( File format: PDF, 186 Kbytes )
COMBO Quad PCM Codec/Filter
National Semiconductor
Description
The TP3094 is a monolithic PCM Codec and Filter device implemented using a digital signal processing architecture. It provides four voice channels, combining transmit bandpass and receive low pass channel filters with companding A-law or m-law PCM encoders and decoders. The device is fabricated using National's advanced CMOS process. The device includes anti-aliasing filters and sigma-delta converters dedicated to each channel, and by a common signal processing unit which performs all the remaining filtering and processing for the four channels. The TP3094 QuadCOMBO includes a flexible PCM digital interface, which allows the device to be connected to PCM busses of different formats. It can also be connected with other TP3094 devices in a cascade fashion, for a system with up to 128 POTS interfaces (when a 2.048MHz PCM bus is used).
Features
• Handles four voice channels
• Complete Codec and Filter system including:
• Transmit and receive channel filters
• A-law or m-law companding encoder/decoder
• Power down mode for low power consumption
• Compatible to standard time division multiplexed PCM bus
• 8 bit mode, frame signal from external reference
• 32 bit mode, internal TSA, with consecutive TS
• Up to 128 channels (32 devices) can be cascaded
• Programmable functions (common for all 4 channels):
• A-law or m-law
• Single MCLK clock, automatically selectable from 8.192MHz, 4.096MHz, 2.048MHz and 1.536/1.544MHz
• Digital and Analog loopback test modes
• Designed for CCITT and LSSGR applications
• Single +5V power supply
• 44 lead PLCC surface mount package
• Maximize line card circuit density
• Use in Central Office, Loop Carrier, and PBX equipment subscriber line and trunk cards
As the hyperlinked contents/websites are those of third parties, we cannot vouch for their accuracy or legitimacy.
Hot Articles
Most Popular Articles
Search EE Times India
Max's Cool Beans
Strange modes of transport and other "stuff"
Someone just pointed me at a YouTube video that claims to show the world's first e-powered multicopter flight...
