Single-chip 802.11a/g, RF transceivers.
Maxim's MAX2825/MAX2826/MAX2827 family of single-chip RF transceivers for 802.11a/g, 54Mb/s, OFDM radio applications are said to improve receiver sensitivity performance by 5 dB in 11g 54Mb/s mode when compared to existing CMOS-based designs. This results in a 78 percent longer range for line-of-sight WLAN applications and 46 percent longer range for indoor applications, according to the company. The MAX2825 is designed for single-band 2.4 GHz 802.11g; the MAX2826 is designed for single-band 5GHz 802.11a and the MAX2827 for dual-band 802.11a/g applications. The MAX2825/MAX2826/MAX2827 offer a low 3.5 dB receiver noise figure, a low -99 dBc/Hz at 100 kHz oscillator phase noise, <40 ns group-delay variation in the channel-filter passband, and high 40 dBc I/Q quadrature sideband suppression. Fast digital AGC and DC offset-cancellation schemes allow antenna diversity selection within a packet header. These devices are designed with -8 dBm receiver input IP3 and 80 dB filter-channel selectivity, making them immune to 802.11a/g OFDM and 802.11b CCK jammers. On the transmitter side, the Tx output is highly linear, delivering up to -2.5 dBm for 802.11g and -5.5 dBm for 802.11a, with -36 dBc EVM and -60 dB ACPR. This allows the external power amp (PA) to deliver its maximum power without added distortion from the transceiver, thus directly improving transmitter range performance. The long-range and interference-immunity characteristics make the transceivers suitable for both client and access-point radio designs for multiuser, Wi-Fi hotspot applications. Maxim Integrated Products
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