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SM9403BM Datasheet(PDF) 7 Page - Nippon Precision Circuits Inc

No. de pieza SM9403BM
Descripción Electrónicos  DVDRAM Servo-amplifier LSI
Download  18 Pages
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Fabricante Electrónico  NPC [Nippon Precision Circuits Inc]
Página de inicio  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM9403BM Datasheet(HTML) 7 Page - Nippon Precision Circuits Inc

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SM9403BM
NIPPON PRECISION CIRCUITS—7
DPD Error Signal Detector Characteristics (DPDA/DPDB/DPDC/DPDD
→ TRP)
VCC = 5V ± 5%, GND = 0V, Ta = 0 to 70°C
P arameter1
1. The tracking error signal TRE is positive with respect to VREF2 if the (DPDA + DPDC) signal phase difference is leading.
The detected phase difference is the difference between the point when one internal comparator output changes (from CMA and CMB both HIGH or
both LOW) until the second output changes before the first changes again. The phase difference is conver ted to a voltage and sampled for output.
Other signals are held constant in the output stage when a phase difference is detected.
Condition
Rating
Unit
min
typ
m a x
D P D A/DPDB/DPDC/DPDD input voltage
range
VREF2 reference
−0.55
+ 1
V
D P D A/DPDB/DPDC/DPDD input
impedance
1––
M
Signal gain relative accuracy
Gain relative to DPDA , DPDB, DPDC,
DPDD inputs
±0.17
d B
Equalizer gain
1MHz setting
DG2 =LOW
1.2
1.6
2.3
dB
DG2 = HIGH
1.8
2.2
2.9
5MHz setting
DG2 =LOW
5.5
6.1
6.6
DG2 = HIGH
6.1
6.7
7.2
Equalizer frequency response
P eak gain frequency (EQE = HIGH)
3.75
5.0
6.25
MHz
−3dB frequency (EQE = LOW)
1 1
2 2
3 3
Equalizer frequency response relative
accuracy
fpeak, (A + C) vs. (B + D)
±1.5
%
A C coupling time circuit
−3dB frequency
Time constant 1
DG2 = LOW
5 6
8 4
109
kHz
Time constant 2
DG2 = HIGH
17
24
32
A C coupling time constant relative
accuracy
−3dB frequency, (A + C) vs. (B + D)
±2
%
Delay control range
See table 4.
See table 4.
ns
Phase difference detector minimum time
DG1 = DG2 = LOW
2
ns
Phase difference detector maximum time
DG1 = DG2 = HIGH
1
µs
Phase difference detector minimu m
repeat time
Input pulse interval
1 2 0
ns
Phase difference to voltage conversion
coefficient
DG1 = DG2 = LOW
See table 5.
typ ± 20%
mV/ns
Phase difference to voltage conversion
coefficient change accuracy
See table 8.
±1
d B
Phase difference output offset voltage
VREF2 reference
±0.1
V
Phase difference output offset voltage
temperature drift
VREF2 reference
±570
µV/
°C
DEFECT signal response time
1
µ s
DPD enable response time
DPE flag
2
µs
Abnor mal waveform TRP droop
characteristic
V OUT = V REF2 ± 200mV, VREF2 reference
0.1
%/µs
TRP output voltage range
VREF2 reference
−1.25
0
+1.25
V
TRP output signal frequency response
−3dB frequency
5 0 0
k H z


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