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NXP Semiconductors MC14LC5540DW
- Part No.:
- MC14LC5540DW
- Manufacturer:
- NXP Semiconductors
- Category:
- CODECS
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC14LC5540DW.pdf
- Description:
- IC CODEC ADPCM 28-SOIC W
- Quantity:
- Payment:
- Shipping:
Inventory:1,293
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Product details
Overview
MC14LC5540DW from Motorola (Freescale) is a single-supply 5 V PCM codec-filter IC performing voice digitization and reconstruction with on-chip transmit band-pass (200 Hz–3.4 kHz) and receive low-pass (3.4 kHz) filtering, pin-selectable μ-law/A-law companding, and integrated precision 1.575 V reference for –0 dBm TLP @ 600 Ω. It serves as the analog front-end in telephony line interface circuits.
For engineers reviewing the MC14LC5540DW datasheet, MC14LC5540DW pinout, MC14LC5540DW application, or MC14LC5540DW equivalent, key selection criteria include its differential analog signal path, 15 mW typical power dissipation, 8 kHz sampling support, push-pull 300 Ω power drivers, and compatibility with IDL/GCI/Short/Long Frame Sync digital interfaces.
Technical Context
The MC14LC5540DW implements a fully-differential analog signal chain: transmit path includes active R-C pre-filtering, differential switched-capacitor band-pass (200 Hz–3.4 kHz), and compressing A/D conversion; receive path uses differential D/A expansion, sinX/X-compensated 3.4 kHz low-pass filtering, and active R-C post-filtering. All analog processing references the high-impedance VAG mid-supply ground.
It supports four digital timing modes-Long Frame Sync, Short Frame Sync, IDL (BCLKR = 1), and GCI (BCLKR = 0)-with automatic MCLK prescaling for 256 kHz–4.096 MHz inputs. Power-down is achieved via PDI pin (0.01 mW) or dual-frame-sync hold, disabling clocks, bias currents, and placing RO–, PO+, PO–, TG, DT, and VAG in high-impedance state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | Single 5 V rail - eliminates need for dual supplies in telephony analog front-ends. |
| Power Dissipation | 15 mW typical, 0.01 mW in power-down - enables low-power SLIC and ISDN terminal designs. |
| Companding | Pin-selectable μ-law (North America/Japan) or A-law (Europe) - ensures regional PSTN/ISDN compliance without firmware change. |
| Reference Voltage | 1.575 V on-chip precision reference - sets exact –0 dBm transmission level point at 600 Ω load. |
| Transmit Filter | 200 Hz–3.4 kHz differential switched-capacitor band-pass - meets ITU-T G.711 spectral mask for voiceband limiting. |
| Receive Filter | 3.4 kHz sinX/X-compensated low-pass + active R-C smoothing - suppresses aliasing and switched-capacitor artifacts. |
| Output Drivers | Push-pull PO+/PO– capable of 3.15 V peak into 300 Ω - directly interfaces with telephone hybrid transformers. |
Pinout & Package
MC14LC5540DW is housed in a 20-pin SOG (Small Outline Gull-wing) package per Case 751D, with 0.65 mm lead pitch and surface-mount gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (6) | Positive supply | 5 V input requiring 0.1 µF ceramic decoupling to VSS - powers all analog/digital sections. |
| VSS (15) | Negative supply / digital ground | 0 V reference for digital logic and power supply return - separate from analog VAG reference. |
| VAG (20) | Analog ground output | Mid-supply 2.5 V reference for all analog circuitry - high-impedance during power-down. |
| VAG Ref (1) | Reference bypass | Capacitive bypass node for internal VAG generator - requires 0.1 µF ceramic to VSS with low-inductance trace. |
| Mu/A (16) | Companding select | Logic-high = μ-law, logic-low = A-law - configures encoder/decoder compression law at power-up. |
| PDI (10) | Power-down control | Logic-low activates ultra-low-power mode (0.01 mW) - gates clocks and disables all analog outputs. |
| TI+ (19), TI– (18) | Transmit input op-amp | Differential input stage for voice signal conditioning - supports single-ended-to-differential conversion. |
| TG (17) | Transmit gain output | Op-amp output feeding transmit filter - high-impedance when TI+ tied to VDD for external signal injection. |
| RO– (2) | Receive analog output | Inverting output of smoothing filter - drives 2 kΩ load to VAG with 1.575 V peak amplitude. |
| PI (3), PO– (4), PO+ (5) | Power amplifier interface | Inverting op-amp input (PI) and push-pull outputs (PO±) - set gain externally; powered down when PI = VDD. |
| MCLK (11) | Master clock input | Accepts 256 kHz–4.096 MHz - auto-prescaled to generate internal 256 kHz sequencing clock. |
| FST (14), FSR (7) | Frame sync inputs | 8 kHz sync signals for transmit/receive - dual-low hold enables hardware power-down without PDI. |
| BCLKT (12), BCLKR (9) | Bit clock inputs | 64–4096 kHz (Long/Short Sync) or up to 6.176 MHz (GCI) - determines PCM data rate and interface mode. |
| DT (13), DR (8) | PCM data I/O | Serial 8-bit μ-law/A-law PCM interface - direction and timing mode determined by FST/FSR/BCLKR states. |
Key Features
| Feature | Design Value |
|---|---|
| Fully-differential analog design | Enables 2× input signal swing vs. single-ended, rejects common-mode supply noise, and improves PSRR by >60 dB. |
| On-chip precision voltage reference | 1.575 V bandgap-derived reference ensures accurate –0 dBm TLP calibration without external components. |
| Integrated transmit/receive filters | Eliminates 4–6 external op-amps and RC networks - reduces BOM count and board area in SLIC designs. |
| Multiple digital interface support | Hardware-configurable Long/Short Frame Sync, IDL, and GCI modes - interoperates with Motorola U/S/T-interface transceivers. |
| Independent power amplifier control | PI pin allows standalone shutdown of 300 Ω drivers without affecting codec operation - simplifies hybrid interface management. |
| Low-noise active R-C pre/post-filtering | Suppresses out-of-band switching noise before and after SC filters - avoids audible artifacts in reconstructed voice. |
Applications
| Electronic SLIC Interface | ISDN Terminal Adapter |
|---|---|
|
Use Scenario: Interfacing a digital switch ASIC to analog telephone line using a passive hybrid transformer. IC Role / Device Role / Timing Role: PCM codec-filter providing A/D and D/A conversion, band-limiting, and line-driver amplification synchronized to 8 kHz frame clock. Use Value: Direct 300 Ω push-pull drive eliminates external line driver ICs; VAG-referenced analog path minimizes clock feedthrough into hybrid. |
Use Scenario: Converting analog handset signals to B-channel PCM for S/T-interface ISDN transceivers (e.g., MC145474). IC Role / Device Role / Timing Role: Voiceband signal conditioner and μ-law/A-law encoder/decoder aligned to GCI or IDL timing standards. Use Value: Pin-selectable companding and BCLKR-configurable interface eliminate firmware adaptation across regional ISDN deployments. |
| VoIP Gateway FXS Port | Digital PBX Line Card |
|
Use Scenario: Providing analog telephony service (FXS) in IP-based gateways with DSP-based echo cancellation. IC Role / Device Role / Timing Role: Low-latency analog front-end with precise 0 dBm level setting and differential signaling for noise immunity. Use Value: 15 mW typical dissipation enables dense multi-port designs; power-down mode reduces thermal load during idle periods. |
Use Scenario: Supporting multiple analog extensions on a carrier-grade digital PBX with centralized clock distribution. IC Role / Device Role / Timing Role: Synchronous PCM interface device operating from shared 8 kHz FST/FSR and master clock infrastructure. Use Value: Automatic MCLK prescaling accepts 256 kHz–4.096 MHz clocks - simplifies clock tree design across mixed-speed systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PCM codec-filter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC145484DW | Same die, identical electrical specs and pinout - differs only in SOG package suffix (DW vs. DW); both use Case 751D. | Direct drop-in replacement with identical footprint, thermal profile, and layout - no PCB revision required. | Select MC145484DW when sourcing legacy Freescale/Motorola stock; MC14LC5540DW is functionally identical but may reflect later wafer lot or marking convention. |
| TP3054 | Single 5 V supply, μ-law only, no A-law support; lacks VAG Ref pin and independent PI-controlled power-down. | Suitable for North American PSTN-only designs where A-law compliance and advanced power management are unnecessary. | Choose TP3054 for cost-sensitive μ-law-only applications; MC14LC5540DW adds A-law flexibility, superior PSRR, and finer-grained power control. |
Compared with MC145484DW, the MC14LC5540DW offers identical performance and compatibility, while TP3054 provides lower-cost μ-law-only operation at the expense of regional flexibility and analog noise immunity.
Availability
MC14LC5540DW is available at Aetrix Electronics and suitable for electronic SLIC interfaces, ISDN terminal adapters, and VoIP FXS port designs requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for MC14LC5540DW 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
Motorola Semiconductor (later Freescale Semiconductor) pioneered high-reliability analog telephony ICs for telecom infrastructure, emphasizing robustness, precision reference design, and system-level interoperability.
The MC14LC5540DW belongs to Motorola's PCM codec-filter product line, engineered specifically for voiceband digitization in SLIC, ISDN, and digital PBX applications with strict ITU-T G.711 compliance requirements.
FAQ
What is the primary function of the MC14LC5540DW in a telephony system?
The MC14LC5540DW serves as a complete PCM codec-filter, performing analog-to-digital conversion (A/D) of voice signals with μ-law or A-law companding, and digital-to-analog conversion (D/A) for reconstruction. It integrates transmit band-pass (200 Hz–3.4 kHz) and receive low-pass (3.4 kHz) filtering, a precision 1.575 V reference for –0 dBm TLP calibration, and push-pull 300 Ω line drivers - all within a single 5 V supply. This makes the MC14LC5540DW ideal for SLIC, ISDN, and VoIP analog interface applications.
How does the MC14LC5540DW handle power management in low-duty-cycle systems?
The MC14LC5540DW supports two hardware-based power-down methods: asserting logic-low on the PDI pin (reducing dissipation to 0.01 mW), or holding both FST and FSR low while maintaining MCLK/BCLKT activity. In either mode, analog outputs (RO–, PO+, PO–, TG), digital output (DT), and VAG enter high-impedance state, and internal clocks/bias currents are disabled. The MC14LC5540DW resumes full operation within two 8 kHz frame cycles after PDI returns high and FST is reasserted - enabling rapid wake-up in burst-mode telephony systems.
Can the MC14LC5540DW be used with both μ-law and A-law companding in the same design?
No - the MC14LC5540DW selects companding law at power-up via the Mu/A pin (Pin 16): logic-high configures μ-law (used in North America and Japan), logic-low configures A-law (used in Europe). The selection is static and cannot be changed dynamically during operation. However, the MC14LC5540DW's pin-compatible variants (e.g., MC145484DW) and identical functional behavior allow manufacturers to stock one footprint and configure regionally via pull-up/pull-down on Mu/A - making the MC14LC5540DW suitable for global product variants without redesign.
What digital interface modes does the MC14LC5540DW support, and how are they selected?
The MC14LC5540DW supports four industry-standard PCM timing modes: Long Frame Sync, Short Frame Sync, IDL (BCLKR = 1), and GCI (BCLKR = 0). Mode selection is determined by the logic state of BCLKR (Pin 9) and the timing relationship between FST/FSR and BCLKT/BCLKR. No configuration register or software is needed - all mode detection is hardware-automated. This allows the MC14LC5540DW to interoperate seamlessly with Motorola's MC145474/75 S/T-interface transceivers, MC145572 U-interface devices, and other legacy telephony ICs without firmware overhead.
Is the MC14LC5540DW compatible with modern 3.3 V digital controllers?
The MC14LC5540DW operates exclusively from a 5 V supply (VDD = 5 V ± 5%) and is not 3.3 V tolerant on any digital input (FST, FSR, BCLKT, BCLKR, PDI, Mu/A). Its digital I/O pins are designed for 5 V CMOS logic levels. To interface with 3.3 V controllers, level-shifting buffers are required on all control and clock lines. The MC14LC5540DW's analog section remains fully functional under this condition, as its internal reference and signal paths are independent of digital I/O voltage - ensuring that the MC14LC5540DW maintains accurate –0 dBm TLP calibration and voiceband fidelity regardless of external logic voltage.
MC14LC5540DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- PCM, Filter
- Data Interface:
- PCM Audio Interface
- Resolution (Bits):
- 13 b
- Number of ADCs / DACs:
- 1 / 1
- Sigma Delta:
- No
- S/N Ratio, ADCs / DACs (db) Typ:
- -
- Dynamic Range, ADCs / DACs (db) Typ:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
MC14LC5540DW FAQ
1.How can I place an order for MC14LC5540DW through Aetrix?
Please submit a Request for Quotation (RFQ) for MC14LC5540DW 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 MC14LC5540DW reliable?
The price and inventory of MC14LC5540DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC14LC5540DW is usually 5 days.
3.What payment methods are accepted for MC14LC5540DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC14LC5540DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC14LC5540DW?
MC14LC5540DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC14LC5540DW 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 MC14LC5540DW?
For technical support, including MC14LC5540DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC14LC5540DW requirements.
6.How does Aetrix verify that MC14LC5540DW is sourced from the original manufacturer or authorized distributors?
All MC14LC5540DW 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 MC14LC5540DW meets industry standards.
7.What is the process for return or replacement of MC14LC5540DW?
All MC14LC5540DW units undergo pre-shipment inspection (PSI). If there is an issue with MC14LC5540DW, 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 MC14LC5540DW part is unused and in its original packaging.
Return procedure for MC14LC5540DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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