New from Semtech is the SX1233, a programmable ISM-band transceiver that combines a bit rate of 600 Kbps with a link budget of 137 dB. It offers high receive (Rx) sensitivity to enhance reception of weaker signals, as well as a high transmitter (Tx) output power programmable in 1 dB steps. Strong blocking immunity of 80 dB and high linearity give the transceiver front-end protection from both in-band and out-of-band interference (including cellular and devices sharing the 2,4 GHz band), enabling the device to meet stringent Rx robustness requirements. The zero-IF architecture of the SX1233 uses a smart AFC (automatic frequency control) engine to ensure optimum performance for low modulation index signals without susceptibility to undesirable image and half-IF spurious products. TrueRF technology eliminates the need for a SAW filter, enabling a low-cost external component count while still satisfying ETSI and FCC regulations. The SX1233 also integrates the VCO tank, PLL loop filter and an RF switch.
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