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NXP Semiconductors MC145483SD
- Part No.:
- MC145483SD
- Manufacturer:
- NXP Semiconductors
- Category:
- CODECS
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MC145483SD.pdf
- Description:
- IC CODEC-FILTER PCM 3V 20-SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,083
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Product details
Overview
MC145483SD from Freescale Semiconductor is a 13-bit linear PCM codec-filter IC designed for voice digitization and reconstruction in digital telephony systems. It integrates differential analog signal processing, on-chip transmit band-pass (200–3400 Hz) and receive low-pass (3400 Hz) filters, 2's complement data interface, and a precision 0.886 V reference voltage. It operates from a single 3 V supply with 8 mW typical power dissipation and supports both synchronous and asynchronous clocking modes.
For engineers reviewing the MC145483SD datasheet, MC145483SD pinout, MC145483SD application, or MC145483SD equivalent, key selection considerations include its fully-differential analog architecture for >75 dB dynamic range, programmable receive gain control (0 to –21 dB), high-impedance VAG reference for noise-sensitive analog grounding, and compatibility with Long/Short Frame Sync PCM timing formats.
Technical Context
The MC145483SD implements a dual-path, fully-differential analog signal chain: the transmit path includes an input op amp (TI+/TI–), active R-C pre-filter, differential switched-capacitor band-pass filter (200–3400 Hz), and 13-bit linear ADC; the receive path uses a 13-bit linear DAC, sinX/X-compensated switched-capacitor low-pass filter, active R-C post-filter, and push-pull 300 Ω power drivers (PO+/PO–). All analog circuitry references the internal VAG mid-supply ground.
Its digital interface supports four operational modes-Long Frame Sync, Short Frame Sync, sign-bit extended, and receive gain-adjust-controlled via FST/FSR/BCLKT/BCLKR pins. The MCLK input (256 kHz–4.096 MHz) drives internal prescaling to generate a 256 kHz sequencing clock for ADC/DAC and filter operation, independent of data transfer mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 13-bit linear ADC/DAC with 2's complement output format |
| Supply Voltage | Single 3 V supply; enables low-power portable and line-powered telephony designs |
| Power Dissipation | 8 mW typical active; 0.01 mW in power-down mode via PDI or frame-sync hold |
| Analog Bandwidth | Transmit: 200–3400 Hz band-pass; Receive: 3400 Hz low-pass with sinX/X compensation |
| Reference Voltage | On-chip 0.886 V precision reference calibrated for –5 dBm TLP at 600 Ω |
| Digital Interface | Supports Long/Short Frame Sync; BCLKT/BCLKR up to 4096 kHz; 13-bit or 16-bit (gain-adjust) transfers |
| Dynamic Range | >75 dB; LSB ≈ 216 µV for small-signal audio fidelity |
| Idle Channel Noise | <1 LSB; enables high-fidelity voice coding without audible quantization artifacts |
Pinout & Package
The MC145483SD is housed in a 20-pin SSOP package (Case 940C), with lead pitch of 0.65 mm and body dimensions 7.2 mm × 5.3 mm. Pin assignments are validated per Freescale Semiconductor datasheet MC145483/D Rev 3 (2003).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 6) | Positive power supply | 3 V supply input; requires 0.1 µF ceramic decoupling to VSS for stable analog/digital operation |
| VSS (Pin 15) | Negative power supply / digital ground | 0 V reference for digital logic; separate from analog VAG to minimize supply coupling |
| VAG (Pin 20) | Analog ground output | Mid-supply (1.5 V) reference for all analog circuitry; high-impedance in power-down mode |
| VAG Ref (Pin 1) | Analog ground reference bypass | Capacitive bypass node for internal VAG generator; must be decoupled to VSS with 0.1 µF low-inductance trace |
| TG (Pin 17) | Transmit gain amplifier output | Drives transmit filter input; capable of 2 kΩ load; high-impedance when TI+ tied to VDD |
| RO– (Pin 2) | Receive analog output (inverting) | Buffered DAC output; drives 2 kΩ load to 0.886 V peak referenced to VAG |
| PO+/PO– (Pins 5/4) | Push-pull power amplifier outputs | Differential 300 Ω drivers delivering 3.544 Vpp; gain adjustable via external PI resistor network |
| PDI (Pin 10) | Power-down input | Logic low disables clocks and bias currents; places DT, RO–, PO+, PO–, TG, VAG in high-impedance state |
| HB (Pin 16) | Transmit high-pass filter bypass | Logic high disables 200 Hz high-pass stage, extending transmit response to DC for non-telephony applications |
| FST/FSR (Pins 14/7) | Transmit/receive frame sync | 8 kHz timing inputs; asynchronous operation supported; simultaneous low state enables auto power-down |
Key Features
| Feature | Design Value |
|---|---|
| Fully-differential analog design | Enables 2× signal swing vs. single-ended, cancels common-mode supply noise, and achieves >75 dB dynamic range |
| On-chip precision reference | 0.886 V bandgap-derived reference ensures consistent –5 dBm TLP calibration across temperature and supply variation |
| Programmable receive gain | 0 to –21 dB attenuation in 3 dB steps via 3-bit code clocked into DR during receive gain-adjust mode |
| Flexible clocking architecture | Auto-sensing MCLK (256 kHz–4.096 MHz) with internal prescaler eliminates external clock dividers |
| Hot-rack insertion robustness | Input protection on all pins and controlled power-up sequence prevent latch-up during live backplane insertion |
| Electret microphone interface support | Input op amp provides >30 dB gain with TI+/TI– configuration optimized for low-noise mic biasing |
Applications
| Telephony Line Card | DSP-Based Voice Gateway |
|---|---|
Use Scenario: Digitizing analog POTS line signals for VoIP packetization and transmission over IP networks. IC Role / Device Role / Timing Role: Analog front-end codec performing A/D conversion, anti-alias filtering, D/A reconstruction, and smoothing - synchronized to 8 kHz FST/FSR clocks. Use Value: Eliminates need for discrete op amps, filters, and references; meets ITU-T G.711 linearity and SNR requirements with single-chip integration. | Use Scenario: Providing high-fidelity analog I/O for DSP-based echo cancellation, compression, and transcoding in enterprise gateways. IC Role / Device Role / Timing Role: Low-noise, high-dynamic-range PCM interface between analog telephone lines and DSP serial ports (McBSP, HPI). Use Value: Differential architecture rejects switching noise from adjacent DSP; 13-bit resolution preserves voice quality through multiple encode/decode cycles. |
| Industrial Voice Recorder | Secure Communication Terminal |
Use Scenario: Capturing and storing voice messages in ruggedized field equipment with limited power budget. IC Role / Device Role / Timing Role: Standalone voice digitizer using internal VAG reference and power-down (PDI) for battery conservation between recordings. Use Value: 0.01 mW power-down current extends battery life; active R-C pre/post-filters suppress EMI in electrically noisy environments. | Use Scenario: Enabling encrypted voice transmission in military or government radios requiring tamper-resistant analog signal integrity. IC Role / Device Role / Timing Role: Secure analog I/O stage where differential signaling and isolated VAG/VAG Ref reduce side-channel leakage paths. Use Value: High PSRR (>60 dB) and common-mode rejection minimize RF injection into sensitive analog paths during RF transmission bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PCM codec applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC145504DW | 12-bit linear codec; no integrated VAG reference; requires external 2.5 V reference | Lacks differential analog path and onboard 0.886 V reference; lower dynamic range (~70 dB) | Choose when cost sensitivity outweighs need for highest voice fidelity and simplified analog layout |
| TP3067CP | 12-bit µ-law/A-law codec; fixed 2.048 MHz MCLK requirement; no receive gain adjust | Optimized for legacy T1/E1 framing; lacks programmable gain and DC-coupled transmit capability | Prefer for standard telecom line cards requiring µ-law compliance and minimal firmware overhead |
Compared with MC145483SD, MC145504DW offers lower integration and reduced noise immunity, while TP3067CP trades flexibility in clocking and gain control for strict µ-law interoperability - making MC145483SD optimal for custom voice systems demanding 13-bit linearity, DC-coupled operation, and adaptive gain.
Availability
MC145483SD is available at Aetrix Electronics and suitable for telephony infrastructure, DSP voice gateway, industrial voice recorder, and secure communication terminal applications requiring stable component supply and long-lifecycle support.
Supply support for MC145483SD 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 MC145483SD belongs to Freescale's legacy telephony analog front-end product line, engineered specifically for high-fidelity, low-power voice digitization in digital switching and packet-based communication systems.
FAQ
What is the function of the VAG and VAG Ref pins on the MC145483SD?
The VAG pin (Pin 20) outputs a mid-supply analog ground (1.5 V) that serves as the reference for all internal analog circuitry in the MC145483SD. The VAG Ref pin (Pin 1) is a dedicated bypass node for the internal VAG generator circuit and must be decoupled to VSS with a 0.1 µF ceramic capacitor using short, low-inductance traces. When the MC145483SD enters power-down mode, the VAG pin becomes high-impedance, and the VAG Ref pin is pulled to VDD via a high-impedance path.
Does the MC145483SD support DC-coupled analog input?
Yes, the MC145483SD supports DC-coupled analog input via the HB (high-pass bypass) pin (Pin 16). When HB is driven high, the internal 200 Hz third-order high-pass filter is disabled, allowing baseband signals including DC to pass through the transmit path. This capability makes the MC145483SD suitable for non-telephony applications such as voice logging or sensor signal conditioning where sub-200 Hz content must be preserved.
How does the receive gain adjustment feature work on the MC145483SD?
The MC145483SD implements receive gain adjustment by asserting a logic high on the BCLKR pin (Pin 9), which activates a 16-bit receive data mode. In this mode, bits 14–16 clocked into the DR pin control attenuation of the RO– output in 3 dB steps from 0 dB to –21 dB. The corresponding digital codes (000 to 111) map directly to attenuation values per Table 1 in the Freescale datasheet. This feature is exclusive to the MC145483SD and related variants - not available in earlier 12-bit codecs like the TP3067CP.
What are the power supply decoupling requirements for stable operation of the MC145483SD?
Stable operation of the MC145483SD requires three dedicated decoupling capacitors: a 0.1 µF ceramic capacitor between VDD (Pin 6) and VSS (Pin 15); a 0.1 µF ceramic capacitor between VAG Ref (Pin 1) and VSS; and a 0.01 µF ceramic capacitor between VAG (Pin 20) and VSS. All capacitors must be placed with minimal trace length and low inductance. Failure to properly decouple VAG Ref degrades PSRR and introduces clock feedthrough into the analog signal path of the MC145483SD.
Can the MC145483SD operate with asynchronous transmit and receive clocks?
Yes, the MC145483SD supports fully asynchronous operation between transmit and receive paths. The FST (Pin 14) and FSR (Pin 7) frame sync inputs may run at independent 8 kHz phases, and BCLKT (Pin 12) and BCLKR (Pin 9) may operate at different frequencies within the 256–4096 kHz range. This capability is explicitly confirmed in the "Digital I/O" section of the MC145483/D datasheet and enables flexible system-level clock domain bridging without requiring clock synchronization hardware for the MC145483SD.
MC145483SD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm 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:
- 2.7V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
MC145483SD FAQ
1.How can I place an order for MC145483SD through Aetrix?
Please submit a Request for Quotation (RFQ) for MC145483SD 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 MC145483SD reliable?
The price and inventory of MC145483SD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC145483SD is usually 5 days.
3.What payment methods are accepted for MC145483SD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC145483SD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC145483SD?
MC145483SD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC145483SD 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 MC145483SD?
For technical support, including MC145483SD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC145483SD requirements.
6.How does Aetrix verify that MC145483SD is sourced from the original manufacturer or authorized distributors?
All MC145483SD 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 MC145483SD meets industry standards.
7.What is the process for return or replacement of MC145483SD?
All MC145483SD units undergo pre-shipment inspection (PSI). If there is an issue with MC145483SD, 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 MC145483SD part is unused and in its original packaging.
Return procedure for MC145483SD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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