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AD9122

Rev. 0 | Page 29 of 56

Reg

Name

Addr

(Hex)

Bit

Name

Description

Default

Aux DAC

Q Data

7:0

Q Aux DAC[7:0]

Q Aux DAC[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 = 0.002 mA.

…

0x3FF = 2.046 mA.

Q Aux

DAC

Control

Q aux DAC sign

0 = the auxiliary DAC Q sign is positive, and the current is

directed to the IOUT2P pin (Pin 58).

1 = the auxiliary DAC Q sign is negative, and the current is

directed to the IOUT2N pin (Pin 59).

Q aux DAC current

direction

0 = the auxiliary DAC Q sources current.

1 = the auxiliary DAC Q sinks current.

Q aux DAC sleep

Q-channel auxiliary DAC sleep

1:0

Q Aux DAC[9:8]

See Register 0x46.

Die Temp

0x48

6:4

FS Current[2:0]

Auxiliary ADC full-scale current.

Range

000 = lowest current.

Control

…

111 = highest current.

3:1

Reference Current[2:0]

Auxiliary ADC reference current.

000 = lowest current.

111 = highest current.

Capacitor value

Auxiliary ADC internal capacitor value.

0 = 5 pF.

1 = 10 pF.

Die

Temp

LSB

7:0

Die Temp[7:0]

See Register 0x4A.

Die

7:0

Die Temp[15:8]

Die Temp[15:0] indicates the approximate die

temperature.

Temp

0xADCC = −39.9°C

MSB

0xC422 = 25.1°C

…

0xD8A8 = 84.8°C (see Temperature Sensor section for details)

SED

Control

SED compare enable

1 = enables the SED circuitry. None of the flags in this

Sample error detected

1 = indicates an error is detected. The bit remains set until

cleared. Any write to this register clears this bit to 0.

Autoclear enable

1 = enables autoclear mode. This activates Bit 1 and Bit 0

of this register and causes Register 0x70 through

consecutive sample data sets are received error free.

Compare fail

1 = indicates an error has been detected. This bit remains

high until it is autocleared by the reception of eight

consecutive error free comparisons or is cleared by

writing to this register.

Compare pass

1 = indicates that the last sample comparison was error free.

Compare

I0 LSBs

7:0

Compare Value I0[7:0]

Compare Value I0[15:0] is the word that is compared

with the I0 input sample captured at the input interface.

Compare

I0 MSBs

7:0

Compare Value I0[15:8]

See Register 0x68.

Compare

Q0 LSBs

7:0

Compare Value Q0[7:0]

Compare Value Q0[15:0] is the word that is compared

with the Q0 input sample captured at the input interface.

AD9122 Datasheet(PDF) 29 Page - Analog Devices

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