Digital Servo Single-Chip Processor for Use in CD Player

TC9490F/FA is a single-chip processor which incorporates the following functions: sync separation protection, interpolation, EFM decoder, error correction, microcontroller interface, digital equalizer for use in servo LSI, and servo control circuit.

TC9490F/FA also incorporates a 1-bit DA converter.

Combining TC9490F with digital servo head amp TA2147F enables very simple and completely adjustment-free CD player systems.

Features

• Capable of decoding the text data.

• Sync pattern detection, sync signal protection, and synchronization can be made correctly.

• Built-in EFM demodulation circuit and subcode demodulation.

• Capable of correcting dual C1 correction and quadruple C2 correction using the CIRC correction theoretical format.

• The TC9490F respond to variable playback system.

• Jitter absorbing capacity of ±6 frame.

• Built-in 16 k RAM.

• Built-in digital out circuit.

• Built-in L/R independent digital attenuator.

• Audio output responds to bilingual function.

• Output format for audio out can be selected 32fs, 48fs or 64fs modes.

• Read-timing-free subcode Q data and capable of synchronous output with audio data.

• Built-in data slicer and analog PLL (adjustment-free VCO).

• Capable of automatic adjustment function of focus and tracking servos for loop gain, offset and balance.

• Built-in RF gain automatic adjustment circuit.

• Built-in digital equalizer for phase compensation.

• Built-in RAM for digital equalizer for coefficient, and capable of variable pickup.

• Built-in focus and tracking servo control circuit.

• Search control corresponds to every mode and can realize high speed and stable search.

• Lens-kick and feed-kick are using speed controlled form.

• Built-in AFC and APC circuits for CLV servo of disc motor.

• Built-in anti-defect and anti-shock circuit.

• Built-in 8 times oversampling digital filter and 1-bit DA converter.

• Built-in analog filter for 1-bit DA converter.

• Built-in zero data detection output circuit.

• The TC9490F/FA capable of 4 times speed operation.

• Built-in microcontroller interface circuit.

• CMOS silicon structure and high speed, low power consumption.

• 64-pin flat package.