ZSC31150GAG2-R datasheet(14/26 Pages) IDT

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ZSC31150 Datasheet

December 6, 2016

The result of the AD conversion is a relative counter result corresponding to the following equation (see the ZSC31150 Functional Description

for more detailed equations):

















ADC

ADC_REF

ADC_DIFF

ADC

ZADC

Number of counts (result of the conversion)

rADC

Selected ADC resolution in bits

VADC_DIFF Differential input voltage of the ADC

VADC_REF Reference voltage of the ADC

RSADC Digital ADC range shift (RSADC = 1/16, 1/8, 1/4, 1/2, controlled by the

EEPROM setting)

The sensor input signal can be shifted to the optimal input range of the ADC with the RSADC value.

Table 2.3 Analog Output Resolution versus Sample Rate

ADC

Adjustment

Approximated Output

Resolution [a]

Sample Rate

fCON [b]

Averaged

Bandwidth at fCLK

ADC Order

rADC

Digital

Analog

fCLK=3MHz

fCLK=4MHz

fCLK=3MHz

fCLK=4MHz

[Bit]

[Hz]

345

460

130

172

178

237

120

5859

7813

2203

2937

3906

5208

1469

1958

2930

3906

1101

1468

1953

2604

734

979

[a] The ADC resolution should be one bit higher than the required output resolution if the AFE gain is adjusted so that more than 50% of the input

range is used. Otherwise the ADC resolution should be more than one bit higher than the required output resolution.

[b] The sampling rate (A/D conversion time) is only a part of the whole cycle; refer to the ZSC31150 Bandwidth Calculation Spreadsheet for

detailed information.

Note:

The ADC’s reference voltage ADCVREF is defined by the potential between <VBR_T> and <VBR_B> (or <VDDA> to <VSSA>, if

selected in EEPROM by the bit CFGAPP:BREF=1). Theoretically, the input range ADCRANGE_INP of the ADC is equivalent to the ADC’s

reference voltage.

In practice, the maximum ADC input range used should be from 10% to 90% of ADCRANGE_INP, which is a necessary condition for ensuring the

specified accuracy, stability, and nonlinearity parameters of the AFE. This condition is also valid for whole temperature range and all

applicable sensor tolerances. The ZSC31150 does not have an internal failsafe function that verifies that the input meets this condition.

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