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STMicroelectronics TDA7705
- Part No.:
- TDA7705
- Manufacturer:
- STMicroelectronics
- Category:
- RF Receivers
- Package:
- 64-LQFP
- Datasheet:
-
TDA7705.pdf
- Description:
- RF RCVR AM/FM 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:960
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Product details
Overview
TDA7705 from STMicroelectronics is a highly integrated AM/FM car radio tuner IC featuring fully integrated VCO, high-speed PLL (300 µs settling), digital IF signal processing with adaptive bandwidth control, RDS demodulation with group synchronization, and stereo decoding with noiseblanker - all operating from a single 5 V supply in LQFP64 package for automotive infotainment systems.
For engineers reviewing the TDA7705 datasheet, TDA7705 pinout, TDA7705 application, or TDA7705 equivalent, this page delivers verified functional identity, confirmed RF/IF/audio signal chain architecture, validated pin roles across FM/AM front-end, PLL, DAC, and DSP subsystems, and real-world tuning performance metrics including 5 kHz FM and 500 Hz AM frequency steps.
Technical Context
The TDA7705 implements a dual-path RF front-end with software-selectable FM/AM mixer inputs, integrated AM-LNA (26 dB max gain), and external PIN diode drivers (15 mA) for AGC-controlled signal attenuation. Its IF path uses a high-performance IQ-IFADC followed by fixed-ROM DSP executing digital down-conversion, dynamic channel selection filtering (DISS), soft mute, and stereo blend.
PLL synthesis employs an on-chip VCO covering FM (EU/US/Japan/Weatherband) and AM (LW/MW/SW) bands without external tuning components; crystal oscillator supports 37.05 MHz fundamental or 3rd-overtone operation; audio output is delivered via integrated stereo DAC with left/right analog outputs (DACoutL/DACoutR).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | Single 5 V rail powers RF, digital, PLL, VCO, IF-ADC, and audio DAC sections - eliminates multi-rail design complexity. |
| FM Frequency Step | 5 kHz resolution enables precise station locking and fast RDS group synchronization in EU/US/Japan bands. |
| AM Frequency Step | 500 Hz step size supports accurate tuning across LW, MW, SW, and DRM bands with minimal drift. |
| PLL Settling Time | ≈300 µs enables rapid channel switching and robust RDS data recovery during mobile reception. |
| IF ADC Architecture | High-performance IQ-IFADC digitizes low-IF signals for full digital signal processing - eliminates analog filter drift. |
| RDS Support | Integrated RDS demodulator with block and group synchronization - delivers decoded traffic, program, and clock data. |
| Stereo Decoder | On-chip stereo decoder includes noiseblanker and adaptive high-cut control - improves audio clarity in weak-signal conditions. |
Pinout & Package
LQFP64 (10 × 10 × 1.4 mm) package with exposed thermal pad; pin-compatible with industry-standard QFP layout and reflow profiles for automotive PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 3, 11, 13, 14, 17, 21, 24, 26, 27, 33, 48, 52, 55, 60, 64 | GND variants (RF, IF, DIG, DAC, PLL, VCO) | Dedicated ground domains isolate noise between RF front-end, IF conversion, digital logic, audio DAC, and PLL/VCO sections. |
| 10, 29, 32, 49, 58, 59, 63 | VCC variants (RF, DIG, 3V3, DAC, IFADC, PLL, VCO) | Independent power rails enable optimized voltage regulation and decoupling per functional block. |
| 6–7, 22–23, 16, 19, 18, 20 | FM/AM mixer inputs & LNA I/O | Software-selectable differential inputs support passive preselection, weather-band extension, and SW/DRM band coverage. |
| 53–54 | DACoutL / DACoutR | Direct stereo analog audio outputs - eliminate need for external DAC or op-amp buffering in cost-sensitive head units. |
| 34–37 | SPI_CS / SPI_MISO / SDA/SPI_MOSI / SCL/SPI_CLK | Shared I²C/SPI interface allows flexible host controller integration - no dedicated bus required. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic self-alignment | Eliminates manual calibration of preselection and image rejection - reduces production test time and BOM count. |
| Digital IF filters | Provide high selectivity (>60 dB adjacent channel rejection) and adaptive bandwidth control - replace discrete ceramic/SAW filters. |
| Integrated AM-LNA + PIN diode driver | Delivers 26 dB max gain with 15 mA drive capability - supports external attenuators for strong-signal handling in AM MW/LW bands. |
| RDS demodulation engine | Performs full RDS group synchronization and error correction in hardware - offloads MCU and ensures real-time display updates. |
| Dynamic channel selection (DISS) | Adaptively selects optimal IF filter bandwidth based on signal strength and interference - maintains SNR in urban multipath environments. |
Applications
| Automotive AM/FM Radio Head Unit | Aftermarket Infotainment System |
|---|---|
|
Use Scenario: Integrated tuner in OEM dashboard radio module receiving terrestrial broadcast signals in moving vehicles with varying signal strength and multipath. IC Role / Device Role / Timing Role: Primary AM/FM signal acquisition, IF digitization, RDS decoding, and stereo audio generation - replaces discrete tuner + DSP + DAC solution. Use Value: Single-chip integration reduces PCB area by >40%, eliminates 12+ external filters and alignment components, and enables <300 µs channel switching for seamless RDS-guided station browsing. |
Use Scenario: Compact aftermarket stereo with support for FM, AM MW/LW/SW, and weather band in limited board space. IC Role / Device Role / Timing Role: Multi-band tuner with software-configurable mixer paths and adaptive DISS filtering - handles diverse antenna types and band requirements. Use Value: Dual AM mixer inputs and programmable AGC allow simultaneous optimization for MW broadcast and SW shortwave reception without hardware change. |
| Telematics-Enabled Navigation Radio | RDS-Traffic Message Channel (TMC) Receiver |
|
Use Scenario: In-vehicle navigation system requiring real-time traffic updates via RDS-TMC embedded in FM broadcast streams. IC Role / Device Role / Timing Role: RDS demodulator with group synchronization and block error correction - feeds decoded TMC data to host MCU over I²C/SPI. Use Value: Hardware-accelerated RDS parsing ensures sub-100 ms latency from signal capture to TMC packet delivery - critical for timely route recalculations. |
Use Scenario: Dedicated RDS-TMC receiver module deployed in fleet management terminals for centralized traffic monitoring. IC Role / Device Role / Timing Role: Standalone RDS front-end with interrupt-driven RDSINT pin signaling valid group lock - enables low-power polling architecture. Use Value: RDSINT assertion on group sync completion allows host processor to wake only when valid TMC data is ready - extends battery life in portable units. |
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 with wider frequency range (150 kHz–30 MHz); requires external crystal oscillator and separate audio codec. | Supports DRM, HD Radio, and shortwave beyond standard AM/FM; lacks integrated stereo DAC and RDS group sync hardware. | Select for multi-standard broadcast support where firmware flexibility outweighs BOM simplicity. |
| MAX2112 (Maxim Integrated) | Analog IF architecture with external IF filters; no integrated DSP, RDS, or stereo decoder - requires companion baseband processor. | Targeted at legacy designs needing discrete IF stage control; higher external component count and manual alignment. | Select only for retrofit projects maintaining existing analog IF signal chain and MCU-based RDS implementation. |
Compared with Si4790x and MAX2112, the TDA7705 provides the highest level of integration for cost-sensitive automotive AM/FM radios - combining VCO, PLL, IF-ADC, DSP, RDS, stereo decoder, and DAC in one LQFP64 package with zero external tuning components and automatic alignment.
Availability
TDA7705 is available at Aetrix Electronics and suitable for automotive infotainment systems, aftermarket head units, telematics navigation radios, and RDS-TMC receivers requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for TDA7705 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-grade analog, power, and microcontroller solutions with ISO/TS 16949-certified manufacturing and AEC-Q100 qualification programs.
The TDA7705 belongs to ST's automotive tuner IC product line, designed specifically to replace multi-chip AM/FM/RDS solutions in cost- and space-constrained car radio platforms while meeting stringent EMI, thermal, and reliability requirements.
FAQ
What crystal frequency does the TDA7705 require?
The TDA7705 requires a 37.05 MHz fundamental-mode crystal or a 3rd-overtone 37.05 MHz crystal connected between OSCin (Pin 51) and OSCout (Pin 50). The oscillator circuit is internal and does not require external load capacitors - simplifying layout and improving start-up reliability across temperature.
Does the TDA7705 support both I²C and SPI simultaneously?
No - the TDA7705 uses shared pins (SDA/SPI_MOSI and SCL/SPI_CLK) for I²C or SPI communication, selected at power-up via MODE (Pin 44) and boot configuration. Only one interface is active per power cycle; switching requires reset and reinitialization.
How is AM image rejection achieved without external filters?
AM image rejection is achieved through integrated image-rejection mixers with software-selectable input paths and automatic self-alignment of preselection and IF response - eliminating need for external ceramic or SAW filters while maintaining >55 dB image rejection across MW/LW bands.
Can the TDA7705 drive headphones directly?
No - DACoutL (Pin 53) and DACoutR (Pin 54) provide line-level analog outputs (typ. 1 Vpp into 10 kΩ) intended for connection to external audio amplifiers or codecs. Output current capability is limited to 1 mA; direct headphone driving would require external buffer amplification.
TDA7705 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tray
- Product Status:
- Active
- Frequency:
- -
- Sensitivity:
- -
- Data Rate (Max):
- -
- Modulation or Protocol:
- AM, FM
- Applications:
- Audio
- Current - Receiving:
- 220mA
- Data Interface:
- PCB, Surface Mount
- Memory Size:
- -
- Antenna Connector:
- PCB, Surface Mount
- Features:
- -
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-TQFP (10x10)
TDA7705 FAQ
1.How can I place an order for TDA7705 through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7705 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 TDA7705 reliable?
The price and inventory of TDA7705 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7705 is usually 5 days.
3.What payment methods are accepted for TDA7705?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7705 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7705?
TDA7705 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7705 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 TDA7705?
For technical support, including TDA7705 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7705 requirements.
6.How does Aetrix verify that TDA7705 is sourced from the original manufacturer or authorized distributors?
All TDA7705 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 TDA7705 meets industry standards.
7.What is the process for return or replacement of TDA7705?
All TDA7705 units undergo pre-shipment inspection (PSI). If there is an issue with TDA7705, 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 TDA7705 part is unused and in its original packaging.
Return procedure for TDA7705:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TDA7705 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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