Analog Devices ADuCM356 Reference Manual page 107

Reference Manual
HIGH-SPEED DAC CIRCUITS
Gain calibration is optional and adjusts the peak-to-peak voltage
swing. The peak-to-peak voltage swing can also be adjusted by
changing the minimum and maximum DAC codes.
The high-speed DAC transfer function is shown in
Note that in Figure 26 the common-mode voltage setting for the
The example functions provided in the EVAL-ADuCM356QSPZ kit
demonstrate how to use the ADC to measure the differential voltage
across R and how to adjust the appropriate offset calibration
CAL
resistor until this differential voltage is approximately 0 V.
Table 127. High-Speed Calibration Register Assignment for Each Output Range
HSDACCON, HSDACCON,
Bit 12 Setting Bit 0 Setting
0 0
1 0
1 1
0 1
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Figure 25. High-Speed DAC Transfer Function
Figure 25.
Figure 26. High-Speed DAC Calibration Circuit Using R
Typical Output Range
(Code 0x200 to Code 0xE00)
±607 mV
±75 mV
±15.14 mV
±121.2 mV
calibration circuit is set by the noninverting input of the high speed
TIA.
CAL
Table 127 shows the appropriate calibration for each high-speed
DAC output setting and the selected power mode of the analog die.
Relevant Calibration Registers
Low-Power Mode High-Power Mode
DACOFFSET DACOFFSETHP
DACOFFSET DACOFFSETHP
DACOFFSETATTEN DACOFFSETATTENHP
DACOFFSETATTEN DACOFFSETATTENHP
ADuCM356
Low-Power Mode/
High-Power Mode
DACGAIN
DACGAIN
DACGAIN
DACGAIN
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