Analog Devices Inc./Maxim Integrated DS2167

Overview

DS2167 from Maxim Integrated is a dedicated CMOS ADPCM processor IC optimized for voice compression in TDM telephony systems. It supports the July 1986 T1Y1 and CCITT G.721 recommendations, delivers 10 MIPS processing, operates at 5 V, reduces voice bandwidth from 64 kbps to 32 kbps, and interfaces directly with µ-law/A-law codecs - enabling voice mail and channel bank applications.

For engineers reviewing the DS2167 datasheet, DS2167 pinout, DS2167 application, or DS2167 equivalent, this page provides verified functional identity, hardware/software mode behavior, dual-channel PCM timing control, timeslot programmability, and low-power idle operation - all critical for T1/E1 infrastructure design and legacy telecom system upgrades.

Technical Context

The DS2167 implements a fixed-function 10 MIPS DSP engine dedicated to ADPCM compression and expansion, with independent X- and Y-side PCM interfaces supporting 1.544 MHz (T1), 2.048 MHz (E1), and 4.096 MHz data rates. Each interface features user-programmable input/output timeslots, µ-law or A-law format selection, and bypass/idle modes.

It operates in two mutually exclusive configuration modes: software mode (SPS = high) uses a 3-wire serial port (CS/SCLK/SDI) to configure registers across up to 64 devices on one bus; hardware mode (SPS = low) maps control bits directly to address pins (A0–A5), eliminating host dependency and defaulting to timeslot 0 for both channels.

Key Specifications

Pinout & Package

DS2167 is available in 24-pin DIP (600 mil) and 28-pin PLCC packages. The 24-pin DIP variant is explicitly documented in the datasheet as the base configuration for DS2167; pin functions are validated per Table 1 and Figures 1–2.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ADPCM processor applications.

Compared with DS2168, DS2167 ensures compatibility with post-1986 T1Y1 deployments and offers faster wake-up from standby (200 ms vs. hardware reset required); versus MC3418, DS2167 delivers dual-channel independence, hardware-mode autonomy, and programmable timeslot routing essential for multi-channel TDM systems.

Availability

DS2167 is available at Aetrix Electronics and suitable for voice mail systems, T1 channel banks, legacy PBX upgrades, secure voice terminals, and telecom infrastructure requiring stable component supply with long-term lifecycle support.

Supply support for DS2167 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) is a U.S.-based semiconductor company specializing in precision analog, mixed-signal, and high-reliability ICs for communications, industrial, and computing markets.

The DS2167 belongs to Maxim's legacy telecom DSP product line, designed specifically for ADPCM-based voice bandwidth reduction in TDM telephony infrastructure - targeting voice mail, channel banks, and digital loop carrier systems.

FAQ

What standards does DS2167 support, and how does it differ from DS2168?

The DS2167 supports the July 1986 T1Y1 recommendations and the corresponding updated CCITT G.721 standard - distinct from the earlier "old" G.721 version supported by DS2168. This makes DS2167 incompatible with pre-1986 ADPCM implementations. DS2167 also powers up from standby in 200 ms without reset, whereas DS2168 requires a hardware reset. Both share identical pinout and packaging but differ in algorithm implementation and wake-up behavior.

Does DS2167 require an external microcontroller to operate?

No - DS2167 supports hardware mode when SPS is tied low, enabling stand-alone operation without any host processor. In this mode, control bits (CP/EX, µ/A, IPD) are mapped directly to address pins A0–A5, and both channels default to timeslot 0. This configuration is ideal for voice mail systems and other fixed-function applications where minimal external logic is preferred.

What are the power consumption characteristics of DS2167 in active and idle states?

DS2167 draws 30 mA under active operation (1.544 MHz PCM clocks, 10 MHz MCLK, outputs open). When both X and Y channels are placed in idle mode (IPD = 1), supply current drops to 1 mA - a 30× reduction. The DS2167 automatically wakes within 200 ms after either channel exits idle, making it suitable for burst-mode voice applications requiring rapid power-state transitions.

Can DS2167 interface directly with common µ-law and A-law codecs?

Yes - DS2167 interconnects directly with standard µ-law or A-law codec/filter devices such as the TP3054, TP3057, MC14550, and TCM29CXX. Its PCM interfaces accept standard 8-bit µ-law or A-law samples synchronized to FSX/FSY and CLKX/CLKY, eliminating the need for level-shifting or protocol translation logic in typical telephony designs.

What package options are available for DS2167, and are they pin-compatible?

DS2167 is offered in 24-pin DIP (600 mil) and 28-pin PLCC packages. The 24-pin DIP is the baseline configuration documented across all functional and timing specifications. The 28-pin PLCC (DS2167Q) adds NC pins and reassigns some terminal locations - they are not pin-compatible. Designers must select the appropriate package variant early, as PCB layout and signal routing differ between the two.