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FS98O21 Datasheet(PDF) 90 Page - Fortune Semiconductor Corp. |
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FS98O21 Datasheet(HTML) 90 Page - Fortune Semiconductor Corp. |
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90 / 136 page  FS98O21 Rev. 1.7 90/136 10. Analog Function Network Please see Figure 10-1. FS98O21 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. SO P1P[2:0] AIN0 AIN1 AIN2 AIN3 AIN4 AIN5 TEM P H AGND OP 1 OP 1O + _ OP 1E N S _C H 1C K [1:0] OP 1P S IN H [2:0] OP 1O OP 1P VR H VR L TE M P H AIN5 AIN4 AGND FTIN SIN L [1:0] AIN 1 AIN 2 AIN 3 TE M P L IN L SF TA [1:0] FTB FTIN AIN 2 AIN 3 IN H SV R L [1:0] AGND AIN2 VR L SV R H [1:0] VR H AD C A D O [15:0] AD R S T AD E N A D G [1:0] VR H V RL IN H IN L AZ FTC FT B 100K AD M [2:0] AIN0 AIN3 VR1P VR2P AIN1 VR2P 60K 20K 20K VR1P VR 2P AG ND REF O SRE F O SO P1N [1:0] OP 1O AIN 4 AIN 5 AIN 3 OP 1N VRP Figure 10-1 FS98O21 analog function network |
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