Conducted Noise; Figure 1 Typical 5V Startup And Operation Current Profile; Figure 2 Typical 12V Startup And Operation Current Profile - Seagate ST3250820ACE Product Manual

2.8.1.1 Typical current profile
Figure 1 Typical 5V startup and operation current profile
Figure 2 Typical 12V startup and operation current profile
2.8.2

Conducted noise

Input noise ripple is measured at the host system power supply across an equivalent 80-ohm resistive load on
the +12 volt line or an equivalent 15-ohm resistive load on the +5 volt line.
• Using 12-volt power, the drive is expected to operate with a maximum of 120 mV peak-to-peak square-wave
injected noise at up to 10 MHz.
• Using 5-volt power, the drive is expected to operate with a maximum of 100 mV peak-to-peak square-wave
injected noise at up to 10 MHz.
Note. Equivalent resistance is calculated by dividing the nominal voltage by the typical RMS read/write
current.
12 DB35.3 Series PATA Product Manual, Rev. C