MAX2121ETI+T

Overview

The MAX2121ETI+T is a complete direct-conversion L-band tuner IC designed for satellite set-top and VSAT applications. It directly converts satellite signals from the LNB to baseband using a broadband I/Q downconverter. The device operates within a frequency range of 925MHz to 2175MHz. Key electrical parameters include a monolithic VCO with low phase noise of -97dBc/Hz at 10kHz, requiring no calibration. It supports a high dynamic range from -75dBm to 0dBm and features integrated LP filters at 123.75MHz. The component functions on a single +3.3V ±5% supply voltage.

Feature Summary

• Direct conversion architecture utilizing a broadband I/Q downconverter for signal processing
• Integrated monolithic VCO delivering low phase noise without calibration requirements
• Built-in low-pass filters operating at 123.75MHz for baseband signal conditioning
• Supports differential I/Q interface alongside an I2C 2-wire serial control interface

Applications

• VSAT systems
• Satellite set-top boxes
• L-band tuner modules

Procurement Notes

Verify that the suffix 'T' indicates tape-and-reel packaging when placing orders. Confirm the specific variant matches the required application, as other versions like MAX2121B may offer programmable baseband filters. Ensure the supplier provides official documentation from Analog Devices or Maxim Integrated to guarantee authenticity. Check RoHS compliance status if environmental regulations apply to your manufacturing process.

Selection Notes

Select this component for designs requiring a cost-effective, complete L-band solution. The integrated VCO and filters reduce external component count compared to discrete solutions. Consider the 28-pin TQFN package size for space-constrained PCB layouts. Evaluate the single +3.3V supply requirement against system power constraints. Verify compatibility with existing I2C control logic for tuner configuration.

Part Context

The MAX2121 series represents a family of direct-conversion tuners optimized for satellite communications. The ETI+ variant specifically denotes the standard version with fixed internal filtering. This part is manufactured by Analog Devices Inc., formerly Maxim Integrated. It belongs to the RF and wireless category, focusing on L-band frequencies essential for satellite downlink reception in consumer and professional equipment.

Replacement Considerations

The MAX2121BETI+ is a documented alternative within the same family. Note that the MAX2121B variant includes a programmable baseband filter, differing from the fixed filter of the MAX2121ETI+. Verify pinout and software compatibility before substitution, as functional differences exist between the standard and B-series variants.