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STMicroelectronics TDA7708
- Part No.:
- TDA7708
- Manufacturer:
- STMicroelectronics
- Category:
- RF Receivers
- Package:
- 64-VFQFN Exposed Pad
- Datasheet:
-
TDA7708.pdf
- Description:
- RF RX AM/FM/RDS 108MHZ 64VFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:1,536
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Product details
Overview
TDA7708 from STMicroelectronics is an AEC-Q100-qualified, single-chip automotive-grade AM/FM tuner IC with integrated low-IF DSP architecture, 36.864 MHz crystal oscillator interface, RDS demodulation, HD-Radio™/DRM compatibility, and I²S digital audio output. It serves as the complete RF front-end and baseband processor in car radio head units.
For engineers reviewing the TDA7708 datasheet, TDA7708 pinout, TDA7708 application, or TDA7708 equivalent, key selection criteria include its 3.3 V supply operation, -40 °C to +85 °C ambient range, VFQFPN64 package footprint, multipath noise mitigation capability, and co-processor dependency for HD-Radio™ decoding.
Technical Context
The TDA7708 implements a low-IF, DSP-based receiver architecture with on-chip quadrature ADC (very high dynamic range), integrated PLL/VCO, and programmable AGC across AM LW/MW/SW and full FM bands. It digitizes phase-quadrature IF signals for real-time baseband processing including RDS group/block synchronization and multipath noise mitigation.
It supports three broadcast standards simultaneously via configurable digital interfaces: native AM/FM demodulation, HD-Radio™ channel filtering (requiring external STA680 decoder), and DRM reception (paired with STA660DRM). All signal paths operate under 3.3 V supply with junction temperature up to 125 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.15–3.45 V - ensures stable operation with standard automotive 3.3 V LDOs and tolerates rail droop during cold-crank conditions. |
| Ambient Temp Range | -40 °C to +85 °C - meets full automotive cabin environmental requirements without derating. |
| Supply Current | ≤350 mA at 108 MHz FM - defines thermal budget for PCB layout and heatsinking in sealed head unit enclosures. |
| Dissipated Power | ≤1 W - enables use of VFQFPN64 without external heatsink under JEDEC multilayer board conditions. |
| ESD Rating | ±2000 V HBM - provides robustness against assembly handling and in-vehicle ESD events on all pins except AM_IN. |
| ADC Dynamic Range | Very high - enables >90 dB SNR in multipath urban environments without analog gain staging. |
| Crystal Frequency | 36.864 MHz - precisely matches HD-Radio™ symbol timing and enables deterministic DSP sample alignment. |
Pinout & Package
VFQFPN64 (9 × 9 × 1.0 mm) package with exposed thermal pad; RoHS-compliant, MSL Level 3, JEDEC J-STD-020D compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC / GND | Power supply and ground rails | Dedicated VCC/GND pairs per quadrant minimize PSRR degradation and enable clean analog/digital domain separation. |
| AM_IN / FM_IN | Differential RF inputs | Accepts 50 Ω single-ended signals via on-chip balun; AM_IN rated for ±1000 V ESD, FM_IN for ±2000 V. |
| XTAL_IN / XTAL_OUT | 36.864 MHz crystal oscillator interface | Drives fundamental-mode crystal; internal load caps eliminate need for external tuning capacitors. |
| I²S_DOUT / I²S_BCLK / I²S_WCLK | Digital audio output interface | Delivers left/right PCM data at 256×Fs; compatible with standard audio SoCs without format translation. |
| I²C_SCL / I²C_SDA | Configuration and control bus | Supports multi-master I²C up to 400 kHz; allows runtime band switching, AGC tuning, and RDS parameter readback. |
| HDRI_IN / HDRI_OUT | HD-Radio™ baseband interface | Transfers filtered complex samples to STA680; requires external 1.8 V supply and level-shifting for co-processor sync. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated RDS demodulator | Performs full RDS group type decoding, block synchronization, and error correction without host MCU intervention. |
| Multipath noise mitigation | Real-time adaptive FIR filtering in DSP core reduces flutter and distortion in urban driving scenarios. |
| Low-IF DSP architecture | Eliminates image-reject filters and IF transformers, reducing BOM count by ≥7 passive components vs. superheterodyne designs. |
| Automotive qualification | AEC-Q100 Grade 2 compliance verified across temperature, vibration, and ESD stress profiles per automotive OEM requirements. |
| Small footprint integration | VFQFPN64 package occupies <81 mm² PCB area - fits within tight space constraints of modern double-DIN head unit layouts. |
Applications
| Automotive Infotainment Head Unit | HD-Radio™-Enabled Car Stereo |
|---|---|
Use Scenario: Integrated radio module in OEM dashboard systems requiring AEC-Q100 compliance and CAN-linked UI updates. IC Role / Device Role / Timing Role: Primary AM/FM tuner and digital baseband processor; provides I²S audio and RDS metadata to main SoC. Use Value: Eliminates discrete IF filter banks and analog demodulators, reducing total solution size by 35% and improving thermal stability over temperature. | Use Scenario: Aftermarket stereo upgrade supporting hybrid analog/digital broadcast with legacy antenna compatibility. IC Role / Device Role / Timing Role: HD-Radio™ channel filter and sample rate converter; synchronizes with STA680 decoder via HDRI interface. Use Value: Enables seamless fallback between HD and analog modes using same RF front-end, avoiding dual-tuner complexity and cost. |
| DRM Radio Receiver | Commercial Fleet Communication Terminal |
Use Scenario: Portable DRM shortwave receiver for maritime or remote-area broadcasting with battery-powered operation. IC Role / Device Role / Timing Role: Full-band AM SW/LW/MW tuner with DRM baseband pre-processing; outputs decoded audio via I²S. Use Value: Supports long-range DRM reception down to 3 MHz with built-in AGC and multipath rejection-no external LNAs required. | Use Scenario: Ruggedized vehicle-mounted terminal for public safety dispatch with simultaneous AM/FM monitoring and alert tone injection. IC Role / Device Role / Timing Role: Dual-band tuner with RDS traffic announcement (TA) and traffic program (TP) flag detection. Use Value: Delivers real-time TA/TP metadata over I²C, enabling automatic audio muting and priority alert routing without host CPU polling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar AM/FM tuner applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si4790x series (Skyworks) | Software-defined architecture with wider frequency coverage (150 kHz–30 MHz); no HD-Radio™ filtering; requires external crystal. | Supports SW/LW/AM/FM but lacks native HD-Radio™ channel filter; uses proprietary C2 programming interface. | Select when flexibility across global broadcast bands and field-upgradable firmware are prioritized over HD-Radio™ integration. |
| MAX2175 (Maxim) | Direct-conversion RF-to-bits tuner; 24-bit ADC; supports I²S and TDM; no integrated RDS or HD-Radio™ logic. | Requires full host-side RDS/HD-Radio™ stack; optimized for low-power portable radios, not automotive thermal envelope. | Select for battery-powered portable radios where power efficiency (<150 mA) outweighs automotive qualification and feature integration. |
Compared with Si4790x and MAX2175, the TDA7708 uniquely integrates HD-Radio™ channel filtering, automotive-grade reliability, and RDS hardware acceleration-reducing host MCU load and eliminating external IF components required by alternatives.
Availability
TDA7708 is available at Aetrix Electronics and suitable for automotive infotainment head units, HD-Radio™-enabled car stereos, and commercial fleet communication terminals requiring stable component supply across extended product lifecycles.
Supply support for TDA7708 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 microcontrollers, power ICs, sensors, and analog/mixed-signal products for automotive, industrial, and consumer markets.
The TDA7708 belongs to ST's automotive radio tuner product line, engineered specifically to consolidate AM/FM/HD-Radio™/DRM functionality into a single AEC-Q100-qualified die-targeting cost-sensitive, space-constrained, and thermally demanding automotive audio platforms.
FAQ
Does the TDA7708 require an external microcontroller to operate?
Yes - the TDA7708 requires configuration via I²C for band selection, AGC settings, and RDS enablement. It does not contain embedded firmware for autonomous operation. The TDA7708CB variant needs a small boot firmware download (under 4 kB) from host MCU before initialization.
Can the TDA7708 decode HD-Radio™ signals without additional components?
No - the TDA7708 performs HD-Radio™ channel filtering and baseband sampling only. Full HD-Radio™ decoding requires the external STA680 co-processor, which handles OFDM demodulation, Reed-Solomon decoding, and audio reconstruction.
What is the role of the 36.864 MHz crystal in the TDA7708 system?
The 36.864 MHz crystal sets the master clock for the internal PLL, ADC sampling, and DSP timing. Its exact frequency aligns with HD-Radio™ symbol rate (1.28 Msps × 28.8 = 36.864 MHz), ensuring deterministic sample-phase coherence between tuner and STA680 decoder.
Is the VFQFPN64 package thermally adequate for continuous automotive operation?
Yes - with Rth j-amb = 27 °C/W on a JEDEC 2s2p multilayer board and max dissipation ≤1 W, junction temperature stays below 125 °C at 85 °C ambient, satisfying AEC-Q100 thermal limits without forced airflow or heatsinks.
TDA7708 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 64-VFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Frequency:
- 108MHz
- Sensitivity:
- -
- Data Rate (Max):
- -
- Modulation or Protocol:
- AM, FM, RDS, SW-LW
- Applications:
- -
- Current - Receiving:
- 350mA
- Data Interface:
- -
- Memory Size:
- -
- Antenna Connector:
- -
- Features:
- -
- Voltage - Supply:
- 3.15V ~ 3.45V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-VFQFPN (9x9)
TDA7708 FAQ
1.How can I place an order for TDA7708 through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7708 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 TDA7708 reliable?
The price and inventory of TDA7708 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7708 is usually 5 days.
3.What payment methods are accepted for TDA7708?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7708 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7708?
TDA7708 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7708 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 TDA7708?
For technical support, including TDA7708 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7708 requirements.
6.How does Aetrix verify that TDA7708 is sourced from the original manufacturer or authorized distributors?
All TDA7708 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 TDA7708 meets industry standards.
7.What is the process for return or replacement of TDA7708?
All TDA7708 units undergo pre-shipment inspection (PSI). If there is an issue with TDA7708, 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 TDA7708 part is unused and in its original packaging.
Return procedure for TDA7708:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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