PCM1690-Q1: Unused pin termination

Yuta Kurimoto

Expert 8260 points

Part Number: PCM1690-Q1

Hello Team,

I have question about unused pin.

Q. Regarding with DIN1-4 pin, How to terminate these pin? Do we need add pull-down resistor?

Q. Regarding with VOUT1-8+, VOUT1-8-, can these pin left OPEN when unused?

Q. Regarding with MS/ADR0/RSV, TEST/ADR1/RSV, when we set these pin LOW, Can we connect to DGND? (not AGND?)

Thanks,

Yuta Kurimoto

over 3 years ago

0 Paul_Frost over 3 years ago

TI__Guru 52663 points

Hi Kurimoto-san,

1. You should connect these to GND if you are not using them. That can be via resistor if you want, but it is not necessary.

2. The VOUTx pins can be left floating if unused.

3. Yes, I recommend connecting them to DGND, but they are not a source of noise so you can connect them to the most convenient ground. It only matters that they are below the VIL level.

Thanks,

Paul

0 Yuta Kurimoto over 3 years ago in reply to Paul_Frost

TI__Expert 8260 points

Hello Paul,

Let me ask additional question for Q3.

When we connect the pins(MS/ADR0/RSV, TEST/ADR1/RSV) to DGND, Do we need to use external pull-down resistor?

Thanks,

Yuta Kurimoto

0 Paul_Frost over 3 years ago in reply to Yuta Kurimoto

TI__Guru 52663 points

Hi Kurimoto-san,

Pull-down resistors are not required for these pins. They can be connected directly to ground.

Thanks,

Paul

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PCM1690-Q1: Unused pin termination