DS2165Q Datasheet | Dallas Semiconducotr

FEATURES - - presses/expands 64kbps PCM voice to/from either 32kbps, 24kbps, or 16kbps Dual fully independent channel architecture; device can be programmed to perform either: - two expansions - two pressions - one expansion and one pression Interconnects directly to bo-codec devices Input to output delay is less than 375ms Simple serial port used to configure the device On-board time-slot assigner-circuit (TSAC) function allows data to be input/output at various time slots Supports Channel Associated Signaling Each channel can be independently idled or placed into bypass Available hardware mode requires no host processor; ideal for voice storage applications Single +5V supply; low-power CMOS technology Available in 28-pin PLCC 3V operation version is available (DS2165QL) PIN ASSIGNMENT (Top View) TM1 TM0 RST NC VDD YIN CLKY NC A0 A1 A2 A3 A4 A5 5 6 7 8 9 10 11 12 13 14 15 16 17 18 4 3 2 1 28 27 26 25 24 23 22 21 20 19 - - - - - - - - - - FSY YOUT CS SDI SCLK XOUT NC DESCRIPTION The DS2165Q ADPCM processor chip is a dedicated digital-signal-processing (DSP) chip that has been optimized to perform adaptive-differential pulse-code modulation (ADPCM) speech pression at three different rates. The chip can be programmed to press (expand) 64kbps voice data down to (up from) either 32kbps, 24kbps, or 16kbps. The pression to 32kbps follows the algorithm specified by CCITT Remendation G.721 (July 1986) and ANSI document T1.301 (April 1987). The pression to 24kbps follows ANSI document T1.303. The pression to 16kbps follows a proprietary algorithm developed by Dallas Semiconductor. The DS2165Q can switch pression algorithms on-the-fly. This allows the user to make maximum use of the available bandwidth on a dynamic basis. Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device may be simultaneously available through various sales channels. For information about device errata,...