NXP Semiconductors MC14LC5480ENR2

Overview

MC14LC5480ENR2 from Freescale Semiconductor is a single-supply, fully-differential 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 1.575 V precision reference voltage - used in telephony line interface cards and ISDN terminal adapters.

For engineers reviewing the MC14LC5480ENR2 datasheet, MC14LC5480ENR2 pinout, MC14LC5480ENR2 application, or MC14LC5480ENR2 equivalent, key selection criteria include its 5 V operation, 15 mW typical power dissipation, differential analog signal processing architecture, support for Long/Short Frame Sync, IDL, and GCI digital interfaces, and compatibility with Motorola/Freescale telecom transceivers like MC145472 and MC145422.

Technical Context

The MC14LC5480ENR2 implements a successive-approximation ADC and DAC sharing a differential switched-capacitor architecture, with autozeroed sample-and-hold, 5-pole transmit band-pass filtering, and sinX/X-compensated 5-pole receive low-pass filtering. Its analog path is fully differential from TI+/TI– through TG to RO+/RO–, enabling 2× input amplitude headroom and common-mode noise rejection.

Digital timing is flexible: MCLK accepts 256 kHz–4.096 MHz with automatic prescaling; FST/FSR support asynchronous frame sync; BCLKR selects IDL (logic high) or GCI (logic low); and Mu/A pin configures companding law. Power-down is achieved via PDI pin or simultaneous FST/FSR low assertion.

Key Specifications

Pinout & Package

MC14LC5480ENR2 is packaged in a 20-pin SSOP (Small Outline Package), case 940C, with 0.65 mm lead pitch and surface-mount footprint. Pin assignments are validated per Freescale's official MC14LC5480/D datasheet Rev 0.1 (May 1996).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PCM codec applications.

Compared with MC145480P, MC14LC5480ENR2 delivers 40% lower active power and SSOP packaging for compact layouts; versus TP3067CP, it integrates differential signaling, on-chip reference, and 300 Ω line drivers - reducing total solution size by ~35% and eliminating four external components per channel.

Availability

MC14LC5480ENR2 is available at Aetrix Electronics and suitable for telephony line interface cards, ISDN terminal adapters, digital PBX voice ports, and VoIP gateway analog FXS interfaces requiring stable component supply across extended production lifecycles.

Supply support for MC14LC5480ENR2 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

Freescale Semiconductor (now part of NXP Semiconductors) was a leading designer of high-performance analog and mixed-signal ICs for telecommunications infrastructure and automotive systems.

The MC14LC5480ENR2 belongs to Freescale's legacy telecom codec family, engineered specifically for voiceband digitization in PSTN, ISDN, and PBX applications - emphasizing low power, high noise immunity, and hardware-configurable standards compliance.

FAQ

What is the primary function of the MC14LC5480ENR2 in a telephony system?

The MC14LC5480ENR2 serves as a complete PCM codec-filter, performing analog-to-digital and digital-to-analog conversion of voiceband signals (200 Hz–3.4 kHz) with μ-law or A-law companding. In telephony systems, it digitizes analog voice from POTS lines for digital switching or transmission and reconstructs received PCM data into analog audio - all within a single 20-pin SSOP package with integrated filters and reference.

Does the MC14LC5480ENR2 require external passive components for basic operation?

No, the MC14LC5480ENR2 requires only decoupling capacitors: a 0.1 µF ceramic capacitor between VDD and VSS, and a 0.01–0.1 µF capacitor between VAG and VSS. All critical analog functions - including anti-aliasing, reconstruction, and companding - are implemented on-die. External resistors are needed only for gain setting on TI–/PI pins or power amplifier configuration.

How does the MC14LC5480ENR2 handle power-down, and what happens to its outputs?

The MC14LC5480ENR2 supports two power-down methods: asserting logic low on PDI (Pin 10), or holding both FST and FSR low for several 8 kHz frames. During power-down, RO+, RO–, PO+, PO–, TG, VAG, and DT enter high-impedance states. The device consumes only 0.01 mW and resumes normal operation within two FST cycles after PDI returns high and frame sync is restored.

Can the MC14LC5480ENR2 interface directly with an ISDN S/T-interface transceiver?

Yes - the MC14LC5480ENR2 is explicitly designed for interoperability with Freescale's MC145474/75 S/T-interface transceivers. It supports IDL and GCI timing modes via BCLKR pin control, enabling seamless connection to ISDN BRI physical layer devices. Its 8-bit serial PCM I/O, frame sync, and bit clock interfaces align directly with S/T transceiver requirements without protocol translation.

What is the significance of the VAG pin (Pin 20) in the MC14LC5480ENR2 analog signal chain?

The VAG pin (Pin 20) provides a regulated 2.4 V mid-supply analog ground reference for the entire differential analog signal path - including TI+/TI–, TG, RO+/RO–, and PO+/PO–. All internal analog circuitry is referenced to VAG, not VSS, enabling true differential operation and rejecting common-mode noise. It becomes high-impedance during power-down and must be decoupled with a 0.01–0.1 µF ceramic capacitor to maintain stability.