ADS7253IPWR datasheet(31/71 Pages) TI1

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2 K VREF_x

0 V

AINP_x

AINM_x

VREF_x

Device

REFIO_x

VREF_x

0 V

AINP_x

AINM_x

VREF_x

Device

REFIO_x

ADS8353, ADS7853, ADS7253

www.ti.com

SBAS584B – OCTOBER 2013 – REVISED AUGUST 2014

Feature Description (continued)

8.3.2.2 Analog Input: Single-Ended and Pseudo-Differential Configurations

The ADS8353, ADS7853, and ADS7253 can support single-ended or pseudo-differential input configurations.

For supporting single-ended inputs, B7 in the configuration register (CFR.B7) must be set to 0 (CFR.B7 = 0) and

AINM_A and AINM_B must be externally connected to GND.

For supporting pseudo-differential inputs, CFR.B7 must be set to 1 (CFR.B7 = 1) and AINM_A and AINM_B must

be externally connected to FSR_ADC_A / 2 and FSR_ADC_B / 2, respectively. Note that CFR.B7 is common to

both ADCs.

The CFR.B9 and CFR.B7 settings can be combined to select the desired input configuration, as shown in

Table 1.

Table 1. Input Configurations

INPUT RANGE SELECTION

AINM SELECTION

CONNECTION DIAGRAM

CFR.B9 = 0

CFR.B7 = 0

(FSR_ADC_A = 0 to VREF_A)

(AINM_A = GND)

(FSR_ADC_B = 0 to VREF_B)

(AINM_B = GND)

CFR.B9 = 1

CFR.B7 = 0

(FSR_ADC_A = 0 to 2 x VREF_A)

(AINM_A = GND)

(FSR_ADC_B = 0 to 2 x VREF_B)

(AINM_B = GND)

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Product Folder Links: ADS8353 ADS7853 ADS7253

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