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Maxim > Design Support > Technical Documents > Application Notes > Wireless and RF > APP 1835
Keywords: rf, rfic, wireless, modulator, lo, iq, rfics, radio frequency, rf ics, i/q modulator
APPLICATION NOTE 1835
REP039: The MAX2510 IF Transceiver with the
MAX5183 DAC
Dec 31, 2002
Abstract: RF systems, which require direct coupling between the baseband output digital-to-analog
converter (DAC) and the input to the I/Q modulator, present a design challenge. This unique requirement
of direct coupling does not exist in many RF systems because the modulation and encoding are
contrived to avoid the need for DC response at this point in the system. When the need for very low
frequency response exists, a way must be found to route the DAC output signal into the I/Q modulator
while providing acceptable RF performance. This application note describes tests carried out on the
MAX2510 IF transceiver to measure the impact of DC coupling into the modulator, presents the test
results, and proposes a simple circuit to provide the DC interface to the MAX5183 DAC.
Rapid engineering prototypes are real circuits that Maxim application engineers have built and
measured in our labs. They can provide a starting point for new RF designs. They are not
available as evaluation kits.
Additional Information:
Wireless Product Line Page
Quick View Data Sheet for the MAX2510
Quick View Data Sheet for the MAX5180/MAX5183
Applications Technical Support
The MAX2510 is a highly integrated IF transceiver featuring four operating modes for advanced system
power management. Typically, the receiver downconverts a high IF/RF (up to 600MHz) to a low IF (up to
30MHz) using a double-balance mixer. Also included in the receiver function are an IF buffer that can
drive an off-chip filter, an on-chip limiting amplifier offering 90dB of receive-signal-strength indication
(RSSI), and a robust differential limiter output driver designed to directly drive a CMOS input. The
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