AD708 datasheet(10/16 Pages) AD

10 / 16 page

AD708

Rev. C | Page 10 of 16

THEORY OF OPERATION

CROSSTALK PERFORMANCE

The AD708 exhibits very low crosstalk as shown in Figure 25,

Figure 26, and Figure 27. Figure 25 shows the offset voltage

induced on Side B of the AD708 when Side A output is moving

slowly (0.2 Hz) from −10 V to +10 V under no load. This is the

least stressful situation to the part because the overall power in

the chip does not change. Only the location of the power in the

output device changes. Figure 26 shows the input offset voltage

change to Side B when Side A is driving a 2 kΩ load. Here the

power changes in the chip with the maximum power change

occurring at 7.5 V. Figure 27 shows crosstalk under the most

severe conditions. Side A is connected as a follower with

0 V input, and is forced to sink and source ±5 mA of output

current.

Power = (30 V)(5 mA) = 150 mW

Even this large change in power causes only an 8 μV (linear)

change in the input offset voltage of Side B.

VOUTA = 2V/DIV

AVOUTA

VIN = ±10V

BVOUTB

10kΩ

10Ω

Figure 25. Crosstalk with No Load

VOUTA = 2V/DIV

AVOUTA

VIN = ±10V

BVOUTB

10kΩ

2kΩ

10Ω

Figure 26. Crosstalk with 2 kΩ Load

INA = 1mA/DIV

VIN = ±10V

IIN = ±5mA

BVOUTB

10kΩ

2kΩ

10Ω

Figure 27. Crosstalk Under Forced Source and Sink Conditions

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