ADS1113 datasheet(13/43 Pages) TI2

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ADS1018

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SBAS526D – NOVEMBER 2012 – REVISED SEPTEMBER 2019

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Feature Description (continued)

8.3.3 Full-Scale Range (FSR) and LSB Size

A programmable gain amplifier (PGA) is implemented in front of the ADS1018 ΔΣ ADC core. The full-scale range

is configured by bits PGA[2:0] in the Config register, and can be set to ±6.144 V, ±4.096 V, ±2.048 V, ±1.024 V,

±0.512 V, or ±0.256 V.

Table 1 shows the FSR together with the corresponding LSB size. Calculate the LSB size from the full-scale

voltage by the formula shown in Equation 2. However, make sure that the analog input voltage never exceeds

the analog input voltage range limit given in the Electrical Characteristics. If VDD greater than 4 V is used, the

±6.144-V full-scale range allows input voltages to extend up to the supply. Note though that in this case, or

whenever the supply voltage is less than the full-scale range (for example, VDD = 3.3 V and full-scale range =

±4.096 V), a full-scale ADC output code cannot be obtained. This inability means that some dynamic range is

lost.

LSB = FSR / 2

(2)

(1)

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

Do not apply more than VDD + 0.3 V to this device.

Table 1. Full-Scale Range and Corresponding LSB Size

FSR

LSB SIZE

±6.144 V(1)

3 mV

±4.096 V(1)

2 mV

±2.048 V

1 mV

±1.024 V

0.5 mV

±0.512 V

0.25 mV

±0.256 V

0.125 mV

8.3.4 Voltage Reference

The ADS1018 has an integrated voltage reference. An external reference cannot be used with this device. Errors

associated with the initial voltage reference accuracy and the reference drift with temperature are included in the

gain error and gain drift specifications in the Electrical Characteristics.

8.3.5 Oscillator

The ADS1018 has an integrated oscillator running at 1 MHz. No external clock is required to operate the device.

The internal oscillator drifts over temperature and time. The output data rate scales proportionally with the

oscillator frequency.

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