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Analog Devices Inc./Maxim Integrated DS2149QN+
- Part No.:
- DS2149QN+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- -
- Datasheet:
-
DS2149QN+.pdf
- Description:
- IC LIU T1/J1 5V 28-PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,497
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Product details
Overview
DS2149QN+ from Maxim Integrated is a fully integrated T1 Line Interface Unit (LIU) for long-haul and short-haul twisted-pair applications, supporting ANSI T1.102/T1.403/T1.408 and AT&T 62411 standards, with crystal-less jitter attenuation, programmable line build-out (0dB to –22.5dB), and bipolar/NRZ interface capability - deployed in DSUs, CSUs, and T1 test equipment.
For engineers reviewing the DS2149QN+ datasheet, DS2149QN+ pinout, DS2149QN+ application, or DS2149QN+ equivalent, key selection considerations include jitter attenuator path placement (transmit/receive), receive sensitivity range (0dB to –36dB), five line build-out settings, B8ZS/NRZ encoding support, and hardware vs. serial control mode configuration.
Technical Context
The DS2149QN+ implements a dual-path analog front-end with independent transmit driver (TTIP/TRING) and receive equalizer (RTIP/RRING), supporting automatic gain adjustment across –18dB/–26dB/–36dB receive thresholds. Its crystal-less jitter attenuator uses a 1.544MHz MCLK reference and offers selectable 32-bit or 128-bit FIFO depth with 3Hz/6Hz bandwidth options.
Control is implemented via either hardware pin-strapping (MODE0/MODE1, JASEL, L0–L3) or serial interface (SCLK/SDI/SDO/CS), enabling standalone operation or host microcontroller integration. Diagnostic features include local/remote/analog loopbacks, QRSS pattern generation/detection, and in-band loop-up/down code handling per AT&T 62411.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 5.0V ±5% - powers both transmitter (TVDD) and core logic (VDD) blocks independently |
| Data Rate | 1.544Mbps T1 - matches standard DS1 framing; requires 1.544MHz MCLK for PLL and jitter attenuation |
| Receive Sensitivity | 0dB to –36dB - enables operation on 0.63mm (22AWG) cables up to 6k feet in length |
| Jitter Attenuator | Crystal-less, 32- or 128-bit FIFO - configurable for transmit or receive path; 3Hz/6Hz bandwidth selection |
| Line Build-Out | Five settings: 0dB, –7.5dB, –15dB, –22.5dB - supports DSX-1 and D4 short-haul, plus T1 long-haul configurations |
| CSU Filtering | Four levels: 0dB to –22.5dB - programmable attenuation for signal conditioning in channel service units |
| Interface Mode | Bipolar (AMI) or NRZ - selected via ENCENB/UNIENB bits; supports B8ZS encoding/decoding |
Pinout & Package
DS2149QN+ is housed in a 28-pin Plastic Leaded Chip Carrier (PLCC) package, rated for –40°C to +85°C operation. Pin functions differ between hardware and serial port modes; full dual-mode pin mapping is validated per Maxim's DS2149 datasheet Rev 113004.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MCLK (Pin 1) | Master Clock Input | 1.544MHz TTL-level reference for internal PLL and jitter attenuator - mandatory for device operation |
| TPOS/TNEG (Pins 3/4) | Transmit Data Inputs | Digital bipolar data sampled on falling edge of TCLK; used in hardware mode for direct line driving |
| RPOS/RNEG (Pins 6/7) | Receive Data Outputs | Bipolar data recovered from line; updated on rising/falling edge of RCLK depending on CLKE setting |
| JASEL (Pin 11) | Jitter Attenuator Path Select | Hardware-mode control: 0 = transmit path, 1 = receive path, float = disabled |
| L0–L3 (Pins 22/23/24/17) | Line Build-Out Control | 4-bit input selecting one of five output pulse shapes and receiver gain settings per Table 4-E |
| TTIP/TRING (Pins 13/16) | Transmit Analog Outputs | Differential line driver outputs connecting through step-up transformer to twisted-pair cable |
| RTIP/RRING (Pins 19/20) | Receive Analog Inputs | Differential inputs from 1:1 transformer; feed clock/data recovery and equalization circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Pin Compatibility | Pin-compatible with LevelOne LXT362 - enables drop-in replacement in existing T1 LIU designs without PCB revision |
| Jitter Attenuator Flexibility | Configurable placement (TX/RX path) and depth (32/128 bits) - allows system-level jitter budget allocation per signal chain requirements |
| Diagnostic Loopback Support | Local, remote, analog, and network loopbacks - provides comprehensive in-system validation without external test gear |
| In-Band Signaling Compliance | Generates/detects AT&T 62411 loop-up/down codes - enables interoperability with carrier-grade CSU/DSU infrastructure |
| Transmit Monitoring | Driver-fail, monitor-open, and loss-of-signal outputs - delivers real-time fault detection for field-deployed telecom equipment |
Applications
| Data Service Units (DSUs) | Channel Service Units (CSUs) |
|---|---|
Use Scenario: DSU in enterprise T1 termination point connecting PBX or router to telco line. IC Role / Device Role / Timing Role: Line interface unit providing physical layer T1 connectivity, clock recovery, and signal conditioning. Use Value: Enables reliable long-haul operation over 6k-ft 22AWG cable with auto-adjusting receive sensitivity and programmable line build-out. | Use Scenario: CSU in central office or customer premises for T1 line monitoring and protection. IC Role / Device Role / Timing Role: Physical-layer interface with CSU filtering, AIS detection, and loopback support for maintenance. Use Value: Four programmable CSU filter levels (0dB to –22.5dB) allow precise matching to legacy TDM network impedance profiles. |
| T1/E1 Test Equipment | Routers with T1 WAN Interfaces |
Use Scenario: Portable bit-error-rate tester (BERT) verifying T1 link integrity and jitter compliance. IC Role / Device Role / Timing Role: Programmable LIU generating QRSS patterns, injecting BPVs/LEs, and detecting in-band codes. Use Value: On-chip QRSS generator/detector and error insertion (INSBPV/INSLE) eliminate need for external pattern sources. | Use Scenario: Edge router with integrated T1 WAN port for business-class broadband backup or primary access. IC Role / Device Role / Timing Role: T1 line driver and receiver with jitter attenuation to maintain timing integrity across variable-length copper runs. Use Value: Crystal-less jitter attenuator reduces BOM cost and board space versus discrete PLL-based solutions while meeting T1.403 mask. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar T1 line interface unit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS2148QN+ | Single-ended transmit outputs (TOUT), no jitter attenuator - lacks crystal-less jitter attenuation and path flexibility | Suitable only for non-jitter-critical short-haul links where jitter tolerance >1.5UI is acceptable | Select DS2148QN+ only when jitter attenuation is unnecessary and cost reduction outweighs feature loss |
| MAX3005EUP+ | Integrated T1 transceiver with E1 support, 3.3V operation, and smaller 28-TSSOP package - not pin-compatible; different register map and control interface | Targeted at dual-standard (T1/E1) systems requiring lower voltage and higher integration density | Choose MAX3005EUP+ for new designs needing E1 compatibility or 3.3V supply; not a drop-in replacement |
Compared with DS2149QN+, DS2148QN+ omits jitter attenuation entirely - limiting use to legacy short-haul installations - while MAX3005EUP+ adds E1 support and 3.3V operation but requires full schematic and firmware redesign due to non-pin-compatibility and distinct register architecture.
Availability
DS2149QN+ is available at Aetrix Electronics and suitable for T1 line interface, channel bank, and telecom test equipment requiring stable component supply across industrial temperature ranges and long product lifecycles.
Supply support for DS2149QN+ 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 high-performance analog, mixed-signal, and power management ICs for communications, computing, and industrial markets.
The DS2149QN+ belongs to Maxim's T1/E1 line interface product line, designed specifically for robust, standards-compliant physical-layer connectivity in carrier-grade and enterprise telecom infrastructure.
FAQ
What is the operating temperature range for DS2149QN+?
The DS2149QN+ is rated for –40°C to +85°C operation, making it suitable for industrial and outdoor telecom equipment deployments where ambient conditions exceed commercial-grade limits. This extended range is confirmed in the Maxim DS2149 ordering information table and applies specifically to the "QN" suffix variant. DS2149QN+ maintains full compliance with ANSI T1.102 and AT&T 62411 across this entire temperature span.
Does DS2149QN+ require an external crystal?
No, DS2149QN+ does not require an external crystal. It implements a crystal-less jitter attenuator that operates from the 1.544MHz master clock (MCLK) applied to Pin 1. This eliminates crystal-related cost, board space, and aging drift concerns while maintaining jitter performance compliant with T1.403. The DS2149QN+ datasheet explicitly states "crystal-less jitter attenuator" as a core feature.
How is the jitter attenuator configured in DS2149QN+?
The jitter attenuator in DS2149QN+ is configured via hardware pin JASEL (Pin 11) in hardware mode or CR1 bits JASEL1/JASEL0 in software mode. It can be placed in either the transmit or receive path, and its depth (32-bit or 128-bit) and bandwidth (3Hz or 6Hz) are set via CR3 bits JA128 and JA6HZ. Configuration is validated in Tables 4-C and 4-E of the DS2149QN+ datasheet.
Can DS2149QN+ operate in both bipolar (AMI) and NRZ modes?
Yes, DS2149QN+ supports both bipolar (AMI) and NRZ interfaces. Mode selection is controlled by ENCENB and UNIENB bits in Control Register 1 (CR1), with specific combinations defined in Table 4-D of the datasheet. In NRZ mode, data is output on RPOS, and errors trigger pulses on RNEG - a behavior confirmed in the Signal Descriptions table for Pin 7 (RDATA).
Is DS2149QN+ pin-compatible with any other T1 LIUs?
Yes, DS2149QN+ is explicitly pin-compatible with the LevelOne LXT362, as stated in the Features section of the DS2149QN+ datasheet. This compatibility covers identical pin count, function mapping, and electrical characteristics in hardware mode, enabling direct substitution in legacy designs without PCB changes. No other pin-compatible alternatives are documented for DS2149QN+.
DS2149QN+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- -
- Interface:
- -
- Number of Circuits:
- -
- Voltage - Supply:
- -
- Current - Supply:
- -
- Power (Watts):
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
DS2149QN+ FAQ
1.How can I place an order for DS2149QN+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS2149QN+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for DS2149QN+ reliable?
The price and inventory of DS2149QN+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS2149QN+ is usually 5 days.
3.What payment methods are accepted for DS2149QN+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS2149QN+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS2149QN+?
DS2149QN+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS2149QN+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for DS2149QN+?
For technical support, including DS2149QN+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS2149QN+ requirements.
6.How does Aetrix verify that DS2149QN+ is sourced from the original manufacturer or authorized distributors?
All DS2149QN+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that DS2149QN+ meets industry standards.
7.What is the process for return or replacement of DS2149QN+?
All DS2149QN+ units undergo pre-shipment inspection (PSI). If there is an issue with DS2149QN+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The DS2149QN+ part is unused and in its original packaging.
Return procedure for DS2149QN+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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