ZSC31015EEG1-R datasheet(15/53 Pages) RENESAS

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November 14, 2016

ZSC31015 Datasheet

2.2.4.

Analog-to-Digital Converter (ADC)

A 14-bit/1ms 2

nd order charge-balancing ADC is used to convert signals coming from the pre-amplifier. The

converter, designed in full differential switched capacitor technique, is used for converting the various signals in

the digital domain.

This principle offers the following advantages:



High noise immunity because of the differential signal path and integrating behavior



Independence from clock frequency drift and clock jitter



Fast conversion time due to second-order mode

ur selectable values for the zero point of the input voltage allow conversion to adapt to the sensor’s offset

parameter. With the Reverse Input Polarity Mode and the negative digital gain options, this results in seven

possible zero point adjustments (not eight because the -1/2,1/2 offset setting is the same regardless of gain

polarity).

The conversion rate varies with the programmed update rate. The fastest conversation rate is 1k samples/s and

the response time is then 1ms. Based on a best fit, the Integral Nonlinearity (INL) is less than 4 LSB14Bit.

2.3.

Digital Signal Processor

A digital signal processor (DSP) is used for processing the converted bridge data as well as performing

temperature correction and computing the temperature value for output on the digital channel.

The digital core reads correction coefficients from EEPROM and can correct for the following:

 Bridge Offset

 Bridge Gain

 Variation of Bridge Offset over Temperature (Tco)

 Variation of Bridge Gain over Temperature (Tcg)

 A single second order effect (SOT) (Second Order Term)

The EEPROM contains a single SOT that can be applied to correct one and only one of the following:

 2nd order behavior of bridge measurement

 2nd order behavior of Tco

 2nd order behavior of Tcg

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