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STMicroelectronics TDA7708CB
- Part No.:
- TDA7708CB
- Manufacturer:
- STMicroelectronics
- Category:
- RF Receivers
- Package:
- 64-VFQFN Exposed Pad
- Datasheet:
-
TDA7708CB.pdf
- Description:
- RF RX AM/FM/RDS 108MHZ 64VFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:4,201
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Product details
Overview
TDA7708CB from STMicroelectronics is an AEC-Q100 qualified automotive-grade AM/FM tuner IC with integrated low-IF DSP architecture, 36.864 MHz crystal oscillator interface, HD-Radio™/DRM compatibility, and I²S digital audio output. It delivers RDS demodulation with group/block synchronization, multipath noise mitigation, and operates from 3.15–3.45 V over −40 °C to +85 °C ambient.
For engineers reviewing the TDA7708CB datasheet, TDA7708CB pinout, TDA7708CB application, or TDA7708CB equivalent, key selection considerations include its VFQFPN64 package footprint, 350 mA typical supply current at 108 MHz FM, built-in high-dynamic-range IF-ADC, minimal external component count, and co-processor dependency for HD-Radio™ (STA680) and DRM (STA660DRM).
Technical Context
The TDA7708CB implements a low-IF, DSP-based receiver architecture with on-chip quadrature downconversion, complex baseband processing, and integrated RDS decoder. Its front end includes multiple LNAs covering AM LW/MW/SW and full FM bands, paired with programmable AGC and mixer stages.
Signal digitization occurs via a high-dynamic-range ADC after on-chip IF filtering; subsequent DSP enables multipath mitigation, HD-Radio™ channel filtering, and supports external STA680 or STA660DRM co-processors for full HD-Radio™ or DRM demodulation - all while maintaining AEC-Q100 qualification and RoHS compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.15–3.45 V - ensures stable operation across automotive battery transients without external LDO overhead |
| Supply Current | 350 mA typ. @ 108 MHz FM - defines thermal design margin and PCB copper weight requirements |
| Ambient Temp Range | −40 °C to +85 °C - validated for under-dash automotive environments without derating |
| Junction Temp Limit | 125 °C max - constrains heatsinking needs given 27 °C/W Rth j-amb in multilayer board |
| Digital Audio Interface | I²S output - enables direct connection to audio DACs or SoCs without level-shifting or protocol translation |
| RDS Support | Group and block synchronization - provides robust station identification and traffic message decoding in urban multipath |
| ESD Rating | ±2000 V HBM - meets automotive system-level ESD immunity requirements per ISO 10605 |
Pinout & Package
VFQFPN64 (9 × 9 × 1.0 mm) package with exposed thermal pad; JEDEC MSL Level 3 moisture sensitivity; RoHS-compliant ECOPACK2 grade.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Core supply input | 3.3 V power rail requiring local 100 nF + 10 µF decoupling adjacent to pin |
| GND | Ground reference | Multiple dedicated GND pins (pins 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64) - must be connected to solid ground plane for RF stability and EMI control |
| AM_IN | AM antenna input | High-impedance differential input supporting LW/MW/SW bands; ±1000 V ESD rating |
| FM_IN | FM antenna input | Differential RF input for 76–108 MHz; optimized for ceramic or helical antennas |
| XTAL_IN / XTAL_OUT | 36.864 MHz crystal interface | Drives fundamental-mode crystal; requires load capacitors per crystal manufacturer spec |
| I²S_DOUT / I²S_BCLK / I²S_WCLK | Digital audio output interface | Left-justified I²S format at 256×Fs; supports 44.1/48 kHz sampling rates |
| I²C_SCL / I²C_SDA | Configuration interface | Standard-mode (100 kHz) I²C bus for register programming and status readback |
| SPI_MOSI / SPI_MISO / SPI_SCK / SPI_CS | Firmware loading interface | Required for booting internal DSP core; minimal FW code size reduces host MCU storage burden |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 2 qualification | Validated for automotive use up to +105 °C junction temperature with extended reliability testing |
| Integrated RDS decoder with sync | Eliminates need for external RDS processor; supports PI, PS, RT, and TMC decoding |
| Multipath noise mitigation | Real-time DSP algorithm improves audio clarity in urban canyons without analog tuning adjustments |
| HD-Radio™/DRM channel filtering | On-chip FIR filters reduce host co-processor computational load for STA680/STA660DRM integration |
| Low external component count | Only crystal, decoupling caps, and antenna matching network required - no external IF filters or mixers |
Applications
| Automotive AM/FM Radio Head Unit | HD-Radio™ Receiver Module |
|---|---|
Use Scenario: Integrated infotainment system in passenger vehicles requiring broadcast radio reception with RDS traffic announcements. IC Role / Device Role / Timing Role: Primary AM/FM tuner IC providing digitized baseband I²S output and RDS metadata to main SoC. Use Value: Enables compact, cost-effective head unit design with AEC-Q100 reliability and <100 ms channel seek time. | Use Scenario: Aftermarket HD-Radio™ adapter module adding digital subchannel support to legacy analog radios. IC Role / Device Role / Timing Role: Front-end tuner supplying filtered HD-Radio™ IF data to external STA680 decoder via parallel interface. Use Value: Reduces BOM by integrating HD-Radio™ channel filtering and clock recovery, eliminating discrete SAW filters. |
| DRM Broadcast Receiver | Commercial Fleet Radio Terminal |
Use Scenario: Portable DRM shortwave receiver for international broadcasting in remote regions with limited infrastructure. IC Role / Device Role / Timing Role: RF-to-baseband converter feeding STA660DRM decoder; handles 3–30 MHz SW band with automatic gain control. Use Value: Achieves >50 dB image rejection and <2.5 µV sensitivity in SW band using single-chip solution. | Use Scenario: Ruggedized two-way radio terminal in logistics fleets requiring broadcast traffic updates and fleet messaging. IC Role / Device Role / Timing Role: Tuner subsystem delivering RDS-synchronized TMC data and audio to vehicle telematics controller. Use Value: Supports real-time route re-routing via RDS-TMC without GPS dependency or cellular data usage. |
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 (Silicon Labs) | Software-defined architecture with wider frequency coverage (150 kHz–30 MHz); no external crystal required (integrated oscillator) | Supports SW/LW/AM/FM/shortwave without band-switching hardware; lacks native HD-Radio™ filtering | Preferred when multi-band flexibility and software configurability outweigh HD-Radio™ integration needs |
| MAX2175 (Maxim Integrated) | Zero-IF architecture with integrated fractional-N PLL; supports I²S and PCM outputs; lower supply current (180 mA) | Requires external RDS decoder; not AEC-Q100 qualified; limited to −20 °C to +70 °C ambient | Applicable for consumer or industrial portable radios where automotive qualification is not mandatory |
Compared with Si4790x and MAX2175, the TDA7708CB uniquely combines AEC-Q100 qualification, integrated HD-Radio™/DRM channel filtering, and RDS decoding in a single chip - making it the only drop-in solution for automotive OEMs requiring full terrestrial broadcast stack compliance without co-processor firmware complexity.
Availability
TDA7708CB is available at Aetrix Electronics and suitable for automotive infotainment systems, HD-Radio™ retrofit modules, and commercial fleet communication terminals requiring stable component supply, long lifecycle support, and traceable sourcing.
Supply support for TDA7708CB 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 TDA7708CB belongs to ST's automotive radio tuner product line, engineered specifically to replace discrete tuner designs with single-chip solutions meeting stringent AEC-Q100, EMC, and thermal requirements of modern car radios.
FAQ
Does the TDA7708CB require external firmware loading?
Yes. The TDA7708CB requires a small firmware image (typically <4 KB) to be loaded via its SPI interface during power-up. This boot code initializes the internal DSP core and configures RF front-end parameters. The minimal size allows use with microcontrollers having limited flash memory.
Can the TDA7708CB operate without an external co-processor for HD-Radio™?
No. While the TDA7708CB performs HD-Radio™ channel filtering and IF conditioning, full HD-Radio™ demodulation and audio decoding require the external STA680 co-processor. The IC outputs pre-filtered HD-Radio™ IF data, not decoded audio or metadata.
What is the role of the 36.864 MHz crystal?
The 36.864 MHz crystal serves as the master reference for the on-chip PLL and digital signal processing clock domain. It ensures precise frequency synthesis for AM/FM channel selection and stable sampling of the IF-ADC, directly impacting RDS timing accuracy and multipath mitigation performance.
Is the TDA7708CB pin-compatible with earlier ST tuner ICs like TDA7706?
No. The TDA7708CB uses a 64-pin VFQFPN package with different pin assignments, power sequencing requirements, and interface protocols compared to TDA7706 (which uses QFN48). Migration requires PCB redesign and firmware adaptation due to architectural differences in DSP engine and register map.
TDA7708CB 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)
TDA7708CB FAQ
1.How can I place an order for TDA7708CB through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7708CB 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 TDA7708CB reliable?
The price and inventory of TDA7708CB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7708CB is usually 5 days.
3.What payment methods are accepted for TDA7708CB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7708CB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7708CB?
TDA7708CB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7708CB 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 TDA7708CB?
For technical support, including TDA7708CB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7708CB requirements.
6.How does Aetrix verify that TDA7708CB is sourced from the original manufacturer or authorized distributors?
All TDA7708CB 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 TDA7708CB meets industry standards.
7.What is the process for return or replacement of TDA7708CB?
All TDA7708CB units undergo pre-shipment inspection (PSI). If there is an issue with TDA7708CB, 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 TDA7708CB part is unused and in its original packaging.
Return procedure for TDA7708CB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TDA7708CB 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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