MAX2171:Direct-Conversion to Low-IF Tuners for Digital Audio Broadcast

Highest Performance, Most Integrated Triple-Band Receivers for T-DMB/DAB/FM Digital Radios

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
  • Fixed and Mobile Digital Audio Broadcast (DAB)
  • Terrestrial Digital Multimedia Broadcast (T-DMB)
Part NumberRef. Clock Freq.
IF Output Freq.
Noise Figure
ApplicationsSolutionsBand/ Freq.
(mm x mm)
typSee Notes
MAX217024.5762.0482.92.7 to 3.562DAB
168 to 240
1452 to 1492
6.0 x 6.0TQFN/40$3.48 @1k
MAX2171387 to 108
168 to 240
1452 to 1492
Design kits & evaluation modules
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX2171ETL+Active: Data sheet on request onlyTQFN,;40 pin;37.2 mm?-40°C to +85°CLead Free
MAX2171ETL+TActive: Data sheet on request onlyTQFN,;40 pin;37.2 mm?-40°C to +85°CLead Free
MAX2171ETL/V+No Longer AvailableTQFN,;40 pin;37.2 mm?-40°C to +85°CLead Free
MAX2171ETL/V+TNo Longer AvailableQFN;-40°C to +85°CSee data sheet
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