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NXP Semiconductors MC145484EJ
- Part No.:
- MC145484EJ
- Manufacturer:
- NXP Semiconductors
- Category:
- CODECS
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MC145484EJ.pdf
- Description:
- IC CODEC-FILTER PCM 5V 20-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,702
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Product details
Overview
MC145484EJ from Freescale Semiconductor is a single-supply, 5 V PCM codec-filter IC performing voice digitization and reconstruction with pin-selectable μ-law or A-law companding. It integrates transmit band-pass (200–3400 Hz) and receive low-pass (3400 Hz) filters, on-chip 1.575 V precision reference, and fully differential analog signal path for SLIC interface applications in telephony systems.
For engineers reviewing the MC145484EJ datasheet, MC145484EJ pinout, MC145484EJ application, or MC145484EJ equivalent, key selection criteria include its 20-pin TSSOP package, 8 kHz sampling rate support, differential 300 Ω push-pull power drivers, power-down capability (0.01 mW), and compatibility with IDL/GCI/Long/Short Frame Sync digital interfaces.
Technical Context
The MC145484EJ implements a fully differential analog signal chain: TI+/TI− inputs feed an inverting op-amp (TG output), followed by active R-C pre-filtering, single-ended-to-differential conversion, and 5-pole switched-capacitor band-pass filtering (200–3400 Hz) before the differential compressing ADC. The decoder uses a differential DAC, sinX/X-compensated 3400 Hz low-pass filter, and active R-C post-filtering.
Digital timing is flexible: MCLK accepts 256 kHz–4.096 MHz with automatic prescaling; FST/FSR support 8 kHz frame sync; BCLKT/BCLKR enable Long/Short Frame Sync, IDL (BCLKR = 1), or GCI (BCLKR = 0) modes; Mu/A pin selects μ-law (VDD) or A-law (VSS) companding per ITU-T G.711.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | Single 5 V rail - eliminates need for dual supplies in telephony line cards. |
| Power Dissipation | 15 mW typical active, 0.01 mW in power-down - enables low-heat SLIC co-location. |
| Companding Standard | Pin-selectable μ-law or A-law per ITU-T G.711 - supports global telephony infrastructure without firmware change. |
| Analog Bandwidth | Transmit: 200–3400 Hz band-pass; Receive: 3400 Hz low-pass - meets POTS voiceband requirements with integrated filtering. |
| Reference Voltage | 1.575 V on-chip precision reference - sets –0 dBm TLP @ 600 Ω without external components. |
| Output Drive | Differential 300 Ω push-pull (PO+/PO−) - delivers 6.3 Vpp into 300 Ω for direct SLIC coupling. |
| Digital Interface | Supports Long/Short Frame Sync, IDL, GCI - interoperates with Motorola MC145572, MC145474, and MC3419 SLICs. |
Pinout & Package
MC145484EJ is packaged in a 20-pin TSSOP (Case 948E), pin-compatible with MC145484DT. The package provides compact footprint and thermal performance suitable for space-constrained telephony line interface cards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (6) | Positive supply | 5 V main power rail; requires 0.1 µF ceramic decoupling to VSS. |
| VSS (15) | Negative supply | Ground reference for digital logic and power supply return. |
| VAG (20) | Analog ground output | Mid-supply (2.5 V) reference for all analog circuitry; high-impedance in power-down. |
| Mu/A (16) | Companding select | Logic-high = μ-law; logic-low = A-law - configures encoder/decoder per regional standard. |
| PDI (10) | Power-down control | Logic-low disables clocks/bias currents; DT, RO−, PO+, PO−, TG go high-Z. |
| TI+ (19), TI− (18) | Transmit input pair | Fully differential op-amp inputs; support level-shifting for VSS-referenced signals. |
| TG (17) | Transmit gain output | Op-amp output feeding anti-alias filter; high-Z when TI+ tied to VDD. |
| RO− (2) | Receive output (inverting) | Differential output of smoothing filter; drives 2 kΩ load to VAG. |
| PI (3), PO− (4), PO+ (5) | Power amplifier stage | Inverting gain circuit (PI) with push-pull outputs (PO+/PO−); drives 300 Ω load at +12 dBm. |
| MCLK (11), FST (14), BCLKT (12), DT (13) | Transmit digital interface | Accepts master clock (256 kHz–4.096 MHz), 8 kHz frame sync, bit clock, and serial PCM output. |
| FSR (7), BCLKR (9), DR (8) | Receive digital interface | Frame sync, bit clock, and PCM data input; mode selected via BCLKR (IDL/GCI). |
Key Features
| Feature | Design Value |
|---|---|
| Fully differential analog path | Doubles effective input amplitude and cancels common-mode supply noise, improving PSRR by >60 dB. |
| Integrated band-limiting filters | On-chip 5-pole transmit band-pass (200–3400 Hz) and receive low-pass (3400 Hz) eliminate external filter components. |
| VAG reference architecture | High-impedance mid-supply output (Pin 20) decoupled from VSS reduces clock feedthrough into analog circuits. |
| Multiple digital interface modes | Hardware-selectable Long/Short Frame Sync, IDL, or GCI timing ensures drop-in compatibility with legacy telecom ASICs. |
| SLIC-optimized power drivers | Push-pull 300 Ω outputs (PO+/PO−) deliver 6.3 Vpp at +12 dBm with external gain adjustment resistors. |
Applications
| Electronic SLIC Interface | Digital Line Card |
|---|---|
Use Scenario: Interfacing with Motorola MC3419 or MC33120 SLICs in analog telephone line interface circuits. IC Role / Device Role / Timing Role: PCM codec-filter providing digitized voice path between SLIC analog front-end and digital switch fabric. Use Value: Eliminates external anti-alias/reconstruction filters and reference voltage sources, reducing BOM count by ≥7 passive components. | Use Scenario: Voice channel processing in carrier-grade digital line cards supporting multiple POTS lines. IC Role / Device Role / Timing Role: Per-channel voice digitization and reconstruction with μ-law companding for TDM backplane interfacing. Use Value: 15 mW power dissipation enables 32-channel density on 10 W line card budget without forced air cooling. |
| ISDN Terminal Adapter | VoIP Gateway FXS Port |
Use Scenario: B-channel voice processing in ISDN terminal adapters using IDL or GCI interface mode. IC Role / Device Role / Timing Role: Codec converting analog voice to 64 kbps PCM for B1/B2 channel multiplexing per ITU-T I.430. Use Value: Pin-selectable IDL/GCI mode (via BCLKR) allows single PCB design for North American (IDL) and European (GCI) ISDN deployments. | Use Scenario: Analog telephony adapter (ATA) FXS port bridging PSTN to VoIP networks. IC Role / Device Role / Timing Role: Voiceband codec interfacing with VoIP DSP via Short Frame Sync timing and 8 kHz sampling. Use Value: Power-down mode (0.01 mW) enables always-on standby with <10 µA quiescent current during call silence detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PCM codec-filter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC145484DT | Same die, TSSOP-20 package (Case 948E); identical electrical specs and pinout. | No functional difference; EJ and DT share full form-fit-function compatibility. | Select MC145484DT if TSSOP-20 is preferred for automated assembly or thermal profile constraints. |
| MC145484SD | Same die, SSOP-20 package (Case 940C); identical electrical specs but different land pattern and thermal resistance. | SSOP variant offers slightly higher moisture sensitivity level (MSL 3 vs MSL 1 for TSSOP), requiring tighter handling controls. | Choose MC145484SD only when legacy SSOP footprint must be maintained; verify reflow profile compatibility. |
Compared with MC145484DT and MC145484SD, the MC145484EJ shares identical core functionality and pinout but is specifically qualified for extended temperature operation (–40°C to +85°C) and industrial reliability screening, making it preferred for carrier-grade line cards where ambient temperature excursions exceed commercial grade limits.
Availability
MC145484EJ is available at Aetrix Electronics and suitable for electronic SLIC interfaces, digital line cards, ISDN terminal adapters, and VoIP gateway FXS ports requiring stable component supply across multi-year production cycles.
Supply support for MC145484EJ 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 automotive, industrial, and networking solutions with strong heritage in telecommunication ICs.
The MC145484EJ belongs to Freescale's legacy telephony codec portfolio, designed specifically for analog line interface applications requiring integrated filtering, companding, and SLIC driver compatibility in single-5V systems.
FAQ
What is the operating temperature range for the MC145484EJ?
The MC145484EJ is rated for industrial temperature operation from –40°C to +85°C. This extended range distinguishes it from commercial-grade variants like MC145484DT and ensures reliable performance in telecom line cards exposed to uncontrolled cabinet environments. All electrical specifications in the datasheet are guaranteed across this full range.
Does the MC145484EJ require external anti-alias or reconstruction filters?
No, the MC145484EJ integrates both transmit band-pass (200–3400 Hz) and receive low-pass (3400 Hz) filters on-die. Its internal 5-pole switched-capacitor filters and active R-C stages eliminate the need for external analog filters, reducing system cost and board area. Only minimal decoupling capacitors (0.1 µF on VDD, 0.01 µF on VAG) are required.
How does the MC145484EJ achieve power supply noise rejection?
The MC145484EJ achieves high power supply rejection ratio (PSRR) through its fully differential analog signal path and dedicated VAG (analog ground) output. Common-mode noise on VDD/VSS is rejected at the differential nodes, while the high-impedance VAG pin-decoupled separately to VSS-isolates analog circuitry from digital supply transients, improving PSRR by over 60 dB.
Can the MC145484EJ interface directly with Motorola SLICs such as MC3419?
Yes, the MC145484EJ is explicitly designed for interoperability with Motorola SLICs including MC3419 and MC33120. Its differential 300 Ω push-pull outputs (PO+/PO−), –0 dBm TLP calibration (1.575 V reference), and electronic SLIC interface optimization ensure seamless analog coupling without level-shifting or gain adjustment circuitry.
What digital interface modes does the MC145484EJ support, and how are they selected?
The MC145484EJ supports Long Frame Sync, Short Frame Sync, IDL (BCLKR = 1), and GCI (BCLKR = 0) modes. Mode selection is hardware-controlled: BCLKR state determines IDL/GCI; FST/FSR pulse width discriminates Long vs Short Frame Sync. No software configuration is needed - timing behavior is fully determined by external clock and sync signal edges.
MC145484EJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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:
- 20-TSSOP
MC145484EJ FAQ
1.How can I place an order for MC145484EJ through Aetrix?
Please submit a Request for Quotation (RFQ) for MC145484EJ 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 MC145484EJ reliable?
The price and inventory of MC145484EJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC145484EJ is usually 5 days.
3.What payment methods are accepted for MC145484EJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC145484EJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC145484EJ?
MC145484EJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC145484EJ 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 MC145484EJ?
For technical support, including MC145484EJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC145484EJ requirements.
6.How does Aetrix verify that MC145484EJ is sourced from the original manufacturer or authorized distributors?
All MC145484EJ 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 MC145484EJ meets industry standards.
7.What is the process for return or replacement of MC145484EJ?
All MC145484EJ units undergo pre-shipment inspection (PSI). If there is an issue with MC145484EJ, 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 MC145484EJ part is unused and in its original packaging.
Return procedure for MC145484EJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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