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STMicroelectronics TDA7708STR
- Part No.:
- TDA7708STR
- Manufacturer:
- STMicroelectronics
- Category:
- RF Receivers
- Package:
- 52-VFQFN Exposed Pad
- Datasheet:
-
TDA7708STR.pdf
- Description:
- RF RX AM/FM/RDS 108MHZ 52VFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:2,455
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Product details
Overview
TDA7708STR from STMicroelectronics is an AEC-Q100-qualified, automotive-grade CMOS AM/FM/HD-Radio™ tuner IC with digital IF processing, 3.3 V supply, -40 °C to +85 °C operating range, and VFQFPN52 (8 × 8 × 1.0 mm) package - deployed in car radio head units for high-fidelity terrestrial broadcast reception.
For engineers reviewing the TDA7708STR datasheet, TDA7708STR pinout, TDA7708STR application, or TDA7708STR equivalent, key selection considerations include its low-IF DSP architecture, integrated HD-Radio™ channel filtering, multipath noise mitigation, I²S digital audio output, and compatibility with external STA680D HD-Radio™ decoder.
Technical Context
The TDA7708STR implements a low-IF, DSP-based receiver architecture with on-chip quadrature IF-ADC (very high dynamic range), integrated RDS decoding, and HD-Radio™ channel filtering. It supports full AM (LW/MW/SW) and FM band coverage via multiple front-end LNAs and programmable AGC/mixer stages.
Signal path includes crystal oscillator (36.864 MHz), PLL/VCO frequency synthesis, analog RF front-end, complex baseband digitization, and digital signal processing for multipath mitigation and stereo demodulation - all controlled via I²C/SPI interface with minimal external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.15–3.45 V - ensures stable operation across automotive battery voltage transients |
| Supply Current | 350 mA max @ 108 MHz FM - defines power budget for head unit power management |
| Operating Temp | -40 °C to +85 °C - meets automotive cabin ambient requirements per AEC-Q100 Grade 3 |
| Junction Temp | Up to 125 °C - enables thermal margin for sealed enclosure mounting |
| Dissipated Power | 1 W max - constrains heatsinking needs in compact VFQFPN52 layout |
| ESD Rating | ±2000 V HBM - protects against assembly and in-vehicle electrostatic events |
Pinout & Package
VFQFPN52 (8 × 8 × 1.0 mm) package with 0.5 mm pitch, exposed thermal pad, and 52 terminals - optimized for automotive PCB space constraints and thermal dissipation in infotainment modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Core supply input | 3.3 V main power rail for analog/digital blocks; requires local 100 nF decoupling |
| GND | Ground reference | Common return for analog/digital sections; connected to exposed thermal pad |
| AM_IN | AM antenna input | Differential RF input for LW/MW/SW bands; ±1000 V ESD rating |
| FM_IN | FM antenna input | Differential RF input for 76–108 MHz band; internal LNA biasing enabled |
| I2S_DO | Digital audio output | Left/right channel PCM data stream at 44.1/48 kHz; compatible with standard audio codecs |
| SCL/SDA | I²C control interface | Configures tuning, AGC, RDS, and HD-Radio™ mode; supports 400 kHz fast-mode |
Key Features
| Feature | Design Value |
|---|---|
| Low-IF DSP architecture | Enables high selectivity and image rejection without external SAW filters |
| Integrated HD-Radio™ filtering | Reduces need for external channel-select filters in hybrid digital/analog receivers |
| Multipath noise mitigation | Improves audio clarity in urban driving without requiring host MCU intervention |
| Minimal external component count | Eliminates discrete IF transformers, ceramic filters, and multiple bypass caps |
| RDS decoding engine | Outputs parsed station name, program type, and traffic announcements via I²C |
Applications
| Car Radio Head Unit | HD-Radio™ Hybrid Receiver |
|---|---|
Use Scenario: Integrated infotainment system in mid-tier passenger vehicles requiring AM/FM/HD-Radio™ support. IC Role / Device Role / Timing Role: Primary tuner IC handling RF front-end, IF digitization, RDS parsing, and I²S audio streaming. Use Value: Reduces BOM by eliminating discrete IF filters and external ADCs while meeting AEC-Q100 reliability. | Use Scenario: Aftermarket HD-Radio™ upgrade module for legacy analog radios. IC Role / Device Role / Timing Role: Front-end tuner providing HD-Radio™-compliant IF signal to external STA680D decoder. Use Value: Enables HD audio delivery using single-chip tuner + dedicated decoder, avoiding full platform redesign. |
| Automotive Telematics Hub | Commercial Fleet Radio System |
Use Scenario: Connected vehicle platform integrating broadcast audio with telematics data services. IC Role / Device Role / Timing Role: Tuner supplying time-synchronized RDS traffic messages and station metadata to MCU over I²C. Use Value: Supports real-time traffic rerouting via embedded RDS-TMC decoding without additional firmware overhead. | Use Scenario: Multi-zone audio distribution in municipal or logistics fleet vehicles. IC Role / Device Role / Timing Role: Central tuner feeding I²S audio to multiple zone amplifiers via time-shared bus. Use Value: Enables simultaneous AM/FM/HD-Radio™ playback across zones using single tuner resource and low-jitter clock domain. |
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 radio architecture; requires larger firmware footprint and external flash | Supports DAB/DAB+/FM/AM but lacks native HD-Radio™ filtering | Preferred where global band coverage (DAB+) is required over HD-Radio™ compliance |
| MAX2175 (Maxim) | Zero-IF architecture; higher RF sensitivity but no integrated RDS or HD-Radio™ processing | Requires external DSP for RDS and HD-Radio™ decoding; higher total BOM cost | Selected when ultra-low phase noise and wide tuning range outweigh integration benefits |
Compared with Si4790x and MAX2175, the TDA7708STR delivers automotive-qualified HD-Radio™ readiness out-of-box with minimal external components, whereas alternatives require added firmware, memory, or companion ICs to achieve equivalent broadcast feature sets.
Availability
TDA7708STR is available at Aetrix Electronics and suitable for car radio head units, HD-Radio™ hybrid receivers, and automotive telematics hubs requiring stable component supply across extended production lifecycles.
Supply support for TDA7708STR 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 silicon.
The TDA7708STR belongs to ST's automotive infotainment tuner product line - engineered specifically for high-reliability, low-BOM terrestrial broadcast reception in temperature-stressed vehicular environments.
FAQ
Does the TDA7708STR require an external crystal oscillator?
Yes - it requires a 36.864 MHz fundamental-mode crystal connected to the XIN/XOUT pins. This frequency is fixed for PLL synthesis and cannot be substituted with other values or replaced by an external clock source without violating timing specifications.
Can the TDA7708STR decode HD-Radio™ signals independently?
No - it performs HD-Radio™ channel filtering and IF digitization but requires the external STA680D HD-Radio™ decoder IC for OFDM demodulation, error correction, and audio reconstruction. The TDA7708STR provides the compliant baseband signal to that companion device.
What is the function of the AM_IN pin's ±1000 V ESD rating?
The ±1000 V Human Body Model ESD rating on AM_IN reflects enhanced protection for the AM front-end input stage, which connects directly to long-wire antennas susceptible to static discharge during vehicle service or installation - exceeding standard AEC-Q100 Class 2 requirements.
Is firmware download mandatory for TDA7708STR operation?
Yes - a small boot firmware (FW code) must be loaded via I²C/SPI at power-up. This firmware configures internal DSP parameters and is essential for AM/FM/HD-Radio™ functionality; no operation occurs without successful download.
TDA7708STR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 52-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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)
TDA7708STR FAQ
1.How can I place an order for TDA7708STR through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7708STR 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 TDA7708STR reliable?
The price and inventory of TDA7708STR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7708STR is usually 5 days.
3.What payment methods are accepted for TDA7708STR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7708STR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7708STR?
TDA7708STR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7708STR 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 TDA7708STR?
For technical support, including TDA7708STR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7708STR requirements.
6.How does Aetrix verify that TDA7708STR is sourced from the original manufacturer or authorized distributors?
All TDA7708STR 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 TDA7708STR meets industry standards.
7.What is the process for return or replacement of TDA7708STR?
All TDA7708STR units undergo pre-shipment inspection (PSI). If there is an issue with TDA7708STR, 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 TDA7708STR part is unused and in its original packaging.
Return procedure for TDA7708STR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TDA7708STR 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
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