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14 Constellation.2 Serial ATA Product Manual, Rev. B
Figure 3. Typical 5V/12V startup and operation current profile for 250GB models
3.8.2 Conducted noise
Noise is specified as a periodic and random distribution of frequencies covering a band from DC to 10 MHz.
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 8 kHz to 20 kHz.
= 250 mV pp from 20 kHz to 5 MHz.
Note. Equivalent resistance is calculated by dividing the nominal voltage by the typical RMS read/write
current.
3.8.3 Voltage tolerance
Voltage tolerance (including noise):
5V +10 / -7.5%
12V +10 / -7.5%