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STMicroelectronics TDA7703RTR
- Part No.:
- TDA7703RTR
- Manufacturer:
- STMicroelectronics
- Category:
- RF Receivers
- Package:
- 44-LQFP
- Datasheet:
-
TDA7703RTR.pdf
- Description:
- RF RECEIVER AM/FM 44LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,785
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Product details
Overview
TDA7703RTR from STMicroelectronics is a highly integrated AM/FM car radio tuner IC featuring fully integrated VCO, digital IF signal processing, adaptive FM bandwidth control, and stereo decoding with noiseblanker - all operating from a single 5 V supply in LQFP44 package. It delivers high image rejection, automatic self-alignment, and I²C bus control for automotive infotainment systems requiring compact, drift-free tuning.
For engineers reviewing the TDA7703RTR datasheet, TDA7703RTR pinout, TDA7703RTR application, or TDA7703RTR equivalent, this page provides verified technical context, real-world use cases, validated alternatives, and supply-ready availability details specific to automotive radio front-end design.
Technical Context
The TDA7703RTR integrates dual-path RF front-ends (AM-LNA + AM mixer; FM mixer), a fully integrated VCO covering EU/US/Japan FM bands and LW/MW AM bands, and a high-speed PLL with ≤300 µs settling time and 5 kHz (FM) / 500 Hz (AM) frequency steps. Its IQ IF-ADC feeds a fixed-ROM DSP that performs digital down-conversion, dynamic channel selection (DISS), soft mute, stereo blend, and de-emphasis filtering.
Digital IF processing enables adaptive FM bandwidth control, high-selectivity digital filtering, and automatic image rejection alignment without external tuning components. The stereo DAC outputs left/right analog audio after noiseblanker-enhanced demodulation, while I²C interface (address 0xC2/0xC3) supports high-level commands including frequency set and autonomous seek.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | Single 5 V rail powers RF, IF, PLL, VCO, DAC, and digital logic - eliminates multi-rail design complexity. |
| IF Architecture | IQ digital IF with integrated ADC and DSP-based processing - enables drift-free, software-tunable selectivity and bandwidth. |
| FM Tuning Step | 5 kHz resolution with PLL settling ≤300 µs - supports fast station seeking and precise channel locking. |
| AM Band Coverage | LW (150–285 kHz) and MW (520–1710 kHz) with integrated LNA, PIN diode AGC, and mixer - no external preselector needed. |
| Stereo Decoder | On-chip stereo decoder with noiseblanker, soft mute, adjacent-channel mute, and stereo blend - reduces MCU firmware load. |
| I²C Interface | Standard mode (≤500 kbit/s), address 0xC2 (write) / 0xC3 (read), with BUSSET-configurable boot mode - simplifies host µP integration. |
| Crystal Frequency | 37.05 MHz fundamental or 3rd-overtone crystal - enables stable local oscillator synthesis across global AM/FM bands. |
Pinout & Package
LQFP44 (10 × 10 × 1.4 mm) package with exposed thermal pad; RoHS-compliant, tray and tape-and-reel options available (TDA7703RTR = tape-and-reel variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LF1) | PLL loop filter output | Drives external RC loop filter for PLL stability and tuning response optimization. |
| 4 (FMMIXIN), 12/15 (LNAIN/LNAIN2), 18 (AMMIXIN) | RF input terminals | Accept passive wideband antenna signals directly - no external preamplifier or matching required. |
| 26 (SDA), 27 (SCL), 29 (BUSSET), 30 (RSTN) | I²C control interface | Enable high-level command execution (e.g., "set frequency", "start seek") with minimal µP overhead. |
| 37 (DACOUTL), 38 (DACOUTR) | Analog audio outputs | Direct-drive capability for line-level audio stages - eliminates need for external op-amps in basic designs. |
| 34/35 (OSCOUT/OSCIN) | Crystal oscillator interface | Supports 37.05 MHz fundamental or 3rd-overtone crystals - ensures accurate, low-jitter LO generation. |
Key Features
| Feature | Design Value |
|---|---|
| Fully integrated VCO | Eliminates external varactor diodes and tuning inductors - reduces BOM count and layout sensitivity. |
| Digital IF filters | Provide >70 dB adjacent-channel rejection and adaptive FM bandwidth control - improves weak-signal reception in urban environments. |
| Automatic image rejection alignment | Removes manual calibration during production - lowers manufacturing test time and cost. |
| Integrated AM-LNA + PIN diode AGC | Delivers >28 dB gain with programmable time constant - handles strong AM interference without front-end saturation. |
| Noiseblanker-enabled stereo decoder | Suppresses impulse noise (e.g., ignition spikes) in FM stereo output - enhances audio clarity without MCU intervention. |
Applications
| Automotive AM/FM Radio Head Unit | Aftermarket Car Stereo System |
|---|---|
|
Use Scenario: Integrated tuner in OEM head unit with microcontroller host and analog audio output stage. IC Role / Device Role / Timing Role: Primary AM/FM signal acquisition, IF digitization, stereo demodulation, and left/right audio DAC - replaces discrete tuner + DSP + DAC solution. Use Value: Reduces PCB area by >40% vs. discrete tuner modules and enables software-defined tuning behavior via I²C. |
Use Scenario: Compact aftermarket stereo with digital display, RDS support, and seek functionality. IC Role / Device Role / Timing Role: Standalone tuner subsystem handling full RF-to-audio chain - driven by host µP using high-level I²C commands. Use Value: Autonomous seek operation and frequency setting eliminate PLL divider calculation in firmware - accelerates development cycle. |
| Marine Audio Receiver | Commercial Fleet Radio Terminal |
|
Use Scenario: Waterproof marine receiver requiring robust AM reception under electrical noise and variable antenna conditions. IC Role / Device Role / Timing Role: AM front-end with integrated LNA, PIN diode AGC, and high-dynamic-range IF processing - maintains MW/LW sensitivity amid engine noise. Use Value: Built-in noiseblanker and soft mute suppress ignition transients and fading - improves intelligibility without external DSP. |
Use Scenario: Heavy-duty fleet communication terminal integrating broadcast radio for driver alerts and entertainment. IC Role / Device Role / Timing Role: Tuner co-located with CAN controller and audio codec - shares 5 V supply and I²C bus with system MCU. Use Value: Single-supply operation and I²C register access enable synchronized audio/radio state management across vehicle networks. |
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 radio architecture with wider frequency range (150 kHz–30 MHz); requires external crystal oscillator and separate audio DAC. | Supports SW/LW/MW/FM + DRM; higher flexibility but larger firmware footprint and BOM. | Choose for multi-band, future-proof designs requiring DRM or shortwave; avoid if minimizing code size and component count is critical. |
| MAX2112 (Maxim Integrated) | Analog IF output only; no integrated stereo decoder or DAC; requires external DSP and audio conversion. | Targeted at hybrid architectures where baseband processing is handled off-chip - less suitable for cost-sensitive standalone radios. | Choose when existing system already includes high-performance audio DSP; not recommended as drop-in replacement for TDA7703RTR's integrated audio path. |
Compared with Si4790x and MAX2112, the TDA7703RTR offers the highest level of integration for dedicated AM/FM automotive radios - delivering complete RF-to-analog-audio functionality in one LQFP44 IC with no external IF filters, decoders, or DACs required.
Availability
TDA7703RTR is available at Aetrix Electronics and suitable for automotive infotainment systems, aftermarket stereo receivers, and marine audio equipment requiring stable component supply and long-lifecycle support.
Supply support for TDA7703RTR 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 specializing in automotive, industrial, and power management ICs, with broad portfolio coverage and AEC-Q100 qualified products.
The TDA7703RTR belongs to ST's HIT (Highly Integrated Tuner) family, designed specifically for cost-optimized, space-constrained car radio applications requiring high selectivity, low external component count, and simplified software integration.
FAQ
What is the function of the BUSSET pin (Pin 29) on the TDA7703RTR?
The BUSSET pin configures the I²C bus interface mode during power-up reset. When pulled low during RSTN release, it selects standard I²C addressing (0xC2/0xC3); left floating, its internal 50 kΩ pull-down ensures default mode. This setup determines how the host µP communicates high-level commands like "start seek" or "set frequency".
Does the TDA7703RTR require external IF filters or SAW components?
No. The TDA7703RTR integrates digital IF filters with adaptive bandwidth control and high selectivity (>70 dB adjacent-channel rejection), eliminating the need for external SAW filters, ceramic resonators, or analog IF transformers - reducing bill-of-materials and board space.
Can the TDA7703RTR operate with a 3.3 V supply instead of 5 V?
No. Absolute maximum ratings specify 5.5 V max, and all functional blocks - including RF front-end, VCO, PLL, IF-ADC, and stereo DAC - are designed for nominal 5 V operation. Supplying 3.3 V will prevent proper biasing of analog circuits and cause functional failure.
How does the automatic image rejection alignment work in practice?
The TDA7703RTR performs real-time calibration of mixer quadrature phase and amplitude imbalance using internal DSP algorithms. It adjusts correction coefficients during idle periods or low-SNR conditions - no user intervention or factory calibration is required, ensuring consistent image rejection across temperature and voltage variations.
TDA7703RTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 44-LQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Frequency:
- -
- Sensitivity:
- -
- Data Rate (Max):
- -
- Modulation or Protocol:
- AM, FM
- Applications:
- Audio
- Current - Receiving:
- -
- Data Interface:
- PCB, Surface Mount
- Memory Size:
- -
- Antenna Connector:
- PCB, Surface Mount
- Features:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-TQFP (10x10)
TDA7703RTR FAQ
1.How can I place an order for TDA7703RTR through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7703RTR 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 TDA7703RTR reliable?
The price and inventory of TDA7703RTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7703RTR is usually 5 days.
3.What payment methods are accepted for TDA7703RTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7703RTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7703RTR?
TDA7703RTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7703RTR 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 TDA7703RTR?
For technical support, including TDA7703RTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7703RTR requirements.
6.How does Aetrix verify that TDA7703RTR is sourced from the original manufacturer or authorized distributors?
All TDA7703RTR 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 TDA7703RTR meets industry standards.
7.What is the process for return or replacement of TDA7703RTR?
All TDA7703RTR units undergo pre-shipment inspection (PSI). If there is an issue with TDA7703RTR, 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 TDA7703RTR part is unused and in its original packaging.
Return procedure for TDA7703RTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TDA7703RTR 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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