AD9122 Analog Devices, AD9122 Datasheet - Page 27

• Manufacturer Part Number: AD9122
• Manufacturer: Analog Devices

Specifications of AD9122

• Resolution (bits): 16bit
• Dac Update Rate: 1.23GSPS
• Dac Settling Time: n/a
• Max Pos Supply (v): +3.47V
• Single-supply: No
• Dac Type: Current Out
• Dac Input Format: LVDS,Par

Register
Name
Datapath
Control
HB1 Control
HB2 Control
Address
(Hex)
0x1B
0x1C
0x1D
Bits
7
6
5
3
2
1
0
[2:1]
0
[6:1]
0
Name
Bypass premod
Bypass sinc
Bypass NCO
NCO gain
Bypass phase
compensation
and dc offset
Select sideband
Send I data to Q data
HB1[1:0]
Bypass HB1
HB2[5:0]
Bypass HB2
−1
Rev. B | Page 27 of 60
Description
1 = bypass the f
1 = bypass the inverse sinc filter.
1 = bypass the NCO.
0 = no gain scaling is applied to the NCO input to the
internal digital modulator (default).
1 = gain scaling of 0.5 is applied to the NCO input to the
internal digital modulator. Gain scaling can eliminate satu-
ration of the modulator output for some combinations of
data inputs and NCO signals.
1 = bypass phase compensation and dc offset.
0 = the modulator outputs the high-side image.
1 = the modulator outputs the low-side image. The image is
spectrally inverted compared to the input data.
1 = ignore Q data from the interface and disable the clocks
to the Q datapath. Send I data to both the I and Q DACs.
Modulation mode for I Side Half-Band Filter 1.
00 = input signal not modulated; filter pass band is from
−0.4 to +0.4 of f
01 = input signal not modulated; filter pass band is from
0.1 to 0.9 of f
10 = input signal modulated by f
0.6 to 1.4 of f
11 = input signal modulated by f
1.1 to 1.9 of f
1 = bypass the first-stage interpolation filter.
Modulation mode for I Side Half-Band Filter 2.
000000 = input signal not modulated; filter pass band is
from −0.25 to +0.25 of f
001001 = input signal not modulated; filter pass band is
from 0.0 to 0.5 of f
010010 = input signal not modulated; filter pass band is
from 0.25 to 0.75 of f
011011 = input signal not modulated; filter pass band is
from 0.5 to 1.0 of f
100100 = input signal modulated by f
from 0.75 to 1.25 of f
101101 = input signal modulated by f
from 1.0 to 1.5 of f
110110 = input signal modulated by f
from 1.25 to 1.75 of f
111111 = input signal modulated by f
from 1.5 to 2.0 of f
1 = bypass the second-stage interpolation filter.
IN1
IN1
IN1
.
.
.
S
IN1
/2 premodulator.
.
IN2
IN2
IN2
IN2
.
.
.
.
IN2
IN2
IN2
.
.
.
IN2
.
IN1
IN1
; filter pass band is from
; filter pass band is from
IN2
IN2
IN2
IN2
; filter pass band is
; filter pass band is
; filter pass band is
; filter pass band is
Default
1
1
1
0
1
0
0
00
0
000000
0
AD9122