RF to Bits Tuner for Digital Audio Broadcast

RF to Bits DAB/FM Front-End Helps Reduce the DSP MIPS with Internal Digital Filtering

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The MAX2173 is a highly integrated direct-conversion tuner for digital audio broadcast (DAB) and terrestrial digital multimedia broadcast (T-DMB) applications in the 168MHz to 240MHz (VHF band-III) and 1452MHz to 1492MHz (L-band) frequency bands. For FM and DRM+ reception, a low-IF conversion is used, covering a frequency range of 76MHz to 108MHz (FM band). The design integrates lowpass filters, enabling low-power tuner-on-board designs. The mixer and lowpass filtering are followed by a dual ADC and digital filtering. The digital filtering reduces the output data rate and eases the processing load on the DSP. The resulting bit stream is driven off-chip via an I²S format bus.

An integrated digitally controlled crystal oscillator provides more than ±50ppm control range, eliminating the need for a VCXO. The MAX2173 also provides a buffered-reference clock output at the crystal frequency (fREF) or fREF/3.

Two LDOs are integrated into the MAX2173. The 1.6V LDO can be used to power the internal 1.6V circuitry. External circuits can be powered using the 1.2V LDO, eliminating the need for a stand-alone 1.2V regulator.

The MAX2173 is available in a 40-pin TQFN package (6mm x 6mm) with an exposed pad. Electrical performance is guaranteed over the extended -40°C to +85°C temperature range.

Key Features

  • RF to Bits® Solution with I²S Format Output
  • Integrated DCXO Provides ±50ppm Control
  • Integrated Digital Filtering
  • RSSI Output Through I²C or I²S
  • Integrated FM/VHF Band-III RF Bandpass Filter
  • Fully Integrated AGC Control Loops
  • Integrated 1.2V and 1.6V LDOs
  • Small Package (6mm x 6mm TQFN)


  • Automotive DAB Products
  • Fixed and Mobile DAB/FM Products
  • T-DMB/FM Products

See parametric specs for Radio Receivers (6)

Part NumberRef. Clock Freq.
Noise Figure
ApplicationsSolutionsBand/ Freq.
(mm x mm)
typSee Notes
MAX2173 24.5762.73.1 to 3.5135
76 to 90
87 to 108
168 to 240
1452 to 1492
6.0 x 6.0
$6.59 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
Request Reliability Report for: MAX2173 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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