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Skyworks Solutions Inc. SI4703-C19-GMR
- Part No.:
- SI4703-C19-GMR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- RF Receivers
- Package:
- 20-UFQFN Exposed Pad
- Datasheet:
-
SI4703-C19-GMR.pdf
- Description:
- RF RCVR FM 76MHZ-108MHZ 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,085
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Product details
Overview
SI4703-C19-GMR from Skyworks is a single-chip FM radio receiver IC with integrated RDS/RBDS decoder, 76–108 MHz tuning range, 3.3 V supply operation, and I²C interface for host microcontroller control. It delivers stereo audio output and supports seek/tune functions in portable audio devices.
For engineers reviewing the SI4703-C19-GMR datasheet, SI4703-C19-GMR pinout, SI4703-C19-GMR application, or SI4703-C19-GMR equivalent, key selection considerations include RDS decoding capability, low-power standby mode (25 µA), integrated LNA and IF filter, and QFN-20 package compatibility with space-constrained PCB layouts.
Technical Context
The SI4703-C19-GMR implements a digital low-IF architecture with on-chip ADC, DSP-based demodulation, and RDS/RBDS data parsing. It uses a 32.768 kHz crystal for frequency reference and supports programmable channel spacing (100/200 kHz) and de-emphasis (50/75 µs).
Host communication occurs via standard I²C at up to 400 kHz; register configuration enables antenna diversity support, noise-blanking, and soft mute control. Audio output is delivered as analog line-level signals compatible with external amplifiers or codecs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Tuning Range | 76–108 MHz: covers global FM broadcast bands including Japan (76–90 MHz) and US/EU (87.5–108 MHz) |
| Sensitivity | 1.5 µV RMS: enables reliable reception with short monopole or PCB trace antennas |
| Supply Voltage | 2.7–3.6 V: compatible with single-cell Li-ion or 3.3 V system rails |
| Standby Current | 25 µA: supports battery-powered operation with extended idle time |
| Audio Output | Analog line-out (stereo): drives 10 kΩ load directly without external buffer |
| RDS Support | Full RDS/RBDS Group Type A–D decoding: provides station ID, program type, traffic announcements |
| Package | QFN-20, 4 mm × 4 mm, 0.5 mm pitch: surface-mount compatible with automated assembly |
Pinout & Package
SI4703-C19-GMR is housed in a 20-pin QFN package with exposed thermal pad. Pin assignments are validated per Skyworks' official datasheet revision 1.2 (2012).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | 3.3 V nominal supply; decoupling capacitor required at pin |
| GND | Ground reference | Common return for analog/digital sections; connects to thermal pad |
| SDIO | I²C data line | Open-drain bidirectional interface for register read/write |
| SCLK | I²C clock input | Host-generated clock; max 400 kHz for full configuration access |
| SEN | Chip select enable | Active-low; ties high internally if unused, enabling I²C-only mode |
| GPIO1–GPIO3 | General-purpose I/O | Configurable as interrupt outputs or status indicators (e.g., RDS ready) |
| LOUT/ROUT | Analog audio outputs | DC-coupled line-level stereo outputs; require AC coupling before amplification |
| ANT | RF input | High-impedance node for direct connection to ferrite rod or PCB loop antenna |
Key Features
| Feature | Design Value |
|---|---|
| Digital low-IF architecture | Eliminates external IF filters and image-reject components, reducing BOM count by ≥4 passive parts |
| Integrated RDS/RBDS decoder | Offloads host MCU from real-time bit-stream parsing; supports PTY, PS, RT, TA decoding |
| Programmable de-emphasis | Selectable 50 µs (EU) or 75 µs (US) time constant via register write, no hardware change needed |
| Low-power standby mode | 25 µA quiescent current enables >1-year battery life in coin-cell–powered remote controls |
| On-chip LNA and AGC | Adjusts gain dynamically across signal strengths; maintains SNR >50 dB over 60 dB input range |
Applications
| Portable FM Radios | Automotive Auxiliary Tuners |
|---|---|
Use Scenario: Handheld battery-powered FM radio with LCD display and speaker output. IC Role / Device Role / Timing Role: Primary FM receiver and RDS decoder; handles RF front-end, demodulation, and metadata extraction. Use Value: Enables compact form factor with single-chip integration, eliminating discrete tuner + decoder + IF filter subsystem. | Use Scenario: Aftermarket car audio adapter that adds FM reception to legacy head units via AUX input. IC Role / Device Role / Timing Role: Standalone FM front-end feeding line-level analog audio to external amplifier. Use Value: Provides RDS station name display and traffic announcement alerts without modifying host head unit firmware. |
| USB-Powered Desktop Radios | IoT Smart Speakers |
Use Scenario: Plug-and-play desktop radio powered via USB 5 V with internal 3.3 V LDO. IC Role / Device Role / Timing Role: Core FM receiver with I²C-controlled tuning and seek functionality. Use Value: Delivers consistent audio quality across varying USB source voltages using internal regulated biasing. | Use Scenario: Voice-assistant speaker with dual-function audio path: voice input + FM broadcast playback. IC Role / Device Role / Timing Role: Secondary audio source managed alongside primary codec; shares I²C bus with main SoC. Use Value: Allows concurrent voice processing and FM listening via time-multiplexed I²C access and fast channel switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FM receiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI4702-C19-GMR | Omits RDS/RBDS decoder; identical RF performance and pinout | Suitable only where station metadata is not required | Choose SI4702-C19-GMR when RDS functionality is unnecessary and BOM cost reduction is prioritized |
| TEF6686HN/V1T | Wider tuning range (64–108 MHz), supports AM/LW/SW, higher integration (audio DAC, DSP) | Requires additional power sequencing and larger PCB footprint | Choose TEF6686HN/V1T when multi-band (AM/FM) and embedded audio processing are needed |
Compared with SI4702-C19-GMR, the SI4703-C19-GMR adds RDS decoding without changing layout or power design; versus TEF6686HN/V1T, it offers lower system complexity and smaller footprint for FM-only use cases.
Availability
SI4703-C19-GMR is available at Aetrix Electronics and suitable for portable audio devices, automotive infotainment accessories, and USB-powered consumer radios requiring stable component supply and long-term production support.
Supply support for SI4703-C19-GMR 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
Skyworks Solutions is a global semiconductor company specializing in analog and mixed-signal connectivity solutions for wireless, automotive, and industrial markets.
The SI470x family was designed for highly integrated, low-power FM radio reception in space- and cost-constrained consumer electronics, emphasizing single-chip simplicity and RDS-ready deployment.
FAQ
What is the operating voltage range for the SI4703-C19-GMR?
The SI4703-C19-GMR operates from 2.7 V to 3.6 V. This range supports common single-cell lithium-ion batteries and standard 3.3 V system rails. Operation outside this window may cause improper initialization or loss of RDS decoding functionality. The SI4703-C19-GMR includes internal regulation to maintain stable biasing across the full supply range.
Does the SI4703-C19-GMR require an external crystal?
Yes, the SI4703-C19-GMR requires a 32.768 kHz crystal connected between XIN and XOUT pins for accurate frequency synthesis and RDS timing. A load capacitance of 12.5 pF is specified. Omitting or misconfiguring this crystal results in failed channel locking and corrupted RDS data in the SI4703-C19-GMR.
Can the SI4703-C19-GMR be used without RDS functionality?
Yes, the SI4703-C19-GMR functions fully as an FM receiver even when RDS is disabled via register configuration. All tuning, seek, audio output, and signal strength reporting remain operational. Disabling RDS reduces host processor overhead but does not alter the behavior or performance of the SI4703-C19-GMR's core RF path.
What antenna types are compatible with the SI4703-C19-GMR?
The SI4703-C19-GMR supports ferrite rod antennas, PCB trace antennas, and wire antennas via its high-impedance ANT pin. Matching network design depends on antenna type: ferrite rods typically require no external components, while PCB traces may need series inductance for resonance. Antenna performance directly impacts sensitivity metrics quoted for the SI4703-C19-GMR.
Is the SI4703-C19-GMR pin-compatible with earlier Si4700-series variants?
Yes, the SI4703-C19-GMR shares identical pinout and package (QFN-20) with SI4702-C19-GMR and SI4701-C19-GMR. Register maps differ slightly-especially in RDS-related addresses-but mechanical and electrical interface compatibility allows drop-in replacement where firmware accommodates the SI4703-C19-GMR's extended feature set.
SI4703-C19-GMR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 20-UFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Frequency:
- 76MHz ~ 108MHz
- Sensitivity:
- -
- Data Rate (Max):
- -
- Modulation or Protocol:
- FM
- Applications:
- General Purpose
- Current - Receiving:
- 14.4mA
- Data Interface:
- PCB, Surface Mount
- Memory Size:
- -
- Antenna Connector:
- PCB, Surface Mount
- Features:
- -
- Voltage - Supply:
- 2.7V ~ 5.5V
- Operating Temperature:
- -20°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x3)
SI4703-C19-GMR FAQ
1.How can I place an order for SI4703-C19-GMR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI4703-C19-GMR 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 SI4703-C19-GMR reliable?
The price and inventory of SI4703-C19-GMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI4703-C19-GMR is usually 5 days.
3.What payment methods are accepted for SI4703-C19-GMR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI4703-C19-GMR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI4703-C19-GMR?
SI4703-C19-GMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI4703-C19-GMR 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 SI4703-C19-GMR?
For technical support, including SI4703-C19-GMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI4703-C19-GMR requirements.
6.How does Aetrix verify that SI4703-C19-GMR is sourced from the original manufacturer or authorized distributors?
All SI4703-C19-GMR 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 SI4703-C19-GMR meets industry standards.
7.What is the process for return or replacement of SI4703-C19-GMR?
All SI4703-C19-GMR units undergo pre-shipment inspection (PSI). If there is an issue with SI4703-C19-GMR, 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 SI4703-C19-GMR part is unused and in its original packaging.
Return procedure for SI4703-C19-GMR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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