ZSSC3036 datasheet(13/48 Pages) IDT

13 / 48 page

ZSSC3036 Datasheet

April 20, 2016

3) Determine which of the two following cases is valid.

a. If RatioOffset – A2D_offset

≤ 0 then calculate

Theoretical optimum gain: Gainopt =(1 – A2D_offset) * Vref / Vmax

b. If RatioOffset – A2D_offset > 0 then calculate

Theoretical optimum gain: Gainopt = A2D_offset * Vref / |Vmin|

with:

Vref = Vrefp – Vrefn = 0.94·VDDB,min ≈ 1.5V

Finally, select the setup gain (Gainsetup) as the nearest gain to Gainopt, where Gainsetup

≤ Gain

opt.

2.3.2.

Analog-to-Digital Converter

A second-order charge-balancing analog-to-digital converter (ADC) is used to convert the amplifier signal. To

allow optimizing the trade-off between conversion time and resolution, the conversion is split into a MSB coarse

conversion and an LSB fine conversion. The final ADC resolution is determined by MSB + LSB. For the bridge

measurement, the MSB-LSB segmentation is programmable via the Msb and Lsb settings in the BM_config

measurement, the MSB-LSB segmentation is programmable via the Temp_ADC settings in the BM_config

The conversion time is proportional to 2

MSB +2LSB. During the MSB coarse conversion, the ADC input signal is

sampled and integrated 2

MSB times, resulting in inherit low-pass behavior and noise suppression. The longer the

MSB coarse conversion is, the better the noise suppression is. Possible settings are listed below in Table 2.4 and

Table 2.5.

Table 2.4

MSB/LSB Segmentation Settings for Bridge Measurement

Msb Setup Bits [7:6]

in BM_config

Number of MSB Coarse

Conversion Bits

Lsb Setup Bits [9:8]

in BM_config

Number of LSB Fine

Conversion Bits

00BIN

01BIN

10BIN

11BIN

Table 2.5

MSB/LSB Segmentation Settings for Temperature Measurement

Temp_ADC Setup Bits

[14:13] in BM_config

Number of MSB Coarse

Conversion Bits

Number of LSB Fine

Conversion Bits

00BIN

Setup according to IDT configuration in reserved memory

(recommended setup for best performance and speed trade-off)

01BIN

10BIN

11BIN

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