Analog Devices Inc./Maxim Integrated MAX2120EVKIT+

Overview

MAX2120EVKIT+ from Maxim Integrated is an evaluation kit for the MAX2120 direct-conversion satellite tuner IC, designed to accelerate development of DVB-S and free-to-air receiver front-ends. It supports 925MHz–2175MHz RF input, delivers differential I/Q baseband outputs with programmable 4MHz–40MHz LPF bandwidth, and enables full register configuration via I²C interface for QPSK demodulator integration in DirecTV, Dish Network, and VSAT systems.

For engineers reviewing the MAX2120EVKIT+ datasheet, MAX2120EVKIT+ pinout, MAX2120EVKIT+ application, or MAX2120EVKIT+ equivalent, this kit provides validated reference design, calibrated RF path performance, real-time gain/LO/frequency-synthesizer control, and production-ready layout guidance for DBS tuner modules operating under +3.3V supply with <100mA active current draw.

Technical Context

The MAX2120EVKIT+ implements a complete signal chain around the MAX2120 IC, including impedance-matched 75Ω RFIN interface, low-noise +3.3V power distribution with per-rail 1nF bypassing, crystal oscillator circuitry (4–8MHz parallel-mode), and differential I/Q output termination optimized for 2kΩ//10pF demodulator inputs. All critical analog paths are isolated with dedicated ground planes and controlled-impedance routing.

It validates key MAX2120 features: VCO autoselect (VAS) operation across 925–2175MHz, 80dB total gain-control range (RF VGA + baseband VGA), ±1dB I/Q amplitude matching and <3.5° quadrature phase error at 500kHz, and 2-wire I²C programming of N/R dividers, LPF cutoff, and standby mode - all tested per Maxim's EV kit characterization conditions (TA = 0°C to +70°C, VCC = +3.3V ±5%).

Key Specifications

Availability

MAX2120EVKIT+ is available at Aetrix Electronics and suitable for satellite receiver development, DVB-S front-end prototyping, and VSAT system validation requiring stable component supply, traceable evaluation hardware, and documented reference design implementation.

Supply support for MAX2120EVKIT+ 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 solutions for communications, industrial, and consumer applications.

The MAX2120EVKIT+ belongs to Maxim's satellite tuner evaluation platform family, engineered to de-risk RF front-end design for DBS, DVB-S, and free-to-air receivers by delivering production-correlated measurement data, layout-verified signal integrity, and register-level firmware examples.

FAQ

What is the primary function of the MAX2120EVKIT+?

The MAX2120EVKIT+ is an evaluation kit for the MAX2120 direct-conversion satellite tuner IC. It provides a fully assembled, tested PCB that implements the complete RF-to-baseband signal path-including LNA, RF VGA, I/Q downconverters, programmable LPFs, and frequency synthesizer-enabling rapid validation of DVB-S and free-to-air receiver designs. The MAX2120EVKIT+ includes all necessary passive components, crystal oscillator, and I²C interface to configure the MAX2120 IC out-of-the-box.

Does the MAX2120EVKIT+ support multituner configurations?

Yes, the MAX2120EVKIT+ supports multituner configurations through the ADDR pin on the MAX2120 IC, which allows selection between two I²C addresses. This enables up to two MAX2120 devices-including those on separate MAX2120EVKIT+ boards-to share the same I²C bus without address conflict. The kit's schematic and layout follow Maxim's recommended isolation practices for co-located tuners, including independent power filtering and ground segmentation.

What RF input impedance does the MAX2120EVKIT+ use, and how is it matched?

The MAX2120EVKIT+ uses a 75Ω RF input impedance, consistent with satellite LNB output standards. Matching is achieved via a single DC-blocking capacitor at the RFIN pin (Pin 4), with no external matching network required-the MAX2120 IC's internal LNA and RF VGA are designed for direct 75Ω interface. Input return loss exceeds 12dB across 925–2175MHz per characterization data, verified on the MAX2120EVKIT+ using calibrated VNAs.

Can the MAX2120EVKIT+ be used to evaluate LO leakage and phase noise performance?

Yes, the MAX2120EVKIT+ is specifically configured to enable accurate LO leakage and phase noise measurements. Its layout minimizes coupling paths, includes low-noise +3.3V supplies with per-rail 1nF bypassing, and provides test points for VTUNE, CPOUT, and REFOUT. Published MAX2120EVKIT+ test data shows LO leakage < –75dBm at RF input and phase noise of –82dBc/Hz at 10kHz offset (fLO = 1500MHz), directly traceable to the kit's implementation.

Is the MAX2120EVKIT+ compatible with standard DVB-S demodulators?

Yes, the MAX2120EVKIT+ delivers differential I/Q baseband outputs (IOUT±, QOUT±) with 0.5–1VP-P swing, <±1dB amplitude imbalance, and <3.5° quadrature phase error-fully compliant with industry-standard DVB-S demodulator input requirements. Its AC-coupled outputs (via 47nF capacitors) and 2kΩ//10pF load interface match reference designs for STMicroelectronics STV0297, Broadcom BCM7346, and similar QPSK demodulators, as confirmed in Maxim's application notes and EV kit validation reports.