CH32V307-DAC

The CH32V307 is equipped with two 12-bit DACs, with quite fast settling times. There is an Output Buffer which is needed to drive any load with lower impedance than a few hundred kilo-ohms.

Development Notes

• The output impedance is a concern. Without the Output Buffer enabled, >100kohm impedance for the load is needed. Even WITH Output Buffer enabled, a 1kohm load is not really possible, both high and low end of range is not reached, which is a bit strange. 10kohm hasn't been tested yet, but datasheet indicates that a 5kohm load should be fine.

• For fastest write to DAC output, this is used;

DAC->RD12BDHR = dac_value1 + (dac_value2 << 16);

• Simple initialization is;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE );

    DAC_InitTypeDef DAC_InitType={0};
    DAC_InitType.DAC_Trigger=DAC_Trigger_None;
    DAC_InitType.DAC_WaveGeneration=DAC_WaveGeneration_None;
    DAC_InitType.DAC_OutputBuffer=DAC_OutputBuffer_Enable;
    DAC_Init(DAC_Channel_1,&DAC_InitType);
    DAC_Init(DAC_Channel_2,&DAC_InitType);

    DAC_Cmd(DAC_Channel_1, ENABLE);
    DAC_Cmd(DAC_Channel_2, ENABLE);