ADS1217: current that Dout output (pin 36) can be drained (IOL)

Alberto Rubio Lara

Other Parts Discussed in Thread: ADS1217

We use the ADS1217IPFB ADC in many of our products.

Now we have found a problem with the speed of propagation of the optocouplers we use to isolate the SPI bus to communicate with the microcontroller.

We have read the datasheet of ADS1217IPFB but we don't find a data. We need to know which is the current that Dout output (pin 36) can be drained (IOL) .We only know the VOL value when the current draw is 1 mA (page 5 of the datasheet).

We would need to know which is the typical value and maximum drain current of the output Dout. Now we use 3mA, but we would like to use 10mA. Is it possible?

over 12 years ago

0 Bob Benjamin over 12 years ago

TI__Guru** 113765 points

Hi Alberto,

Welcome to the forum! As the ADS1217 is typically connected to a CMOS device, the typical connection is designed for the 1mA load. Unfortunately I cannot give a maximum output current drive as this is not tested on the device at final test. The device should be able to sink/source 10mA and more, but the output VOH and VOL will change with the increased current. This will vary over temperature and the supply voltage used.

Best regards,

Bob B

0 Alberto Rubio Lara over 12 years ago in reply to Bob Benjamin

Prodigy 20 points

Thanks, Bob B.

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ADS1217: current that Dout output (pin 36) can be drained (IOL)