LC78622NE

www.DataSheet4U.com Ordering number : EN6015 CMOS IC LC78622NE Compact Disc Player DSP Overview The LC78622NE is a CMOS IC that implements the signal processing and servo control required by compact disc players. At the same time as providing an EFM PLL circuit, a 1-bit D/A converter, and an analog low-pass filter the LC78622NE realizes an optimal costperformance tradeoff for low-end players by strictly limiting functionality to basic signal-processing and servo system functionality. The LC78622NE signal-processing system provides demodulation of the EFM signal from the pickup, de-interleaving, error detection and correction, and digital filters that can prove useful in reducing the cost of end products. The LC78622NE servo control system processes servo commands sent from the control microprocessor. The LC78622NE is an improved version of the LC78622E that adds 8× oversampling digital filters, three generalpurpose output ports (that also have specific shared functions) and the PCCL pin (pin 34). However, some handling of general-purpose ports differ from that of the LC78622E, therefore care must be taken.(Refer to pages 16 and 21). Functions Input signal processing: The LC78622NE takes an HF signal as input, digitizes (slices) that signal at a precise level, converts that signal to an EFM signal, and generates a PLL clock with an average frequency of 4.3218 MHz by comparing the phases of that signal and an internal VCO. Precise reference clock and n...