The MAX2106 low-cost, direct-conversion tuner IC is designed for use in digital direct-broadcast satellite (DBS) television set-top box units and is a pin-for-pin upgrade for the MAX2104. Its direct-conversion architecture reduces system cost compared to devices with IF-based architectures. The MAX2106 directly tunes L-band signals to baseband using a broadband I/Q downconverter. The operating frequency range spans 925MHz to 2175MHz.
The IC includes a low-noise amplifier (LNA) with gain control, I and Q downconverting mixers, lowpass filters with gain and frequency control, a local oscillator (LO) buffer with a 90° quadrature network, and a charge-pump-based phase-locked loop (PLL) for frequency control. The MAX2106 has an on-chip LO, requiring only an external varactor-tuned LC tank for operation. The LO's output drives the internal quadrature generator and has a buffer amplifier to drive off-chip circuitry. The MAX2106 comes in a 48-pin thin quad flat-pack package with exposed paddle (EP).
Advantages Over MAX2104
Improved Front End Achieves 10.2dB NF at 1550MHz
Higher Input IIP3: 11.5dBm at 1550MHz
Reduced Spurious Downconversion Products
Capable of Using an External Synthesizer
Drop-In Replacement for MAX2104 Designs:
Requires Only Minor Software Upgrade and
Two External Resistor Value Changes
Complete Low-Cost Solution for DBS Direct Downconversion
High Level of Integration Minimizes Component Count
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