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Analog Devices Inc./Maxim Integrated MAX2371EGC+T
- Part No.:
- MAX2371EGC+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- RF Amplifiers
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
MAX2371EGC+T.pdf
- Description:
- IC RF AMP 100MHZ-1GHZ 12QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,390
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Product details
Overview
MAX2371EGC+T from Maxim Integrated is a wideband low-noise amplifier (LNA) IC designed for direct conversion receiver (DCR) and very low IF (VLIF) architectures. It delivers 15dB nominal small-signal gain, 1.8dB typical noise figure, 40dB reverse isolation, and operates from 100MHz to 1GHz with 2.65V–3.3V single-supply operation. It serves as the front-end RF gain stage in cellular infrastructure, ISM-band receivers, and portable DCR systems.
For engineers reviewing the MAX2371EGC+T datasheet, MAX2371EGC+T pinout, MAX2371EGC+T application, or MAX2371EGC+T equivalent, key selection criteria include its 45dB AGC range excluding step attenuator, 20dB programmable RF attenuation step, adjustable 2.5–3.5mA supply current, and QFN-EP package compatibility with high-density RF layouts.
Technical Context
The MAX2371EGC+T integrates a single-ended LNA with dual-mode bias control (via LNA_I), switchable 20dB RF attenuator (via RF_ATTN), and continuous analog AGC (0–3.3V at AGC pin). Its exponential converter-based AGC achieves linear dB/V response (35–45dB/V) over a 45dB control range while maintaining stable S-parameters across temperature.
It supports dynamic reconfiguration: high-current/high-gain mode (LNA_I = VCC) yields 15dB gain and 1.8dB NF; low-current mode (LNA_I = GND) reduces current to 2.5mA with trade-offs in gain and linearity. The RF input (LNA_IN) and output (LNA_OUT) require external 50Ω matching networks optimized per band-e.g., 136–174MHz for MAX2371 or 850–940MHz for MAX2373.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Noise Figure | 1.8dB typical - enables high sensitivity in weak-signal DCR applications without degrading SNR |
| Small-Signal Gain | 15dB nominal - provides sufficient first-stage amplification before mixer in VLIF/DCR signal chains |
| RF Frequency Range | 100MHz to 1GHz - covers VHF/UHF bands used in FM radio, ISM, and cellular front-ends |
| AGC Range | 45dB excluding step attenuator - allows wide dynamic range handling without saturation in varying RF environments |
| Supply Voltage | 2.65V to 3.3V - compatible with modern low-voltage RF subsystems and battery-powered designs |
| Supply Current | 3.5mA typical, adjustable down to 2.5mA - supports power-constrained portable and IoT receiver modules |
| Reverse Isolation | 40dB - minimizes LO leakage and output-to-input coupling critical in direct-conversion architectures |
Pinout & Package
MAX2371EGC+T is housed in a 12-pin QFN-EP (exposed pad) package (package code G1233-1), measuring 3mm × 3mm × 0.8mm with thermal-enhanced grounding via the exposed pad. This compact, low-inductance package supports high-frequency stability and efficient heat dissipation in dense RF PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LNA_IN (Pin 1) | RF Input | Single-ended RF port requiring DC-blocking capacitor and external 50Ω matching network |
| LNA_E (Pin 2) | LNA Emitter | Connects to ground via band-specific inductor (e.g., 33nH for 150MHz); sets gain/linearity trade-off |
| RX_EN (Pin 3) | Enable Control | Active-high digital input; disables LNA core when low, enabling transmit-mode power saving |
| RF_ATTN (Pin 4) | Attenuator Select | Digital control for 20dB gain step: low = high-gain mode, high = low-gain mode for strong-signal immunity |
| AGC (Pin 5) | Analog Gain Control | Voltage-controlled AGC input (0–3.3V); 1.275V–2.575V range gives 35–45dB attenuation with linear dB/V slope |
| LNA_I (Pin 6) | Bias Current Select | Digital control for quiescent current: high = 3.5mA/15dB/1.8dB NF, low = 2.5mA with reduced performance |
| LNA_OUT (Pin 7) | RF Output | Open-collector output requiring pull-up inductor to LNA_VCC and external 50Ω matching |
| LNA_VCC (Pin 8) | AGC Amplifier Supply | Dedicated 2.65–3.3V supply for AGC circuitry; bypassed separately with 1500pF capacitor |
| AGC_BYP (Pin 9) | AGC Filter Node | Connects to ground via capacitor to set AGC loop bandwidth and transient response |
| RSET (Pin 10) | Bias Reference | Connects to ground via precision resistor (typically 1.1kΩ) to set internal reference current (50–100µA) |
| RF_VCC (Pin 11) | LNA Core Supply | Dedicated 2.65–3.3V supply for LNA transistor core; bypassed separately with 1500pF capacitor |
| GND (Pin 12) | Ground | Main signal ground; exposed pad internally connected to GND and must be soldered to large ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Switchable 20dB RF attenuator | Enables robust strong-signal handling by shifting operating point before AGC compression occurs |
| 45dB continuous analog AGC range | Provides precise, linear-in-dB gain control independent of RF_ATTN state for adaptive receiver design |
| Two LNA bias modes (high/low current) | Allows dynamic power/performance scaling: 3.5mA for max sensitivity or 2.5mA for battery life extension |
| 40dB reverse isolation (S12) | Reduces LO feedthrough and self-interference in zero-IF receivers, improving image rejection |
| QFN-EP thermal package | Ensures stable RF performance under sustained operation via low-thermal-resistance path to PCB ground |
Applications
| Cellular Base Station Receiver | ISM-Band Wireless Sensor Hub |
|---|---|
Use Scenario: Receives uplink signals in 850–940MHz bands from multiple low-power IoT nodes in industrial settings. IC Role / Device Role / Timing Role: Front-end LNA providing first-stage amplification and AGC stabilization before quadrature demodulation. Use Value: 1.8dB NF and 45dB AGC range maintain link budget integrity despite variable path loss and interferer density. | Use Scenario: Processes 902–928MHz sensor data in battery-operated gateways deployed in remote locations. IC Role / Device Role / Timing Role: Low-power LNA enabling extended sleep cycles while preserving fast wake-up RF readiness. Use Value: Adjustable 2.5–3.5mA supply current and RX_EN shutdown reduce average system power below 10µA in standby. |
| FM Radio Tuner Module | Portable DCR Test Equipment |
Use Scenario: Captures 87.5–108MHz broadcast signals in handheld audio receivers with minimal external components. IC Role / Device Role / Timing Role: Single-ended LNA with integrated AGC and attenuator simplifying front-end design versus discrete solutions. Use Value: 15dB gain and 20dB step attenuator eliminate need for external switches or variable gain stages in compact tuners. | Use Scenario: Used in handheld spectrum analyzers requiring rapid gain reconfiguration during field measurements. IC Role / Device Role / Timing Role: Programmable LNA supporting real-time AGC voltage sweeps and digital gain-mode toggling via MCU GPIOs. Use Value: Pin-compatible digital controls (LNA_I, RF_ATTN, RX_EN) enable deterministic firmware-driven gain calibration sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX2373EGC+T | Optimized for 850–940MHz (vs. MAX2371's 100–1000MHz); higher NF (1.06–1.15dB) and lower gain (14–17dB) in target band | Preferred for narrowband cellular front-ends where MAX2371's wideband noise floor is unnecessary | Select MAX2373EGC+T when operating strictly within 850–940MHz and prioritizing band-specific linearity over ultra-low NF |
| SKY65167-378LF | Fixed-gain (16.5dB), no AGC or attenuator; 1.3dB NF at 900MHz; requires external bias control | Suitable for static-gain applications like fixed-channel repeaters where gain stability outweighs dynamic range needs | Choose SKY65167-378LF only if AGC/attenuation functionality is not required and board space permits external bias network |
Compared with MAX2373EGC+T and SKY65167-378LF, the MAX2371EGC+T uniquely combines wideband coverage (100–1000MHz), integrated 45dB analog AGC, and switchable 20dB attenuator-making it optimal for multi-band, adaptive receiver designs where flexibility and dynamic range are critical.
Availability
MAX2371EGC+T is available at Aetrix Electronics and suitable for cellular infrastructure, ISM-band wireless sensor hubs, and portable DCR test equipment requiring stable component supply and long-term production continuity.
Supply support for MAX2371EGC+T 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
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and RF ICs for communications, industrial, and consumer applications.
The MAX2371/MAX2373 product line was engineered specifically for direct-conversion and VLIF receiver front-ends, emphasizing low noise, wide dynamic range, and flexible bias/attenuation control in compact QFN packages.
FAQ
What is the operating frequency range of the MAX2371EGC+T?
The MAX2371EGC+T operates from 100MHz to 1GHz. While usable across this full range, its performance is optimized for specific bands-e.g., 136–174MHz (VHF) and 450MHz (UHF)-with external matching networks. The device's S-parameters and noise figures are characterized at 150MHz for MAX2371, confirming validated operation in those sub-bands. MAX2371EGC+T does not guarantee specified performance across the entire 100MHz–1GHz span without appropriate tuning.
How does the AGC function work on the MAX2371EGC+T?
The MAX2371EGC+T implements continuous analog AGC via the AGC pin (Pin 5), accepting a 0–3.3V control voltage. At VCC/2 (~1.39V), the LNA operates at maximum gain; at VCC – 200mV (~3.1V), it reaches minimum gain. The AGC attenuation range is 45dB, with a linear dB/V slope of 35–45dB/V. This control is independent of RF_ATTN and LNA_I states, allowing simultaneous use of step attenuation and fine AGC adjustment. MAX2371EGC+T maintains this behavior across –40°C to +85°C.
What is the purpose of the LNA_I pin on the MAX2371EGC+T?
The LNA_I pin (Pin 6) selects between two quiescent bias points: high-current mode (LNA_I = VCC) delivers 3.5mA supply current, 15dB gain, and 1.8dB noise figure; low-current mode (LNA_I = GND) reduces current to 2.5mA with corresponding degradation in gain and NF. This digital control enables dynamic power/performance scaling-e.g., switching to low-current mode during strong-signal conditions to extend battery life without disabling the LNA. MAX2371EGC+T defaults to high-current mode if LNA_I is left unconnected.
Can the MAX2371EGC+T be used in a 50Ω matched system?
Yes, the MAX2371EGC+T is designed for 50Ω systems. Both LNA_IN (Pin 1) and LNA_OUT (Pin 7) require external matching networks to achieve 50Ω impedance-typically using series/shunt capacitors and inductors as shown in Maxim's EV kit schematics. The chip's S-parameters (e.g., S11 < –10dB at 150MHz) confirm good input return loss when properly matched. MAX2371EGC+T's performance metrics-including gain, NF, and IP3-are all specified with 50Ω source and load terminations.
What is the role of the RSET pin on the MAX2371EGC+T?
The RSET pin (Pin 10) connects to ground via a precision resistor (typically 1.1kΩ) to set the internal reference bias current (50–100µA), which calibrates the AGC amplifier's transconductance and ensures accurate gain control linearity. This resistor directly impacts AGC slope consistency and temperature stability. MAX2371EGC+T datasheet specifies RSET tolerance requirements (±1%) to maintain guaranteed 45dB AGC range and ±10% dB/V linearity over temperature.
MAX2371EGC+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 12-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Frequency:
- 100MHz ~ 1GHz
- P1dB:
- 19.5dBm
- Gain:
- 14.5dB
- Noise Figure:
- -
- RF Type:
- -
- Voltage - Supply:
- 2.65V ~ 3.3V
- Current - Supply:
- 3.5mA
- Test Frequency:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-QFN (3x3)
MAX2371EGC+T FAQ
1.How can I place an order for MAX2371EGC+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX2371EGC+T 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 MAX2371EGC+T reliable?
The price and inventory of MAX2371EGC+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX2371EGC+T is usually 5 days.
3.What payment methods are accepted for MAX2371EGC+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX2371EGC+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX2371EGC+T?
MAX2371EGC+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX2371EGC+T 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 MAX2371EGC+T?
For technical support, including MAX2371EGC+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX2371EGC+T requirements.
6.How does Aetrix verify that MAX2371EGC+T is sourced from the original manufacturer or authorized distributors?
All MAX2371EGC+T 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 MAX2371EGC+T meets industry standards.
7.What is the process for return or replacement of MAX2371EGC+T?
All MAX2371EGC+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX2371EGC+T, 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 MAX2371EGC+T part is unused and in its original packaging.
Return procedure for MAX2371EGC+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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