Datasheet

AD9277
Rev. 0 | Page 44 of 48
Addr.
(Hex) Register Name
Bit 7
(MSB) Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1
Bit 0
(LSB)
Default
Value Comments
0x19 user_patt1_lsb B7 B6 B5 B4 B3 B2 B1 B0 0x00 User-Defined
Pattern 1, LSB
(global).
0x1A user_patt1_msb B15 B14 B13 B12 B11 B10 B9 B8 0x00 User-Defined
Pattern 1, MSB
(global).
0x1B user_patt2_lsb B7 B6 B5 B4 B3 B2 B1 B0 0x00 User-Defined
Pattern 2, LSB
(global).
0x1C user_patt2_msb B15 B14 B13 B12 B11 B10 B9 B8 0x00 User-Defined
Pattern 2, MSB
(global).
0x21 serial_control LSB first
1 = on
0 = off
(default)
X X X <10
MSPS,
low
encode
rate
mode
1 = on
0 = off
(default)
Serial bit stream length
000 = 14 bits (default, normal
bit stream)
001 = 8 bits
010 = 10 bits
011 = 12 bits
100 = 14 bits
0x00 Serial stream
control (global).
0x22 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 individual
sections of a
converter (local).
0x2B flex_filter X Enable
automatic
low-pass
tuning
1 = on
(self-
clearing)
X X High-pass filter cutoff
0000 = f
LP
/20.7
0001 = f
LP
/11.5
0010 = f
LP
/7.9
0011 = f
LP
/6.0
0100 = f
LP
/4.9
0101 = f
LP
/4.1
0110 = f
LP
/3.5
0111 = f
LP
/3.1
0x00 Filter cutoff
(global).
(f
LP
= low-pass
filter cutoff
frequency.)
0x2C analog_input X X X X X X LO-x, LOSW-x
connection
00 = (−)LNA output,
high-Z
01 = (−)LNA output,
(−)LNA output
10 = (−)LNA output,
(+)LNA output
11 = high-Z, high-Z
0x00 LNA active
termination/input
impedance
(global).
0x2D CW Doppler
I/Q demodulator
phase
X X X CW
Doppler
channel
enable
1 = on
0 = off
I/Q demodulator phase
0000 = 0°
0001 = 22.5°
0010 = 45°
0011 = 67.5°
0100 = 90°
0101 = 112.5°
0110 = 135°
0111 = 157.5°
1000 = 180°
1001 = 202.5°
1010 = 225°
1011 = 247.5°
1100 = 270°
1101 = 292.5°
1110 = 315°
1111 = 337.5°
Phase of
demodulators
(local).