SLAS666B January 2010 – October 2018 TLV320DAC3101
PRODUCTION DATA.
The following paragraphs are intended to guide a user through the steps necessary to configure the .
Step 1
The system clock source (master clock) and the targeted DAC sampling frequency must be identified.
Depending on the targeted performance, the decimation filter type (A, B, or C) and DOSR value can be determined:
In all cases, DOSR is limited in its range by the following condition:
2.8 MHz < DOSR × DAC_fS < 6.2 MHz
Based on the identified filter type and the required signal-processing capabilities, the appropriate processing block can be determined from the list of available processing blocks (PRB_P1 to PRB_P25).
Based on the available master clock, the chosen DOSR and the targeted sampling rate, the clock-divider values NDAC and MDAC can be determined. If necessary, the internal PLL can add a large degree of flexibility.
In summary, CODEC_CLKIN (derived directly from the system clock source or from the internal PLL) divided by MDAC, NDAC, and DOSR must be equal to the DAC sampling rate, DAC_fS. The CODEC_CLKIN clock signal is shared with the DAC clock-generation block.
CODEC_CLKIN = NDAC × MDAC × DOSR × DAC_fS
To a large degree, NDAC and MDAC can be chosen independently in the range of 1 to 128. In general, NDAC should be as large as possible as long as the following condition can still be met:
MDAC × DOSR / 32 ≥ RC
RC is a function of the chosen processing block and is listed in Table 6-11.
The common-mode voltage setting of the device is determined by the available analog power supply.
At this point, the following device-specific parameters are known: PRB_Px, DOSR, NDAC, MDAC, input and output common-mode values. If the PLL is used, the PLL parameters P, J, D, and R are determined as well.
Step 2
Setting up the device via register programming:
The following list gives an example sequence of items that must be executed in the time between powering the device up and reading data from the device. Note that there are other valid sequences, depending on which features are used.
A detailed example can be found in Section 6.3.10.15.