers, where output common-mode rejection of

noise is of paramount importance. Like the transformer-based

design, either output can be shorted to ground for unbalanced

line driver applications without changing the circuit gain of 1.

This allows the design to be easily set to noninverting, invert

ing, or differential operation.

VO1

VO2

V–

V+

1/2 AD8620

AD8610

1/2 AD8620

1kΩ

R13

1kΩ

10kΩ

1kΩ

R12

1kΩ

R10

50Ω

R11

50Ω

1kΩ

VO2 – VO1 = VIN

V–

V+

Figure 70. Differential Driver

Rev. E | Page 21 of 24

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