Sundance SMT943 - Manual (Page 22)

User Manual SMT943 Page 22 of 54 Last Edited: 23/08/2011 17:24:00
1 01
2 10
3 11
Setting Bit 12 Description CP_MODE
0 0 3V.
1 1 5V
Setting Bit 13 Description CP_DIR
0 0 Positive CP current output
1 1 Negative CP current output
CLOCK Register 1 0x11.
Clock Register 1 0x11
Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
1 Output0 (DAC chc&d clk1) Mode PECLOHISWING Reserved
Default ‘100000’ ‘0’ ‘0’
0 Reserved ICP CP_PRE Reserved
Default ‘00’ ‘0000’ ‘0’ ‘0’
Reset Register 1 0x11
Setting Bit 1 Description CP_PRE - Preset charge pump output voltage to vcc/2
0 0 OFF.
1 1 ON.
Setting Bit 5:2 Description ICP Charge pump current setting
0 0
1 1
Setting Bit 9 Description PECL0HISWING PECL output voltage swing (DAC chc&d clk1)
0 0 Normal Operation.
1 1 High PECL output voltage.
Setting Bit 15:10 Description Output0 (DAC chc&d clk1) mode
0 0 LVPECL only: ‘100000’.
CLOCK Register 2 0x12.
Clock Register 2 0x12
Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
1 Coarse Phase Adjustment[5:0] (Output DAC chc&d clk1 and clk2) Reserved
Default ‘000000’ ‘00’
0 Reserved Reserved
Default ‘0011’ ‘0001’