AD830JRZ-R7 datasheet(15/20 Pages) AD

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Data Sheet

AD830

Rev. D | Page 15 of 20

VOUT

AD830

A = 1

VICM

VIN

VOCM

VOUT = (VIN – VICM) + VOCM

Figure 35. General Single-Supply Connection

DIFFERENTIAL INPUTVOLTAGE (VPEAK)

2.0

0.4

1.2

1.6

0.8

VP = +30V

VP = +15V

VP = +10V

TO GND

Figure 36. Input Common-Mode Range for Single Supply

SUPPLY VOLTAGE (V)

TO VP

TO GND

Figure 37. Output Swing Limit for Single Supply

Differential Line Receiver

The AD830 is specifically designed to perform as a differential

line receiver. The circuit in Figure 38 shows how simple it is to

configure the AD830 for this function. The signal from System A is

received differentially relative to the common of System A, and

that voltage is exactly reproduced relative to the common in

System B. The common-mode rejection versus frequency, shown

in Figure 6, is excellent, typically 100 dB at low frequencies.

The high input impedance permits the AD830 to operate as a

bridging amplifier across low impedance terminations with

negligible loading. The differential gain and phase specifications

are very good, as shown in Figure 12 for 500 Ω and Figure 15

for 150 Ω. The input and output common should be separated

to achieve the full CMR performance of the AD830 as a

differential amplifier. However, a common return path is

necessary between System A and System B.

COMMON IN

SYSTEM A

AD830

A = 1

VCM

ZCM

COMMON IN

SYSTEM B

VOUT

0.1µF

INPUT

SIGNAL

VOUT = V1 – V2

Figure 38. Differential Line Receiver

Wide Range Level Shifter

The wide common-mode range and accuracy of the AD830

allows easy level shifting of differential signals referred to an

input common-mode voltage to any new voltage defined at the

output. The inputs may be referenced to levels as high as 10 V at

the inputs with a ±2 V swing around 10 V. In the circuit in

Figure 39, the output voltage, VOUT, is defined by the simple

equation shown below. The excellent linearity and low distortion

are preserved over the full input and output common-mode

range. The voltage sources need not be of low impedance, since

the high input resistance and modest input bias current of the

AD830 V-to-I converters permit the use of resistive voltage

dividers as reference voltages.

VOUT

INPUT

COMMON

0.1µF

AD830

A = 1

0.1µF

INPUT

SIGNAL

OUTPUT

COMMON

VOUT = V1 – V2 + V3

Figure 39. Differential Amplification with Level Shifting

Difference Amplifier with Gain > 1

The AD830 can provide instrumentation amplifier style and

differential amplification at gains greater than 1. The input

signal is connected differentially and the gain is set via feedback

resistors, as shown in Figure 40. The gain is G = (R2 + R1)/R2.

The AD830 can provide either inverting or noninverting

differential amplification. The polarity of the gain is established

by the polarity of the connection at the input. Feedback resistor,

R2, should generally be R2 ≤ 1 kΩ to maintain closed-loop

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