NXP Semiconductors MC14LC5480SDR2

Overview

MC14LC5480SDR2 from Freescale Semiconductor is a single-supply, 20-pin SSOP PCM codec-filter IC performing voice digitization and reconstruction with pin-selectable μ-law or A-law companding, on-chip 200 Hz–3400 Hz bandpass filtering, and integrated 1.575 V precision reference voltage - used in ISDN terminal adapters, digital PBX line cards, and T1/E1 channel banks.

For engineers reviewing the MC14LC5480SDR2 datasheet, MC14LC5480SDR2 pinout, MC14LC5480SDR2 application, or MC14LC5480SDR2 equivalent, key selection criteria include differential analog signal processing, 5 V operation with 15 mW typical power dissipation, support for Long/Short Frame Sync, IDL, and GCI timing modes, and compatibility with Motorola/Freescale telecom transceivers including MC145472 and MC145422.

Technical Context

The MC14LC5480SDR2 implements fully differential analog signal paths from TI+/TI– through switched-capacitor transmit bandpass (200 Hz–3400 Hz) and receive lowpass (3400 Hz) filters, with autozeroed sample-and-hold and sinX/X compensation. Its encoder uses successive-approximation ADC with binary-weighted CDAC and resistor-string RDAC, sharing a bandgap-referenced DAC between encode and decode paths.

Digital interface logic supports four synchronous timing modes: Long Frame Sync, Short Frame Sync, IDL (BCLKR = 1), and GCI (BCLKR = 0); frame sync detection is adaptive per pulse, and MCLK prescaling automatically accommodates 256 kHz to 4.096 MHz inputs to generate internal 256 kHz sequencing clocks.

Key Specifications

Pinout & Package

MC14LC5480SDR2 is housed in a 20-pin SSOP package (Case 940C), 0.65 mm pitch, 7.2 mm × 5.3 mm body size, with exposed pad not electrically connected. Pin functions are validated per Freescale Semiconductor technical data document MC14LC5480/D Rev 0.1 (May 1996).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC145480P, MC14LC5480SDR2 adds industrial temperature support and SSOP packaging; compared with TP3067CP, it integrates all filters and reference, cutting BOM count and improving thermal stability without sacrificing G.711 compliance.

Availability

MC14LC5480SDR2 is available at Aetrix Electronics and suitable for ISDN terminal adapters, digital PBX line cards, and T1/E1 channel banks requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant SSOP packaging.

Supply support for MC14LC5480SDR2 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) is a fabless semiconductor company specializing in embedded processing, analog, and mixed-signal ICs for automotive, industrial, and communications markets.

The MC14LC5480SDR2 belongs to Freescale's legacy telecom codec portfolio, designed specifically for voiceband digitization in carrier-class access equipment with minimal external components and robust noise immunity.

FAQ

What is the operating temperature range for the MC14LC5480SDR2?

The MC14LC5480SDR2 is specified for industrial temperature operation from –40°C to +85°C, validated per Freescale Semiconductor technical data MC14LC5480/D Rev 0.1. This range supports deployment in uncontrolled environments such as outdoor DSLAM cabinets and central office line cards where ambient temperatures exceed commercial limits. The MC14LC5480SDR2 maintains full G.711 μ-law/A-law encoding accuracy and 36 dB SNR across this range due to its bandgap-referenced architecture.

Does the MC14LC5480SDR2 require external filtering components?

No, the MC14LC5480SDR2 integrates all required analog filtering: a 3-pole active R-C anti-aliasing pre-filter, a 5-pole switched-capacitor transmit bandpass (200–3400 Hz), a 5-pole receive lowpass with sinX/X compensation, and a 2-pole active smoothing post-filter. Freescale's documentation confirms zero external passive components are needed to meet ITU-T G.712 group delay and stopband rejection specifications - reducing BOM count by up to 12 parts per channel versus discrete-filter codecs like TP3067.

How does the MC14LC5480SDR2 handle power-down mode?

The MC14LC5480SDR2 supports two independent power-down methods: asserting logic low on PDI (Pin 10), or holding both FST and FSR low for several 8 kHz frames. In either case, RO+/RO–, PO+/PO–, TG, DT, and VAG enter high-impedance states, reducing dissipation to 0.01 mW. The device requires ≥2 FST cycles to stabilize after wake-up, ensuring glitch-free PCM output - a behavior explicitly documented in the functional description section of MC14LC5480/D.

Can the MC14LC5480SDR2 interface directly with an ISDN S/T bus?

Yes, the MC14LC5480SDR2 supports Interchip Digital Link (IDL) mode when BCLKR is held high, reconfiguring FST, FSR, BCLKT, DT, and DR as IDL SYNC, IDL CLK, IDL TX, and IDL RX - enabling direct connection to ISDN S/T physical layer transceivers such as the MC145474/75. Freescale's application notes confirm interoperability with full 2B+D channel handling and automatic B1/B2 channel selection via FSR logic level.

What is the significance of the VAG pin on the MC14LC5480SDR2?

VAG (Pin 20) is a regulated 2.4 V analog ground output that serves as the reference for all internal analog circuitry - including TI+/TI–, RO+/RO–, and PO+/PO–. It must be decoupled with 0.01–0.1 µF ceramic capacitance to VSS. Unlike conventional ground pins, VAG is actively regulated and becomes high-impedance during power-down. Its stability directly determines encode/decode accuracy; Freescale specifies ±5 mV regulation tolerance over temperature and load, enabling precise 0 dBm0 level calibration without external references.