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NXP Semiconductors MC145484SDR2
- Part No.:
- MC145484SDR2
- Manufacturer:
- NXP Semiconductors
- Category:
- CODECS
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MC145484SDR2.pdf
- Description:
- IC CODEC PCM FILTER 13B 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,093
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Product details
Overview
MC145484SDR2 from Freescale Semiconductor is a 5 V single-supply PCM codec-filter IC performing voice digitization and reconstruction with pin-selectable μ-law or A-law companding, on-chip 200 Hz–3400 Hz band-pass filtering, and differential analog signal processing. It integrates transmit/receive filters, precision 1.575 V reference, and push-pull 300 Ω power drivers - optimized for electronic SLIC interfaces in telephony line cards.
For engineers reviewing the MC145484SDR2 datasheet, MC145484SDR2 pinout, MC145484SDR2 application, or MC145484SDR2 equivalent, key selection criteria include its differential switched-capacitor filter architecture, 8 kHz frame sync compatibility (Long/Short Frame Sync, IDL, GCI), 15 mW typical power dissipation, and VAG-referenced analog ground for noise-sensitive telephony signal paths.
Technical Context
The MC145484SDR2 implements a fully-differential analog signal path: input op-amp (TI+/TI−) feeds a differential R-C pre-filter, then a 5-pole switched-capacitor band-pass filter (200 Hz–3400 Hz), followed by a differential compressing ADC. Its receive path uses a differential DAC, sinX/X-compensated 3400 Hz low-pass filter, and active R-C post-filter.
Digital interface supports four timing modes (Long Frame Sync, Short Frame Sync, IDL, GCI) via pin-controlled BCLKR and FSR; MCLK accepts 256 kHz–4.096 MHz with automatic prescaling to generate internal 256 kHz sequencing clock. Power-down is achieved via PDI pin or dual-frame-sync hold, placing RO−, PO+, PO−, DT, TG, 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 line card designs. |
| Power Dissipation | 15 mW typical, 0.01 mW in power-down - enables low-heat operation in dense line-card layouts. |
| Companding | Pin-selectable μ-law (North America/Japan) or A-law (Europe) - supports global telephony standards without firmware change. |
| Reference Voltage | On-chip 1.575 V precision reference - sets −0 dBm TLP @ 600 Ω, enabling accurate gain calibration without external references. |
| Analog Bandwidth | Transmit: 200 Hz–3400 Hz band-pass; Receive: 3400 Hz low-pass - meets ITU-T G.711 spectral requirements for PSTN voice fidelity. |
| Output Drive | Push-pull PO+/PO− capable of 3.15 V peak into 300 Ω - directly interfaces SLICs or transformer-coupled telephone lines. |
| Digital Interface | Supports Long/Short Frame Sync, IDL, GCI - interoperates with Motorola MC14LC5472, MC145572, and MC3419 SLICs without protocol translation. |
Pinout & Package
MC145484SDR2 is packaged in 20-pin SSOP (case 940C), with lead pitch of 0.65 mm and body dimensions 7.2 mm × 5.3 mm - compatible with standard surface-mount assembly processes and IPC-7351B footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (6) | Positive supply | 5 V main power rail; requires 0.1 µF ceramic decoupling to VSS for analog stability. |
| VSS (15) | Negative supply | Ground reference for digital logic and power supply return path. |
| VAG (20) | Analog ground output | Mid-supply reference (2.5 V) for all analog circuitry; high-impedance in power-down mode. |
| Mu/A (16) | Companding select | Logic-high = μ-law; logic-low = A-law - enables field-configurable compliance with regional telephony standards. |
| PDI (10) | Power-down control | Logic-low forces full chip shutdown: clocks gated, bias currents off, all analog/digital outputs high-Z. |
| TG (17) | Transmit gain output | Output of TI+/TI− op-amp; drives transmit band-pass filter; high-Z when TI+ tied to VDD. |
| RO− (2) | Receive analog output | Inverting output of smoothing filter; drives 2 kΩ load to VAG; high-Z in power-down. |
| PO+ / PO− (5/4) | Power amplifier outputs | Differential push-pull outputs; deliver 3.15 V peak into 300 Ω; gain adjustable via external PI resistor network. |
| FST / FSR (14/7) | Frame sync inputs | 8 kHz sync signals for transmit/receive; dual-low hold triggers auto-power-down. |
| DT / DR (13/8) | PCM data I/O | Serial 8-bit PCM interface; direction and timing mode determined by BCLKR and FSR states. |
Key Features
| Feature | Design Value |
|---|---|
| Fully-differential analog design | Doubles allowable input amplitude vs. single-ended, rejects common-mode supply noise, and improves PSRR by >60 dB. |
| On-chip transmit/receive filters | Eliminates 4–6 external op-amps and passive components per channel - reduces BOM count and layout area. |
| VAG-referenced analog ground | High-impedance VAG output decouples internal analog reference from noisy VSS, minimizing clock feedthrough in SLIC-coupled systems. |
| Multiple digital interface modes | Hardware-selectable Long/Short Frame Sync, IDL, GCI - enables drop-in replacement across legacy Motorola telecom platforms. |
| External gain-adjustable power drivers | PO+/PO− gain set via PI resistor network - supports 32 Ω–300 Ω loads and piezoelectric transducers without redesign. |
Applications
| Electronic SLIC Interface | Digital Line Card |
|---|---|
Use Scenario: Interfacing with Motorola MC3419 or MC33120 SLICs in central office line cards. IC Role / Device Role / Timing Role: Performs A/D and D/A conversion, anti-aliasing and reconstruction filtering, and provides VAG-referenced analog signaling synchronized to 8 kHz frame clock. Use Value: Enables direct coupling to SLIC analog ports without level-shifting or external reference buffers, reducing component count by ≥7 parts per channel. | Use Scenario: Voice channel conditioning in multi-channel digital line cards for PBX or access multiplexers. IC Role / Device Role / Timing Role: Codec-filter for each voice channel; supports Long/Short Frame Sync for flexible backplane timing alignment. Use Value: Maintains <30 dB THD+N over 40 dB dynamic range while consuming only 15 mW - allows 32+ channels per 1U board without thermal derating. |
| ISDN Terminal Adapter | Legacy Telecom Gateway |
Use Scenario: B-channel digitization in S/T-interface terminal adapters compliant with ITU-T I.430. IC Role / Device Role / Timing Role: Receives 8-bit PCM from ISDN controller (e.g., MC145474/75), performs μ-law/A-law expansion, and drives analog line interface. Use Value: Hardware pin-selectable companding eliminates FPGA-based remapping logic, reducing gate count and latency. | Use Scenario: Retrofitting analog POTS lines into VoIP gateways using legacy Motorola telephony SoCs. IC Role / Device Role / Timing Role: Drop-in replacement for MC145484DW/SD/DT variants; maintains pinout and timing compatibility with MC14LC5472 U-interface transceivers. Use Value: Preserves existing PCB layout and firmware while upgrading to SSOP package for improved thermal performance and moisture resistance. |
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 | SOG package (case 751D), wider 1.27 mm pitch; identical electrical specs and pinout. | Preferred for through-hole prototyping or legacy SOG-compatible assemblies. | Select MC145484DW when board rework or hand-soldering is required; same functionality, different mechanical fit. |
| MC145484DT | TSSOP package (case 948E), same 20-pin count but thinner profile (1.1 mm height) and smaller footprint (6.5 mm × 4.4 mm). | Better suited for space-constrained VoIP gateway modules requiring high-density packaging. | Choose MC145484DT for ultra-thin line cards where Z-height is constrained; electrically identical to MC145484SDR2. |
Compared with MC145484DW and MC145484DT, the MC145484SDR2 offers identical analog/digital performance and pin compatibility in an SSOP package optimized for automated SMT assembly, thermal reliability, and IPC-compliant reflow profiles - making it the preferred choice for volume production of telecom infrastructure hardware.
Availability
MC145484SDR2 is available at Aetrix Electronics and suitable for electronic SLIC interfaces, digital line cards, ISDN terminal adapters, and legacy telecom gateways requiring stable component supply and long-term lifecycle support.
Supply support for MC145484SDR2 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 solutions for automotive, industrial, and communications markets.
The MC145484SDR2 belongs to Freescale's legacy telecommunication codec family, designed specifically for voice digitization in PSTN, ISDN, and digital line card applications - emphasizing low power, high noise immunity, and hardware-configurable timing compliance.
FAQ
What is the primary function of the MC145484SDR2 in a telephony system?
The MC145484SDR2 serves as a complete PCM codec-filter, performing analog-to-digital conversion (A/D) of voice signals with μ-law or A-law companding, band-limiting filtering (200 Hz–3400 Hz), and digital-to-analog reconstruction. In telephony systems, it enables digitized voice transmission over T1/E1 lines or ISDN interfaces while maintaining ITU-T G.711 compliance. The MC145484SDR2 integrates all required analog filtering, reference generation, and power driver functions on a single die - eliminating discrete op-amps and passive filters typically needed in legacy designs.
How does the VAG pin improve noise performance in the MC145484SDR2?
The VAG pin on the MC145484SDR2 provides a high-impedance mid-supply analog ground (2.5 V) that decouples internal analog circuitry from the noisy digital VSS ground plane. By referencing all analog signal paths - including TI+, TI−, RO−, and PO+/PO− - to VAG instead of VSS, the MC145484SDR2 minimizes clock feedthrough and power supply coupling into sensitive voice-band signals. This is especially critical in SLIC interfaces where VSS carries switching transients; the MC145484SDR2's VAG architecture reduces audible noise by >20 dB compared to VSS-referenced codecs.
Can the MC145484SDR2 operate with different PCM interface timing standards?
Yes, the MC145484SDR2 supports four industry-standard PCM timing modes: Long Frame Sync, Short Frame Sync, IDL (Integrated Digital Line), and GCI (Generic Circuit Interface). Mode selection is controlled by BCLKR (pin 9) and FSR (pin 7) logic states, with no firmware or register programming required. This hardware-selectable flexibility allows the MC145484SDR2 to interoperate with Motorola MC14LC5472 U-interface transceivers, MC145474/75 S/T-interface devices, and modern DSP-based telephony controllers - all while maintaining strict 8 kHz frame alignment and bit-clock tolerance.
What is the significance of the differential analog architecture in the MC145484SDR2?
The MC145484SDR2 employs a fully-differential analog signal path from TI+/TI− through the switched-capacitor filters to RO− and PO+/PO−. This architecture doubles the effective input voltage swing (±2.5 V vs. ±1.25 V in single-ended designs), improving SNR by 6 dB and reducing sensitivity to power supply noise. Common-mode rejection exceeds 70 dB, and differential processing cancels even-order harmonics - resulting in THD+N < −30 dB over 40 dB dynamic range. These characteristics make the MC145484SDR2 uniquely suited for high-fidelity voice applications where noise and distortion must meet stringent PSTN specifications.
Does the MC145484SDR2 require external components for basic operation?
The MC145484SDR2 requires minimal external components: 0.1 µF ceramic capacitors on VDD–VSS and VAG Ref–VSS, plus 0.01 µF on VAG–VSS for analog stability. External resistors set PO+/PO− gain via the PI pin, and optional RC networks may be added for TI+/TI− gain configuration. No external filters, references, or clock generators are needed - the MC145484SDR2 integrates all transmit/receive filtering, 1.575 V reference, and MCLK prescaling. This reduces bill-of-materials cost and PCB area versus discrete-filter alternatives, while ensuring consistent performance across temperature and voltage.
MC145484SDR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SSOP
MC145484SDR2 FAQ
1.How can I place an order for MC145484SDR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC145484SDR2 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 MC145484SDR2 reliable?
The price and inventory of MC145484SDR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC145484SDR2 is usually 5 days.
3.What payment methods are accepted for MC145484SDR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC145484SDR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC145484SDR2?
MC145484SDR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC145484SDR2 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 MC145484SDR2?
For technical support, including MC145484SDR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC145484SDR2 requirements.
6.How does Aetrix verify that MC145484SDR2 is sourced from the original manufacturer or authorized distributors?
All MC145484SDR2 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 MC145484SDR2 meets industry standards.
7.What is the process for return or replacement of MC145484SDR2?
All MC145484SDR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC145484SDR2, 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 MC145484SDR2 part is unused and in its original packaging.
Return procedure for MC145484SDR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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