AD9148BPCZ datasheet(34/73 Pages) AD

34 / 73 page

AD9148

Preliminary Technical Data

Rev. PrA | Page 34 of 73

Addr

(Hex)

Bit

Name

Function

Default

IDAC FSC Adj

7:0

IDAC FSC Adj[7:0]

IDAC full-scale current adjustment (LSB part). IDAC FS Adj[9:0]

sets the full-scale current of the IDAC. The full-scale current

can be adjusted from 8.64 mA to 31.6 mA in step sizes of

approximately 22.5 μA.

0x000 = 8.64 mA.

...

0x200 = 20.14 mA.

…

0x3FF = 31.66 mA.

Set DAC SPI select = 0 to configure DAC 1 path.

Set DAC SPI select = 1 to configure DAC 3 path.

IDAC Control

IDAC sleep

I DAC sleep mode (fast wake-up mode).

1:0

IDAC FSC Adj[9:8]

IDAC full-scale current adjustment (MSB part)

Set DAC SPI select = 0 to configure DAC 1 path.

Set DAC SPI select = 1 to configure DAC 3 path.

Aux IDAC Data

7:0

AUX IDAC Data[7:0]

Auxiliary IDAC data (LSB part). AUX IDAC 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.

0x000 = 0.000 mA.

0x001 = 0x002 mA.

…

0x3FF = 2.046 mA.

Set DAC SPI select = 0 to configure DAC 1 path.

Set DAC SPI select = 1 to configure DAC 3 path.

Aux IDAC Control

AUX IDAC sign

Auxiliary IDAC output sign.

0 = positive, current is directed to the AUXx_P pin.

1 = negative, current is directed to the AUXx_N pin.

AUX IDAC

current direction

Auxiliary IDAC current direction.

0 = source.

1 = sink.

AUX IDAC

power down

Auxiliary IDAC power down.

1:0

AUX IDAC Data[9:8]

Auxiliary IDAC data (MSB part).

Set DAC SPI select = 0 to configure DAC 1 path.

Set DAC SPI select =1 to configure DAC 3 path.

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