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.