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STMicroelectronics TDA7708SCB
- Part No.:
- TDA7708SCB
- Manufacturer:
- STMicroelectronics
- Category:
- RF Receivers
- Package:
- 52-VFQFN Exposed Pad
- Datasheet:
-
TDA7708SCB.pdf
- Description:
- RF RX AM/FM/RDS 108MHZ 52VFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:1,363
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Product details
Overview
TDA7708SCB from STMicroelectronics is an AEC-Q100-qualified automotive-grade 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-designed for car radio front-ends requiring high dynamic range, multipath mitigation, and I²S digital audio output.
For engineers reviewing the TDA7708SCB datasheet, TDA7708SCB pinout, TDA7708SCB application, or TDA7708SCB equivalent, key selection criteria include HD-Radio™ compatibility, integrated RDS decoding, low-IF DSP architecture, 350 mA typical supply current at 108 MHz FM, and boot firmware download via SPI/I²C for microcontroller-constrained systems.
Technical Context
The TDA7708SCB implements a low-IF, DSP-based receiver architecture with on-chip 36.864 MHz crystal oscillator, PLL-synthesized VCO, and high-dynamic-range IF-ADC. It integrates dual-path LNAs covering AM LW/MW/SW and full FM bands, plus AGC-controlled mixer stages and programmable on-chip IF filtering.
Digital baseband processing includes complex quadrature demodulation, multipath noise mitigation, RDS decoding, and HD-Radio™ channel filtering. Audio output is delivered via I²S interface; control and configuration use I²C or SPI, with minimal external components required for boot and operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.15–3.45 V - supports standard automotive 3.3 V rail with ±4.5% tolerance |
| Operating Temp | -40 °C to +85 °C - qualified for under-dash automotive environments |
| Supply Current | 350 mA typ @ 108 MHz FM - defines thermal design margin and power supply sizing |
| IF ADC Dynamic Range | Very high - enables robust reception in weak-signal and high-interference conditions |
| Digital Interface | I²C/SPI - allows flexible host MCU integration with minimal GPIO overhead |
| Audio Output | I²S - delivers bit-accurate digital audio to external DAC or audio processor |
| HD-Radio™ Support | Integrated channel filtering - eliminates need for discrete HD-Radio™ IF filters |
Pinout & Package
VFQFPN52 (8 × 8 × 1.0 mm) package with 52 leads, 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 / GND | Power supply pins | Dedicated analog/digital VCC and GND pairs minimize noise coupling in mixed-signal operation |
| AM_IN / FM_IN | Radio RF inputs | Separate differential inputs for AM and FM antenna paths with internal LNA biasing |
| CLKIN / XTAL | Crystal oscillator interface | Supports 36.864 MHz fundamental-mode crystal for precise IF generation |
| I2S_SD / SCK / WS | Digital audio interface | Standard I²S master mode outputs - compatible with common audio SoCs and DACs |
| SCL / SDA / MOSI / MISO / SCK | Control interfaces | Dual-mode I²C/SPI allows host flexibility; boot firmware loaded via SPI |
Key Features
| Feature | Design Value |
|---|---|
| Multipath noise mitigation | On-chip DSP algorithm reduces fading and distortion in urban driving environments |
| Integrated RDS decoder | Eliminates need for external RDS processing IC or host CPU decoding overhead |
| Low-IF DSP architecture | Reduces image rejection filter complexity and improves AM/FM selectivity vs. zero-IF |
| Minimal external BOM | Requires only crystal, decoupling caps, and antenna matching - no external IF filters or mixers |
| AEC-Q100 Grade 2 | Qualified for automotive applications with guaranteed reliability over full temperature range |
Applications
| Automotive AM/FM Radio | HD-Radio™ Receiver Module |
|---|---|
Use Scenario: Integrated head unit in mid-tier passenger vehicle with analog antenna input and digital audio backend. IC Role / Device Role / Timing Role: Primary AM/FM/HD-Radio™ tuner front-end with I²S output and RDS metadata extraction. Use Value: Single-chip solution reduces PCB area by >40% versus discrete tuner + IF + decoder architectures. | Use Scenario: Aftermarket HD-Radio™ add-on module interfacing with legacy analog radio system. IC Role / Device Role / Timing Role: HD-Radio™ channel filter and digital IF processor, paired with STA680D decoder. Use Value: Enables HD-Radio™ capability without redesigning RF front-end or replacing existing audio path. |
| Telematics Infotainment Gateway | Commercial Fleet Radio Terminal |
Use Scenario: Dual-tuner infotainment platform supporting concurrent AM/FM and data services (e.g., traffic, weather). IC Role / Device Role / Timing Role: One of two TDA7708SCB units handling broadcast audio while feeding RDS/VICS data to MCU. Use Value: On-chip RDS and VICS interface support reduces host software stack complexity and latency. | Use Scenario: Ruggedized mobile radio in delivery vans or service vehicles operating across wide geographic coverage. IC Role / Device Role / Timing Role: Main tuner IC delivering stable reception under vibration, temperature cycling, and EMI-rich environments. Use Value: AEC-Q100 qualification and -40 °C to +85 °C operation ensure uptime in harsh duty cycles. |
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 wider band coverage (SW/LW/FM/DAB) but lacks native HD-Radio™ filtering | Preferred when multi-standard (DAB+/FM/AM) is required and HD-Radio™ is not mandatory |
| MAX2175 (Maxim) | Zero-IF architecture; higher sensitivity but more susceptible to DC offset and LO leakage | No integrated RDS or HD-Radio™ processing - requires external DSP or host CPU implementation | Chosen for cost-sensitive non-automotive designs where board space is less constrained |
Compared with Si4790x and MAX2175, the TDA7708SCB offers tighter integration for HD-Radio™-enabled automotive radios, lower external component count, and AEC-Q100 assurance-making it optimal where automotive compliance, small footprint, and HD-Radio™ channel filtering are mandatory.
Availability
TDA7708SCB is available at Aetrix Electronics and suitable for automotive infotainment systems, HD-Radio™ upgrade modules, and commercial fleet communication terminals requiring stable component supply, long lifecycle support, and AEC-Q100 traceability.
Supply support for TDA7708SCB 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, power ICs, sensors, and analog/mixed-signal products for automotive, industrial, and consumer markets.
The TDA7708SCB belongs to ST's automotive radio tuner product line, engineered specifically to consolidate AM/FM/HD-Radio™ signal chain functionality into a single AEC-Q100-compliant device for cost- and space-constrained car audio platforms.
FAQ
Does the TDA7708SCB require an external crystal oscillator?
Yes - it requires a 36.864 MHz fundamental-mode crystal connected to the CLKIN/XTAL pins. The internal oscillator circuit drives the PLL and IF synthesis; no external oscillator IC is needed, but crystal load capacitance must match the 12 pF specification per the datasheet layout guidelines.
Can the TDA7708SCB decode HD-Radio™ audio natively?
No - it performs HD-Radio™ channel filtering and baseband digitization but does not decode HD-Radio™ audio streams. An external STA680D HD-Radio™ decoder IC is required for full HD-Radio™ audio playback and metadata extraction.
What is the boot process for the TDA7708SCB?
The IC requires a small firmware image (typically <4 KB) to be downloaded via SPI or I²C after power-up. This boot code configures internal DSP blocks and RF calibration parameters; no external flash memory is needed due to on-chip ROM storage for core routines.
Is the TDA7708SCB pin-compatible with earlier TDA7708S variants?
Yes - TDA7708SCB shares identical pinout, package dimensions, and electrical characteristics with TDA7708S and TDA7708STR. Only packaging differs (tray vs. tape-and-reel); all share the same VFQFPN52 footprint and thermal pad layout.
TDA7708SCB 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)
TDA7708SCB FAQ
1.How can I place an order for TDA7708SCB through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7708SCB 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 TDA7708SCB reliable?
The price and inventory of TDA7708SCB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7708SCB is usually 5 days.
3.What payment methods are accepted for TDA7708SCB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7708SCB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7708SCB?
TDA7708SCB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7708SCB 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 TDA7708SCB?
For technical support, including TDA7708SCB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7708SCB requirements.
6.How does Aetrix verify that TDA7708SCB is sourced from the original manufacturer or authorized distributors?
All TDA7708SCB 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 TDA7708SCB meets industry standards.
7.What is the process for return or replacement of TDA7708SCB?
All TDA7708SCB units undergo pre-shipment inspection (PSI). If there is an issue with TDA7708SCB, 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 TDA7708SCB part is unused and in its original packaging.
Return procedure for TDA7708SCB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TDA7708SCB Tags
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MICRF220AYQS-TR
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SI4356-B1A-FMR
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CMX994AQ4
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MAX2112ETI+
Analog Devices Inc./Maxim Integrated
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MAX2112ETI+T
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TESEO-LIV3R
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M20048-1
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CMX994EQ4
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