[SOLVED] Is 1/2 Vss = floating

[sharethl]

Hi,

An ADC datasheet said: if Pin4 is floating => DDR mode, if not floating => SDR mode,
The schematic I saw connected this pin to voltage divider to get 1/2 Voltage supply,
Is this ADC configured as DDR or SDR?
floating means pin is not connected, but what 1/2 Vss

Thanks.

 

[godfreyl]

Which ADC? Can you give a link to the datasheet?

 

[sharethl]

Which ADC? Can you give a link to the datasheet?

Here is the datasheet, on page 31, Table 2, first row.
https://www.ti.com/lit/ds/symlink/adc08d1500.pdf

 

[FvM]

Just read the text completely: "When this pin is floating or connected to 1/2 the supply voltage"...

 

[godfreyl]

Page 4 also describes how pin 4 works:

When this pin is floating or connected to 1/2 the supply voltage, DDR clocking is enabled.

edit: Oops, crosspost with FvM

 

[sharethl]

Just read the text completely: "When this pin is floating or connected to 1/2 the supply voltage"...

Oh, Thanks. I did read that one, but for page 31, it didn't say that, then I forgot.


Have a great holiday!