Datasheet

AD9148 Data Sheet
Rev. B | Page 36 of 72
Register Name
Addr
(Hex) Bit Name Function Default
QDAC FSC Adj 34 7:0 QDAC FSC Adj
Q DAC full-scale current adjustment (LSB part). QDAC FS
Adj[9:0] sets the full-scale current of the QDAC. The full-scale
current can be adjusted from 8.64 mA to 31.6 mA in step sizes
of approximately 22.5 µA.
F9
0x000 = 8.64 mA
...
0x200 = 20.14mA
…
0x3FF = 31.66 mA
Set DAC SPI select = 0 to configure DAC 2 path.
Set DAC SPI select = 1 to configure DAC 4 path.
QDAC Control 35 7 QDAC sleep Q DAC sleep mode (fast wake-up mode). 0
1:0 QDAC FSC Adj[9:8] QDAC full-scale current adjustment (MSB part). 01
Set DAC SPI select = 0 to configure DAC 2 path.
Set DAC SPI select = 1 to configure DAC 4 path.
Aux QDAC Data
36
7:0
AUX QDAC Data
Auxiliary QDAC data (LSB part). AUX QDAC Data[9:0] sets
the magnitude of the AUX DAC current. The range is 0 mA
to 2 mA, and the step size is 2 µA.
00
0x000 = 0.000 mA.
0x001 = 0x002 mA.
…
0x3FF = 2.046 mA.
Set DAC SPI select = 0 to configure DAC 2 path.
Set DAC SPI select = 1 to configure DAC 4 path.
Aux QDAC Control 37 7 AUX QDAC sign Auxiliary QDAC output sign. 0
0 = positive, current is directed to the AUXx_P pin.
1 = negative, current is directed to the AUXx_N pin.
6
AUX QDAC
current direction
Auxiliary QDAC current direction. 0
0 = source.
1 = sink.
5
AUX QDAC
power-down
Auxiliary QDAC power-down. 0
1:0
AUX QDAC
Data[9:8]
Auxiliary QDAC data (MSB part). 00
Set DAC SPI select = 0 to configure DAC 2 path.
Set DAC SPI select = 1 to configure DAC 4 path.