Analog Devices Inc./Maxim Integrated DS26334GA2+

Overview

DS26334GA2+ from Maxim Integrated is a 16-channel E1/T1/J1 short- and long-haul line interface unit (LIU) operating from a single 3.3V supply, supporting independent per-channel E1/T1/J1 selection, internal impedance matching without external resistors, and crystal-less jitter attenuation. It delivers -38dB T1 and -43dB E1 receive sensitivity with 2.5dB resolution signal level indication, and integrates dual BERT testers for diagnostics in telecom infrastructure.

For engineers reviewing the DS26334GA2+ datasheet, DS26334GA2+ pinout, DS26334GA2+ application, or DS26334GA2+ equivalent, key selection considerations include its 256-ball TE-CSBGA package, IEEE 1149.1 JTAG boundary scan support, G.772 nonintrusive monitoring capability, and dual-rail/single-rail software-selectable transmit/receive mode for flexible system integration.

Technical Context

The DS26334GA2+ implements a fully integrated LIU architecture with per-channel programmable front-end gain, adaptive clock recovery, and configurable line encoding (AMI/HDB3/B8ZS). Its on-chip synthesizer accepts master clock inputs at multiples of 1.544MHz or 2.048MHz and generates precise E1/T1/J1 frame clocks without external PLL components.

It supports both parallel (Intel/Motorola 8-bit) and 4-wire serial host interfaces, with interrupt-driven status reporting and register-level control of AIS generation/detection, loss-of-signal thresholds per ANSI T1.231, ITU-T G.775, and ETS 300 233, plus bipolar violation and excessive zero detection per channel.

Key Specifications

Pinout & Package

DS26334GA2+ is housed in a 256-ball TE-CSBGA (Thermally Enhanced Chip Scale Ball Grid Array) package with 1.0mm ball pitch, optimized for high-density telecom PCB layouts and thermal performance in multi-channel line cards.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar line interface unit applications.

Compared with DS26528+, DS26334GA2+ offers lower channel count but superior integration (single supply, internal termination, J1 support); compared with TLK2711IRCP, it provides complete L1 functionality-eliminating need for external line drivers, encoders, and clock cleaners in TDM line card designs.

Availability

DS26334GA2+ is available at Aetrix Electronics and suitable for T1 digital cross-connects, wireless base station backhaul, and E1/T1/J1 multiplexer applications requiring stable component supply, RoHS-compliant packaging, and long-term industrial temperature support (-40°C to +85°C).

Supply support for DS26334GA2+ 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 semiconductor company specializing in analog, mixed-signal, and high-reliability ICs for industrial, communications, and computing markets.

The DS26334GA2+ belongs to Maxim's telecom line interface product line, designed specifically for carrier-grade TDM infrastructure where integration, jitter performance, and multi-standard flexibility reduce system complexity and time-to-market.

FAQ

What is the operating temperature range for DS26334GA2+?

The DS26334GA2+ is rated for industrial operation from -40°C to +85°C. This extended temperature range ensures reliable performance in outdoor wireless base stations, central office line cards, and other telecom environments where ambient conditions exceed commercial limits. The DS26334GA2+ maintains full specification compliance-including receiver sensitivity, jitter attenuation, and BERT accuracy-across this entire range.

Does DS26334GA2+ support both E1 and T1 standards simultaneously?

Yes, DS26334GA2+ supports independent E1, T1, and J1 operation per channel. Each of the 16 LIUs can be configured individually via register settings for E1 (2.048Mbps), T1 (1.544Mbps), or J1 (1.544Mbps) framing, encoding (HDB3/B8ZS/AMI), and impedance (75Ω/120Ω). This enables mixed-standard line cards without hardware changes or firmware forks.

What clock frequencies does DS26334GA2+ accept for its master clock input?

DS26334GA2+ accepts a single master clock input at multiples of either 1.544MHz (for T1/J1) or 2.048MHz (for E1), including 8.192MHz, 16.384MHz, and 32.768MHz. Its internal prescaler PLL adapts the input to generate precise E1/T1/J1 frame clocks, eliminating need for separate crystal oscillators or external frequency synthesizers.

How does DS26334GA2+ handle loss-of-signal detection?

DS26334GA2+ implements dual-mode loss-of-signal (LOS) detection per channel: digital LOS per ANSI T1.231 and analog LOS per ITU-T G.775 and ETS 300 233. It monitors signal amplitude, bipolar violations, and excessive zeros, triggering configurable interrupts and status flags. Thresholds are programmable, and detection operates independently in short- and long-haul modes.

Is DS26334GA2+ pin-compatible with earlier DS26334 variants like DS26334G+?

Yes, DS26334GA2+ shares identical pinout, package (256-ball TE-CSBGA), and electrical interface with DS26334G+ and DS26334GN+. The 'A2' suffix denotes a specific wafer fabrication revision with updated errata handling, but all mechanical, thermal, and functional specifications-including register map, timing, and feature set-are fully compatible across these variants.