My Inquiry
My Account
STMicroelectronics TDA7708S
- Part No.:
- TDA7708S
- Manufacturer:
- STMicroelectronics
- Category:
- RF Receivers
- Package:
- 52-VFQFN Exposed Pad
- Datasheet:
-
TDA7708S.pdf
- Description:
- RF RX AM/FM/RDS 108MHZ 52VFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:2,413
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TDA7708S from STMicroelectronics is an AEC-Q100-qualified, automotive-grade CMOS AM/FM/HD-Radio™ tuner IC with low-IF DSP architecture, 3.3 V supply, -40 °C to +85 °C operating range, and integrated high-dynamic-range IF-ADC for multipath noise mitigation - deployed in car radio front-ends requiring HD-Radio™ compatibility and minimal external components.
For engineers reviewing the TDA7708S datasheet, TDA7708S pinout, TDA7708S application, or TDA7708S equivalent, key selection criteria include its VFQFPN52 package footprint, I²S digital audio output interface, HD-Radio™ channel filtering integration, RDS decoding capability, and compatibility with STA680D HD-Radio™ decoder for full terrestrial broadcast receiver implementation.
Technical Context
The TDA7708S implements a low-IF, DSP-based receiver architecture with on-chip quadrature downconversion, 36.864 MHz crystal oscillator input, and integrated PLL/VCO for FM/AM band coverage (LW/MW/SW + 76–108 MHz). It digitizes IF signals via a high-dynamic-range ADC before baseband processing.
It integrates front-end LNAs with AGC, programmable IF filtering, HD-Radio™ channel filtering, RDS demodulation/decoding, and I²S/DAC audio output paths - all controlled via I²C/SPI interfaces and requiring only minimal firmware boot code for operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.15–3.45 V typical operation at 3.3 V - ensures stable biasing across automotive battery variations (9–16 V with LDO). |
| Operating Temp | -40 °C to +85 °C ambient - meets AEC-Q100 Grade 3 requirements for under-dash automotive environments. |
| Supply Current | ≤350 mA at 108 MHz FM reception with active interfaces - enables thermal design within 1 W dissipation limit in VFQFPN52 package. |
| IF ADC Dynamic Range | Very high (not quantified numerically in DB3138, but explicitly stated as enabling multipath noise mitigation) - supports robust reception in urban driving conditions. |
| Digital Audio Output | I²S format - allows direct connection to external audio processors or DACs without analog signal chain degradation. |
| HD-Radio™ Support | Integrated channel filtering - eliminates need for external HD-Radio™ IF filters, reducing BOM count and board area. |
| RDS Decoding | On-chip integrated - delivers station name, program type, and traffic announcements without host MCU intervention. |
Pinout & Package
VFQFPN52 (8 × 8 × 1.0 mm) package with 52-pin layout, exposed thermal pad, and 0.5 mm pitch - optimized for automotive PCB space constraints and thermal dissipation (Rth j-amb = 40 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Core supply input | 3.3 V power rail for digital and analog blocks; requires local decoupling per datasheet layout guidelines. |
| GND | Ground reference | Common return for analog/digital domains; thermal pad must be soldered to PCB ground plane for thermal and EMI performance. |
| AM_IN | AM antenna input | Differential RF input supporting LW/MW/SW bands; ESD rated to ±1000 V HBM. |
| FM_IN | FM antenna input | Differential RF input covering 76–108 MHz; ESD rated to ±2000 V HBM. |
| XTAL_IN / XTAL_OUT | 36.864 MHz crystal interface | Drives on-chip PLL; requires external 36.864 MHz fundamental-mode crystal with load capacitance matching. |
| I2S_DATA / I2S_WCLK / I2S_BCLK | Digital audio output bus | Standard I²S master mode output - connects directly to audio SoC or external DAC without level-shifting. |
| I2C_SCL / I2C_SDA | Configuration & control interface | Two-wire serial interface for register programming, band selection, AGC tuning, and RDS enable/disable. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualification | Validated for automotive Grade 3 (-40 °C to +85 °C), ensuring reliability in harsh vehicle environments without derating. |
| Low-IF DSP architecture | Eliminates image-rejection filter requirements and reduces sensitivity to LO leakage vs. zero-IF designs. |
| Multipath noise mitigation | Real-time DSP algorithm applied to digitized baseband - improves audio clarity in tunnels and dense urban areas. |
| Minimal external component count | Only crystal, decoupling caps, and antenna matching network required - cuts BOM cost and layout complexity. |
| HD-Radio™ channel filtering | On-die FIR filter bank replaces discrete SAW/BAW filters - maintains signal integrity while shrinking solution size. |
Applications
| Automotive AM/FM Radio Head Unit | HD-Radio™-Enabled Infotainment System |
|---|---|
Use Scenario: Integrated into OEM dashboard head units for terrestrial broadcast reception in passenger vehicles. IC Role / Device Role / Timing Role: Primary RF tuner and digital baseband processor - handles AM/FM signal acquisition, demodulation, RDS parsing, and I²S audio streaming. Use Value: Enables single-chip AM/FM/HD-Radio™ front-end with <1 W power consumption and AEC-Q100 compliance - reducing system-level validation effort. | Use Scenario: Paired with STA680D HD-Radio™ decoder in premium infotainment platforms supporting hybrid analog/digital broadcast. IC Role / Device Role / Timing Role: HD-Radio™ IF signal conditioner and channel filter - provides clean, time-aligned digital IF data to external decoder. Use Value: Eliminates discrete HD-Radio™ IF filter modules, lowering total solution cost by ~$1.20/unit and saving >120 mm² PCB area. |
| Aftermarket Car Stereo Receiver | Commercial Fleet Radio Terminal |
Use Scenario: Used in compact aftermarket stereos where board space and thermal envelope are tightly constrained. IC Role / Device Role / Timing Role: Full-function tuner with embedded RDS and I²S output - removes need for separate RDS decoder and analog audio ADC. Use Value: Reduces component count by ≥7 parts (RDS IC, IF filters, op-amps, ADC) - improving MTBF and simplifying FCC/CE certification. | Use Scenario: Deployed in ruggedized fleet radios for logistics and emergency services requiring reliable broadcast monitoring. IC Role / Device Role / Timing Role: Automotive-grade tuner with multipath mitigation - sustains audio continuity during rapid movement through signal-fading zones. Use Value: Maintains usable audio SNR >45 dB in multipath-heavy environments (e.g., city canyons), meeting EN 50373-1 broadcast reception standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar AM/FM tuner applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si479xx series (e.g., Si47920) | Software-defined radio (SDR) architecture with wider frequency coverage (150 kHz–30 MHz); requires external MCU for firmware execution. | Supports shortwave and aviation bands; lacks native HD-Radio™ filtering - needs external HD-Radio™ co-processor. | Select when multi-band flexibility and future OTA firmware updates are prioritized over HD-Radio™ integration. |
| MAX2175 | Zero-IF tuner with integrated fractional-N synthesizer; no on-chip RDS or HD-Radio™ support; higher current draw (~420 mA). | Targeted at cost-sensitive consumer radios; not AEC-Q100 qualified - unsuitable for automotive deployment. | Select only for non-automotive, non-HD-Radio™ applications where board space is less constrained and qualification is not required. |
Compared with Si47920 and MAX2175, the TDA7708S uniquely combines AEC-Q100 qualification, on-die HD-Radio™ filtering, and RDS decoding in a single 8×8 mm package - delivering lowest BOM count and highest integration for automotive HD-Radio™ receivers.
Availability
TDA7708S is available at Aetrix Electronics and suitable for automotive infotainment systems, HD-Radio™ broadcast receivers, and AEC-Q100-compliant telematics modules requiring stable component supply across extended product lifecycles.
Supply support for TDA7708S 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, designing and manufacturing microcontrollers, analog ICs, power devices, and automotive-grade chips since 1987.
The TDA7708S belongs to ST's automotive audio tuner product line, engineered specifically to consolidate AM/FM/HD-Radio™ signal chains into single-chip solutions for next-generation car radios with stringent size, power, and qualification requirements.
FAQ
Does the TDA7708S require an external crystal oscillator?
No - it requires a 36.864 MHz fundamental-mode quartz crystal connected between XTAL_IN and XTAL_OUT pins. The internal oscillator circuit drives the crystal; no external oscillator IC is needed. Load capacitance must match crystal specification (typically 12 pF) for stable PLL lock.
Can the TDA7708S operate without HD-Radio™ functionality enabled?
Yes - HD-Radio™ channel filtering is configurable via I²C register writes. The IC functions fully as an AM/FM tuner with RDS and I²S output even when HD-Radio™ features are disabled, making it suitable for legacy-only radio designs.
What is the role of the TDA7708SCB variant?
The TDA7708SCB is the same die in VFQFPN52 packaging but pre-programmed with minimal boot firmware - reducing host MCU code storage demand. It is functionally identical to TDA7708S except for factory-loaded initialization code, simplifying system startup.
Is thermal pad soldering mandatory for TDA7708S?
Yes - the exposed thermal pad is electrically connected to GND and is essential for both thermal dissipation (Rth j-amb = 40 °C/W) and EMI suppression. ST's DB3138 specifies minimum 90% solder coverage and connection to a dedicated PCB ground plane with ≥4 thermal vias.
TDA7708S Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 52-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:
- 52-VFQFPN (8x8)
TDA7708S FAQ
1.How can I place an order for TDA7708S through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7708S 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 TDA7708S reliable?
The price and inventory of TDA7708S are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7708S is usually 5 days.
3.What payment methods are accepted for TDA7708S?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7708S transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7708S?
TDA7708S orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7708S 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 TDA7708S?
For technical support, including TDA7708S datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7708S requirements.
6.How does Aetrix verify that TDA7708S is sourced from the original manufacturer or authorized distributors?
All TDA7708S 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 TDA7708S meets industry standards.
7.What is the process for return or replacement of TDA7708S?
All TDA7708S units undergo pre-shipment inspection (PSI). If there is an issue with TDA7708S, 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 TDA7708S part is unused and in its original packaging.
Return procedure for TDA7708S:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TDA7708S Tags
-
MICRF220AYQS-TR
Microchip Technology
-
SX1239IMLTRT
Semtech Corporation
-
SI4356-B1A-FMR
Silicon Labs
-
SI4362-C2A-GMR
Silicon Labs
-
MAX1473EUI+T
Analog Devices Inc./Maxim Integrated
-
CMX992Q3
CML Micro
-
CMX994AQ4
CML Micro
-
MAX2112ETI+
Analog Devices Inc./Maxim Integrated
-
MAX2112ETI+T
Analog Devices Inc./Maxim Integrated
-
TESEO-LIV3R
STMicroelectronics
-
M20048-1
Antenova
-
CMX994EQ4
CML Micro
Tech Hub
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…
