General Description

The MAX2651/MAX2652/MAX2653 silicon germanium (SiGe), low-noise amplifiers (LNAs) are intended for use in GSM900, DCS1800, and PCS1900 band wireless handsets. The MAX2651/MAX2652 consist of two LNAs, one optimized for the GSM900 band and the other optimized for the DCS1800/PCS1900 bands. They feature a band-select pin to switch between the two LNAs, as well as a gain-step input to reduce the gain of each LNA by 20dB and reduce supply current. The MAX2652 is functionally equivalent to the MAX2651, but features a low power shutdown mode. The MAX2653 consists of a single LNA optimized for the DCS1800 and PCS1900 bands, and has a shutdown feature and a 20dB gain step.

特性 Features

? Wide Operating Frequency Range

800MHz to 1000MHz (MAX2651/52)

1800MHz to 2000MHz (MAX2651/52/53)

? Excellent Low-Noise Performance

1.2dB/1.3dB over GSM Receive Band (MAX2651/52)

1.8dB/1.8dB/1.7dB over DCS Receive Band (MAX2651/52/53)

? High Gain

18dB over GSM Receive Band (MAX2651/52)

18dB/17.5dB/18.5dB over DCS Receive Band (MAX2651/52/53)

? 20dB Gain Reduction in Low-Gain Mode

? Externally Adjustable Gain

? +2.7V to +3.3V Single-Supply Operation

? Low Supply Current

5.4mA to 7.0mA in High-Gain Mode

2.2mA in Low-Gain Mode

? 0.25μA Shutdown Current (MAX2652/53)

Applications

GSM900/DCS1800 Dual-Band Phones

GSM900/DCS1800/PCS1900 Triple-Band Phones

DCS1800 or PCS1900 Single-Mode Phones

IS-136 TDMA Dual-Band Phones