AD8253 datasheet(31/34 Pages) AD

Part #	AD8253

Description	36V Fully-Differential Programmable-Gain Instrumentation Amplifier with 25pA Input Bias Current

PDF	34 Pages

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Manufacturer	AD [Analog Devices]

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31 / 34 page

LTC6373

Rev. 0

For more information www.analog.com

As another data acquisition system example, the circuit

of Figure 20 shows the LTC6373 driving the AD7768-1

(a 24-bit, 256ksps, ∑-∆ ADC) through the ADA4945-1 (a

high speed, fully differential ADC driver). The ADC driver

in this circuit has been configured with a closed-loop gain

of 1.3V/V (by using matched discrete resistors) and once

again the LTC6373 in conjunction with the ADA4945-1

provide the maximum 2VREF peak-to-peak differential sig-

nal range needed at the AD7768-1 inputs. More details

about this circuit can be found in Table 7 and the typical

SNR and THD achieved by this signal chain are illustrated

in Figure 21 and Figure 22.

Table 7. Details for LTC6373 Driving AD7768-1 Through ADA4945-1

ADC

VREF

(V)

Signal Level at LTC6373

Outputs = ADC Driver Inputs

(VP-P)

Signal Level at ADC

Driver Outputs = ADC

Inputs (VP-P)

Typical SNR

(dB)

Typical THD

(dB)

AD7768-1 4.096 6.3

8.192

See Figure 21

See Figure 22

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AD8253 Datasheet(PDF) 31 Page - Analog Devices