ADS5102

ADS5103

SLAS351B – OCTOBER 2001 – REVISED DECEMBER 2001

20

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PRINCIPLES OF OPERATION

3 k

Ω

3 k

Ω

3 k

Ω

3 k

Ω

REFT

AIN–

AIN+

REFB

AIN+

AIN–

ADS5102

ADS5103

Figure 33. Driving the Analog Inputs

setting the bias resistor—RBIAS

Each device in this family requires an external resistor be connected from pin 14 to ground. The value of this

resistor is determined by which device is being used. Refer to Table 2 for the correct resistor value. This resistor

only dissipates less than 1 mW of power. The resistor accuracy of 1% is adequate.

Table 2. Resistor Value

DEVICE

RBIAS VALUE

CONNECT FROM

ADS5103

8.25 k

Ω

Pin 14 to AGND

ADS5102

4.42 k

Ω

Pin 14 to AGND