DAC63202 datasheet(39/83 Pages) TI

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7.4.5.2 Function Generation

The DACx3202 implement a continuous function or waveform generation feature. These devices can generate a

triangular wave, sawtooth wave, and sine wave independently for every channel.

7.4.5.2.1 Triangular Waveform Generation

The triangular waveform uses the DAC-X-MARGIN-LOW and DAC-X-MARGIN-HIGH registers for minimum

and maximum levels, respectively. Equation 6 shows that the frequency of the waveform depends on the min

and max levels, CODE-STEP and SLEW-RATE settings. An external RC load with a time-constant larger than

the slew-rate settings can be dominant over the internal frequency calculation. The CODE-STEP-X and SLEW-

RATE-X settings are available in the DAC-X-FUNC-CONFIG register. Writing 0b000 to the FUNC-CONFIG-X bit

field in the DAC-X-FUNC-CONFIG register selects triangular waveform.

fTRIANGLE_WAVE=

2×SLEW_RATE× MARGIN_HIGH−MARGIN_LOW+1

CODE_STEP

(6)

where:

• SLEW_RATE is the SLEW-RATE-X setting specified in Table 7-6.

• CODE_STEP is the CODE-STEP-X setting specified in Table 7-5.

• MARGIN_HIGH is the DAC-X-MAGIN-HIGH specified in Section 7.6.2.

• MARGIN_LOW is the DAC-X-MAGIN-LOW specified in Section 7.6.3.

7.4.5.2.2 Sawtooth Waveform Generation

The sawtooth and the inverse sawtooth waveforms use the DAC-X-MARGIN-LOW and DAC-X-MARGIN-HIGH

registers for minimum and maximum levels, respectively. Equation 7 shows that the frequency of the waveform

depends on the min and max levels, CODE-STEP and SLEW-RATE settings. An external RC load with a

time constant larger than the slew-rate settings can be dominant over the internal frequency calculation. The

CODE-STEP-X and SLEW-RATE-X settings are available in the DAC-X-FUNC-CONFIG register. Write 0b001

to the FUNC-CONFIG-X bit field in the DAC-X-FUNC-CONFIG register to select sawtooth waveform, and write

0b010 to select inverse sawtooth waveform.

fSAWTOOTH_WAVE=

SLEW_RATE× MARGIN_HIGH−MARGIN_LOW+1

CODE_STEP

(7)

where:

• SLEW_RATE is the SLEW-RATE-X setting specified in Table 7-6.

• CODE_STEP is the CODE-STEP-X setting specified in Table 7-5.

• MARGIN_HIGH is the DAC-X-MAGIN-HIGH specified in Section 7.6.2.

• MARGIN_LOW is the DAC-X-MAGIN-LOW specified in Section 7.6.3.

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DAC53202, DAC63202

SLASF47 – MAY 2022

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DAC63202 Datasheet(PDF) 39 Page - Texas Instruments