DatasheetWA1470 NB-Fi transceiverBlock Diagram & Chip ArchitectureODE STMref ADCDFT TE TRX IRQVDDIODigital LDOLDODIGPORPOR EXT SPI DCOCVDD LNARX INpLNA LDOLNAADC ClockADC ReferenceGmGenerationBufferRX INnVDD MIXERMIXER LDOVDD BBBaseBand LDO / Receiver DCOCVDD PLLVCO LDOSPISCLK / DFTENRegMapeFuse Control erPLL LDOMISO / DFTOUTDigitalMOSI / DFTINFiltersVDD PAAuto-tuneCSB / DFTRSTBMoDemPA LDOTX LDO PAADC Clock / / / Auto-Calibrate90VDD BiasVCO Auto-tuneBG & Bias Frequency PMU Digital Synthesizer Functions GP LDOLP RC Osc.*LP OSC OutputBPSK Input*HP OSC OutputHP RC Osc.TX OUTpPADCOC / TX OUTnTEMP Sense*CML OUTpCMLDCOCTesting MUX*CML OUTn*TMUX Lines Transmitter Testing Figure 1: WA1470 Functional Block Diagram The WA1470 receiver architecture is direct conversion where the received RF signal is converted directly to baseband. The received RF signal is amplified at the input by a differential low noise amplifier (LNA) followed by a trans-conductance (Gm) stage and quadrature down conversion mixer (I and Q) to baseband signal. The baseband signal is amplified and low pass filtered by 4th order active low pass filter (Rx-BB). The output signal from Rx-BB is digitized by analog to digital converter (ADC) and passed to the baseband modem for further processing. The WA1470 transmitter utilizes direct conversion from baseband digital to analog converter (DAC), followed by an active low pass filter with programmable attenuation to RF frequency and finally output power is generated using an integrated class-E power amplifier (PA). Output power level can be configured from -8 dBm to +15 dBm at antenna with steps of 3 dB as maximum. Input of transmitter DAC is generated by the baseband modem. Rev 5 – June 2020 Page 3 of 24 sales@waviot.com | www.waviot.com Document Outline Key Product Features General Description Applications Block Diagram & Chip Architecture Pin Diagram Pin List & Description Typical Connectivity Chip Modes Specifications ESD Ratings Operating Range Performance Specifications Description of the Registers eFuse Mirror Registers Non-eFuse Writable Registers Read Only Registers Packaging Information Contact Information