TA2157F/FN

2002-11-21

10

Note: Due to the relation with RFRP detection frequency, use feed search (track cross speed) at 80 kHz or less.

1.

Test method for RFRP detection frequency characteristic and detection time constant

(1)

Detection frequency

Set to 0dB the maximum output amplitude of the RFRP pin in relation to the operating reference

to the RFRPIN pin and specify a frequency whose amplitude is -3dB.

(2)

Detection time constant

Specify the time constant for peak and bottom detection frequencies when the square wave shown

in the figure below is input via a capacitor (Cin > 1 mF) to the RFRPIN pin at the slew rate of the

RFRP pin output sawtooth wave.

RFRPIN input: 1.2 Vpp

f

RFRP output

Specify by slew rate here

37 V/ms (SEL

RFRPIN input: 1.2 Vpp

RFRP output amplitude: [V]

35

Specify by amplitude

equivalent to

-3dB

Set this amplitude

to 0dB

RFRPIN input frequency [kHz]

Detection frequency