Hi, i am doubtful on my readings for the real and imag data. Will need help from you guys
These are my test setup
I am using the CN0349 eval kit.
Set AD5934 to standby mode:
address 0x80: write 0xB1
address 0x81: write 0x08
- 2.0 V p.p
- Gain 1
- External system clock
address 0x80: write 0x11
address 0x80: write 0x21
address 0x82, x83, x84: write 0x418937
- with MCLK = 1Mhz at U6
address 0x85,x86: write 0x0000
- no increment
Number of Increment:
address 0x88,x89: write 0x0001
-number of increment = 1
Number of settling time:
address 0x8A, x8B: write 0x000C
Rcal1: Cal resistor = 100 ohm, RFB = 100ohms
Rcal2: Cal resistor = 1kohm, RFB = 100ohms
I plotted the graph out and its downward line(attached pic), which gave me a negative gradient, do not tally with the Application notes of CN0349 which is a positive gradient.
Could anyone spot what have i done wrong?