DS2165Q

DS2165Q 16/24/32kbps ADPCM Processor www.maxim-ic.com FEATURES § § Compresses/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 compressions - one expansion and one compression Interconnects directly to combo-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 DS2165Q 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 compression at three different rates. The chip can be programmed to compress (expand) 64kbps voice data down to (up from) either 32kbps, 24kbps, or 16kbps. The compression to 32kbps follows the algorithm specified by CCITT Recommendation G.721 (J...