DS2165, DS2165Q

16/24/32kbps ADPCM Processor

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Status Explanations for product status codes

Part Number Status Replacement Explanation
DS2165 This product is Not Recommended for New Designs. Some versions may be No Longer Available or being discontinued and subject to Last Time Buy, after which new orders can not be placed. See Ordering Information for details. DS2165
The DS2165 is only offered as the DS2165Q in the PLCC package. 
DS2165Q Active: In Production.  


The DS2165 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 (July 1986) and ANSI document T1.301 (April 1987). The compression to 24kbps follows ANSI document T1.303. The compression to 16kbps follows a proprietary algorithm developed by Dallas Semiconductor. The DS2165 can switch compression algorithms on-the-fly. This allows the user to make maximum use of the available bandwidth on a dynamic basis.

Data Sheet

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Key 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 375µs
  • 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
  • Backward-compatible with the DS2167 ADPCM processor chip
  • Single +5V supply; low-power CMOS technology
  • Available in 28-pin PLCC
  • 3V operation version is available (DS2165QL)

Key Specifications:

T/E Carrier & Packetized Products
Part Number Transmission Standard Functions Channels VSUPPLY
See Notes
DS2165  T1/E1/J1 ADPCM Processor 1 5 $14.73 @1k
See All T/E Carrier & Packetized Products (88)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


DS2165, DS2165Q: Block Diagram
Block Diagram

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Rev 1; 2002-07-11
This page last modified: 2009-10-22