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General Description

The MAX2411A performs the RF front-end transmit/receive function in time-division-duplex (TDD) communication systems. It operates over a wide frequency range and is optimized for RF frequencies around 1.9GHz. Applications include most popular cordless and PCS standards. The MAX2411A includes a low-noise amplifier (LNA), a downconverter mixer, a local-oscillator buffer, an upconverter mixer, and a variable-gain power-amplifier (PA) driver in a low-cost, plastic surface-mount package. The MAX2411A’s unique bidirectional, differential IF port reduces cost and component count by allowing the transmit and receive paths to share the same IF filter.

The LNA has a 2.4dB typical noise figure and a -10dBm input third-order intercept point (IP3). The downconvert er mixer has a low 9.2dB noise figure and 4dBm input IP3. Image and local-oscillator filtering are implemented off-chip for maximum flexibility. The PA driver amplifier has 15dB of gain, which can be reduced over a 35dB range. Power consumption is only 60mW in receive mode and 90mW in transmit mode and drops to less than 3μW in shutdown mode.

For applications requiring separate, single-ended IF input and output ports, refer to the MAX2410 data sheet. For applications requiring only a receive function, Maxim offers a low-cost downconverter with LNA (see the MAX2406 data sheet).

Features

? Low-Cost Silicon Bipolar Design

? Integrated Upconvert/Downconvert Function

? Operates from a Single +2.7V to +5.5V Supply

? 3.2dB Combined Receiver Noise Figure:

2.4dB (LNA)

9.2dB (mixer)

? Flexible Power-Amplifier Driver:

18dBm Output Third-Order Intercept (OIP3)

35dB Gain-Control Range

? LO Buffer for Low LO Drive Level

? Low Power Consumption:

60mW Receive

90mW Full-Power Transmit

? 0.3μW Shutdown Mode

? Flexible Power-Down Modes Compatible with MAX2510/MAX2511 IF Transceivers

Applications

PWT1900

DECT

DCS1800/PCS1900

ISM-Band Transceivers

PHS/PACS

Iridium Handsets