ta2157f TOSHIBA Semiconductor CORPORATION, ta2157f Datasheet - Page 10

• Manufacturer Part Number: ta2157f
• Description: Digital Servo Head Amp For Cd System
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Test Methods
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)
(2)
Detection frequency
Detection time constant
voltage 1 (V
to the RFRPIN pin and specify a frequency whose amplitude is -3dB.
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.
Operating reference voltage 1 (V
Set to 0dB the maximum output amplitude of the RFRP pin in relation to the operating reference
Specify the time constant for peak and bottom detection frequencies when the square wave shown
(supplementary)
RFRP output amplitude: [V]
RFRPIN input: 1.2 Vpp
f = 5 kHz (SEL = HiZ or V
RFRP output
RFRPIN input: 1.2 Vpp
OP1RP
Detection frequency
) when the sine wave shown in the figure below is input via a capacitor (Cin > 1 mF)
OP1RP
CC
)
)
Specify by slew rate here
37 V/ms (SEL = HiZ or V
35
Specify by amplitude
equivalent to -3dB
10
RFRPIN input frequency [kHz]
CC
Set this amplitude
to 0dB
)
TA2157F/FN
2002-11-21