MC14SM5567| Datasheet

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MC14SM5567/D Rev. 0, 4/2002 MC14SM5567 PCM Codec-Filter

Freescale Semiconductor, Inc.

The MC14SM5567 is a per channel PCM Codec-Filter, designed to operate in both synchronous and asynchronous applications. This device performs the voice digitization and reconstruction as well as the band limiting and smoothing required for (A-Law) PCM systems.

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This device has an input operational amplifier whose output is the input to the encoder section. The encoder section immediately low-pass filters the analog signal with an RC filter to eliminate very-high-frequency noise from being modulated down to the pass band by the switched capacitor filter. From the active R-C filter, the analog signal is converted to a differential signal. From this point, all analog signal processing is done differentially. This allows processing of an analog signal that is twice the amplitude allowed by a single-ended design, which reduces the significance of noise to both the inverted and non-inverted signal paths. Another advantage of this differential design is that noise injected via the power supplies is a common mode signal that is cancelled when the inverted and non-inverted signals are recombined. This dramatically improves the power supply rejection ratio. After the differential converter, a differential switched capacitor filter band passes the analog signal from 200 Hz to
3400 Hz before the signal is digitized by the differential compressing A/D converter. The decoder accepts PCM data and expands it using a differential D/A converter. The output of the D/A is low-pass filtered at 3400 Hz and sinX/X compensated by a differential switched capacitor filter. The signal is then filtered by an active R-C filter to eliminate the out-of-band energy of the switched capacitor filter. This device accepts both long- and short-frame industry standard clock formats. Fully Differential Analog Circuit Design for Lowest Noise Extended Temperature Range of 40 to 85 C Transmit Band-Pass and Receive Low-Pass Filters On-Chip Active R-C Pre-Filtering and Post-Filtering A-Law Companding On-Chip Precision Voltage Reference (2.5 V) Typical Power Dissipation of 40 mW, Power Down of 1.0 mW at 5 V Push-Pull Power Drivers with External Gain Adjust Analog Loopback 20-Pin SOG Package

DW SUFFIX SOG PACKAGE CASE 751D