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STMicroelectronics TDA7706CB
- Part No.:
- TDA7706CB
- Manufacturer:
- STMicroelectronics
- Category:
- RF Misc ICs and Modules
- Package:
- 64-LQFP
- Datasheet:
-
TDA7706CB.pdf
- Description:
- IC TUNER AM/FM HD INTERFC 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,004
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Product details
Overview
TDA7706CB from STMicroelectronics is a highly integrated AM/FM/Weather-band tuner IC for automotive radio systems, featuring fully integrated VCO (2.7 GHz center), high-speed PLL (100 µs settling), digital IF processing with adaptive bandwidth control, RDS demodulation with block synchronization, and I²S/I²C interfaces - all in a single LQFP64 package supporting HD Radio™ baseband connectivity.
For engineers reviewing the TDA7706CB datasheet, TDA7706CB pinout, TDA7706CB application, or TDA7706CB equivalent, key selection considerations include FM/AM image rejection performance, programmable AGC time constants (TCFM, TCAM, TCAM2), dual DSP core architecture (fixed tuner + customizable), 36.48 MHz crystal oscillator interface, and HD Radio™ I/Q baseband signal routing via GPIO0–GPIO8 SAI interface.
Technical Context
The TDA7706CB integrates two independent RF front-ends: an FM mixer with software-selectable inputs and automatic self-alignment for pre-selection filter tuning, and an AM LNA with 26 dB max gain (set by external 470 Ω resistor) plus dual-order AGC. Its IF path uses two fully differential Sigma-Delta ADCs (36.48 MHz sampling, 325 kHz bandwidth) feeding a fixed-function DSP core handling digital down-conversion, noise blanking, stereo decoding, and RDS error correction.
A second free DSP core enables custom signal processing, accessible via tap points on the main signal path. The device supports master/slave clock operation via CK_SEL pin and delivers CD-quality audio (>100 dB DR) through integrated stereo DACs, while providing HD Radio™ compatibility via dedicated SAI-based I/Q baseband interface compliant with Ibiquity RX_SSS_1108 specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RF Bands | AM (LW/MW/SW), FM (EU/US/Japan/East Europe/Weather), full world coverage |
| VCO Center Frequency | ~2.7 GHz; fully integrated, no external tuning components required |
| PLL Settling Time | ~100 µs; enables fast RDS group acquisition and channel switching |
| IF ADC Architecture | Dual continuous-time Sigma-Delta; 36.48 MHz sampling, 325 kHz input bandwidth, IQ path with 90° phase shift |
| DAC Performance | Stereo audio DAC with >100 dB dynamic range; outputs analog left/right channels |
| Crystal Frequency | 36.48 MHz fundamental-mode crystal; internal load capacitance optimized, no external caps recommended |
| DSP Cores | Two cores: primary fixed-function (ROM-based tuner processing) + secondary free-core for custom algorithms |
| HD Radio Interface | SAI-based I/Q baseband interface compliant with Ibiquity RX_SSS_1108; supports digital audio blending |
Pinout & Package
LQFP64 package (10 × 10 × 1.4 mm), RoHS-compliant ECOPACK® grade, with exposed thermal pad.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1–2, 4–5, 15–16, 24–25, 37–44, 45 | RF/AGC/SAI I/O | FMPINDRV/FMPINDdec (FM PIN diode control); LNAin/LNAout (AM LNA); GPIO0–GPIO8 (SAI clk/WS/data for HD Radio I/Q) |
| 8, 13, 27, 28, 30, 35, 51, 59, 60 | Power Supply Inputs | VCCRF (5 V RF), VCCVCO (5 V VCO), Vdig (5 V digital), VCCreg1V2 (5 V to 1.2 V reg), VDD3V3 (3.3 V IO), VCC-ADC_DAC (5 V DAC/ADC), VCC-PLL (5 V PLL) |
| 6, 10, 17, 26, 36, 46, 54, 56, 61 | Ground Terminals | GNDRF (RF ground), GNDVCO (VCO ground), GNDLNA (AM LNA ground), GNDSLINK (inter-IC bus ground), GND3V3 (3.3 V IO ground), GND1V2 (DSP core ground), GND-REF (ref regulator ground), GND-ADC_DAC (DAC/ADC ground), GND-PLL (PLL ground) |
| 32, 33–34, 48, 62 | Control & Test Signals | RDSint (RDS interrupt output), I2CSDA/I2CSCL (I²C interface), Test (test mode enable), PLLtest (PLL diagnostic output) |
| 52–53, 55, 57–58, 64 | Oscillator & Analog Outputs | OSCin/OSCout (36.48 MHz crystal interface), Vrefdec (3.3 V bias decoupling), DACoutL/DACoutR (stereo audio outputs), TVDAC (tuning voltage output) |
Key Features
| Feature | Design Value |
|---|---|
| Automatic FM front-end alignment | On-chip self-calibration of pre-selection filter and image rejection without external test equipment |
| Programmable dual-order AM AGC | Two-stage attenuation: first LNA gain reduction (~10 dB), then PIN diode activation; time constants set by TCAM/TCAM2 pins |
| Digital IF with adaptive bandwidth | Software-controlled IF filter bandwidth adjustment to optimize SNR vs. adjacent-channel rejection per band |
| RDS demodulation with block sync | Hardware-accelerated RDS decoding including error correction, group synchronization, and RDSINT interrupt generation |
| HD Radio™ baseband interface | SAI-configurable GPIOs (GPIO0–GPIO8) deliver I/Q baseband signals to external decoder and accept blended digital audio |
| Single 5 V supply operation | All major domains (RF, VCO, digital, DAC/ADC, PLL) powered from one 5 V rail; internal regulators generate 1.2 V and 3.3 V |
Applications
| Automotive AM/FM Radio Head Unit | HD Radio™-Enabled Vehicle Infotainment |
|---|---|
|
Use Scenario: Integrated car-radio tuner in OEM head units requiring RDS, weather band, and global band support. IC Role / Device Role / Timing Role: Primary tuner IC performing RF mixing, IF digitization, stereo/RDS decoding, and analog audio output. Use Value: Reduces BOM count by integrating VCO, PLL, LNA, mixers, IF filters, DACs, and DSP - eliminating ~15 discrete RF/analog components. |
Use Scenario: HD Radio™ receiver system where digital audio blending between analog and HD streams is required. IC Role / Device Role / Timing Role: Baseband signal provider: delivers synchronized I/Q samples to external HD decoder and accepts blended PCM via SAI. Use Value: Enables seamless audio transition during weak-signal conditions using hardware-supported digital blending without host CPU intervention. |
| Multi-Band Shortwave Receiver | Advanced RDS Navigation System |
|
Use Scenario: Portable or marine shortwave receiver needing extended AM band coverage (LW/MW/SW) with high image rejection. IC Role / Device Role / Timing Role: Dual-path AM tuner with software-selectable mixer inputs and programmable AGC for variable-bandwidth reception. Use Value: Achieves >65 dB image rejection across SW bands using digital IF filtering and automatic alignment - no manual calibration needed. |
Use Scenario: In-vehicle navigation system using RDS-TMC traffic data for real-time route updates. IC Role / Device Role / Timing Role: RDS demodulator with block-level synchronization and error-corrected group parsing for reliable TMC message extraction. Use Value: Guarantees <10⁻⁶ bit error rate on RDS data stream via built-in CRC and forward error correction - critical for safety-critical navigation alerts. |
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; no integrated VCO/PLL; requires external synthesizer; lower integration density | Targets ultra-low-power portable radios; lacks weather band and HD Radio baseband interface | Choose for battery-powered designs where RF flexibility outweighs integration; avoid if HD Radio or weather band is required. |
| MAX2175 (Maxim Integrated) | Direct-conversion RF-to-digital tuner; no analog audio outputs; outputs only digital I/Q; no RDS or stereo decoder | Requires external DSP/FPGA for demodulation; used in software-defined automotive platforms with centralized processing | Choose when full signal chain control is needed and host processor handles all demodulation; not drop-in for analog-output systems. |
Compared with Si4790x and MAX2175, the TDA7706CB provides highest functional integration for automotive analog-output radios - combining RF front-end, digital IF, RDS/stereo decode, DACs, and HD Radio baseband in one LQFP64 IC - reducing PCB area by 40% and eliminating external PLL/VCO tuning components.
Availability
TDA7706CB is available at Aetrix Electronics and suitable for automotive infotainment systems, HD Radio™ receiver modules, and multi-band shortwave communication equipment requiring stable component supply throughout production lifecycles.
Supply support for TDA7706CB 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 management ICs, sensors, and analog/mixed-signal devices for automotive, industrial, and consumer markets.
The TDA7706CB belongs to ST's automotive audio tuner product line, engineered specifically for high-reliability, low-component-count car-radio systems with HD Radio™ readiness and global band coverage - targeting Tier-1 suppliers and OEM infotainment platforms.
FAQ
What crystal frequency is required for the TDA7706CB?
The TDA7706CB requires a 36.48 MHz fundamental-mode crystal connected to OSCin/OSCout pins. Internal load capacitance is optimized for this frequency; adding external load capacitors is not recommended. The oscillator supports master/slave configuration via CK_SEL pin - tied to GND for master mode (default), or to 5 V for slave mode with external clock injection.
Does the TDA7706CB support RDS group synchronization and error correction?
Yes. The TDA7706CB performs full RDS demodulation with block synchronization, CRC validation, and forward error correction. It generates an RDS interrupt (RDSINT pin) upon successful group lock and provides decoded RDS data via I²C. Block-level timing ensures <10⁻⁶ bit error rate under typical automotive RF conditions.
How is HD Radio™ audio blending implemented on the TDA7706CB?
HD Radio™ blending is implemented via the SAI-configured GPIO0–GPIO8 pins: GPIO0 receives blend control signal from external HD decoder; GPIO1–GPIO4 carry I/Q baseband samples to the decoder; GPIO5–GPIO8 return decoded PCM audio. The internal DSP performs real-time analog/digital audio mixing without host CPU involvement.
Can the TDA7706CB operate without external PIN diodes?
Yes - the TDA7706CB integrates AM/FM AGC circuitry and can drive external PIN diodes (up to 15 mA), but it also supports passive preselection architectures without them. For cost-sensitive designs, FM/AM front-end attenuation is handled internally via LNA gain control and mixer bias adjustment, eliminating need for external diodes in many configurations.
TDA7706CB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Tuner
- Frequency:
- -
- RF Type:
- AM, FM
- Secondary Attributes:
- -
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-TQFP (10x10)
TDA7706CB FAQ
1.How can I place an order for TDA7706CB through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7706CB 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 TDA7706CB reliable?
The price and inventory of TDA7706CB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7706CB is usually 5 days.
3.What payment methods are accepted for TDA7706CB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7706CB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7706CB?
TDA7706CB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7706CB 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 TDA7706CB?
For technical support, including TDA7706CB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7706CB requirements.
6.How does Aetrix verify that TDA7706CB is sourced from the original manufacturer or authorized distributors?
All TDA7706CB 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 TDA7706CB meets industry standards.
7.What is the process for return or replacement of TDA7706CB?
All TDA7706CB units undergo pre-shipment inspection (PSI). If there is an issue with TDA7706CB, 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 TDA7706CB part is unused and in its original packaging.
Return procedure for TDA7706CB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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