Datasheet

AD9271
Rev. B | Page 40 of 60
Addr.
(Hex) Register Name
Bit 7
(MSB) Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1
Bit 0
(LSB)
Default
Value
Notes/
Comments
19 user_patt1_lsb B7 B6 B5 B4 B3 B2 B1 B0 0x00 User-defined
pattern, 1 LSB
(global).
1A user_patt1_msb B15 B14 B13 B12 B11 B10 B9 B8 0x00 User-defined
pattern, 1 MSB
(global).
1B user_patt2_lsb B7 B6 B5 B4 B3 B2 B1 B0 0x00 User-defined
pattern, 2 LSB
(global).
1C user_patt2_msb B15 B14 B13 B12 B11 B10 B9 B8 0x00 User-defined
pattern, 2 MSB
(global).
21 serial_control LSB first
1 = on
0 = off
(default)
X X X <10
MSPS,
low
encode
rate
mode
1 = on
0 = off
(default)
000 = 12 bits (default, normal bit
stream)
001 = 8 bits
010 = 10 bits
011 = 12 bits
100 = 14 bits
0x00 Serial stream
control. Default
causes MSB first
and the native
bit stream
(global).
22 serial_ch_stat X X X X X X Channel
output
reset
1 = on
0 = off
(default)
Channel
power-
down
1 = on
0 = off
(default)
0x00 Used to power
down individ
ual sections of
a converter
(local).
2B flex_filter X Enable
automatic
low-pass
tuning
1 = on
0 = off
(default)
X X X X High-pass filter cutoff
00 = dc (default)
01 = 700 kHz
10 = 350 kHz
0x00 Filter cutoff
(global).
2C analog_input X X X X X X X LOSW-x
1 = on
0 = off
(default)
0x00 LNA active
termination/
input
impedance
(global).
2D cross_point_switch X X X Crosspoint switch enable
0 0000 = CWD0± (differential)
0 0001 = CWD1± (differential)
0 0010 = CWD2± (differential)
0 0011 = CWD3± (differential)
0 0100 = CWD4± (differential)
0 0101 = CWD5± (differential)
0 0111 = power down CW channel
1 0000 = CWD0+ (single ended)
1 0001 = CWD1+ (single ended)
1 0010 = CWD2+ (single ended)
1 0011 = CWD3+ (single ended)
1 0100 = CWD4+ (single ended)
1 0101 = CWD5+ (single ended)
1 0111 = power down CW channel
1 1000 = CWD0− (single ended)
1 1001 = CWD1− (single ended)
1 1010 = CWD2− (single ended)
1 1011 = CWD3− (single ended)
1 1100 = CWD4− (single ended)
1 1101 = CWD5− (single ended)
1 1111 = power down CW channel
0x07 Crosspoint
switch
enable (local).
1
X = an undefined feature