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Microchip Technology LE87100NQC
- Part No.:
- LE87100NQC
- Manufacturer:
- Microchip Technology
- Category:
- Telecom
- Package:
- -
- Datasheet:
-
LE87100NQC.pdf
- Description:
- IC TELECOM INTERFACE 100MHZ
- Quantity:
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- Shipping:
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Product details
Overview
LE87100NQC from Microsemi (now Microchip) is a single-channel, high-voltage line interface IC for DSL transceivers, featuring 14-bit DAC resolution, 125 MSPS sampling rate, and integrated 5th-order low-pass filter. It supports ADSL2+ and VDSL2 standards in central office line card applications.
For engineers reviewing the LE87100NQC datasheet, LE87100NQC pinout, LE87100NQC application, or LE87100NQC equivalent, key selection factors include its 14-bit DAC resolution, 125 MSPS update rate, integrated analog filter, ±12 V analog supply tolerance, and compliance with ITU-T G.992.5 and G.993.2.
Technical Context
The LE87100NQC integrates a 14-bit current-steering DAC, programmable gain amplifier, and fifth-order elliptic low-pass filter optimized for DSL line driving. Its digital interface supports parallel 14-bit data input with separate clock and frame sync signals.
It operates from ±12 V analog supplies and a 3.3 V digital supply, with output swing up to ±10 V into 100 Ω. The device includes internal reference buffers and supports dynamic range of 82 dBc SFDR at 1 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DAC Resolution | 14-bit - enables precise line signal synthesis for multi-tone DSL modulation schemes |
| Max Sampling Rate | 125 MSPS - supports full VDSL2 bandwidth up to 30 MHz |
| Analog Supply | ±12 V - powers high-voltage line driver stage for long-loop DSL reach |
| Digital Supply | 3.3 V - interfaces directly with standard FPGA or DSP I/O banks |
| Integrated Filter | 5th-order elliptic LPF - eliminates aliasing without external components |
| SFDR @ 1 MHz | 82 dBc - ensures clean spectral output for compliant ADSL2+/VDSL2 transmission |
Pinout & Package
LE87100NQC is housed in a 64-pin QFN package (9 mm × 9 mm, 0.5 mm pitch) with exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D[13:0] | Parallel DAC Data Input | 14-bit LSB-first data bus synchronized to CLK |
| CLK | Sampling Clock Input | Accepts up to 125 MHz CMOS clock for DAC update timing |
| FSYNC | Frame Sync Input | Indicates start of new sample word; used for multi-device synchronization |
| VOUTP/VOUTN | Differential Analog Output | High-voltage differential pair driving transformer primary (±10 V swing) |
| REFIO | Reference Buffer I/O | Provides buffered 2.5 V reference or accepts external reference |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5th-order elliptic filter | Eliminates need for external reconstruction filter, reducing BOM count and board area |
| ±12 V analog supply support | Enables >10 Vpp differential output swing for extended DSL loop reach |
| 14-bit DAC with 82 dBc SFDR | Meets spectral mask requirements for VDSL2 profile 30a/35b without post-filtering |
| Parallel 14-bit interface with FSYNC | Supports deterministic latency and multi-channel synchronization in line card designs |
Applications
| DSL Central Office Line Card | VDSL2 Vectoring System |
|---|---|
Use Scenario: High-density DSLAM line cards serving multiple subscriber lines in telecom central offices. IC Role / Device Role / Timing Role: Primary line driver DAC generating analog transmit signals for ADSL2+/VDSL2 modulation. Use Value: Integrated filter and ±12 V operation enable compact, high-performance line card designs meeting ITU-T G.993.2. | Use Scenario: VDSL2 vectoring systems requiring precise multi-channel phase alignment and low crosstalk. IC Role / Device Role / Timing Role: Synchronized DAC channel in vectoring-capable line driver subsystem. Use Value: FSYNC input and deterministic latency allow sub-ns inter-channel timing alignment for effective crosstalk cancellation. |
| ADSL2+ Remote Terminal | Multi-Standard DSL Test Equipment |
Use Scenario: Remote DSL distribution points supporting legacy ADSL2+ services over extended copper loops. IC Role / Device Role / Timing Role: High-dynamic-range DAC providing robust transmit signal generation under noisy line conditions. Use Value: 82 dBc SFDR ensures compliance with G.992.5 spectral masks even with high upstream noise floor. | Use Scenario: Lab-grade DSL signal generators and conformance test platforms supporting multiple DSL standards. IC Role / Device Role / Timing Role: Programmable analog waveform source with precise amplitude and timing control. Use Value: 14-bit resolution and 125 MSPS sampling enable accurate emulation of VDSL2 tones up to 30 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DSL line driver DAC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9744BCPZ | 14-bit, 210 MSPS DAC; no integrated analog filter; requires external reconstruction filter | Used in wideband RF and broadband communications; not pre-qualified for DSL spectral masks | Choose AD9744BCPZ only when higher sampling rate is required and external filtering is acceptable |
| MAX5895EGK+ | 16-bit, 500 MSPS DAC; ±5 V max output swing; no integrated filter | Targeted at high-speed instrumentation and radar; lacks DSL-specific analog front-end optimization | Select MAX5895EGK+ for applications needing >14-bit resolution and wider bandwidth beyond DSL standards |
Compared with AD9744BCPZ and MAX5895EGK+, the LE87100NQC delivers DSL-optimized integration-its built-in 5th-order elliptic filter, ±12 V analog capability, and ITU-T-compliant SFDR eliminate external components and simplify certification, whereas alternatives require additional filtering, level-shifting, and spectral validation.
Availability
LE87100NQC is available at Aetrix Electronics and suitable for DSLAM line card development, VDSL2 vectoring system integration, and telecom infrastructure field deployment requiring stable component supply and long-term lifecycle support.
Supply support for LE87100NQC 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
Microsemi (acquired by Microchip Technology in 2018) is a semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened ICs for aerospace, defense, and communications.
The LE87100NQC belongs to Microsemi's DSL line interface product line, designed specifically for central office and remote terminal DSL transceiver applications requiring high-voltage, high-fidelity analog signal generation.
FAQ
What is the maximum sampling rate supported by the LE87100NQC?
The LE87100NQC supports a maximum sampling rate of 125 MSPS. This rate enables full utilization of the VDSL2 frequency band up to 30 MHz while maintaining signal integrity and spectral compliance per ITU-T G.993.2. The device's timing architecture ensures stable operation at this rate with proper clock conditioning and PCB layout.
Does the LE87100NQC require an external reconstruction filter?
No, the LE87100NQC does not require an external reconstruction filter. It integrates a fifth-order elliptic low-pass filter optimized for DSL applications. This on-chip filter meets anti-aliasing requirements for ADSL2+ and VDSL2, eliminating external passive components and reducing design complexity and board space for the LE87100NQC.
What analog supply voltages does the LE87100NQC support?
The LE87100NQC supports ±12 V analog supply rails. These voltages power its high-voltage output stage, enabling up to ±10 V differential output swing into 100 Ω. This capability is essential for achieving long-loop reach in DSL applications and is a key differentiator of the LE87100NQC versus general-purpose DACs.
Is the LE87100NQC pin-compatible with other Microsemi DSL DACs?
No, the LE87100NQC is not pin-compatible with other Microsemi DSL DACs such as the LE87101 or LE87102. Each variant features distinct pin assignments, power domains, and interface configurations. Board-level reuse requires verification against the specific LE87100NQC pinout and layout guidelines-not assumptions based on family similarity.
What digital interface does the LE87100NQC use?
The LE87100NQC uses a parallel 14-bit CMOS digital interface with separate CLK and FSYNC signals. Data is latched on the rising edge of CLK, and FSYNC indicates the start of each new sample word. This interface provides deterministic latency and supports multi-device synchronization in dense line card architectures using the LE87100NQC.
LE87100NQC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- 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:
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LE87100NQC FAQ
1.How can I place an order for LE87100NQC through Aetrix?
Please submit a Request for Quotation (RFQ) for LE87100NQC 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 LE87100NQC reliable?
The price and inventory of LE87100NQC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LE87100NQC is usually 5 days.
3.What payment methods are accepted for LE87100NQC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LE87100NQC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LE87100NQC?
LE87100NQC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LE87100NQC 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 LE87100NQC?
For technical support, including LE87100NQC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LE87100NQC requirements.
6.How does Aetrix verify that LE87100NQC is sourced from the original manufacturer or authorized distributors?
All LE87100NQC 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 LE87100NQC meets industry standards.
7.What is the process for return or replacement of LE87100NQC?
All LE87100NQC units undergo pre-shipment inspection (PSI). If there is an issue with LE87100NQC, 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 LE87100NQC part is unused and in its original packaging.
Return procedure for LE87100NQC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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