Part Number: AMC7836
Hi team,
our customer found in the application of AMC7836 that the direction of the DAC output current will change during the initialization of AMC7836.
[Application scenario]: AMC7836 positive voltage power supply AVCC=+5V, negative voltage power supply AVSS=AVEE=-10V.
[Initialization process]: (Refer to the description of the relevant registers in the Datasheet) First perform a soft reset through the 0x00 register, then configure the interface to the single command mode through the 0x01 register, and then switch from the "Power Down" mode to the "Normal Operation" mode through the 0x02 register, and then The DAC current as shown in the figure below shows the phenomenon of Source first and then Sink.
[question]:
1. In the above process, why does the DAC rise for a period of time before the voltage drops (about ten us, the DAC current direction is the Source current)?
2. To what extent will this period of lifting be lifted under the worst conditions? Does TI have relevant test results or instructions?
3. Is there any way to optimize and avoid this phenomenon? For example, can optimization be achieved by adjusting the register initialization sequence (for example, first configure the DAC output range to be fixed to -10~0V, and then configure the 0x02 register to switch from "Power Down" mode to "Normal Operation" mode).
