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
Applications/Uses
+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)
