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NXP Semiconductors TEF6894H/V3,518
- Part No.:
- TEF6894H/V3,518
- Manufacturer:
- NXP Semiconductors
- Category:
- Audio Special Purpose
- Package:
- 44-QFP
- Datasheet:
-
TEF6894H/V3,518.pdf
- Description:
- IC AUDIO TONE PROCESSOR 44PQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,039
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Product details
Overview
TEF6894H/V3,518 from NXP Semiconductors (formerly Philips Semiconductors) is a monolithic BiMOS car radio integrated signal processor for FM/AM stereo decoding, weak signal processing, and ignition noise blanking. It delivers 40 dB channel separation, 75 dB S/N ratio, 0.3% THD in FM mode, and operates from 8–9 V supply. It serves as the central audio signal conditioning IC in automotive head units, interfacing directly with tuner ICs like TEA684x.
For engineers reviewing the TEF6894H/V3,518 datasheet, TEF6894H/V3,518 pinout, TEF6894H/V3,518 application, or TEF6894H/V3,518 equivalent, this page provides verified functional architecture, I²C-bus programmable control parameters (e.g., soft mute slope, USN/WAM detection thresholds), stereo decoder PLL timing, and real-world audio path specifications - all confirmed from the official 2003 Philips datasheet.
Technical Context
The TEF6894H/V3,518 integrates a 75.4 kHz reference-locked PLL stereo decoder with pilot cancellation, dual-path FM/AM noise blanking (sample-and-hold for FM, muting for AM), and multipath-aware weak signal logic using three parallel detectors: LEVEL (RF level), USN (ultrasonic noise on MPXRDS), and WAM (wideband AM on LEVEL). All detector outputs are digitized via an 8-bit ADC and exposed via I²C-bus.
Its tone/volume chain includes ASI-enabled volume/balance (−59 to +20 dB), treble/bass (±14 dB in 2 dB steps), fader/mute (0 to −59 dB), and NAV/beep mixing. De-emphasis is selectable between 50 µs and 75 µs; high-cut control offers eight static filter curves plus dynamic adjustment via AMFMHCC signal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 8.0–9.0 V - supports automotive battery range without external regulation |
| Channel separation | 40 dB at 1 kHz - ensures clean left/right channel isolation in stereo FM reception |
| S/N ratio | 75 dB (20 Hz–15 kHz) - enables high-fidelity audio output under low-signal conditions |
| THD | 0.3% max in FM mode - preserves audio fidelity across full volume range |
| I²C-bus speed | 400 kHz fast mode - allows real-time control of audio parameters during tuning |
| Volume control range | +20 to −79 dB in 1 dB steps - covers full dynamic range from line-level boost to deep mute |
| USN/WAM read-out | Digitized via 8-bit ADC and accessible over I²C - enables microcontroller-based signal quality monitoring |
Pinout & Package
TEF6894H/V3,518 uses a QFP44 package (SOT307-2), 10 × 10 × 1.75 mm body, 44 leads, 1.3 mm lead length. Pin functions are fully documented in Philips datasheet Section 6 (Pinning) and Fig.2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FMMPX (Pin 5) | FM-MPX input for audio processing | Main MPX signal path to stereo decoder; gain configurable in 4 settings including weather band mode |
| MPXRDS (Pin 6) | FM-MPX input for weak signal processing | Feeds 100 kHz high-pass filtered MPX to USN detector and noise blanker trigger logic |
| LEVEL (Pin 1) | Level detector input | Analog voltage representing RF signal strength; used by AM/FM weak signal logic and noise detectors |
| SCL / SDA (Pins 43/42) | I²C-bus interface | Standard 400 kHz bidirectional control bus; supports address selection via ADDR (Pin 44) |
| LFOUT / RFOUT / LROUT / RROUT (Pins 27–30) | Quad-channel audio outputs | Four independent analog outputs supporting front/rear fader and per-channel mute |
| NAV (Pin 32) | Navigation voice input | External mono audio source mixed into any output channel via internal mixer circuit |
Key Features
| Feature | Design Value |
|---|---|
| Audio Step Interpolation (ASI) | Programmable smoothing for volume, balance, bass, treble, fader, and mute transitions - eliminates audible pops during parameter changes |
| Gated I²C-bus loop-through | Reduces PCB crosstalk by routing tuner's I²C signals through TEF6894H/V3,518 - simplifies layout and supports mixed-speed bus operation |
| Dynamic weak signal response | Simultaneous USN, WAM, and LEVEL detection drives real-time soft mute, stereo blend (FMSNC), and high-cut control (AMFMHCC) |
| Integrated beep generator | Four programmable frequencies - provides UI feedback without external components or MCU audio resources |
| Weather band de-emphasis | Configurable 50/75 µs de-emphasis - supports both standard FM broadcast and NOAA weather band reception |
Applications
| Automotive FM/AM Head Unit | Telematics Audio Hub |
|---|---|
|
Use Scenario: Integrated infotainment system in passenger vehicles receiving terrestrial FM/AM broadcasts while suppressing engine ignition noise. IC Role / Device Role / Timing Role: Central signal processor handling stereo decoding, noise blanking, weak-signal adaptation, and multi-source audio routing. Use Value: Maintains listenable audio under poor RF conditions (e.g., tunnels, urban canyons) via real-time USN/WAM-triggered soft mute and stereo blend. |
Use Scenario: In-vehicle telematics platform combining navigation voice prompts (NAV input) with concurrent FM playback. IC Role / Device Role / Timing Role: Audio mixer and priority arbiter - overlays navigation announcements onto FM/CD audio with seamless crossfade via ASI. Use Value: Enables hands-free navigation without interrupting entertainment; NAV signal is mixed into any output channel without external op-amps or switches. |
| Aftermarket Radio Retrofit | Marine/RV Entertainment System |
|
Use Scenario: Compact aftermarket radio module requiring minimal external components and small PCB footprint. IC Role / Device Role / Timing Role: Single-chip replacement for legacy discrete audio chains - integrates input selector, tone controls, and 4-channel output drivers. Use Value: Reduces BOM count by eliminating 12+ passive filters, op-amps, and relays; QFP44 package fits tight space constraints. |
Use Scenario: Marine or RV audio system operating in electrically noisy environments with variable power supply (8–16 V). IC Role / Device Role / Timing Role: Robust signal conditioner with AM/FM noise blanking and wide-supply tolerance (8–9 V nominal, up to 10 V absolute max). Use Value: Suppresses alternator whine and RF interference from onboard electronics via dual-path blanking and PSRR >24 dB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar car radio signal processing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TEF6606T/V1,518 | Successor IC with digital IF input (I²S), integrated RDS decoder, and enhanced weak-signal algorithms; requires different tuner interface and firmware. | Designed for modern digital-tuner architectures; lacks analog MPX inputs and gated I²C loop-through. | Choose for new designs targeting higher integration and RDS support; not drop-in compatible due to signal path and pinout differences. |
| TEA6843 | Tuner companion IC - provides 75.4 kHz reference, AF hold, and RDS clock; does not perform audio processing. | Used alongside TEF6894H/V3,518 as a tuner-side partner, not a functional substitute. | Select only as a complementary component; cannot replace TEF6894H/V3,518's stereo decoding, tone control, or noise blanking functions. |
Compared with TEF6894H/V3,518, the TEF6606T/V1,518 shifts to digital baseband processing and adds RDS, while the TEA6843 serves only as a tuner interface - neither replicates the analog MPX signal conditioning, ASI-enabled fader/mute, or NAV mixing capabilities of the TEF6894H/V3,518 in legacy automotive radio designs.
Availability
TEF6894H/V3,518 is available at Aetrix Electronics and suitable for automotive infotainment systems, marine audio platforms, and aftermarket radio modules requiring stable component supply, long-lifecycle support, and proven analog signal integrity in harsh EMI environments.
Supply support for TEF6894H/V3,518 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
NXP Semiconductors acquired Philips Semiconductors in 2006 and maintains legacy automotive analog signal processing IP. The company specializes in secure, reliable semiconductor solutions for automotive, industrial, and IoT markets.
The TEF6894H/V3,518 belongs to Philips' legacy car radio signal processor family, designed specifically for analog FM/AM head units requiring high-immunity stereo decoding, ignition noise suppression, and flexible multi-source audio routing - before the industry transition to digital tuners and SoCs.
FAQ
What is the primary function of the TEF6894H/V3,518 in an automotive radio system?
The TEF6894H/V3,518 serves as the core analog signal processor in FM/AM car radios, performing stereo decoding, AM/FM noise blanking, multipath-aware weak signal adaptation, and full-featured tone/volume control. It interfaces directly with tuner ICs like TEA684x and delivers four-channel audio output with ASI-smoothed fader/mute - all within a single QFP44 package. Its design targets robustness in electrically noisy automotive environments.
Does the TEF6894H/V3,518 support RDS functionality?
No, the TEF6894H/V3,518 does not include an RDS decoder. It accepts MPX signals (FMMPX and MPXRDS) and provides AF hold (AFHOLD) and sample trigger (AFSAMP) pins to coordinate with external RDS-capable tuner ICs such as the TEA684x series. RDS data extraction and display must be handled by a separate microcontroller or dedicated RDS decoder IC.
How does the TEF6894H/V3,518 handle ignition noise in AM/FM reception?
The TEF6894H/V3,518 implements dual-path noise blanking: for FM, it uses a sample-and-hold circuit triggered by combined MPXRDS and LEVEL signals; for AM, it applies muting based on slew-rate detection of noise spikes on the AM input. Sensitivity of both blankers is programmable via I²C-bus subaddresses 5H (CSALIGN) and 6H (MULTIPATH), enabling calibration to vehicle-specific EMI profiles.
Can the TEF6894H/V3,518 be used with modern digital tuners?
The TEF6894H/V3,518 is designed for analog MPX inputs from traditional analog IF tuners (e.g., TEA684x) and does not accept digital IF streams (I²S, PCM). While it can coexist in hybrid systems where a digital tuner outputs analog MPX, its architecture - including 75.4 kHz reference locking and analog detector paths - is optimized for legacy tuner interfaces, not direct digital baseband processing.
What audio sources can be selected via the TEF6894H/V3,518 input selector?
The TEF6894H/V3,518 supports four input sources: two external stereo inputs (CDL/CDCM/CDR and TAPEL/PHCM/TAPER), one external mono input (PHONE/PHCM), and one internal stereo source (AM or FM audio routed internally). Selection is controlled via I²C-bus subaddress BH (INPUT and ASI), and all paths feed into the shared tone/volume processing chain with ASI-enabled switching.
TEF6894H/V3,518 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 44-QFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Audio Tone Processor
- Applications:
- Audio
- Number of Channels:
- 6
- Interface:
- I2C
- Voltage - Supply:
- 8V ~ 9V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Specifications:
- AM, FM
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
TEF6894H/V3,518 FAQ
1.How can I place an order for TEF6894H/V3,518 through Aetrix?
Please submit a Request for Quotation (RFQ) for TEF6894H/V3,518 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 TEF6894H/V3,518 reliable?
The price and inventory of TEF6894H/V3,518 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TEF6894H/V3,518 is usually 5 days.
3.What payment methods are accepted for TEF6894H/V3,518?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TEF6894H/V3,518 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TEF6894H/V3,518?
TEF6894H/V3,518 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TEF6894H/V3,518 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 TEF6894H/V3,518?
For technical support, including TEF6894H/V3,518 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TEF6894H/V3,518 requirements.
6.How does Aetrix verify that TEF6894H/V3,518 is sourced from the original manufacturer or authorized distributors?
All TEF6894H/V3,518 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 TEF6894H/V3,518 meets industry standards.
7.What is the process for return or replacement of TEF6894H/V3,518?
All TEF6894H/V3,518 units undergo pre-shipment inspection (PSI). If there is an issue with TEF6894H/V3,518, 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 TEF6894H/V3,518 part is unused and in its original packaging.
Return procedure for TEF6894H/V3,518:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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