TDA7521 Datasheet (ST Microelectronics)

TDA7521, Analog Front End

1.1 Clock source and generation The master clock to operate the device is 768 ×Fs (High Frequency mode, HFM) or 384 ×Fs (Low Frequency mode, LFM).

Fs=44.1KHz for CD applications.

In either case, the clock is generated by TDA7522: an internal low-jitter Charge-Pump PLL (CPPLL) and a Finite State Mach

TDA7521 Analog Front End PRODUCT PREVIEW 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 out

TDA7521 Features

* the functions ments an I2C-like protocol). Housed in a TQFP 44, 10 shown in figure below. TDA7521 uses the HF4CMOS technology and is supplied @5Vdc. May 1998 This is preliminary information on a new product now in development. Details are subject to change without notice. 1/11 TDA7521 Figure 1. T