EVAL-AD7760/AD7762EDZ

Rev. PrB | Page 10 of 23

MODULATOR MODE

12. Evaluation of the AD7760 device when using this hardware

and software allows the user to use look at the direct raw

modulator output from the device –bypassing all the

internal FIR filtering.

To enter Modulator mode click the “Modulator Enable”

button as shown in Figure 8. When in Modulator Mode the

green indicator light beside the control button will be

asserted.

Running in modulator mode allows the user to see the

noise shaping provided by the AD7760 Sigma-Delta

modulator as shown in Figure 11.

13. Click the “Modulator Enable” button to get out of the

modulator mode –green indicator light will go off. Reset

by clicking the “RESET” button and finally set the

decimation rate wanted to running with the internal

default FIR filters.

Figure 11.Modulator Mode example of noise shaping provided by the AD7760 Sigma-Delta Modulator. The high frequency content of the modulator output leads to

the coarse nature of the waveform shown.