MAX2172 direct conversion to low IF tuner for digital audio broadcasting
MAX2172 overview
The MAX2172 direct-conversion to low-IF tuner is 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 MAX2172 achieves a high level of component integraTIon, allowing lowpower, 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 MAX2172 provides a buffered reference clock at 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 MAX2172 is available in a 40-pin thin QFN package (6mm x 6mm) with an exposed pad. Electrical performance is guaranteed over the extended -40 ° C to + 85 ° C temperature range.
Key features of MAX2172
+ 2.7V to + 3.5V Supply Voltage Range Low-IF Output Eliminates IF-Saw Filter Integrated FM / VHF-III Bandpass Filter Integrated Low-IF Bandpass Filter Sigma-Delta Fractional-N Synthesizer + 45dBc ACPR (N ± 1) 2.9dB Typical Noise Figure for VHF-III (Includes On-Chip Tracking Filter) 3.1dB Typical Noise Figure for L-Band VHF-III Sensitivity of -101dBm L-Band Sensitivity of -101dBm Baseband Overload Detector Controls RF AGC Fast Channel Scan RSSI 5- Bit Output FM (S + N) / N = 26dB at -111dBm Small 6mm x 6mm Thin QFN PackageMAX2172 functional block diagram
MAX2172 Application / Use
Fixed, mobile digital audio broadcasting (DAB, DAB +) equipment with FM function Terrestrial digital multimedia broadcasting (T-DMB) equipment with FM function
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