Datasheet

AD9125
Rev. 0 | Page 25 of 56
Register
Name
Address
(Hex) Bits Name Description Default
1 Select sideband 0 = the modulator outputs high-side image. 0
1 = the modulator outputs low-side image. The image is
spectrally inverted compared with the input data.
0 Send I data to Q data
1 = ignores Q data from the interface and disables the
clocks to the Q datapath. Sends I data to both the I and
Q DACs.
0
HB1 Control 0x1C [2:1] HB1[1:0]
00 = input signal is not modulated; filter pass band is
from −0.4 to +0.4 of f
IN1
.
0
01 = input signal is not modulated; filter pass band is
from 0.1 to 0.9 of f
IN1
.
10 = input signal is modulated by f
IN1
; filter pass band is
from 0.6 to 1.4 of f
IN1
.
11 = input signal is modulated by f
IN1
; filter pass band is
from 1.1 to 1.9 of f
IN1
.
0 Bypass HB1 1 = bypasses first-stage interpolation filter. 0
HB2 Control 0x1D [6:1] HB2[5:0] Modulation mode for I Side Half-Band Filter 2. 0
000000 = input signal is not modulated; filter pass band
is from −0.25 to +0.25 of f
IN2
.
001001 = input signal is not modulated; filter pass band
is from 0.0 to 0.5 of f
IN2
.
010010 = input signal is not modulated; filter pass band
is from 0.25 to 0.75 of f
IN2
.
011011 = input signal is not modulated; filter pass band
is from 0.5 to 1.0 of f
IN2
.
100100 = input signal is modulated by f
IN2
; filter pass
band is from 0.75 to 1.25 of f
IN2
.
101101 = input signal is modulated by f
IN2
; filter pass
band is from 1.0 to 1.5 of f
IN2
.
110110 = input signal is modulated by f
IN2
; filter pass
band is from 1.25 to 1.75 of f
IN2
.
111111 = input signal is modulated by f
IN2
; filter pass
band is from 1.5 to 2.0 of f
IN2
.
0 Bypass HB2 1 = bypasses second stage interpolation filter. 0
HB3 Control 0x1E [6:1] HB3[5:0] Modulation mode for I Side Half-Band Filter 3. 0
000000 = input signal is not modulated; filter pass band
is from −0.2 to +0.2 of f
IN3
.
001001 = input signal is not modulated; filter pass band
is from 0.05 to 0.45 of f
IN3
.
010010 = input signal is not modulated; filter pass band
is from 0.3 to 0.7 of f
IN3
.
011011 = input signal is not modulated; filter pass band
is from 0.55 to 0.95 of f
IN3
.
100100 = input signal is modulated by f
IN3
; filter pass
band is from 0.8 to 1.2 of f
IN3
.
101101 = input signal is modulated by f
IN3
; filter pass
band is from 1.05 to 1.45 of f
IN3
.
110110 = input signal is modulated by f
IN3
; filter pass
band is from 1.3 to 1.7 of f
IN3
.
111111 = input signal is modulated by f
IN3
; filter pass
band is from 1.55 to 1.95 of f
IN3
.
0 Bypass HB3 1 = bypasses third-stage interpolation filter. 0
Chip ID 0x1F [7:0] Chip ID[7:0] This register identifies the device as an AD9125. 8