DC2391A

DC2391A demonstration circuit 2391A is optimized for evaluation of the LTC®5589 low power I/Q modulator up to 4.5GHz. For frequencies above 4.5GHz, LO matching circuit on the DC2391A demo board can be easily modified for improved image rejection performance. The four balanced I- and Q-baseband input ports can be either AC-coupled with internal bias supplied, or DC-coupled from a source with a common-mode voltage level of about +1.4V. The SPI interface is used to set internal registers which control the gain, optimum centre frequency, I-offset, Q-offset and sideband suppression. In addition to the digital gain control with 1dB steps, there is an analogue gain control, VCTRL. An on-chip thermometer can be used to compensate for the gain vs temperature variations using a digital gain control change. The update can either be automatically triggered, or entirely switched off.

• 3.8V supply voltage
• Operating temperature range from -40°C to 105°C

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