bS2132/Q FULL DATA SHEET AVAILABLE CALL 214-450-3836 DALLAS SEMICONDUCTOR DS2132/Q Digital Answering Machine Processor FEATURES @ Two high quality speech compression algorithms per- mit either 7 or 14 minutes of speech storage in a single 4 Mbit DRAM Economical three-wire data/controV/status port frees up microcontroller port pins. Detects and generates the 12 standard DTMF tones plus the A/B/C/D tones. * Detects CCITT T.30 FAX calling tone (1100 Hz) Generates musical tones which allow melodies-on- hold or customizable prompts @ Echo cancellation for improved DTMF receiver per- formance @ Precise signal level detection capability @ Record/Playback gain control 28-pin DIP or PLCC (DS2132Q) packages DESCRIPTION The DS2132 Digital Answering Machine Processor is a Digital Signal Processor (DSP) optimized for the com- pressiorvexpansion of PCM coded voice to/from an ex- tremely low bit rate. The DS2132 contains two ad- vanced speech compression algorithms that offer outstanding fidelity. The Standard Record/Playback al- gorithm compresses speech to 9.8Kbps and the Ex- tended Record/Playback algorithm compresses speech to 4.9Kbps. The DS2132 is ideal for embedded applications such as digital answering machines, voice mail, voice annuncia- tors, and any other device that needs to maximize PIN ASSIGNMENT no Oy vec RsT Qe PCMIN ano Oa CLK Gnd M4 FS nc U5 PCMOUT vec Os TRILIN vec 97 GND vec Js GND vec Yo 201) cpout vec (10 TRI_OUT vee J FS ano Q CLK weik G CDIN end NC DS2132 28-PIN DIP 600 MIL speech storage in a limited memory space. A simple three wire interface to the embedded microcontroller frees up valuable controller port pins for other uses and simplifies the software needed to transfer speech data, issue commands, and receive DTMF/energy levelsta- tus information. The DS2132 detects and generates all 16 DTMF tones and can also generate a wide variety of call progress tones. In addition, the DS2132 provides CCITT Rec. T.30 FAX calling tone detection which en- ables the answering machine to determine if the incom- ing callis a voice or FAX transmission. The energy level detector allows the microcontroller to perform call prog- ress detection and automatic gain control functions. 120691 7/1