Datasheet

AD9645 Data Sheet
Rev. 0 | Page 32 of 36
Addr.
(Hex)
Parameter Name
Bit 7
(MSB)
Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1
Bit 0
(LSB)
Default
Value
(Hex)
Comments
0x21 Serial output
data control
(global)
LVDS
output
0 = MSB
first
(default)
1 = LSB
first
SDR/DDR one-lane/two-lane,
bitwise/bytewise, Bits[6:4]
000 = SDR two-lane, bitwise
001 = SDR two-lane, bytewise
010 = DDR two-lane, bitwise
011 = DDR two-lane, bytewise
(default)
100 = DDR one-lane, wordwise
Encode
mode
0 =
normal
encode
rate mode
(default)
1 = low
encode
mode for
sample
rate of
<20 MSPS
0 = 1×
frame
(default)
1 = 2×
frame
Serial output
number of bits
00 = 16 bits (default)
10 = 12 bits
0x30 Serial stream
control.
Sample rate of
<20 MSPS
requires that
Bits[6:4] = 100
(DDR one-lane)
and Bit 3 = 1
(low encode
mode).
0x22 Serial channel
status (local)
Open Open Open Open Open Open Channel
output
reset
Channel
power-
down
0x00 Used to
power down
individual
sections of
a converter.
0x100 Resolution/
sample rate
override
Open Resolution/
sample rate
override enable
Resolution
01 = 14 bits
10 = 12 bits
Open Sample rate
000 = 20 MSPS
001 = 40 MSPS
010 = 50 MSPS
011 = 65 MSPS
100 = 80 MSPS
101 = 105 MSPS
110 = 125 MSPS
0x00 Resolution/
sample rate
override
(requires
writing to
the transfer
register,
0xFF).
0x101 User I/O Control 2 Open Open Open Open Open Open Open SDIO
pull-down
0x00 Disables SDIO
pull-down.
0x102 User I/O Control 3 Open Open Open Open VCM
power-
down
Open Open Open 0x00 VCM control.