Low-Cost Downconverter with Low-Noise Amplifier

The MAX2406 low-noise amplifier (LNA)/downconverter mixer is designed for use over a wide range of frequencies and is optimized for communications systems operating at a frequency of 1.9GHz. Applications include PWT1900/DCT1900, DCS1800/PCS1900, PHS, and DECT. This device includes an LNA, a downconverter mixer, and a local-oscillator (LO) buffer in a low-cost, plastic surface-mount package. At 1.9GHz, the LNA has 2.5dB typical noise figure and a -9.5dBm input third-order intercept point (IP3). The downconverter mixer has a low 9.1dB noise figure and a 4.5dBm input IP3. Image and LO filtering are implemented off-chip for maximum flexibility.

The MAX2406 has a differential IF port that can be used in a single-ended configuration by tying the unused side to VCC. The LO buffer can be driven differentially or in a single-ended configuration with only -10dBm of LO power. Power consumption is 60mW in receive mode, and typically drops to less than 1µW in shutdown mode.

For transceiver applications, the MAX2410 or MAX2411A both offer a transmitter along with a similar receiver.

Applications

* DCS1800 or PCS1900 Single-Mode Phones * DECT * PHS/PACS * PWT1900/DCT1900

* Integrated LNA/Downconverter

* 3.2dB Combined Receiver Noise Figure:

* 2.5dB (LNA)

* 9.1dB (mixer)

* -12.5dBm Combined Receiver Input IP3:

* -9.5dBm (LNA)

* 4.5dBm(mixer)

* LO Buffer

* +2.7V to +5.5V Single-Supply Operation

* 60mW Power Consumption

* Low-Power Shutdown Mode