My Inquiry
My Account
STMicroelectronics TDA7479AD
- Part No.:
- TDA7479AD
- Manufacturer:
- STMicroelectronics
- Category:
- RF Demodulators
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TDA7479AD.pdf
- Description:
- RF DEMODULATOR IC 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,832
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TDA7479AD from STMicroelectronics is a single-chip RDS (Radio Data System) demodulator and 57 kHz bandpass filter for FM radio receivers, compliant with EBU specifications. It integrates an 8th-order switched-capacitor bandpass filter, fully digital RDS demodulation, 4.332 MHz crystal oscillator, ARI indication, and RDS signal quality output - all in a TSSOP16 package operating from 4.5–5.5 V supply.
For engineers reviewing the TDA7479AD datasheet, TDA7479AD pinout, TDA7479AD application, or TDA7479AD equivalent, this device serves as a complete, component-free RDS baseband recovery solution requiring no external filter components, no analog demodulation stages, and minimal board space in automotive and consumer FM tuners.
Technical Context
The TDA7479AD implements a two-stage signal path: first, a cascaded antialiasing + 8th-order SC bandpass filter precisely selects the 57 kHz RDS subcarrier with 3 kHz bandwidth and 20 dB gain; second, a digital PLL-based biphase demodulator recovers RDDA data and 1187.5 Hz RDCL clock synchronized to incoming MPX signals.
Its oscillator architecture supports three crystal frequencies (4.332/8.664/17.328 MHz) via FSEL pin configuration, while OSEL enables external clock drive with ≤120 mVpp input - reducing EMI and enabling system-level clock synchronization without internal oscillator radiation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Filter center frequency | 57 kHz ±0.5 kHz - ensures precise alignment with EBU RDS subcarrier standard |
| Filter bandwidth (3 dB) | 3 kHz typical - rejects adjacent 19 kHz stereo pilot and 67 kHz SCA interference |
| RDS detection sensitivity | 1 mVRMS at MPX input - enables reliable decoding under weak-signal FM conditions |
| Supply voltage range | 4.5–5.5 V - compatible with standard 5 V automotive and consumer power rails |
| Supply current | 11 mA typical at 5 V - supports low-power tuner designs without thermal derating |
| Output clock frequency | 1187.5 Hz on RDCL - matches RDS Group Clock timing for synchronous decoder interfacing |
| Signal-to-noise ratio | 40 dB typical at 3 mVRMS input - maintains data integrity in noisy RF environments |
Pinout & Package
Package: TSSOP16 (ECOPACK®, lead-free, 5.0 mm × 6.4 mm body, 0.65 mm pitch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 QUAL | RDS signal quality indicator | Open-drain high-impedance output; logic high = valid RDS lock and stable data stream |
| 2 RDDA | RDS data output | CMOS-level serial biphase data stream synchronized to RDCL falling/rising edge |
| 4 MPX | RDS subcarrier input | Differential-capable input (120 kΩ impedance) accepting composite FM multiplex signal |
| 7 ARI | ARI (Announcement Ready Indicator) output | Logic high when ARI flag is active in RDS group or standalone ARI transmission present |
| 8 FILOUT | Filtered 57 kHz output | Internal bandpass filter output - usable for diagnostic monitoring or alternative demod paths |
| 9 FSEL | Crystal frequency select | Configures oscillator division ratio: open = 4.332 MHz, VS = 8.664 MHz, GND = 17.328 MHz |
| 11 EXTRES | Reset control | Active-high reset; open = normal operation, pulled to VS = forced reset condition |
| 12 VS | Power supply | Primary 4.5–5.5 V supply rail with internal regulation for analog/digital sections |
| 16 RDCL | RDS clock output | 1187.5 Hz CMOS clock with 416.7 µs data hold time after each edge for decoder setup |
Key Features
| Feature | Design Value |
|---|---|
| Purely digital RDS demodulation | Eliminates external analog filters, op-amps, and PLL ICs - reduces BOM count by ≥6 passive/active components |
| 8th-order SC bandpass filter | Provides sharp 57 kHz selectivity (22 dB attenuation at ±4 kHz) without trimming or calibration |
| No external filter components required | Enables full RDS recovery in <12 mm² PCB area - critical for space-constrained car audio modules |
| Configurable oscillator interface | Supports internal crystal (4.332/8.664/17.328 MHz) or low-amplitude external drive (≤120 mVpp) for EMI-sensitive systems |
| ARI + QUAL status outputs | Provides real-time RDS subsystem health feedback to host MCU without parsing full RDS data stream |
Applications
| Automotive FM Tuner Modules | Aftermarket Car Stereo Receivers |
|---|---|
Use Scenario: Integrated RDS decoding in OEM head units where space, EMI, and supply stability are constrained. IC Role / Device Role / Timing Role: Primary RDS baseband recovery IC - extracts RDDA and RDCL from MPX for microcontroller-based RDS group parsing. Use Value: Enables display of station name (PS), program type (PTY), and traffic announcements (TA) using only one IC and zero external filter passives. | Use Scenario: Cost-sensitive aftermarket radios needing drop-in RDS capability without redesigning analog front-end. IC Role / Device Role / Timing Role: Standalone RDS demodulator interfaced to legacy stereo decoder ICs via MPX injection and TTL-level RDDA/RDCL. Use Value: Adds EBU-compliant RDS support with <2 ms latency and no firmware changes to existing decoder logic. |
| Portable FM Radio Reference Designs | FM Broadcast Monitoring Equipment |
Use Scenario: Battery-powered portable radios requiring low quiescent current and minimal external components. IC Role / Device Role / Timing Role: Low-power RDS engine operating at 11 mA - paired with sleep-mode MCU to extend battery life during standby. Use Value: Achieves 50+ hours runtime on AA batteries while maintaining RDS lock during channel scanning and weak-signal reception. | Use Scenario: Field-deployable RDS signal analyzers verifying broadcast station compliance with EBU RDS Annex C. IC Role / Device Role / Timing Role: Precision 57 kHz filter + demodulator reference stage - feeds clean RDDA to FPGA-based group parser and error rate counter. Use Value: Provides traceable 57 kHz amplitude/phase response (±0.1 dB flatness, <1° jitter) for metrology-grade validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RDS demodulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDA7479D | SO16 package (vs. TSSOP16); 200°C/W junction-to-case thermal resistance (vs. 160°C/W) | Preferred for through-hole prototyping or high-temperature industrial enclosures with heatsinking | Select when board assembly uses wave soldering or thermal mass exceeds 40°C/W ambient rise |
| Si4702-C10 | Integrated FM tuner + RDS demodulator (vs. baseband-only TDA7479AD); requires external LNA/IF filter | Reduces total IC count but mandates redesign of RF front-end and antenna matching network | Select only when migrating from discrete tuner architectures to fully integrated radio SoC |
Compared with TDA7479D, the AD variant offers superior thermal performance and smaller footprint for surface-mount production; compared with Si4702-C10, it preserves existing MPX-level integration without RF redesign but requires separate FM IF processing.
Availability
TDA7479AD is available at Aetrix Electronics and suitable for automotive infotainment systems, aftermarket stereo receivers, portable FM radios, and broadcast monitoring equipment requiring stable component supply across multi-year production cycles.
Supply support for TDA7479AD 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, mixed-signal, power, and microcontroller solutions for industrial, automotive, and consumer markets.
The TDA7479AD belongs to ST's audio signal processing product line, engineered specifically for EBU-compliant RDS demodulation in cost-sensitive, space-constrained FM receiver applications - emphasizing integration, low EMI, and zero external filter dependency.
FAQ
What crystal frequency is required for standard RDS operation?
The TDA7479AD defaults to 4.332 MHz crystal frequency when FSEL is left open, which divides internally to generate the precise 57 kHz bandpass center and 1187.5 Hz RDS clock. This value is specified in EBU RDS Annex B and ensures full compatibility with broadcast station transmissions across Europe and Asia.
Can the TDA7479AD operate with an external 57 kHz clock instead of a crystal?
No - the device does not accept 57 kHz directly. However, it supports external sinusoidal clock injection at OSCIN (pin 13) when OSEL is tied to GND, with frequencies of 4.332 MHz, 8.664 MHz, or 17.328 MHz and amplitude as low as 100 mVpp, enabling system-level clock synchronization.
How is RDS data validity timed relative to the RDCL clock?
Data on RDDA remains valid for 416.7 µs after each RDCL clock transition (rising or falling edge), per internal PLL lock behavior. The decoder must sample RDDA within this window - setup time is not specified, so edge-triggered latching on the opposite edge is recommended for robust capture.
Does the TDA7479AD support RDS-TMC (Traffic Message Channel)?
Yes - the device recovers raw RDS biphase data (RDDA) and clock (RDCL) compliant with EBU RDS standards, including Group Type 8A used for TMC. Full TMC decoding requires external microcontroller firmware implementing EN 50067 Annex D, but the TDA7479AD provides bit-accurate, jitter-controlled input for that processing.
TDA7479AD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Demodulator, Filter
- LO Frequency:
- -
- RF Frequency:
- -
- P1dB:
- -
- Gain:
- -
- Noise Figure:
- -
- Current - Supply:
- 11 mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
TDA7479AD FAQ
1.How can I place an order for TDA7479AD through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7479AD 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 TDA7479AD reliable?
The price and inventory of TDA7479AD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7479AD is usually 5 days.
3.What payment methods are accepted for TDA7479AD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7479AD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7479AD?
TDA7479AD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7479AD 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 TDA7479AD?
For technical support, including TDA7479AD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7479AD requirements.
6.How does Aetrix verify that TDA7479AD is sourced from the original manufacturer or authorized distributors?
All TDA7479AD 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 TDA7479AD meets industry standards.
7.What is the process for return or replacement of TDA7479AD?
All TDA7479AD units undergo pre-shipment inspection (PSI). If there is an issue with TDA7479AD, 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 TDA7479AD part is unused and in its original packaging.
Return procedure for TDA7479AD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TDA7479AD Tags
-
ADL5387ACPZ-R7
Analog Devices Inc.
-
ADL5380ACPZ-R7
Analog Devices Inc.
-
LTC5584IUF#TRPBF
Analog Devices Inc.
-
LTC5584IUF#PBF
Analog Devices Inc.
-
AD8348ARUZ-REEL7
Analog Devices Inc.
-
LT5575EUF#PBF
Analog Devices Inc.
-
LTC5586IUH#TRPBF
Analog Devices Inc.
-
HMC908ALC5
Analog Devices Inc.
-
LMX8410RGZT
Texas Instruments
-
AD8347ARUZ
Analog Devices Inc.
-
ADL5382ACPZ-R7
Analog Devices Inc.
-
AD8348ARUZ
Analog Devices Inc.
Tech Hub
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
