Datasheet

AD9920A
Rev. B | Page 100 of 112
Address Data Bits
Default
Value
Update
Type Name Description
0x36 [2:0] 0x01 SCK H1DRV H1 drive strength.
0 = off.
1 = 4.3 mA.
2 = 8.6 mA.
3 = 12.9 mA.
4 = 17.3 mA.
5 = 21.6 mA.
6 = 25.9 mA.
7 = 30.2 mA.
[6:4] 0x1 H2DRV H2 drive strength (same range as H1DRV).
[10:8] 0x1 H3DRV H3 drive strength (same range as H1DRV).
[14:12] 0x1 H4DRV H4 drive strength (same range as H1DRV).
[18:16] 0x1 HLDRV HL drive strength.
0 = off.
1 = 4.3 mA.
2 = 8.6 mA.
3 = 12.9 mA.
4 = 4.3 mA.
5 = 8.6 mA.
6 = 12.9 mA.
7 = 17.3 mA.
[22:20] 0x1 RGDRV RG drive strength (same range as HLDRV).
0x37 [2:0] 0x1 SCK H5DRV H5 drive strength (same range as H1DRV).
[6:4] 0x1 H6DRV H6 drive strength (same range as H1DRV).
[10:8] 0x1 H7DRV H7 drive strength (same range as H1DRV).
[14:12] 0x1 H8DRV H8 drive strength (same range as H1DRV).
[18:16] 0x1 Test Test use only. Set to 1.
[22:20] 0x1 Test Test use only. Set to 1.
0x38 [5:0] 0 SCK SHDLOC SHD sampling edge location.
[13:8] 0x20 SHPLOC SHP sampling edge location.
[21:16] 0x10 SHPWIDTH SHP width (controls input dc restore switch active time).
0x39 [5:0] 0 SCK DOUTPHASEP DOUT phase control, positive edge. Specifies location of DOUT.
[13:8] 0x20 DOUTPHASEN
DOUT phase control, negative edge. Always set to DOUTPHASEP +
32 edges to maintain 50% duty cycle of internal DOUTPHASE clocking.
[16] 0 DCLKMODE DCLK mode.
0 = DCLK tracks DOUT.
1 = DCLK phase is fixed.
[18:17] 0 Test Test use only. Set to 0.
[19] 0 DCLKINV Invert DCLK output.
0 = no inversion.
1 = inversion of DCLK.
[22:20] 0 Test Test use only. Set to 0.
0x3A [27] 0 SCK Test Do not access, or set to 0.
0x3B [27] 0 SCK UNUSED Do not access, or set to 0.
0x3C [27] 0 SCK Test Do not access, or set to 0.
0x3D [27] 0 SCK UNUSED Do not access, or set to 0.
0x3E [27] 0 SCK Test Do not access, or set to 0.
0x3F [27] 0 SCK UNUSED Do not access, or set to 0.
Table 58. Test Registers—Do Not Access
Address Data Bits Default Value Update Type Name Description
0x40 to 0x6F Test registers. Do not access.