Datasheet

AD9979
Rev. C | Page 47 of 56
Address
Data Bit
Content
Default
Value
Update
Type Name Description
35 [2:0] 1 SCK H1DRV H1 drive strength.
0 = off.
1 = 4.3 mA.
2 = 8.6 mA.
3 = 12.9 mA.
4 = 17.2 mA.
5 =21.5 mA.
6 = 25.8 mA.
7 = 30.1 mA.
[3] Unused Set unused bits to 0.
[6:4] 1 H2DRV H2 drive strength.
3
[7] Unused Set unused bits to 0.
[10:8] 1 H3DRV H3 drive strength.
3
[11] Unused Set unused bits to 0.
[14:12] 1 H4DRV H4 drive strength.
3
[15] Unused Set unused bits to 0.
[18:16] 1 HLDRV HL drive strength.
3
[19] Unused Set unused bits to 0.
[22:20] 1 RGDRV RG drive strength.
3
[27:23] Unused Set unused bits to 0.
36 [5:0] 0 SCK SHDLOC SHD sampling edge location.
[11:6] 20 SHPLOC SHP sampling edge location.
[17:12] 10 SHPWIDTH SHP width. Controls input dc restore switch active time.
[27:18] Unused Set unused bits to 0.
37 [5:0] 0 SCK DOUTPHASEP DOUT positive edge phase control.
[11:6] 20 DOUTPHASEN
DOUT negative edge phase control. Set DOUTPHASEN =
DOUTPHASEP + 0x20.
[12] 0 DCLKMODE 0 = DCLK tracks DOUT phase.
1 = DCLK is CLI post-Schmitt trigger and postdivider when CLIDIVIDE = 1.
[14:13] 2 CLKDATA_SEL Data output clock selection.
0 = no delay.
1 = ~4 ns.
2 = ~8 ns.
3 =~12 ns.
[15] 0 INV_DCLK 0 = no inversion.
1 = invert DCLK to output.
[27:16] Unused Set unused bits to 0.
38 [27:0] Unused Set unused register to 0 if accessed.
39 [27:0] Unused Set unused register to 0 if accessed.
3A [27:0] Unused Set unused register to 0 if accessed.
3B [27:0] Unused Set unused register to 0 if accessed.
3C [27:0] Unused Set unused register to 0 if accessed.
3D [27:0] Unused Set unused register to 0 if accessed.
1
Recommended setting is enable retime. Enabling retime adds one cycle delay to programmed HBLK positions.
2
See Address 34, Bit 0 for setting options.
3
See Address 35, Bits[2:0] for setting options.