Datasheet

FS98O22
Rev. 1.6 100/146
10. Analog Function Network
Please see Figure 10-1. FS98O22 Analog Function Network has 2 main functions: Low Noise OP Amplifier
(OPAMP) and Sigma Delta Analog to Digital Converter (ADC). OPAMP is used to amplify the input analog
signal for ADC. ADC is used to convert the analog signal to digital signal.
The OPAMP has 2 input ports as inverting side and non-inverting side. Users could setup SOP1P[2:0] and
SOP1N[1:0] to choose the input signals. S_CH1CK[1:0] and OP1EN register flags are used to control OPAMP
and OP1O is the OPAMP output port. The detailed operations will be described in Section 10.2.
The embedded ADC contains sigma delta modulator and digital comb filter. It is a fully differential input
system. User could give 2 signals for differential reference and 2 signals for differential input. ADC will convert
the ratio of differential input to differential reference to 14-bit digital output. The related control instructions will
be illustrated in Section 10.1.
Figure 10-1 FS98O22 analog function network
FORTUNE'
Properties
For Reference Only