Direct-Conversion to Low-IF Tuners for Digital Audio Broadcast

 

Part Number	Replacement	Explanation

Description

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The MAX2170/MAX2171 direct-conversion to low-IF tuners are designed for Digital Audio Broadcast (DAB) and Terrestrial Digital Multimedia Broadcast (T-DMB) applications, covering an input frequency range of 168MHz to 240MHz (VHF-III), 1452MHz to 1492MHz (L-Band), and also 87MHz to 108MHz (FM). The MAX2170/MAX2171 achieve a high level of component integration, allowing low-power, tuner-on-board designs. The direct-conversion to low-IF architecture eliminates the need for an IF-SAW filter while providing a balanced 2.048MHz center frequency baseband output to the demodulator.

The MAX2170 provides a buffered reference clock at the crystal frequency, while the MAX2171 outputs a reference at 1/3rd of the crystal frequency. A sigma-delta fractional-N synthesizer is incorporated to optimize both close-in and wideband phase noise performances for OFDM applications where sensitivity to both 1kHz phase noise and wideband phase noise related to strong adjacents can be a problem.

The MAX2170/MAX2171 are available in a 40-pin thin QFN package (6mm x 6mm) with an exposed paddle. Electrical performance is guaranteed over the extended -40°C to +85°C temperature range.

Key Features

• +2.7V to +3.5V Supply Voltage Range
• Low-IF Output Eliminates IF-SAW Filter
• Integrated Low-IF Bandpass Filter
• Sigma-Delta Fractional-N Synthesizer
• +45dB Digital ACPR
• 3.5dB Typical Noise Figure for VHF-III (Includes On-Chip Tracking Filter)
• 3.1dB Typical Noise Figure for L-Band
• VHF-III Sensitivity of -100dBm
• L-Band Sensitivity of -99dBm
• Baseband Overload Detector Controls RF AGC

Applications/Uses

• Fixed and Mobile Digital Audio Broadcast (DAB)
• Terrestrial Digital Multimedia Broadcast (T-DMB)