ADS4149 power down modes

Hi Fred,

I took some measurements today. The clock outputs power down in the "global power down" and "output buffer disabled" modes. "Standby" appears to not totally shutdown the clock, however the waveform becomes distorted. The frequency and DC level stay the same. The currents for each mode is broken out below. Measurements were taken on the ADS41B49. You can ignore the 3.3 V supply if you're using a ADS4149. All measurements taken at 250 MSPS, LVDS interface, no digital functions enabled, no input signal.

Normal:
1.8 V Analog: 99 mA
1.8 V Digital: 54 mA
3.3 V Buffer: ~ 105 mA

Global Power Down:
1.8 V Analog: less than 1 mA
1.8 V Digital: less than 1 mA
3.3 V Buffer: ~ 80 mA

Standby:
1.8 V Analog: 49 mA
1.8 V Digital: 53 mA
3.3 V Buffer: ~80 mA

Output Buffer Disabled:
1.8 V Analog: 99 mA
1.8 V Digital: 25 mA
3.3 V Buffer: ~ 105 mA

Normal, no clock:
1.8 V Analog: 14 mA
1.8 V Digital: 34 mA
3.3 V Buffer: 80 mA

Standby and output buffer disabled do not disable the internal clocks. Global power down does.

Regards,
Matt Guibord