COMBOSMARTMETER datasheet(17/60 Pages) TI1

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+1/2 V

REF

VREF

1/2

Single-Ended Inputs

INP

CM Voltage

Differential Inputs

INP

INN

CM Voltage

REF

Common-Mode Voltage (Differential Mode) =

(INP) + (INN)

, Common-Mode Voltage (Single-Ended Mode) =INN

INN = CM Voltage

CM + 1/2 VREF

1/2 VREF

CM + 1/2 VREF

Input Range (Differential Mode) = (AINP – AINN) = 2 VREF

a) Single-Ended Input

b) Differential Input

Device

Common

Voltage

1/2 V

REF

+1/2 V

REF

Device

Peak-to-Peak

REF

Peak-to-Peak

REF

Common

Voltage

ADS131E04

ADS131E06

ADS131E08

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SBAS561A – JUNE 2012 – REVISED APRIL 2013

ANALOG INPUT

The ADS131E0x analog input is fully differential. Assuming PGA = 1, the differential input (INP – INN) can span

between –VREF to +VREF. Refer to Table 5 for an explanation of the correlation between the analog input and

digital codes. There are two general methods of driving the ADS131E0x analog input: single-ended or

differential, as shown in Figure 19 and Figure 20, respectively. Note that INP and INN are 180°C out-of-phase in

the differential input method. When the input is single-ended, the INN input is held at the common-mode voltage,

preferably at mid-supply. The INP input swings around the same common voltage and the peak-to-peak

amplitude is (common-mode + 1/2 VREF) and (common-mode – 1/2 VREF). When the input is differential, the

common-mode is given by [(INP + INN) / 2]. Both INP and INN inputs swing from (common-mode + 1/2 VREF to

common-mode – 1/2 VREF). For optimal performance, it is recommended that the ADS131E0x be used in a

differential configuration.

Figure 19. Methods of Driving the ADS131E0x: Single-Ended or Differential

Figure 20. Using the ADS131E0x in Single-Ended and Differential Input Modes

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