DS2165QN

Digital Signal Processor Dsp Overview

The DS2165Q is a dedicated digital-signal-processing (DSP) chip optimized for adaptive-differential pulse-code modulation (ADPCM) speech compression. It features dual fully independent channels capable of compressing or expanding 64kbps PCM voice to/from 32kbps, 24kbps, or 16kbps rates. The device includes a high-performance 10 MIPS DSP engine and two serial PCM interfaces supporting data rates from 256kHz to 4.096MHz. Input-to-output delay is less than 375µs. It operates on a single +5V supply with low-power CMOS technology and is available in a 28-pin PLCC package.

Digital Signal Processor Dsp Feature Summary

• Dual independent channel architecture supports two expansions, two compressions, or one expansion and one compression simultaneously.
• Supports CCITT G.721 (32kbps), ANSI T1.303 (24kbps), and proprietary 16kbps algorithms with on-the-fly switching capability.
• Hardware mode allows configuration without a host processor by mapping control bits to address pins, ideal for voice storage.
• Includes an onboard time-slot assigner-circuit (TSAC) and supports Channel Associated Signaling (CAS).

Digital Signal Processor Dsp Applications

• Voice storage systems requiring hardware-based configuration.
• Telecommunications equipment utilizing combo-codec devices.
• TDM backplane interconnects for PCM/ADPCM data processing.

Digital Signal Processor Dsp Procurement Notes

Verify the specific voltage variant required; the standard DS2165Q operates at +5V, while the DS2165QL variant supports 3V operation. Confirm package availability as the component is manufactured by Analog Devices Inc./Maxim Integrated. Ensure that system design accounts for the 28-pin PLCC footprint and associated soldering requirements specified in IPC/JEDEC standards.

Digital Signal Processor Dsp Selection Notes

Select the DS2165Q when software configuration via a serial port is feasible and dynamic algorithm switching is needed. Choose the hardware mode variant configuration if no external host controller is present, as it disables the serial port and uses pin strapping for setup. Ensure the master clock input is provided at 10MHz for proper DSP engine operation.

Digital Signal Processor Dsp Part Context

The DS2165Q belongs to the ADPCM processor family from Maxim Integrated, now part of Analog Devices. It is designed to interface directly with various codec/filter devices such as the TP305X, ETC505X, and MC1455XX series. The device provides a specialized solution for bandwidth optimization in voice transmission applications.

Digital Signal Processor Dsp Replacement Considerations

The DS2165QL is the 3V operation version of this component. Other generic codec/filter devices may be substituted for the recommended companion chips listed in the datasheet, but direct pin-for-pin replacements for the DSP itself are not explicitly documented in the provided source material.

Digital Signal Processor Dsp FAQ

How does the device handle Channel Associated Signaling (CAS)?

The DS2165Q supports CAS by automatically switching from the 32kbps algorithm to the 24kbps algorithm upon detecting a double-wide frame-sync pulse, allowing signaling data insertion into the LSB bit position.

What is the maximum input-to-output delay?

The total delay from PCM data sample capture to output is always less than 375µs across all three compression algorithms.

Can the compression algorithm be changed during operation?

Yes, in software mode, the user can switch between the three available algorithms on-the-fly without resetting or stopping the device, provided the control register is updated before the next input sample arrives.