My Inquiry
My Account
Analog Devices Inc./Maxim Integrated DS2148TA2
- Part No.:
- DS2148TA2
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 44-TQFP
- Datasheet:
-
DS2148TA2.pdf
- Description:
- 5V E1/T1/J1 LINE INTERFACE
- Quantity:
- Payment:
- Shipping:
Inventory:619
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
DS2148TA2 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 AMI/HDB3/B8ZS encoding/decoding - deployed in telecom access equipment for E1/T1 line card designs.
For engineers reviewing the DS2148TA2 datasheet, DS2148TA2 pinout, DS2148TA2 application, or DS2148TA2 equivalent, key selection criteria include its 5V-only operation, 49-ball CSBGA (7mm × 7mm) package, dual-mode (parallel/serial/hardware) control interface, G.703/G.775 compliance, and support for both E1 (2.048MHz) and T1 (1.544MHz) master clock inputs.
Technical Context
The DS2148TA2 integrates full analog front-end circuitry including transformer-coupled RTIP/RRING inputs with programmable receive sensitivity (–43dBm for E1, –36dBm for T1), active filtering for nonlinear loss compensation, and bipolar/NRZ data I/O (RPOS/RNEG, TPOS/TNEG). Its PLL-based clock recovery locks to incoming AMI/HDB3/B8ZS waveforms while synthesizing RCLK and BPCLK outputs.
It implements configurable line build-out (LBO) per G.703: E1 supports 75Ω/120Ω waveshaping; T1 supports DSX-1 (0dB, –7.5dB, –15dB, –22.5dB) and CSU LBOs. Jitter attenuation is placed either in transmit or receive path via MUX, with 2.048MHz MCLK as primary reference (1.544MHz optional for T1).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 5.0V ±5% - requires single-rail 5V supply; VSM pin must be tied high for valid operation. |
| Data Rates | E1: 2.048Mbps; T1: 1.544Mbps - supports full-rate line interface with frame alignment and alarm detection per ITU-T G.704/G.775. |
| Receive Sensitivity | E1: –43dBm; T1: –36dBm - enables reliable operation over 2.5km E1 cable (22AWG) and 6k ft T1 cable. |
| Jitter Attenuation | 32-bit or 128-bit FIFO depth - selectable crystal-less jitter filtering using only MCLK; no external VCXO required. |
| Encoding Support | AMI, HDB3 (E1), B8ZS (T1) - full encode/decode with built-in pattern detection, BPV/CV/EXZ error reporting. |
| Output Clocks | RCLK (recovered line clock), BPCLK (16.384/8.192/4.096/2.048MHz) - synthesized from RCLK for backplane timing distribution. |
| Alarm Detection | G.775-compliant RCL (Receive Carrier Loss), AIS (Blue Alarm), LOF, LOS - real-time status reporting via Status Register and INT* output. |
Pinout & Package
DS2148TA2 uses a 49-ball CSBGA package (7mm × 7mm, 0.5mm pitch), RoHS-compliant and lead-free. Pin functions are mode-dependent (parallel/serial/hardware); all I/O pins are assigned per Table 2-7 in the datasheet, with dedicated analog (RTIP/RRING, TTIP/TRING), clock (MCLK, RCLK, TCLK, BPCLK), data (RPOS/RNEG, TPOS/TNEG), and control (CS*, INT*, HRST*, BIS0/BIS1) terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RTIP / RRING | Analog Receive Inputs | Transformer-coupled differential inputs for E1/T1 waveform recovery; support internal 75Ω/100Ω/120Ω termination selection. |
| TTIP / TRING | Analog Transmit Outputs | Line driver outputs driving step-up transformer; generate G.703-compliant E1 waveshapes or DSX-1/CSU T1 LBOs. |
| RPOS / RNEG | Bipolar/NRZ Receive Data | Edge-aligned (rising/falling RCLK) bipolar data output; NRZ mode enabled via CCR1.6 for simplified digital interface. |
| TPOS / TNEG | Bipolar Transmit Data Input | Sampled on TCLK edge (configurable polarity); fed into HDB3/B8ZS encoder before line driver stage. |
| MCLK | Master Clock Input | 2.048MHz (±50ppm) TTL-level input for clock recovery and jitter attenuator; 1.544MHz allowed for T1-only use. |
| RCLK | Recovered Line Clock Output | Buffered, low-jitter clock synchronized to incoming line signal; used as timing reference for host system and BPCLK synthesis. |
| BPCLK | Backplane Clock Output | Synthesized from RCLK at 2×, 4×, or 8× rate (16.384/8.192/4.096/2.048MHz); supports system-level synchronization without external clock generator. |
| INT* | Interrupt Output | Active-low open-drain flag for alarm events (RCL, AIS, LOF, PRBS error) - reduces polling overhead in embedded host controllers. |
| HRST* | Hardware Reset Input | Asynchronous active-low reset that clears all registers to default state (all zeros); eliminates need for software initialization sequence. |
| BIS0 / BIS1 | Bus Interface Select | Configures control interface mode: parallel (muxed/non-muxed Intel/Motorola), serial (SPI-like), or hardware (pin-strapped diagnostics). |
Key Features
| Feature | Design Value |
|---|---|
| Crystal-less jitter attenuation | Eliminates external VCXO and loop filter components; 32/128-bit FIFO depth configurable per application jitter tolerance requirements. |
| Software-selectable receive termination | Reduces BOM count and board space by enabling 75Ω/100Ω/120Ω matching via register write instead of discrete resistor networks. |
| G.703-compliant line drivers | Meets E1 (75Ω/120Ω) and T1 (DSX-1/CSU) pulse template specs without external shaping circuits or calibration. |
| Multi-standard encoding/decoding | Single device supports E1 (HDB3), T1 (B8ZS), and legacy AMI - simplifies global product variants and inventory management. |
| Integrated diagnostics | On-chip PRBS generation/detection, loopbacks (local/remote/analog), and 16-bit in-band loop code handling reduce test time and external test equipment dependency. |
Applications
| E1 Channel Bank | T1 Multiplexer |
|---|---|
|
Use Scenario: Aggregating 30 E1 channels into STM-1 or IP transport links in metro access nodes. IC Role / Device Role / Timing Role: Line interface unit providing clock recovery, HDB3 decode, and G.703-compliant analog drive for CEPT 30-channel framing. Use Value: Enables direct transformer-coupled connection to legacy E1 lines with –43dBm sensitivity, eliminating external amplifiers for 2.5km reach. |
Use Scenario: Building modular T1 service cards for carrier-class DSLAMs and business gateway platforms. IC Role / Device Role / Timing Role: T1 LIU performing B8ZS encoding, DSX-1 line build-out, and RCL/AIS alarm monitoring per ANSI T1.403. Use Value: Supports both short-haul (DSX-1) and long-haul (CSU) configurations via register-controlled LBO settings, reducing SKU count. |
| Network Interface Unit (NIU) | Remote Terminal Unit (RTU) |
|
Use Scenario: Deploying compact, fanless NIUs in street cabinets for fiber-to-the-curb (FTTC) E1 backhaul. IC Role / Device Role / Timing Role: Primary line interface handling clock/data recovery, jitter attenuation, and backplane clock (BPCLK) synthesis for downstream logic. Use Value: BPCLK output at 16.384MHz or 8.192MHz replaces separate clock generator IC, lowering power and component count. |
Use Scenario: Industrial SCADA systems requiring T1 connectivity to central control centers over leased lines. IC Role / Device Role / Timing Role: Robust T1 interface with G.775 RCL detection, PRBS diagnostics, and hardware-mode loopback for field validation. Use Value: Hardware-mode operation (BIS1/BIS0 = 11) allows rapid commissioning without host firmware - critical for remote site deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar line interface unit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS21Q48N | Quad-channel version in 144-ball CSBGA; shares identical per-channel architecture and register map with DS2148TA2. | Targets multi-port line cards where density > cost; requires PCB redesign due to larger footprint and different pinout. | Select when scaling from single- to four-port E1/T1 line cards without changing firmware or driver logic. |
| MAX3267CPE+ | 3.3V-only LIU; supports E1 only; lacks T1/B8ZS support and CSU line build-out capability. | Restricted to E1-only infrastructure upgrades where voltage migration to 3.3V is feasible and T1 compatibility is unnecessary. | Choose only for greenfield E1-only deployments with strict 3.3V supply constraints and no T1 interoperability requirement. |
Compared with DS21Q48N and MAX3267CPE+, the DS2148TA2 uniquely balances single-channel flexibility, 5V operation, full E1/T1/J1 feature parity, and 49-ball CSBGA compactness - making it optimal for cost-sensitive, mixed-standard line cards where pin compatibility and software reuse across generations matter.
Availability
DS2148TA2 is available at Aetrix Electronics and suitable for telecom access equipment, carrier-grade multiplexers, and industrial remote terminal units requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for DS2148TA2 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 high-reliability interface solutions for communications, industrial, and automotive markets.
The DS2148 product line delivers fully integrated E1/T1/J1 line interface units targeting telecom infrastructure equipment where signal integrity, standards compliance, and reduced external component count are critical design goals.
FAQ
What is the operating temperature range for the DS2148TA2?
The DS2148TA2 is rated for commercial temperature operation from 0°C to +70°C. This range is specified in the Ordering Information table and aligns with the 'T' suffix in the part number. It is not rated for extended industrial temperatures (–40°C to +85°C), which apply to DS2148TN and DS2148GN variants. Thermal characteristics including θJA are documented in Section 9.1 of the datasheet.
Does the DS2148TA2 support both E1 and T1 standards simultaneously?
No - the DS2148TA2 operates in either E1 or T1 mode, selected via the ETS bit (CCR1.7) in the control register. When ETS = 0, it configures for E1 (2.048MHz, HDB3, 75Ω/120Ω); when ETS = 1, it configures for T1 (1.544MHz, B8ZS, DSX-1/CSU LBO). The same DS2148TA2 silicon supports both, but runtime reconfiguration requires register update and may involve clock source switching.
What package type does the DS2148TA2 use, and is it RoHS-compliant?
The DS2148TA2 uses a 49-ball CSBGA package measuring 7mm × 7mm with 0.5mm pitch. Per the Ordering Information table and revision history note #10 (011206), the '+' suffix confirms it is lead-free and RoHS-compliant. Mechanical dimensions and soldering profiles are detailed in Section 11.2 of the datasheet.
Can the DS2148TA2 generate a backplane clock synchronized to the recovered line clock?
Yes - the DS2148TA2 synthesizes BPCLK from RCLK at rates of 16.384MHz, 8.192MHz, 4.096MHz, or 2.048MHz, selectable via CCR5.7 and CCR5.6. This output is phase-locked to the recovered line clock (RCLK), enabling deterministic timing distribution across a backplane without external PLLs or clock buffers - a key feature confirmed in Sections 1.1 and 7.4.
How does the DS2148TA2 handle receive carrier loss detection?
The DS2148TA2 implements G.775-compliant Receive Carrier Loss (RCL) detection. When enabled (CCR2.7 = 0), it monitors RTIP/RRING signal amplitude and asserts RCL/LOTC high upon sustained loss of valid signal. The condition is reported in Status Register bit SR.7 and triggers the INT* output. Thresholds and response timing are fixed per G.775 and do not require calibration.
DS2148TA2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 44-TQFP
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Line Interface Unit (LIU)
- Interface:
- E1, J1, T1
- Number of Circuits:
- 1
- Voltage - Supply:
- 4.75V ~ 5.25V
- Current - Supply:
- 125mA
- Power (Watts):
- -
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-TQFP (10x10)
DS2148TA2 FAQ
1.How can I place an order for DS2148TA2 through Aetrix?
Please submit a Request for Quotation (RFQ) for DS2148TA2 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 DS2148TA2 reliable?
The price and inventory of DS2148TA2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS2148TA2 is usually 5 days.
3.What payment methods are accepted for DS2148TA2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS2148TA2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS2148TA2?
DS2148TA2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS2148TA2 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 DS2148TA2?
For technical support, including DS2148TA2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS2148TA2 requirements.
6.How does Aetrix verify that DS2148TA2 is sourced from the original manufacturer or authorized distributors?
All DS2148TA2 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 DS2148TA2 meets industry standards.
7.What is the process for return or replacement of DS2148TA2?
All DS2148TA2 units undergo pre-shipment inspection (PSI). If there is an issue with DS2148TA2, 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 DS2148TA2 part is unused and in its original packaging.
Return procedure for DS2148TA2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DS2148TA2 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…
