MCP2030三通道的模拟前端设备

　　The MCP2030 is a stand-alone Analog Front-End （AFE） device for Low-Frequency （LF） sensing and bidirectional communication applications. The device has eight internal Configuration registers which are readable and programmable， except the read-only STATUS register， by an external device. The device has three low-frequency input channels. Each input channel can be individually enabled or disabled. The device can detect an input signal with amplitude as low as ~1 mVPP and can demodulate an amplitude-modulated input signal with as low as 8% modulation depth. The device can also transmit data by clamping and unclamping the input LC antenna voltage. The device can output demodulated data， carrier clock or RSSI current depending on the register setting. The demodulated data and carrier clock outputs are available on the LFDATA pin， while the RSSI output is available on the RSSI pin. The RSSI current output is linearly proportional to the input signal strength. The device has programmable internal tuning capacitors for each input channel. The user can program these capacitors up to 63 pF， 1 pF per step. These internal tuning capacitors can be used effectively for fine-tuning of the external LC resonant circuit. The device is optimized for very low current consumption and has various battery-saving low-power modes （Sleep， Standby， Active）。 The device can also be operated in Battery Back-up and Batteryless modes using a few external components. This device is available in 14-pin PDIP， SOIC， and TSSOP packages. This device is also used as the AFE in the PIC16F639.