Abstract:
The MAX2338 receiver RF front-end IC is designed for dual-band CDMA cellular phones and can also be used in dual-band TDMA, GSM, or EDGE cellular phones. Thanks to the it’s on-chip low-power LO divider, the cellular VCO module can be eliminated. The MAX2338 includes a low-noise amplifier (LNA) with an adjustable high-input third-order intercept point (IIP3) to minimize intermediation and cross-modulation in the presence of large interfering signals. For cellular band operation, a low-gain LNA is available for higher cascaded IIP3 at lower current. The CDMA mixers are designed for high linearity, low noise, and differential IF outputs. The MAX2338 triple-mode LNA/mixer includes an on- chip LO frequency divider to allow the use of a single VCO for both bands. In addition, 183. 6MHz CDMA circuit optimized the MAX2338 mixer and the matching circuit of IF SAW filter in the Application information.