TP3094 COMBO® Quad PCM Codec/Filter

General 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 Alaw 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 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

• Wide operating temperature range -40°C to 85°C

Absolute Maximum Ratings

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications.

V_CC to DGND 7V

Voltage at any digital inputs or outputs V_CC +0.3V to DGND -0.3V

Voltage at any analog inputs or outputs V_CC +0.3V to AGND-0.3V

Storage temperature range -65℃ to +150℃

Lead temperature(Soldering, 10 Sec) 260℃

ESD (human body model) 2000 V

Latch-up immunity on any pin 200 mA

Connection Diagram

Simplified Block Diagram

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