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AK2401 Folha de dados(PDF) 97 Page - Asahi Kasei Microsystems |
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AK2401 Folha de dados(HTML) 97 Page - Asahi Kasei Microsystems |
97 / 103 page [AK2401] 017003093-E-00 2017/3 97 16.4. PCB Design Below are board design guidelines confirmed by the conditions of our evaluation board and do not specify layout pattern of customer's board or guarantee the characteristics. - Connect the exposed pad in the center of the back to the low impedance analog ground. If the exposed pad is not mounted, the operation may become unstable. - The ADC is a 24-bit delta-sigma A/D converter. ADC operation clock is generated by dividing a reference clock that is input to the TCXOIN pin by four. For this reason, since (TCXO/4) MHz and its harmonic components leak to the input part of the LNA, selecting that frequency as the RF frequency causes suppression of receiver sensitivity. Therefore, if customer ’s RF frequency is equal to multiplied by (TCXO/4) MHz, evaluate its performance with customer ’s board. On our evaluation board we confirm that the suppression of receiver sensitivity will be relaxed by paying attention to the guidelines described below. - Each VSS is not separated and connected to the same analog ground. - Spurious characteristics are improved by short-circuiting the exposed pad and each VSS pin with the TOP layer of the PCB. - Power supply pins need to be careful not to go around LNA because ADVDD/DVDD is the main spurious source. In addition to connecting a 100pF decoupling capacitor to each power supply pin, 10nF is added to LNAVDD and 1uF is added to ADVDD. - Each power supply pin is wired in low impedance from LDO etc. without connecting ferrite beads in series. Improvement of spurious characteristics is confirmed by connectin g 1Ω in series only for LNAVDD. - Spurious characteristics degrade due to high frequency noise of AD_SCLK, AD_SDO, AD_FS pins. Put 1 00Ω damping resistance in series. Fill the digital signal line in the inner layer. - Connect decoupling capacitors, especially small capacitance ceramic capacitors as closely as possible to AK2401. - Use a balun connected to RFOUT_P, RFOUT_N pins depending on the frequency band. Because it is an open collector pin, when using a balun without a center tap, it is necessary to supply the power supply voltage separately through an inductor. - For VREF1, VREF2 pins capacitor connected to ground, stabilize the internal circuit, connect the specified value. - All digital input pins must not be allowed to float. |
Nº de peça semelhante - AK2401 |
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Descrição semelhante - AK2401 |
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