Datasheet

FS98O22
Rev. 1.6 109/146
10.1. Analog to Digital Converter (ADC) :
Please see Figure 10-2. ADC Module contains 3 main functions – Low Pass Filter, Sigma Delta Modulator and
Comb Filter. Before doing the AD conversion, User could reduce the low frequency noise by the embedded
Low Pass Filter. The SINH[2:0] register flags are used to choose the input signal. SFTA[2] flag is used to enable
the Filter. Sigma Delta Modulator and Comb Filter are used to complete the AD Converter. First of all the
Modulator will output serial bits to show the ratio of the difference between INH and INL to the difference
between VRH and VRL. For example, if the ratio of VRH and VRL to INH and INL is 7/10, the output bit series
will be 7 ‘bit1’ every 10 bits in average. Comb Filter is used to increase the SNR(signal-noise ratio) and the real
ADC output, ADO, will be 14-bit precision in FS98O22.
Figure 10-2 FS98O22 ADC function block
FORTUNE'
Properties
For Reference Only