AD8610BR-REEL Просмотр технического описания (PDF) - Analog Devices

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AD8610BR-REEL

Precision, Very Low Noise, Low Input Bias Current, Wide Bandwidth JFET Operational Amplifier

Analog Devices 

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.

AD8610/AD8620

V+

R4

3

1kΩ

6

2 AD8610

V–

R3

1kΩ

V+

3

R8 2

1kΩ

1

VO1

1/2 AD8620

R10

50Ω

V– U2

R13

1kΩ

R5

1kΩ

R1

0

1kΩ

R9

V+

1kΩ 5

R12

1kΩ

R11

R6

10kΩ

R7

1kΩ

7

50Ω

VO2

6

1/2 AD8620

U3

V–

VO2 – VO1 = VIN

R2

1kΩ

0

Figure 70. Differential Driver

Rev. E | Page 21 of 24

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