My Inquiry
My Account
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:2,264
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
DS2148TN from Maxim Integrated is a single-channel, 5V E1/T1/J1 Line Interface Unit (LIU) supporting both short- and long-haul trunks with software-selectable 75Ω/100Ω/120Ω receive termination, crystal-less jitter attenuation (32-bit or 128-bit FIFO), and full G.703/G.775/ANSI T1.403 compliance for telecom line interface applications.
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/hardware) control interface, E1/T1 waveform generation (AMI/HDB3/B8ZS), and integrated receive carrier loss (RCL) and transmit open-circuit detection.
Technical Context
The DS2148TN implements a fully integrated analog front-end with transformer-coupled RTIP/RRING inputs and TTIP/TRING outputs, supporting E1 (2.048MHz) and T1 (1.544MHz) master clock options. Its PLL-based clock/data recovery engine feeds a configurable jitter attenuator MUX placed in either transmit or receive path, enabling precise timing alignment per G.823.
It integrates programmable line build-out (LBO) for E1 (75Ω/120Ω) and T1 (DSX-1/CSU), real-time PRBS generation/detection (2¹⁵–1 or 2²⁰–1), and hardware-mode loopback controls (local, remote, analog, dual) - all accessible via 8-bit parallel (Intel/Motorola), serial SPI-like, or dedicated hardware pins (BIS0/BIS1/HRST).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 5.0V ±5% - fixed single-supply operation; VSM pin must be tied high. |
| Operating Temperature | –40°C to +85°C - industrial-grade thermal range suitable for outdoor telecom cabinets. |
| Interface Modes | 8-bit parallel (muxed/non-muxed, Intel/Motorola), serial (3-wire), or hardware mode - no external controller required in hardware mode. |
| Jitter Attenuation | Crystal-less 32-bit or 128-bit FIFO - eliminates need for external VCXO; accepts 2.048MHz (E1/T1) or 1.544MHz (T1 only) MCLK. |
| Encoding Support | AMI/HDB3 (E1), AMI/B8ZS (T1), J1 - full protocol compliance per ITU G.703, ANSI T1.403-1999, and AT&T TR 62411. |
| Line Build-Out | E1: 0dB/–7.5dB/–15dB/–22.5dB selectable; T1: DSX-1 and CSU LBOs - enables direct connection to legacy telco infrastructure without external amplifiers. |
| Alarm Detection | G.775-compliant Receive Carrier Loss (RCL), Blue (AIS), and Loss of Transmit Clock (LOTC) - provides standardized fault signaling for network management systems. |
Pinout & Package
DS2148TN is housed in a 44-pin Thin Quad Flat Package (TQFP), 10mm × 10mm, 0.8mm pitch, RoHS-compliant (lead-free). Thermal pad exposed on bottom for enhanced heat dissipation in high-density line card designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RTIP / RRING | Analog Receive Inputs | Differential transformer-coupled inputs for E1/T1 line signals; support internal 75Ω/100Ω/120Ω termination selection via register. |
| TTIP / TRING | Analog Transmit Outputs | Differential line driver outputs; drive CEPT 30/ISDN-PRI (E1) or DSX-1/CSU (T1) lines directly via step-up transformer. |
| RPOS / RNEG | Bipolar/NRZ Data Outputs | Recovered data outputs synchronized to RCLK; NRZ mode enabled via CCR1.6; RNEG pulses on error in NRZ mode. |
| TPOS / TNEG | Bipolar/NRZ Data Inputs | Transmit data inputs sampled on TCLK edge (configurable rising/falling); require external framing or channelized data source. |
| RCLK / TCLK / BPCLK | Clock Signals | RCLK = recovered line clock; TCLK = transmit clock source (MCLK or RCLK); BPCLK = synthesized backplane clock (2.048/4.096/8.192/16.384MHz). |
| MCLK | Master Clock Input | 2.048MHz (±50ppm) primary reference; optional 1.544MHz for T1-only operation - drives PLL, jitter attenuator, and timing recovery. |
| CS / RD / WR / A0–A4 / D0–D7 | Parallel Control Interface | 8-bit multiplexed or non-multiplexed bus; supports Intel (RD/WR/ALE) or Motorola (DS/RW) timing; PBTS selects bus type. |
| SDI / SDO / SCLK / CS | Serial Control Interface | 3-wire SPI-compatible port; allows configuration without address/data bus overhead - ideal for microcontroller-constrained designs. |
| HRST / BIS0 / BIS1 / TEST | Hardware Mode Controls | Enable standalone operation: HRST resets registers; BIS0/BIS1 select interface mode; TEST tri-states all I/O for board-level test. |
| RCL/LOTC / INT / PBEO | Status & Diagnostic Outputs | RCL/LOTC flags carrier loss or missing TCLK; INT asserts on alarm/error events; PBEO pulses on PRBS bit errors for real-time BER monitoring. |
Key Features
| Feature | Design Value |
|---|---|
| Software-selectable receive termination | Eliminates external resistor networks; supports 75Ω (E1 coax), 100Ω (Cat5), and 120Ω (E1 twisted pair) without PCB redesign. |
| Crystal-less jitter attenuator | Reduces BOM count and layout complexity by removing VCXO; maintains <1.5UI peak-to-peak jitter at output per G.823. |
| Integrated line build-out (LBO) | Enables direct connection to legacy E1/T1 infrastructure - no external amplifiers or passive pads needed for 0dB to –22.5dB gain adjustment. |
| Multi-standard encoding/decoding | Single device supports global deployments: HDB3 for E1 (ETSI), B8ZS for T1 (ANSI), and AMI for J1 - reduces inventory SKUs. |
| Hardware mode operation | Permits configuration-free startup using dedicated pins (BIS0/BIS1/HRST); ideal for field-replaceable units requiring zero firmware initialization. |
Applications
| Telecom Access Node | Enterprise T1/E1 Gateway |
|---|---|
Use Scenario: Aggregating multiple PRI circuits in DSLAM or MSAN chassis for last-mile broadband delivery. IC Role / Device Role / Timing Role: Primary LIU handling physical layer E1/T1 signal conditioning, clock recovery, and line driving for up to 30 voice channels per link. Use Value: Enables carrier-grade uptime with G.775 RCL detection, in-band loop code support (1–16 bits), and PRBS-based BER validation during provisioning. | Use Scenario: Converting T1/E1 WAN links to Ethernet/IP in enterprise branch routers or SD-WAN appliances. IC Role / Device Role / Timing Role: Physical-layer bridge between legacy telco lines and packet-switched backplane; provides recovered RCLK for synchronous Ethernet timing distribution. Use Value: Delivers deterministic jitter performance (<1.5UI) and synthesizes 16.384MHz BPCLK for downstream PHYs - eliminating need for separate timing ICs. |
| Industrial SCADA Telemetry | Test & Measurement Equipment |
Use Scenario: Remote monitoring of utility substations over leased T1 lines in harsh environments (-40°C to +85°C). IC Role / Device Role / Timing Role: Robust line interface with open-circuit detection, transmit current limiting (50mA RMS), and high-Z TTIP/TRING for safe hot-swap maintenance. Use Value: Ensures continuous telemetry integrity via AIS alarm generation, blue alarm detection, and hardware-mode loopbacks for remote diagnostics. | Use Scenario: Embedded in protocol analyzers or bit-error-rate testers for E1/T1 physical layer validation. IC Role / Device Role / Timing Role: Self-contained LIU with PRBS pattern generation/detection, dual-loopback modes (remote/local/analog), and error counter registers (ECR1/ECR2). Use Value: Provides real-time, pin-accessible BER metrics via PBEO pulse output and register-readable error counts - accelerates lab characterization. |
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 temperature grade; identical pinout and register map. | Restricted to commercial-temperature environments (e.g., indoor enterprise gear). | Select DS2148T only if ambient operating temperature remains within 0°C–70°C and industrial qualification is not required. |
| DS21Q48N | Quad-channel version in 144-ball CSBGA; shares same core architecture but adds channel synchronization and shared MCLK distribution. | Designed for multi-port line cards (e.g., 4×T1/E1 aggregation); requires different PCB layout and thermal management. | Choose DS21Q48N when scaling beyond single-link density; not a drop-in replacement due to package, pin count, and power delivery differences. |
Compared with DS2148T and DS21Q48N, the DS2148TN uniquely balances industrial temperature range, single-channel simplicity, and 44-pin TQFP manufacturability - making it optimal for cost-sensitive, space-constrained telecom edge devices where reliability across extended thermal conditions is mandatory.
Availability
DS2148TN is available at Aetrix Electronics and suitable for telecom access nodes, enterprise T1/E1 gateways, industrial SCADA telemetry, and test & measurement equipment requiring stable component supply across extended temperature ranges and long product lifecycles.
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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and RF solutions for industrial, communications, and computing markets.
The DS2148TN belongs to Maxim's legacy Line Interface Unit (LIU) product line, engineered specifically for carrier-class E1/T1/J1 physical layer interfacing in telecom infrastructure - emphasizing jitter control, protocol compliance, and robust fault detection.
FAQ
What is the maximum cable length supported by DS2148TN in E1 mode?
The DS2148TN supports E1 operation over 2.5km on 0.63mm (22AWG) copper cable, achieved through programmable receive sensitivity (0dB to –43dB) and integrated line build-out (LBO) that compensates for signal attenuation without external amplification. This capability is validated per ITU G.703 and ETSI ETS 300 166 specifications.
Does DS2148TN support both E1 and T1 standards simultaneously?
No, DS2148TN operates in either E1 or T1 mode, selected via the ETS bit (CCR1.7) in the control register. It cannot process both standards concurrently. However, the same device can be reconfigured in-system via software to switch between E1 (2.048MHz MCLK) and T1 (1.544MHz or 2.048MHz MCLK) operation without hardware change.
Can DS2148TN generate a backplane clock synchronized to the recovered line clock?
Yes, DS2148TN synthesizes a BPCLK output (16.384MHz, 8.192MHz, 4.096MHz, or 2.048MHz) phase-locked to RCLK using an internal frequency multiplier. The BPCLK is programmable via CCR5.7 and CCR5.6 and serves as a low-jitter system clock for downstream logic, eliminating need for external clock generators in line-card designs.
Is external termination required for DS2148TN's receive inputs?
No, DS2148TN includes internal software-selectable termination for 75Ω, 100Ω, or 120Ω applications - configured via register writes or hardware mode pins. External termination is optional and used only when higher precision or custom impedance matching is needed beyond the internal options.
What diagnostic capabilities does DS2148TN provide for field maintenance?
DS2148TN offers comprehensive diagnostics including local/remote/analog/dual loopbacks, PRBS generation/detection (2¹⁵–1 or 2²⁰–1), in-band loop code generation/detection (1–16 bits), real-time error counting (ECR1/ECR2), and PBEO pulse output for bit-error indication - all accessible via parallel, serial, or hardware interface without host processor intervention.
DS2148TN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 44-TQFP
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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.
DS2148TN Tags
-
LMC567CMX/NOPB
Texas Instruments
-
LM567CMX/NOPB
Texas Instruments
-
LM567CM/NOPB
Texas Instruments
-
VSC8531XMW-02
Microchip Technology
-
VSC8531XMW-05
Microchip Technology
-
GPY115C0VI
MaxLinear, Inc.
-
SI32185-A-FMR
Skyworks Solutions Inc.
-
VSC8541XMV-05
Microchip Technology
-
SI32178-B-FM1R
Skyworks Solutions Inc.
-
GPY215C0VI
MaxLinear, Inc.
-
CPC7514ZTR
Littelfuse Inc.
-
VSC8502XML-03
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
