AD830JRZ-R7 datasheet(17/20 Pages) AD

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AD830

Rev. C | Page 17 of 20

Ω

VOUT

AD830

A = 1

0.1µF

VIN

Figure 44. Full Bandwidth Line Driver (G = +2)

SUPPLY VOLTAGE (±V)

0.05

0.01

0.04

0.06

0.07

0.09

GAIN

PHASE

GAIN = +2

RL = 150Ω

FREQ = 3.58MHz

0 TO 0.7V

0.02

0.03

0.10

0.08

0.16

0.04

0.06

0.14

0.18

0.02

0.12

0.10

0.08

0.20

FREQUENCY (Hz)

0.2

10k

–0.8

100k

10M

100M

–0.7

–0.6

–0.5

–0.4

–0.3

–0.2

–0.1

0.1

VS = ±15V

RL = 150Ω

GAIN = +2

VS = ±10V

VS = ±5V

Figure 46. 0.1 dB Gain Flatness for the Circuit of Figure 44

AC-COUPLED LINE RECEIVER

The AD830 is configurable as an ac-coupled differential

amplifier on a single- or bipolar-supply voltage. All that is

needed is inclusion of a few noncritical passive components, as

illustrated in Figure 47. A simple resistive network at the X GM

input establishes a common-mode bias. Here, the common

mode is centered at 6 V, but in principle can be any voltage

within the common-mode limits of the AD830. The 10 kΩ

resistors to each input bias the X GM stage with sufficiently high

impedance to keep the input coupling corner frequency low, but

not too large so that residual bias current induced offset voltage

becomes troublesome. For dual-supply operation, the 10 kΩ

resistors may go directly to ground. The output common is

conveniently set by a Zener diode for a low impedance

reference to preserve the high frequency CMR. However, a

simple resistive divider works fine, and good high frequency

CMR can be maintained by placing a compensating resistor in

series with the +Y input. The excellent CMRR response of the

circuit is shown in Figure 48. A plot of the 0.1 dB flatness from

10 Hz is also shown. With the use of 10 μF capacitors, the CMR

is >90 dB down to a few tens of hertz. This level of performance

is almost impossible to achieve with discrete solutions.

Figure 45. Differential Gain and Phase for the Circuit of Figure 44

Ω

+12V

VOUT

1000µF

10µF

AD830

A = 1

0.1µF

ZCM

Ω

COAX

CABLE

+12V

4.7k

Ω

6.8V

1N4736

INPUT

SIGNAL

10k

Ω

10k

Ω

Ω*

+VS

10k

Ω

10k

Ω

*OPTIONAL TUNING FOR IMPROVING

VERY LOW FREQUENCY CMR.

Figure 47. AC-Coupled Line Receiver

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