I have an EVAL-ADPD105Z-GEN kit with me.
I would like to use the TIA ADC MODE of the ADPD105 with the input to the trans-impedance amplifier as a sine wave.
The connections that I made are:
--> Function generator positive to PD2 pin with a 51 kilo ohm resistor in series to prevent the TIA from saturating
--> Function generator negative to GND
--> I am giving a 1.8V peak-to-peak sine wave as the function generator output.
--> To bypass the band-pass filter, I am using the ADPD OpenMarket Wavetool to write the values 0xAE65 to the register 0x43 and 0x45 (register values have been taken according to the datasheet's specifications).
--> I am also writing 0x1CB6 to the registers 0x42 and 0x44 in order to configure the integrator as an inverting buffer TIA I would using the 0.9V VBIAS setting (0x42[5:4] = 0x44[5:4] = 0x2)
ADC output is 8100-8300 codes，why 1.8V peak-to-peak sine wave input, but output is small rang,can i config the TIA to get 0-16384 codes?