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NXP Semiconductors MC145483FC
- Part No.:
- MC145483FC
- Manufacturer:
- NXP Semiconductors
- Category:
- CODECS
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
MC145483FC.pdf
- Description:
- IC PCM CODFIL 3V 13BIT LIN 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,623
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Product details
Overview
MC145483FC from Freescale Semiconductor is a 13-bit linear 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, 2's complement data format, and integrated precision 0.886 V reference for –5 dBm TLP at 600 Ω. It operates from a single 3 V supply and supports both synchronous and asynchronous clocking in telephony and digital communication systems.
For engineers reviewing the MC145483FC datasheet, MC145483FC pinout, MC145483FC application, or MC145483FC equivalent, key selection considerations include its differential analog architecture for >75 dB dynamic range, programmable receive gain control (0 to –21 dB in 3 dB steps), high-impedance VAG reference for noise-sensitive analog grounding, and QFN-32 package compatibility with space-constrained voice front-end designs.
Technical Context
The MC145483FC implements fully-differential analog signal processing from TI+/TI– through switched-capacitor filters and 13-bit ADC/DAC, enabling 2× input amplitude headroom and common-mode power supply noise rejection. Its transmit path includes active R-C pre-filtering, 3-pole anti-aliasing LPF, differential converter, 5-pole SC band-pass filter, and autozeroed sample-and-hold; receive path uses 13-bit DAC, 5-pole sinX/X-corrected SC LPF, active R-C post-filter, and push-pull 300 Ω drivers.
It supports four digital interface modes: Long/Short Frame Sync, sign-bit extended (16-bit), and receive gain-adjust (16-bit with 3-bit attenuation control). Master clock (MCLK) accepts 256 kHz–4.096 MHz with automatic prescaling to generate internal 256 kHz sequencing; frame sync (FST/FSR) runs at 8 kHz, and bit clocks (BCLKT/BCLKR) support 256–4096 kHz rates.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 13-bit linear ADC/DAC with 2's complement output - enables ≥75 dB dynamic range and <1 LSB idle-channel noise for high-fidelity voice coding. |
| Supply Voltage | Single 3 V - simplifies power design in battery- and line-powered telephony equipment without need for dual or split supplies. |
| Power Dissipation | Typical 8 mW active, 0.01 mW power-down - supports low-power voice interfaces in portable or energy-sensitive systems. |
| Analog Bandwidth | Transmit: 200 Hz–3.4 kHz band-pass; Receive: ≤3.4 kHz low-pass - meets ITU-T G.711 spectral requirements for PSTN and VoIP endpoints. |
| Reference Voltage | On-chip 0.886 V precision reference - sets –5 dBm TLP at 600 Ω, eliminating external voltage reference components and calibration drift. |
| Digital Interface | Supports Long/Short Frame Sync, sign-extended, and receive-gain-adjust modes - provides flexible integration with DSPs, microcontrollers, and TDM buses. |
| Receive Gain Control | 0 dB to –21 dB in 3 dB steps via 3-bit code - allows real-time analog output level adjustment without external attenuators or PGA stages. |
Pinout & Package
MC145483FC is housed in a 32-pin QFN package (Case 1311), thermally enhanced with exposed thermal pad, footprint-compatible with standard QFN reflow profiles and suitable for high-density PCB layouts in voice gateway and modem applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 15) | Positive power supply | 3 V supply input; requires 0.1 µF ceramic decoupling to VSS for stable analog/digital operation. |
| VSS (Pin 24) | Negative power supply | Ground reference for digital logic and power supply return; serves as common reference for bypass capacitors. |
| VAG (Pin 32) | Analog ground output | Mid-supply (1.5 V) reference for all analog circuitry; high-impedance in power-down mode to isolate analog section. |
| VAG Ref (Pin 1) | Analog ground reference bypass | Bypass node for internal VAG generator; must be decoupled to VSS with 0.1 µF capacitor using short, low-inductance trace. |
| TI+ / TI– (Pins 19/18) | Transmit analog input (differential) | FET-input op-amp terminals supporting inverting gain configuration; common-mode range = 1.2 V to VDD–1.2 V. |
| TG (Pin 17) | Transmit gain amplifier output | Drives transmit filter; becomes high-impedance when TI+ tied to VDD, enabling direct analog input to filter stage. |
| RO– (Pin 2) | Receive analog output (inverting) | Output of smoothing filter; drives 2 kΩ load to 0.886 V peak referenced to VAG; high-impedance in power-down. |
| PO– / PO+ (Pins 4/5) | Push-pull power amplifier outputs | Differential 300 Ω drivers delivering 3.544 Vpp; gain adjustable via external resistors at PI (Pin 3); powered down when PI = VDD. |
| HB (Pin 16) | Transmit high-pass filter bypass | Logic-low enables 3rd-order 200 Hz HPF for 50/60 Hz rejection; logic-high bypasses for DC-coupled input support. |
| PDI (Pin 10) | Power-down input | Active-low control; places DT, RO–, PO–, PO+, TG, and VAG in high-impedance state and gates internal clocks. |
| MCLK (Pin 11) | Master clock input | Accepts 256 kHz–4.096 MHz; internally prescaled to generate 256 kHz timing for ADC, DAC, and SC filters. |
| FST / FSR (Pins 14/7) | Transmit/receive frame sync | 8 kHz inputs synchronizing PCM data transfers; holding both low for multiple frames initiates power-down. |
| BCLKT / BCLKR (Pins 12/9) | Transmit/receive bit clock | 256–4096 kHz bit-rate control; BCLKR doubles as mode select (logic 0 = sign-extended, logic 1 = receive gain adjust). |
| DT / DR (Pins 13/8) | Transmit/receive serial data | PCM data I/O; DT is 3-state output; DR is input accepting 13-bit or 16-bit words depending on BCLKR state. |
Key Features
| Feature | Design Value |
|---|---|
| Fully-differential analog signal path | Doubles allowable input amplitude vs. single-ended designs and cancels common-mode supply noise, achieving >75 dB dynamic range and <1 LSB idle noise. |
| Integrated precision voltage reference | 0.886 V bandgap-derived reference ensures stable –5 dBm TLP at 600 Ω without external components or calibration. |
| Configurable transmit high-pass filter | 3rd-order 200 Hz HPF can be bypassed via HB pin, enabling DC-coupled input for non-telephony applications like audio monitoring. |
| Programmable receive gain control | 3-bit digital attenuation (0 to –21 dB in 3 dB steps) clocked into DR during receive gain-adjust mode, eliminating need for external PGA or DAC-controlled attenuators. |
| Push-pull 300 Ω power drivers | PO+/PO– outputs deliver 3.544 Vpp into 300 Ω; gain set externally via PI resistor network; independently power-downable by tying PI to VDD. |
| Multi-mode digital interface | Supports Long/Short Frame Sync, sign-bit extended (16-bit), and receive gain-adjust (16-bit with 3-bit control) - simplifies interoperability with diverse host processors and TDM controllers. |
Applications
| Telephony Line Interface | Voice over IP Gateway |
|---|---|
Use Scenario: Analog telephone line termination in central office or remote DSLAM equipment requiring compliance with ITU-T G.711 and echo cancellation support. IC Role / Device Role / Timing Role: Primary analog front-end codec performing A-law/μ-law compatible 8 kHz sampling, band-limiting, and reconstruction with precise –5 dBm TLP calibration. Use Value: Eliminates discrete op-amps, filters, and reference ICs while maintaining >75 dB SNR and meeting GR-909 harmonic distortion limits for Class 5 switch interfaces. |
Use Scenario: Voice digitization and playback in residential VoIP adapters connecting PSTN handsets to SIP-based networks. IC Role / Device Role / Timing Role: PCM codec interfacing electret microphone and speaker/headset with DSP or VoIP SoC via 8 kHz TDM bus. Use Value: Single-supply 3 V operation and 8 mW power dissipation enable compact, fanless adapter designs; VAG-referenced analog I/O reduces ground-loop noise in mixed-signal PCBs. |
| Digital Modem Front-End | Industrial Voice Alarm System |
Use Scenario: High-reliability V.34/V.90 modem design requiring robust analog conditioning for line probing, training, and data transmission over noisy copper pairs. IC Role / Device Role / Timing Role: Transmit/receive signal conditioner with programmable receive gain and HPF bypass for adaptive line characterization and equalization. Use Value: Differential architecture rejects common-mode noise from switching power supplies and RF ingress; 30 dB mic preamp gain supports low-output electret elements without external amplification. |
Use Scenario: Emergency voice announcement system in fire alarm panels or building management controllers requiring clear speech reproduction under EMI-heavy industrial environments. IC Role / Device Role / Timing Role: Voice digitizer and playback engine driving loudspeaker via integrated 300 Ω push-pull drivers with adjustable output level. Use Value: On-chip 3.544 Vpp driver output eliminates external power amp; receive gain control allows volume tuning per zone; power-down mode (<0.01 mW) supports battery backup operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PCM codec-filter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV320AIC10IDW | 16-bit sigma-delta ADC/DAC, 3.3 V supply, SPI/I²C control interface, no integrated HPF bypass or VAG reference | Requires external reference and filtering; suited for programmable audio systems rather than fixed-telephony TDM | Choose when digital configurability and higher resolution outweigh fixed-telephony optimization and analog integration. |
| CS44600-CQZ | 24-bit multi-channel delta-sigma codec, 5 V tolerant, I²S/PCM interface, no on-chip VAG or HPF bypass | Targeted at high-fidelity consumer audio; lacks telephony-specific features like 8 kHz frame sync and –5 dBm TLP calibration | Prefer for multi-channel, high-SNR audio applications where μ-law/G.711 compliance is not required. |
Compared with TLV320AIC10IDW and CS44600-CQZ, the MC145483FC delivers purpose-built telephony performance with integrated VAG reference, HPF bypass, and 8 kHz TDM timing-reducing BOM count and layout complexity in PSTN- and VoIP-facing designs-while offering lower power and tighter analog specification alignment with legacy voice infrastructure.
Availability
MC145483FC is available at Aetrix Electronics and suitable for telephony line interface, VoIP gateway, digital modem front-end, and industrial voice alarm system applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MC145483FC 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 MC145483FC belongs to Freescale's legacy voice codec product line, designed specifically for cost-sensitive, high-reliability telephony infrastructure requiring single-supply, low-power, and G.711-compliant analog front-end functionality.
FAQ
What is the function of the VAG and VAG Ref pins on the MC145483FC?
The VAG pin (Pin 32) provides a mid-supply analog ground (1.5 V) that serves as the reference for all internal analog circuitry in the MC145483FC. The VAG Ref pin (Pin 1) is used to bypass the internal VAG generator with a 0.1 µF capacitor to VSS. This decoupling stabilizes the reference voltage and minimizes clock feedthrough noise. During power-down, VAG becomes high-impedance and VAG Ref is pulled to VDD via a high-impedance path - both behaviors are intrinsic to the MC145483FC's power management architecture.
Does the MC145483FC support μ-law or A-law companding?
The MC145483FC is a 13-bit linear PCM codec-filter and does not perform on-chip μ-law or A-law companding. Its 13-bit linear output aligns with μ-law bit weighting for 0 dBm0 calibration (–5 dBm at 600 Ω), enabling seamless interface with external μ-law encoders or DSPs that handle companding. The MC145483FC's linear architecture preserves full dynamic range before compression, making it ideal as an analog front-end preceding software or hardware-based G.711 implementation.
How is the receive gain controlled on the MC145483FC?
Receive gain on the MC145483FC is controlled in the "receive gain adjust" mode, activated by setting BCLKR (Pin 9) to logic high. In this mode, three additional bits (bits 14–16) are clocked into the DR pin alongside the 13-bit voice data, selecting attenuation from 0 dB to –21 dB in 3 dB steps. This digital control eliminates the need for external analog attenuators or voltage-controlled amplifiers, and the gain setting is applied directly within the MC145483FC's receive signal path prior to the smoothing filter output.
Can the transmit high-pass filter be disabled on the MC145483FC?
Yes, the transmit high-pass filter on the MC145483FC can be disabled using the HB pin (Pin 16). Applying a logic high to HB bypasses the 3rd-order 200 Hz high-pass filter, extending the transmit frequency response down to DC. This feature supports applications such as audio monitoring, DC-coupled sensor interfaces, or non-telephony voice systems where 50/60 Hz rejection is unnecessary - a capability confirmed in the MC145483FC's functional description and pin documentation.
What package type does the MC145483FC use, and what are its thermal characteristics?
The MC145483FC uses a 32-pin QFN package (Case 1311) with an exposed thermal pad, optimized for low thermal resistance in compact voice interface designs. Its thermal performance supports continuous operation at ambient temperatures up to +85°C with appropriate PCB copper area under the thermal pad. The QFN footprint enables high-density routing and improved high-frequency noise immunity compared to SOG or SSOP variants - a mechanical specification explicitly assigned to the "FC" suffix in Freescale's ordering information.
MC145483FC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tray
- 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:
- 2.7V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-HVQFN (5x5)
MC145483FC FAQ
1.How can I place an order for MC145483FC through Aetrix?
Please submit a Request for Quotation (RFQ) for MC145483FC 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 MC145483FC reliable?
The price and inventory of MC145483FC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC145483FC is usually 5 days.
3.What payment methods are accepted for MC145483FC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC145483FC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC145483FC?
MC145483FC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC145483FC 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 MC145483FC?
For technical support, including MC145483FC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC145483FC requirements.
6.How does Aetrix verify that MC145483FC is sourced from the original manufacturer or authorized distributors?
All MC145483FC 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 MC145483FC meets industry standards.
7.What is the process for return or replacement of MC145483FC?
All MC145483FC units undergo pre-shipment inspection (PSI). If there is an issue with MC145483FC, 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 MC145483FC part is unused and in its original packaging.
Return procedure for MC145483FC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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