ZSSC3136 Datasheet

© 2016 Integrated Device Technology, Inc.

13

January 22, 2016

2.3.4.

Analog-to-Digital Converter

The A/D converter is implemented using full-differential switched-capacitor technique.

The A/D conversion is integrating, inherently monotone, and insensitive to short and long term instability of the

equation (1):













=

2

f

2

t

OSC

r

ADC

ADC

(1)

Where

Resolution of A/D conversion

Frequency of internal oscillator (refer to 1.3.1)

Refer to the ZSSC313x Bandwidth Calculation Sheet for a detailed calculation of sampling time and bandwidth.

The result of the A/D conversion is a relative counter result Z corresponding to the following equation:

)

RS

V

V

(

2

Z

ADC_REF

ADC_DIFF

−

⋅

=

(2)

Where

Resolution of A/D conversion

Differential ADC input voltage

RS

Digital ADC Range Shift (RS = 1/16, 1/8, 1/4, 1/2; controlled by the EEPROM contents)

With the RS value, a sensor input signal can be shifted in the optimal input range of the ADC.

The condition required for ensuring the specified accuracy, stability, and non-linearity parameters of the analog

tolerances.