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ADF9010 Datasheet(PDF) 24 Page - Analog Devices |
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ADF9010 Datasheet(HTML) 24 Page - Analog Devices |
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24 / 29 page  ADF9010 Rev. 0 | Page 23 of 28 APPLICATIONS INFORMATION AGND DGND 24-BIT INPUT SHIFT REGISTER PHASE FREQUENCY DETECTOR PRESCALER P/P + 1 N COUNTER N = BP + A PLL DC OFFSET CORRECTION DC OFFSET CORRECTION TxOUTP TxOUTN TxBBIP TxBBIN TxBBQP TxBBQN CP REFIN SCLK SDATA SLE AVDD DVDD VP MUXOUT R COUNTER B COUNTER A COUNTER VCM RSET RxINIP RxININ RxBBIP RxBBIN RxBBQP RxBBQN RxINQP RxINQN OVF CEXT1 CEXT2 CEXT3 CEXT4 CT CE LOOUTP LOOUTN CHARGE PUMP VCM VTUNE PA MODULE MxFE SHA SHA ADC AGC DIGITAL CONTROL DAC DAC 24-BIT INPUT SHIFT REGISTER CLK DATA LE EN Rx BASEBAND Tx BASEBAND BALUN BALUN AUX DAC AUX DAC AUX DAC ADF9010 RXVDD Figure 27. Applications Diagram The diagram in Figure 27 shows the ADF9010 in an RFID appli- cation. The demodulator is driven by the LOOUTx pins of the ADF9010. This demodulator produces quadrature baseband signals that are gained up in the ADF9010 Rx filters. These filtered analog baseband signals are then digitized by the ADC on a mixed signal front-end (MxFE) part. The digital signals are then processed by DSP. On the transmit side, the MxFE generates quadrature analog baseband signals, which are upconverted to RF using the inte- grated PLL and VCO. The modulated RF signals are combined using a balun and gained up to 30 dBm by a power amplifier. DEMODULATOR CONNECTION To receive the back-scattered signals from an RFID tag, the ADF9010 needs to be used with a high dynamic range demodulator, such as the ADL5382 that is suitable for RFID applications. Some extra filtration is provided by the optional shunt capacitors and series inductors. Due to the large self- blocker, a 100 nF capacitor removes the dc generated by the self-blocker inherent to RFID systems. This system is used on the EVAL-ADF9010EBZ1 evaluation board. DEMOD ADL5382 IHI ILO ADF9010 R xINIP R xININ 0Ω 0Ω 100nF 100nF 47pF 1.2nF Figure 28. ADL5382 to ADF9010 Rx Interface |
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