User Manual

Constellation.2 Serial ATA Product Manual, Rev. G 18
Figure 3. Typical 5V/12V startup and operation current profile for 250GB models
2.8.2 Conducted noise
Noise is specified as a periodic and random distribution of frequencies covering a defined frequency. Maximum
allowed noise values given below are peak-to-peak measurements and apply at the drive power connector.
• +5v = 250 mV pp from 100 Hz to 20 MHz.
• +12v = 450 mV pp from 100 Hz to 100 KHz.
= 250 mV pp from 100 KHz to 20 MHz
= 150 mV pp from 20 MHz to 80 MHz
Note. Equivalent resistance is calculated by dividing the nominal voltage by the typical RMS read/write current.
2.8.3 Voltage tolerance
Voltage tolerance (including noise):
5V
± 5%
12V
± 5%