ADS1015-Q1

SBAS511 – JULY 2010

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Table 2. Differential Input Impedance

FS (V)

DIFFERENTIAL INPUT IMPEDANCE

22M

Ω

15M

Ω

±2.048V

4.9M

Ω

±1.024V

2.4M

Ω

±0.512V

710k

Ω

±0.256V

710k

Ω

(1)

This parameter expresses the full-scale range of the ADC scaling. In

no event should more than VDD + 0.3V be applied to this device.

The typical value of the input impedance cannot be neglected. Unless the input source has a low impedance, the

ADS1015 input impedance may affect the measurement accuracy. For sources with high output impedance,

buffering may be necessary. Active buffers introduce noise, and also introduce offset and gain errors. All of these

factors should be considered in high-accuracy applications.

Because the clock oscillator frequency drifts slightly with temperature, the input impedances also drift. For many

applications, this input impedance drift can be ignored, and the values given in Table 2 for typical input

impedance are valid.

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