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Frequency jump with AD9915

Question asked by dts on Mar 30, 2017
Latest reply on Mar 31, 2017 by mcee

Hi!

 

I am trying to implement frequency jump with AD9915.

CFR2.14 bit = 1; registers 0x09 = {0x33, 0x33, 0x33, 0x33} (500MHz) and 0x0A = {0x3D, 0x70, 0xA3, 0xD7} (600MHz), but there is no jump, sweep is continuous from 200MHz to 800MHz. Both no dwell bits are set to enable bidirectional continuous sweep.

Is this because of dwell bits?

It seems lower and upper frequency jump register addresses are swapped on figure 40 of the data sheet.

Register states:

 00: 01 01 00 02
 01: 00 0E 69 00
 02: 00 04 19 3C
 03: 01 05 21 20
 04: 14 7A E1 48
 05: 51 EB 85 1F
 06: 00 00 80 D9
 07: 00 00 80 D9
 08: 00 01 00 01
 09: 33 33 33 33
 0A: 3D 70 A3 D7
 1B: A3 00 08 00

Reference clock is 50MHz. Serial programming mode.

Best regards,

Dmitri

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