AD9122 Analog Devices, AD9122 Datasheet - Page 29

• 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
Q DAC
Offset LSB
Q DAC
Offset MSB
I DAC
FS Adjust
I DAC
Control
I Aux DAC
Data
I Aux DAC
Control
Q DAC
FS Adjust
Q DAC
Control
Q Aux DAC
Data
Address
(Hex)
0x3E
0x3F
0x40
0x41
0x42
0x43
0x44
0x45
0x46
Bits
[7:0]
[7:0]
[7:0]
7
[1:0]
[7:0]
7
6
5
[1:0]
[7:0]
7
[1:0]
[7:0]
Name
Q DAC Offset[7:0]
Q DAC Offset[15:8]
I DAC FS Adj[7:0]
I DAC sleep
I DAC FS Adj[9:8]
I Aux DAC[7:0]
I aux DAC sign
I aux DAC current
direction
I aux DAC sleep
I Aux DAC[9:8]
Q DAC FS Adj[7:0]
Q DAC sleep
Q DAC FS Adj[9:8]
Q Aux DAC[7:0]
Rev. B | Page 29 of 60
Description
See Register 0x3F.
Q DAC Offset[15:0] is a value that is added directly to the
samples written to the Q DAC.
See Register 0x41, Bits[1:0].
1 = puts the I DAC into sleep mode (fast wake-up mode).
I DAC FS Adj[9:0] sets the full-scale current of the I DAC.
The full-scale current can be adjusted from 8.64 mA to
31.68 mA in step sizes of approximately 22.5 μA.
0x000 = 8.64 mA.
…
0x200 = 20.16 mA.
…
0x3FF = 31.68 mA.
See Register 0x43, Bits[1:0].
0 = the I auxiliary DAC sign is positive, and the current is
directed to the IOUT1P pin (Pin 67).
1 = the I auxiliary DAC sign is negative, and the current is
directed to the IOUT1N pin (Pin 66).
0 = the I auxiliary DAC sources current.
1 = the I auxiliary DAC sinks current.
1 = puts the I auxiliary DAC into sleep mode.
I Aux DAC[9:0] sets the magnitude of the auxiliary DAC
current. The range is 0 mA to 2 mA, and the step size is 2 μA.
0x000 = 0.000 mA.
0x001 = 0.002 mA.
…
0x3FF = 2.046 mA.
See Register 0x45, Bits[1:0].
1 = puts the Q DAC into sleep mode (fast wake-up mode).
Q DAC FS Adj[9:0] sets the full-scale current of the Q DAC.
The full-scale current can be adjusted from 8.64 mA to
31.68 mA in step sizes of approximately 22.5 μA.
0x000 = 8.64 mA.
…
0x200 = 20.16 mA.
…
0x3FF = 31.68 mA.
See Register 0x47, Bits[1:0].
Default
00000000
00000000
11111001
0
01
00000000
0
0
0
00
11111001
0
01
00000000
AD9122