Datasheet

AD9974
Rev. A | Page 46 of 52
Address
Data Bit
Content
Default
Value Update Name Description
[10:8] 1 H3DRV H3 Drive Strength.
[11] Unused Set unused bits to 0.
[14:12] 1 H4DRV H4 Drive Strength.
[15] Unused Set unused bits to 0.
[18:16] TESTMODE Test Operation Only. Set to 0.
[19] Unused Set unused bits to 0.
[22:20] 1 RGDRV RG Drive Strength.
[27:23] 0 Unused Set unused bits to 0.
0x36 [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.
0x37 [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 post-divider 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 invert.
1 = invert DCLK to output.
[27:16] Unused Set unused bits to 0.
0x38 [27:0] Unused Set unused register to 0 if this register is accessed.
0x39 [27:0] Unused Set unused register to 0 if this register is accessed.
0x3A [27:0] Unused Set unused register to 0 if this register is accessed.
0x3B [27:0] Unused Set unused register to 0 if this register is accessed.
0x3C [27:0] Unused Set unused register to 0 if this register is accessed.
0x3D [27:0] Unused Set unused register to 0 if this register is accessed.
Table 28. Test Registers—Do Not Access
Address
Data Bit
Content
Default
Value
Update Name Description
0x3E [18:0] 4B020 SCK TESTMODE Test Operation Only. Set to 4B020.
[27:19] Unused Set unused bits to 0.
0x3F [27:0] SCK Unused Set unused register to 0 if these registers are accessed.
0x40 [3:0] F SCK TESTMODE Test Operation Only. Set to F if accessed.
[9:4] 0 TESTMODE Test Operation Only. Set to 0.
[27:10] Unused Set unused bits to 0.
0x41 to
0x4F
[27:0] SCK Unused Set unused register to 0 if these registers are accessed.
0x50 to
0x5F
[27:0] SCK Unused Set unused register to 0 if these registers are accessed.