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Analog Devices Inc./Maxim Integrated DS2148TN+
- Part No.:
- DS2148TN+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 44-TQFP
- Datasheet:
-
DS2148TN+.pdf
- Description:
- IC TELECOM INTERFACE 44TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,755
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Product details
Overview
DS2148TN+ from Maxim Integrated is a single-channel, 5V E1/T1/J1 Line Interface Unit (LIU) supporting long- and short-haul trunks with software-selectable 75Ω/100Ω/120Ω receive termination, crystal-less jitter attenuation (32-/128-bit FIFO), and AMI/HDB3/B8ZS encoding/decoding - deployed in telecom access equipment for E1/T1 line card interfaces.
For engineers reviewing the DS2148TN+ datasheet, DS2148TN+ pinout, DS2148TN+ application, or DS2148TN+ equivalent, key selection criteria include its 44-pin TQFP package, 5V-only operation, dual-mode parallel/serial control interface, G.703/G.775 compliance, and support for both E1 (2.048MHz) and T1 (1.544MHz) master clock inputs.
Technical Context
The DS2148TN+ integrates full analog front-end circuitry including transformer-coupled RTIP/RRING receivers with automatic sensitivity adjustment (–43dBm E1, –36dBm T1), programmable line build-out (0dB to –22.5dB), and bipolar/NRZ data I/O on TPOS/TNEG and RPOS/RNEG. Its PLL-based clock recovery locks to incoming AMI/HDB3 or AMI/B8ZS waveforms while generating buffered RCLK and synthesizing BPCLK outputs at 2.048/4.096/8.192/16.384MHz.
Control is implemented via 8-bit parallel (muxed/non-muxed Intel/Motorola), serial (SPI-like SDI/SDO/SCLK), or hardware mode (BIS0/BIS1), with diagnostic features including PRBS generation/detection (215–1 or 220–1), in-band loop code handling (1–16 bits), and multiple loopback types (local, remote, analog, dual).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 5.0V ±5% - requires dedicated 5V rail; no 3V operation supported. |
| Data Rates | E1: 2.048Mbps, T1: 1.544Mbps - supports both standards with same hardware. |
| Jitter Attenuation | 32-bit or 128-bit FIFO depth - selectable placement in Tx or Rx path for precise jitter filtering. |
| Receive Sensitivity | E1: –43dBm, T1: –36dBm - enables operation over 2.5km E1 or 6k ft T1 copper links. |
| Line Build-Out | E1: 0dB/–7.5dB/–15dB/–22.5dB; T1: DSX-1/CSU options - configurable via CCR4 register. |
| Encoding Standards | AMI, HDB3 (E1), B8ZS (T1) - fully compliant with ANSI T1.403-1999, ITU G.703/G.775. |
| Interface Modes | 8-bit parallel (Intel/Motorola), serial (3-wire), or hardware mode - flexible host integration. |
Pinout & Package
DS2148TN+ is housed in a 44-pin Thin Quad Flat Package (TQFP), 10mm × 10mm, 0.8mm pitch, RoHS-compliant and lead-free. Thermal pad exposed on underside per package drawing 56-G4012-001.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RTIP / RRING | Analog Receive Inputs | Transformer-coupled differential inputs for E1/T1 waveform recovery; support internal 75/100/120Ω termination. |
| TTIP / TRING | Analog Transmit Outputs | Differential line driver outputs; drive CEPT 30/ISDN-PRI (E1) or DSX-1/CSU (T1) lines via step-up transformer. |
| RPOS / RNEG | Recovered Data Outputs | Bipolar or NRZ data outputs synchronized to RCLK; RNEG pulses on error in NRZ mode. |
| TPOS / TNEG | Transmit Data Inputs | Differential inputs for formatted data; sampled on TCLK edge per CCR2.1 setting. |
| RCLK | Recovered Clock Output | Buffered line-recovered clock; used as reference for jitter attenuator and backplane timing. |
| BPCLK | Synthesized Backplane Clock | Programmable output at 2.048/4.096/8.192/16.384MHz - derived from RCLK for system synchronization. |
| MCLK | Master Clock Input | 2.048MHz (E1/T1) or optional 1.544MHz (T1 only); ±50ppm tolerance required for jitter performance. |
| INT* | Interrupt Output | Active-low open-drain flag for alarm conditions (AIS, RCL, LOS) per Status Register bits. |
| HRST* | Hardware Reset Input | Active-low asynchronous reset; initializes all registers to default state (all zeros). |
| BIS0 / BIS1 | Bus Interface Select | Configures port mode: parallel (00/01), serial (10), or hardware (11); determines pin function mapping. |
Key Features
| Feature | Design Value |
|---|---|
| Crystal-less Jitter Attenuation | 32-/128-bit FIFO eliminates need for external crystal oscillator while meeting G.823 jitter specs. |
| Software-Selectable Termination | 75Ω/100Ω/120Ω receive termination configured via register - avoids board-level resistor changes. |
| G.703 Waveform Compliance | Generates E1 75Ω/120Ω and T1 DSX-1/CSU line build-outs meeting ITU-T G.703 pulse templates. |
| Multi-Standard Encoding | Single device handles AMI/HDB3 (E1) and AMI/B8ZS (T1) encoding/decoding - reduces BOM count. |
| Comprehensive Diagnostics | PRBS gen/detect, in-band loop codes (1–16 bits), four loopback modes, and error counters enable field validation. |
Applications
| DSLAM Line Cards | Enterprise PBX Gateways |
|---|---|
Use Scenario: Aggregating multiple E1/T1 lines into broadband DSL access nodes. IC Role / Device Role / Timing Role: Line Interface Unit providing physical layer framing, clock recovery, and jitter attenuation for upstream/downstream traffic. Use Value: Enables stable 2.048/1.544MHz clock distribution and compliant G.703 waveform generation across 44-pin TQFP footprint. | Use Scenario: Connecting legacy TDM voice infrastructure to IP-based call control systems. IC Role / Device Role / Timing Role: Physical-layer bridge converting bipolar T1/E1 signals to NRZ data for DSP or FPGA processing. Use Value: Supports both AMI/B8ZS and AMI/HDB3 decoding with programmable receive sensitivity up to –36dBm (T1). |
| Wireless Backhaul Radios | Industrial TDM Multiplexers |
Use Scenario: Providing E1 connectivity between microwave radio units and base station controllers. IC Role / Device Role / Timing Role: Full-duplex LIU managing line build-out, carrier loss detection (G.775), and AIS alarm generation. Use Value: Integrates RCL/LOTC output, blue alarm detection, and high-Z TTIP/TRING for safe hot-swap and fault isolation. | Use Scenario: Consolidating multiple serial T1/E1 streams in SCADA or utility automation systems. IC Role / Device Role / Timing Role: Synchronization source via BPCLK output and jitter-cleaned RCLK for multi-channel time-division multiplexing. Use Value: Delivers 16.384MHz/8.192MHz backplane clocks synthesized from recovered line timing - eliminates external clock generators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar line interface unit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS2148T+ | Same silicon, 0°C to +70°C industrial temp grade vs. DS2148TN+'s –40°C to +85°C extended range. | Suitable for commercial indoor equipment; not rated for outdoor cabinet or automotive environments. | Select DS2148T+ only if ambient operating temperature remains within 0°C–70°C and RoHS compliance is confirmed. |
| DS21Q48N | Quad-channel version in 144-ball CSBGA; shares register map and core architecture but differs in pinout, thermal design, and channel count. | Designed for high-density line cards requiring four independent E1/T1 ports - not a drop-in replacement. | Choose DS21Q48N when scaling from single to quad LIU without redesigning firmware logic or control interface. |
Compared with DS2148TN+, DS2148T+ offers identical functionality at lower temperature rating and cost, while DS21Q48N provides channel density at the expense of package size and layout complexity - making DS2148TN+ optimal for space-constrained, wide-temperature single-port designs.
Availability
DS2148TN+ is available at Aetrix Electronics and suitable for telecom infrastructure, wireless backhaul, and industrial TDM equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for DS2148TN+ 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 precision analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.
The DS2148 product line delivers integrated E1/T1/J1 Line Interface Units targeting telecom line cards, access gateways, and TDM infrastructure where signal integrity, jitter control, and multi-standard compliance are critical.
FAQ
What voltage supply does the DS2148TN+ require?
The DS2148TN+ operates exclusively from a 5.0V ±5% supply - it is not compatible with 3.3V or dual-supply configurations. VSM must be tied high to enable 5V mode, and both VDD pins (21 and 36) require local decoupling. This 5V-only design ensures robust noise immunity for E1/T1 analog signaling paths.
Does the DS2148TN+ support both E1 and T1 standards simultaneously?
Yes, the DS2148TN+ supports both E1 (2.048Mbps) and T1 (1.544Mbps) standards in a single device. Mode selection is controlled by the ETS bit (CCR1.7); when set, the device configures for E1 (HDB3, 75/120Ω), and when cleared, for T1 (B8ZS, DSX-1/CSU). MCLK can be 2.048MHz (both) or 1.544MHz (T1 only).
How is jitter attenuation implemented in the DS2148TN+?
The DS2148TN+ implements crystal-less jitter attenuation using a configurable 32-bit or 128-bit FIFO placed in either the transmit or receive data path. It synchronizes to the recovered RCLK and meets ITU-T G.823 jitter transfer/tolerance requirements without external VCXO or PLL components - reducing bill-of-materials and board area.
What are the supported control interfaces for the DS2148TN+?
The DS2148TN+ supports three control modes: 8-bit parallel (multiplexed/non-multiplexed Intel or Motorola timing), 3-wire serial (SDI/SDO/SCLK), and hardware mode (BIS0/BIS1 = 11). Pin functions change based on BIS0/BIS1 settings, and PBTS selects Intel vs. Motorola bus timing in parallel mode - enabling flexible host processor integration.
Can the DS2148TN+ generate and detect in-band loop codes?
Yes, the DS2148TN+ generates and detects 1- to 16-bit in-band loop codes, including CSU-specific codes. Loop code length is programmable via CCR3.4–CCR3.0 (transmit) and monitored in RIR1.7–RIR1.0 (receive). This capability supports standardized maintenance loops for field diagnostics and remote line testing per ANSI T1.403 and ITU G.704.
DS2148TN+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 44-TQFP
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Line Interface Unit (LIU)
- Interface:
- LIU
- Number of Circuits:
- 1
- Voltage - Supply:
- 4.75V ~ 5.25V
- Current - Supply:
- 95mA
- Power (Watts):
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-TQFP (10x10)
DS2148TN+ FAQ
1.How can I place an order for DS2148TN+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS2148TN+ 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 DS2148TN+ reliable?
The price and inventory of DS2148TN+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS2148TN+ is usually 5 days.
3.What payment methods are accepted for DS2148TN+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS2148TN+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS2148TN+?
DS2148TN+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS2148TN+ 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 DS2148TN+?
For technical support, including DS2148TN+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS2148TN+ requirements.
6.How does Aetrix verify that DS2148TN+ is sourced from the original manufacturer or authorized distributors?
All DS2148TN+ 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 DS2148TN+ meets industry standards.
7.What is the process for return or replacement of DS2148TN+?
All DS2148TN+ units undergo pre-shipment inspection (PSI). If there is an issue with DS2148TN+, 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 DS2148TN+ part is unused and in its original packaging.
Return procedure for DS2148TN+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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