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Microchip Technology MICRF213AYQS-TR
- Part No.:
- MICRF213AYQS-TR
- Manufacturer:
- Microchip Technology
- Category:
- RF Receivers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MICRF213AYQS-TR.pdf
- Description:
- RF RX AM/OOK 300-350MHZ 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,973
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Product details
Overview
MICRF213AYQS-TR from Micrel is a 3.3V super-heterodyne OOK/ASK RF receiver IC operating at 315MHz with –110dBm sensitivity (1kbps, BER 10⁻²), 3.9mA supply current, and programmable demodulator bandwidth (1.18–9.44kHz). It integrates image-reject mixing, on-chip AGC, analog RSSI output, and requires only two external capacitors (CTH, CAGC) plus a crystal for full operation in remote keyless entry and wireless sensor nodes.
For engineers reviewing the MICRF213AYQS-TR datasheet, MICRF213AYQS-TR pinout, MICRF213AYQS-TR application, or MICRF213AYQS-TR equivalent, this page delivers verified technical context, exact pin functions, real-world filter bandwidth selection logic, RSSI transfer characteristics (25mV/dB), and validated alternatives for ASK/OOK 315MHz receiver design.
Technical Context
The MICRF213AYQS-TR implements a low-side injection super-heterodyne architecture with a 32× PLL synthesizer locked to a 9.81563MHz crystal, producing a 314.1MHz LO and 0.86MHz IF. Its integrated image-reject mixer achieves 20dB image rejection, while the third-order band-pass IF filter (235kHz BW at 315MHz) precedes four gain-controlled amplifier stages.
Demodulation uses envelope detection followed by a digitally selectable 4-band low-pass filter (1.18/2.36/4.72/9.44kHz), slicer with CTH-set threshold, and squelch control via SQ pin. AGC dynamically adjusts gain using CAGC capacitor (≥0.47µF) with 1.13–1.70V output swing across –50dBm to –110dBm input range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency | 315MHz RF input; supports 300–350MHz range with scaling |
| Sensitivity | –110dBm at 1kbps Manchester encoding, BER 10⁻² |
| Supply Current | 3.9mA typical (continuous operation, 315MHz) |
| Demod BW Options | 1.18kHz / 2.36kHz / 4.72kHz / 9.44kHz (SEL0/SEL1 controlled) |
| RSSI Output | Analog voltage: 0.4V @ –110dBm to 1.9V @ –50dBm; slope 25mV/dB |
| Shutdown Current | 0.33µA (SHDN = high) |
| Input Impedance | 32.5 – j235Ω at 315MHz (requires L/C matching network) |
Pinout & Package
Package: 16-pin QSOP (QS), RoHS-compliant, moisture-sensitive level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RO1 | Crystal oscillator input | Colpitts resonator connection; accepts 1.5Vp-p max external reference |
| 2,4 GNDRF | RF ground | Dedicated negative supply for ANT input stage; separate from digital GND |
| 3 ANT | RF signal input | AC-coupled 50Ω-matched port; requires external L/C matching network |
| 5 VDD | Positive supply | +3.0V to +3.6V for all internal blocks; decoupling required |
| 6 SQ | Squelch control | Active-low logic input; suppresses noise-induced false triggers on DO |
| 7,11 SEL0/SEL1 | Filter bandwidth select | Binary-coded inputs selecting one of four demod LPF bandwidths |
| 8 SHDN | Shutdown control | Active-high logic input; reduces current to 0.33µA when asserted |
| 9 GND | Digital ground | Common return for VDD, DO, RSSI, and control logic |
| 10 DO | Data output | CMOS-compatible OOK/ASK demodulated data; 260µA source / 600µA sink |
| 12 CTH | Threshold capacitor | External capacitor (≥1nF) sets slicer threshold settling time and duty-cycle response |
| 13 CAGC | AGC filter capacitor | External capacitor (≥0.47µF) sets AGC loop dynamics and gain range |
| 14 RSSI | Signal strength output | Analog voltage buffer (200Ω ZOUT) proportional to received power |
| 15 NC | No connect | Must be tied to GND per datasheet; not internally connected |
| 16 RO2 | Crystal oscillator input | Second resonator terminal; 7pF parallel capacitance with MOS switch to GND |
Key Features
| Feature | Design Value |
|---|---|
| Integrated image-reject mixer | 20dB image suppression eliminates need for external IF filtering |
| Programmable demodulator bandwidth | Four hardware-selectable LPF settings (1.18–9.44kHz) match data rate and encoding |
| Analog RSSI output | Linear 25mV/dB response over 60dB dynamic range enables link margin monitoring |
| Low external component count | Only crystal, CTH, and CAGC required; no IF filters or discrete AGC components |
| Robust startup sequence | RC delay network on SHDN ensures correct POR initialization under slow VDD ramp |
Applications
| Remote Keyless Entry (RKE) | Wireless Sensor Nodes |
|---|---|
Use Scenario: Vehicle door lock/unlock command reception at 315MHz with Manchester-encoded OOK bursts. IC Role / Device Role / Timing Role: Primary ASK demodulator with squelch-enabled data recovery and RSSI-based signal validation. Use Value: –110dBm sensitivity enables reliable reception at >10m range; programmable filter rejects adjacent-channel interference during short preamble bursts. | Use Scenario: Battery-powered temperature/humidity sensor transmitting periodic ASK packets in industrial environments. IC Role / Device Role / Timing Role: Low-power RF front-end with shutdown mode (0.33µA) and RSSI-assisted adaptive wake-up. Use Value: 3.9mA active current and hardware shutdown extend coin-cell life; CTH/CAGC tuning optimizes for variable duty-cycle telemetry payloads. |
| Garage Door Openers | Industrial Remote Controls |
Use Scenario: Bidirectional garage opener with legacy 315MHz ASK transmitter and noise-prone installation. IC Role / Device Role / Timing Role: High-selectivity receiver with image-reject mixer and analog RSSI for SNR estimation. Use Value: 235kHz IF bandwidth and 20dB image rejection suppress out-of-band EMI from motors and switching supplies. | Use Scenario: Factory-floor handheld remote controlling machinery via short OOK command frames. IC Role / Device Role / Timing Role: Data slicer with CTH-set threshold and squelch logic to reject burst noise in electrically noisy plants. Use Value: SQ pin activation eliminates false triggers during welding or VFD operation; DO output drives standard logic interfaces directly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ASK/OOK receiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SYN115-315 | 315MHz ASK receiver; –105dBm sensitivity; fixed 2.5kHz filter; no RSSI output | Lacks programmable bandwidth and analog RSSI; simpler BOM but less flexible in noisy environments | Choose SYN115-315 for cost-sensitive, fixed-data-rate RKE where RSSI and filter tuning are unnecessary |
| CC1101RGPR | Multi-band (300–348MHz) sub-1GHz transceiver; –116dBm sensitivity; SPI interface; requires external MCU control | Full transceiver vs. RX-only; supports GFSK/MSK/ASK; higher integration but greater system complexity | Choose CC1101RGPR when bidirectional communication, protocol flexibility, or regulatory compliance beyond OOK is required |
Compared with SYN115-315, the MICRF213AYQS-TR provides superior sensitivity (–110dBm vs. –105dBm), configurable filtering, and RSSI feedback-critical for adaptive link budgeting. Against CC1101RGPR, it offers lower system-level complexity and zero firmware overhead for pure OOK receive, though without transmit capability or multi-modulation support.
Availability
MICRF213AYQS-TR is available at Aetrix Electronics and suitable for remote keyless entry, wireless sensor nodes, garage door openers, and industrial remote controls requiring stable component supply across automotive-grade temperature ranges (–40°C to +105°C).
Supply support for MICRF213AYQS-TR 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
Micrel Inc. was a U.S.-based semiconductor company specializing in high-performance analog, RF, and timing solutions before its acquisition by Microchip Technology in 2015.
The MICRF213AYQS-TR belongs to Micrel's QwikRadio® family of integrated UHF receivers, designed specifically for low-cost, low-power ASK/OOK systems in automotive, security, and industrial wireless links.
FAQ
What is the recommended crystal specification for MICRF213AYQS-TR?
The MICRF213AYQS-TR requires a 9.81563MHz fundamental-mode quartz crystal with 10pF load capacitance, ±30ppm stability, ESR < 50Ω, and –40°C to +105°C operating range. Micrel recommends HIB part SA-9.815630-F-10-H-30-30-X. Stray capacitance near RO1/RO2 pins must be minimized to ensure reliable oscillator startup within 1–2ms.
How does the MICRF213AYQS-TR achieve image rejection without external filters?
The MICRF213AYQS-TR integrates a quadrature image-reject down-converter architecture with on-chip IF filtering. Its low-side injection LO (314.1MHz for 315MHz RF) places the image at 313.24MHz, which is suppressed by 20dB through internal mixer topology and third-order band-pass filtering centered at 0.86MHz with 235kHz bandwidth.
What is the function of the CTH capacitor on MICRF213AYQS-TR?
The CTH capacitor (pin 12) sets the time constant for the data slicer's threshold voltage, which determines how rapidly the demodulator adapts to changing signal amplitude and duty cycle. Recommended values range from 10nF (for 9.44kHz BW, 7.2kbps) to 100nF (for 1.18kHz BW, 1kbps), with ≥1nF minimum to ensure stable slicing under variable burst conditions.
Can MICRF213AYQS-TR operate outside the 315MHz band?
Yes-the MICRF213AYQS-TR supports 300–350MHz operation. Filter bandwidths and IF characteristics scale linearly with frequency; for example, at 303.825MHz, the IF bandwidth becomes 228kHz and demod BW options shift to 1.14–9.1kHz. Crystal frequency must be recalculated as FREFOSC = FRF/(32 + 1.1/12) to maintain LO accuracy.
Why does MICRF213AYQS-TR require an RC network on the SHDN pin?
A dedicated RC network (e.g., 10Ω + 4.7µF) on SHDN ensures proper power-on reset (POR) sequencing: it delays SHDN assertion relative to VDD ramp-up, preventing activation of an internal test bus pull-down that corrupts register initialization. Without it, the device may fail to start, exhibiting chatter on DO or no demodulation even with strong RF input.
MICRF213AYQS-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Frequency:
- 300MHz ~ 350MHz
- Sensitivity:
- -110dBm
- Data Rate (Max):
- 7.2kbps
- Modulation or Protocol:
- AM, OOK
- Applications:
- ISM, Garage Door Openers, RKE
- Current - Receiving:
- 3.9mA
- Data Interface:
- PCB, Surface Mount
- Memory Size:
- -
- Antenna Connector:
- PCB, Surface Mount
- Features:
- -
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
MICRF213AYQS-TR FAQ
1.How can I place an order for MICRF213AYQS-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MICRF213AYQS-TR 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 MICRF213AYQS-TR reliable?
The price and inventory of MICRF213AYQS-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MICRF213AYQS-TR is usually 5 days.
3.What payment methods are accepted for MICRF213AYQS-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MICRF213AYQS-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MICRF213AYQS-TR?
MICRF213AYQS-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MICRF213AYQS-TR 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 MICRF213AYQS-TR?
For technical support, including MICRF213AYQS-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MICRF213AYQS-TR requirements.
6.How does Aetrix verify that MICRF213AYQS-TR is sourced from the original manufacturer or authorized distributors?
All MICRF213AYQS-TR 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 MICRF213AYQS-TR meets industry standards.
7.What is the process for return or replacement of MICRF213AYQS-TR?
All MICRF213AYQS-TR units undergo pre-shipment inspection (PSI). If there is an issue with MICRF213AYQS-TR, 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 MICRF213AYQS-TR part is unused and in its original packaging.
Return procedure for MICRF213AYQS-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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