ADS7253IPW datasheet(33/71 Pages) TI1

33 / 71 page

ADS8353, ADS7853, ADS7253

www.ti.com

SBAS584B – OCTOBER 2013 – REVISED AUGUST 2014

8.3.3 Transfer Function

The device supports two input configurations:

1. Single-ended inputs, CFR.B7 = 0 (default), or

2. Pseudo-differential inputs, CFR.B7 = 1.

The device also supports two output data formats:

1. Straight binary output, CFR.B4 = 0 (default), or

2. Twos compliment output, CFR.B4 = 1.

Device resolution is calculated by Equation 5:

1 LSB = (FSR_ADC_x) / (2

where:

•

N = 16 (ADS8353), 14 (ADS7853), or 12 (ADS7253) and

•

FSR_ADC_x is the full-scale input range of the ADC (refer to the Analog Input section for more details)

(5)

Table 2 and Table 3 show the different input voltages and the corresponding output codes from the device.

Table 2. Transfer Characteristics for Straight Binary Output (CFR.B4 = 0, Default)

OUTPUT CODE (Hex)

INPUT VOLTAGE

INPUT

STRAIGHT BINARY (CFR.B4 = 0, Default)

CONFIGURATION

AINP_x

AINM_x

AINP_x - AINM_x

CODE

ADS8353

ADS7853

ADS7253

≤ 1 LSB

0000

000

Single-ended

(CFR.B7 = 0,

FSR_ADC_x / 2

7FFF

1FFF

7FF

default)

≥ FSR_ADC_x – 1 LSB

FSC

FFFF

3FFF

FFF

≤ 1 LSB

≤ –FSR_ADC_x / 2 + 1 LSB

0000

000

Pseudo-differential

FSR_ADC_x / 2

7FFF

1FFF

7FF

(CFR.B7 = 1)

≥ FSR_ADC_x – 1 LSB

≥ FSR_ADC_x / 2 – 1 LSB

FSC

FFFF

3FFF

FFF

Table 3. Transfer Characteristics for Twos Compliment Output (CFR.B4 = 1)

OUTPUT CODE (Hex)

INPUT VOLTAGE

INPUT

TWOS COMPLIMENT (CFR.B4 = 1)

CONFIGURATION

AINP_x

AINM_x

AINP_x - AINM_x

CODE

ADS8353

ADS7853

ADS7253

≤ 1 LSB

NFSC

8000

2000

800

Single-ended

(CFR.B7 = 0,

FSR_ADC_x / 2

0000

000

default)

≥ FSR_ADC_x – 1 LSB

PFSC

7FFF

1FFF

7FF

≤ 1 LSB

≤ –FSR_ADC_x / 2 + 1 LSB

NFSC

8000

2000

800

Pseudo-differential

FSR_ADC_x / 2

0000

000

(CFR.B7 = 1)

≥ FSR_ADC_x – 1 LSB

≥ FSR_ADC_x / 2 – 1 LSB

PFSC

7FFF

1FFF

7FF

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