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參數(shù)資料
| 型號： | LV1605M |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | 14 X 14 MM, QIP-64 |
| 文件頁數(shù)： | 24/24頁 |
| 文件大小： | 262K |
| 代理商： | LV1605M |
No. 7809-9/24
LV1605M
Focus Servo
The focus error signal is acquired by detecting the difference (B+D) – (A+C) of the (A+C) and (B+D) signals from
the pickup. This focus error signal is then passed through the VCA circuit, whose gain following is controlled by the
RF AGC circuit, and is output from FE (pin 21). The gain applied to the focus error signal is set by the value of the
resistor connected between FE (pin 21) and FE– (pin 22). When playing CD-RW discs, the input gain is increased
when the IC receives a signal from the DSP that sets RW (pin 44) low.
Offset cancellation is applied to the FE amplifier. This offset cancellation operation is provided to cancel the offset of
the IC's internal I-V amplifier and other circuits. Adjustment of this function is started by issuing a FOCUS-OFFSET
ADJUST START command and completes about 130ms later. The FOCUS-OFFSET ADJUST OFF command is
provided to return the IC's state to the state preceding the offset cancellation operation.
The FA amplifier is provided as a pickup phase compensation amplifier, and it's equalizer curve is set with an
external capacitor and resistor. This amplifier has a muting function, and mutes the output either when an F-SERVO
OFF command is issued in VCC ON mode or during an F-SEARCH operation. Issue either a LASER ON or an F-
SERVO ON command to turn focus search on.
The FH amplifier modifies the servo response characteristics on disc defect detection with SCI (pin 9).
The FD amplifier includes both a phase compensation circuit and a focus search signal synthesis function. A focus
search operation is started with the F-SEARCH command, a ramp waveform is generated using an internal clock, and
the operation completes in about 560ms. Focus is detected (focus zero cross detection) using the focus error signal
created from that waveform, and the focus servo is turned on. The amplitude of the ramp waveform is set by the value
of the resistor connected between FD (pin 16) and FD- (pin 17).
FSC (pin 58) is used to smooth the focus search ramp waveform; a capacitor for this purpose is connected between
FSC and REF.
FSS (pin 54) is the focus search mode switching pin; if FSS is shorted to VCC, the IC performs a + search relative to
the reference voltage, and if FSS is left open or shorted to ground, the IC performs a ± search.
FAJON (pin 53) is the focus offset adjustment mode switching pin, and is normally shorted to ground. Short this pin
to VCC to set the IC to operate in Sony coupler mode.
Tracking servo
The photodiode output current is input to E (pin 3) and F (pin 4). The input current is I-V converted, and the voltage
signal passes through first the balance adjustment VCA circuit and then the VCA circuit, whose gain following is
controlled by the RF AGC circuit, and is output from TE (pin 7). The value of the resistor connected between TE-
(pin 6) and TE (pin 7) sets the tracking error gain. When playing CD-RW discs, the input gain is increased when the
IC receives a signal from the DSP that sets RW (pin 44) low. Furthermore, in E/F balance mode, the gain is lowered
by 3 dB when the tracking signal peak value is over VREF + 0.6V.
Offset cancellation is applied to the TE amplifier. This offset cancellation operation completes in about 60ms. The
TRACK-OFFSET ADJUST OFF command is provided to return the IC's state to the state preceding the offset
cancellation operation.
The TH amplifier detects either the TGL signal from the DSP or the JP signal, and changes the servo response
characteristics according to the internally generated THLD signal and other signals. The tracking servo switches to
THLD mode internally on disc defect detection. This operation can be avoided by simply shorting DEF (pin 46) to
ground (the low level). A bandpass filter that extracts just the mechanical shock (skip detection) component from the
tracking error signal is formed externally at SCI (pin 9), and if injected, the gain is increased automatically when a
shock (skip) is detected.
The LV1605M includes an internal resistor so that a low-pass filter can be formed at the TA output (pin 11).
The TD amplifier is a circuit provided for servo loop phase compensation. Its characteristics are set with an external
RC circuit. This amplifier has a muting function, and the muting function operates either when VCC is turned on and
when a TRACK-SERVO OFF command has been issued. This muting function is released when a TRACK-SERVO
ON command is issued.
The TOFF amplifier immediately following TD (pin 13), functions to turn off the servo according to the TOFF signal
from the DSP.
The TO amplifier includes a function for synthesizing JP pulses, and the JP pulse is set with JP (pin 14). (THLD is
detected internally.)
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