Sundance SMT399-160 - Manual (Page 23)

Setting Internal
Profile
Control
(Bit 13-11)
Description
Internal Profile control.
DDS0 Register – 0x7 – Control Function Register
Setting Load ARR
@IO UD
(Bit 10)
Description
0 0 The Amplitude Ramp Rate timer is loaded only upon timeout and is not loaded due to an Io
Update input signal.
1 1 The Amplitude Ramp Rate timer is loaded only upon timeout and is loaded due to an Io Update
input signal.
DDS0 Register – 0x7 – Control Function Register
Setting OSK
Enable
(Bit 9)
Description
0 0 Shaped on-off keying is bypassed.
1 1 Shaped on-off keying is enabled.
DDS0 Register – 0x7 – Control Function Register
Setting Auto OSK
Keying
(Bit 8)
Description
0 0 Manual on-off keying operation selected.
1 1 Automatic on-off keying operation selected.
DDS0 Register – 0x7 – Control Function Register
Setting Auto Synch
Enable
(Bit 7)
Description
0 0 The auto synchronisation of multiple AD9954 is inactive.
1 1 The auto synchronisation of multiple AD9954 is active.
DDS0 Register – 0x7 – Control Function Register
Setting Soft
Manual
Synch (Bit
6)
Description
0 0 The manual synchronisation of multiple AD9954 is inactive.
1 1 The manual synchronisation of multiple AD9954 is active.
DDS0 Register – 0x7– Control Function Register
Setting Linear
Sweep
Enable
(Bit 5)
Description
0 0 The linear frequency sweep capabilities are inactive.
1 1 The linear frequency sweep capabilities are active.
5.4.9 DDS0 Register – 0x8 – Control Function Register.
For more details, refer to AD9954 datasheet.
DDS0 Register – 0x8 – Control Function Register
Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 RefClk Multiplier VCO Range Charge Pump Current
Default ‘00000’ ‘0’ ‘00’
User Manual SMT399-160 Page 23 of 39 Last Edited: 24/05/2007 17:12:00