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AD5933 with big errors

Question asked by zone.zone on Mar 11, 2015
Latest reply on Mar 12, 2015 by mcee

AD5933框图.png

experiment with sample circuit, voltage source ADR433, resistor connected between VOUT and VIN  1kΩ and the feedback resistor  1kΩ to calibrate the gain factor.internal crystal oscillator ,excitation frequency 30Khz , 1Vpp.

1K2K3K5.1K6.8K7.5K8.2K10Kreal
10001806261743165689626368618316measure(Ω)

 

  only the integer part is given.

external crystal oscillator 163.84Mhz ,excitation frequency 30Khz , 1Vpp or 2Vpp ,the result is similar to the above.

questions:

1.why so big errors?

2.the chip pin 12(DGND) 13(AGND) 14(AGND) is short measured by multimeter . the chip designed   or my chip is broken?

 

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