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TDA7521 データシート(PDF) 1 Page - STMicroelectronics |
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TDA7521 データシート(HTML) 1 Page - STMicroelectronics |
1 / 11 page 1/11 PRODUCT PREVIEW This is preliminary information on a new product now in development. Details are subject to change without notice. TDA7521 Analog Front End TDA7521 is a BiCMOS analog front end for CD appli- cations. 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-to- voltage 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 com- bining 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 con- trolling revolution speed). All these signals are digi- tized, 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 in- put 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 by means of an UART interface (which imple- ments 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. May 1998 TQFP44 (10 x 10 x 1.40 mm body) |
同様の部品番号 - TDA7521 |
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同様の説明 - TDA7521 |
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