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TDA7522 - Digital Servo & Decoder

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General Description

TDA7522 is a single chip processor consisting of Decoder, Servo and 1bit D/A for 4times CD-ROM / CDAudio.

Main concept of this IC is that it is based on embedded System Micro Controller which allows customer to develop system software very easily: just based on provided commands.

Further the microcontroller is fully customer dedicated in terms of both software and general purpose Port.

Overview

TDA7522 Digital Servo & Decoder PRODUCT PREVIEW s BUILT IN 8Bit MICROCONTROLLER (STANDARD ST7) with: – 24 KByte ROM available for ST7 & Servo-Audio DSP – 1024Byte RAM, including 128byte stack – 4KByte RAM for CD-Text memory (for 1block) – Built in R-W subcode buffer (Max.

144Byte 8packs) for CD-Text – 24 bit general I/O port (PoartA[7-0], PortB[7-0], PortC[7-0]) – One External Interrupt (16 IRQ encoder inside) – 16bit free running counter timer – 8bit 1ch general purpose A/D – I C bus I/F – Watch dog – Kenwood I/F 2 TQFP80 (14 x 14 x 1.40mm body) s s STAND-BY MODE (Stop all clocks and Shut down power of Peripheral (PON pin)) BUILT IN SERVO & AUDIO DIGITAL SIGNAL PROCESSOr (SAC-DSP) inclusive of: – 1024x19bit Program RAM – 512x16bit Coefficient RAM – 1024x20bit Data RAM – 128x6bit Decimation RAM – MAC: 16 bit (Coefficients) x 20 bit (data) multiplier with 38 bit adder – Instruction execution rate as high as 56MIPS s s BUILT IN PROGRAMMABLE CLOCK GENERATOR PLL PERIPHERALS for CD PLAYER APPLICATION – Data Acquisition, Erasure correction, CLV&CAV controller – Subcode decoder (CD-Text, CD-Graphic I/F) – Shock proof memory controller, Disturbance detector – Decimation filter s s ACTUATORS DRIVING MODE SELECTABLE between PWM or PDM MODE 256Fs / 384Fs (16.9344MHz) CLOCK INPUT.

May 1998 This is preliminary information on a new product now in development.

Key Features

  • s s s s s s s s s s s s s s 16Mbit DRAM I/F allows maximum 9 seconds shock proof Built-in 1bit Delta Sigma modulation for DAC Subcode P,Q and R-W decoding Error Correction is capable of Dual C1 and quadruple C2 erasure corrections Jitter absorbing capability: +/- 6 frames Automatic fine gain/balance/offset adjustment for tracking and focus servos Built-in Digital Silence detection Built-in EFM Demodulation/Sync Rear and Forward protection Soft audio mute Built-in Digital PLL with large capture.

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