This is about receiving data register contents from AD7712.
First of all, I am using an Automatic Test Equipement to evaluate the AD7712. The ATE acts as a microcontroller to drive and read data from the ADC. From the ATE we have also the supply voltages (AVdd and DVdd).
Master Clock is supply by an external fonction generator ( Square 10 MHz - CMOS Level )
The problem is that AD7712 cannot output Data. The outputs from the Data Reqister are always low.
I respect the latency and the time for the output data rate
I follow the the Figure 13a on page 22 of the specification REV. F for the timing for reading operation from the data register
I would like my system to read data register continuously.
1. Power on
2 Activation of external MCLK
3. write control register (to enable 24-bit reading)
4. read control register (to check if control reg is written correctly)
5 Send differential voltage to AIN1
6 read data register with the ATE
+2.5V on ref in+
GND on ref in-
external clocking at 10.00MHz CMOS Level (to MCLK IN)
UNIpolar input on AIN1 AIN2 unused
mode to gnd
standby to +5V
control register setting:
operating mode = normal, MD2=0, MD1=0, MD0=0
pga gain = 1, G2=0, G1=0, G0=0
channel selection = AIN1 low-level input, CH=0
power-down = normal,PD=0
word-length = 24-bit, WL=1
reserved = 1
burnout current = off, BO=0
bipolar/unipolar selection = bipolar, B/U = 1
filter selection, FS11-FS0, 12-bit, d1920
Thanks for your help