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TDA7521, TDA7522, TDA7524

Table of contents:
Info of TDA7521
Info of TDA7522
Info of TDA7524

TDA7521, TDA7522, TDA7524 Selling Leads, Datasheet

MFG:PHILIPS Package Cooled:DIP D/C:N/A?

TDA7521, TDA7522, TDA7524 Datasheet download

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Part Number: TDA7521

MFG: PHILIPS

Package Cooled: DIP

D/C: N/A?

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TDA7521 General Description

TDA7521 is a BiCMOS analog front end for CD applications. Four input signals (AC*, BD*, E* and F*), coming from the pick-up (whose laser diode is driven and controlled by the device itself), are preamplified by a programmable voltage-to-voltage or current-tovoltage stage, depending on the used pick-up. The output signals from the preamplifier stage (AC, BD, E, F and HF, a radio frequency signal obtained by combining the photo-detector outputs as A+B+C+D) are fed to an 8-bit HF ADC (for HF, which carries encoded audio data) and a 6-bit Servo ADC (for AC, BD, E and F, used for focusing, tracking the laser beam and controlling revolution speed). All these signals are digitized, multiplexed, synchronized with the external clock (768*Fs or 394*Fs, Fs=44.1KHz) and fed to the digital counterpart in one only digital stream (AC/HF/ BD/HF/E/HF/F/HF). Two stereo DACs convert the input bitstreams from TDA7522.

All the clock signals (for ADCs and DACs) are generated by a low-jitter PLL-based clock manager. All TDA7521's analog preprocessing is controlled by TDA7522 bymeans of an UART interface (which implements an I2C-like protocol). Housed in a TQFP 44, 10*10mm package, TDA7521 features the functions shown in figure below.

TDA7521 uses the HF4CMOS technology and is supplied @5Vdc.

TDA7522 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.

By combination of ST Analog front-end IC (TDA7521), all CD functions including Shock Proof Memory Controller and CD-Text function can be realized.
The TDA7522 portfolio is constituted by three different versions:
'development': which gives the possibility to have at disposal the complete sw development environment, by means of a dedicated package
'in field development': standard package but with selection of program memory: on chip RAM, on chip ROM. The program RAM is fully patchable through the standard IIC interface, giving the possibility of sw changing while chip is working in the real environment.
'production': standard package, but with software permanently stored in the on chip ROM.

TDA7522 Features

`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
    I²C bus I/F
    Watch dog
    Kenwood I/F
` 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
` 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
` ACTUATORS DRIVING MODE SELECTABLE between PWM or PDM MODE
` 256Fs / 384Fs (16.9344MHz) CLOCK INPUT.

TDA7522 Connection Diagram

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