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MAS6179A1TC00 Datasheet(PDF) 4 Page - Micro Analog systems |
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MAS6179A1TC00 Datasheet(HTML) 4 Page - Micro Analog systems |
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4 / 10 page  4 (10) DA6179.000 22 January, 2007 FREQUENCY SELECTION The frequency selection and power down control is accomplished via two digital control pins PDN1 and PDN2. The control logic is presented in table 1. Table 1. Frequency selection and power down control PDN1 PDN2 RFI2 Switch RFI3 Switch Selected Crystal Output Description High High Open Open - Power down High Low Open Open QO1 Frequency 1 Low High Closed Open QO2 Frequency 2, RFI2 capacitor connected in parallel with antenna Low Low Closed Closed QO3 Frequency 3, RFI2 and RFI3 capacitors connected in parallel with antenna The internal antenna tuning capacitor switches (RFI2, RFI3) and crystal filter output switches (QO1, QO2, QO3) are controlled according table 1. If frequency 1 is selected the RFI2 and RFI3 switches are open and only crystal output QO1 is active. Antenna frequency is determined by antenna inductor LANT (see Typical Application on page 6), antenna capacitor CANT1 and parasitic capacitances related to antenna inputs RFIP, RFIM, RFI2 and RFI3 (see Antenna Tuning Considerations below). Frequency 1 is the highest frequency of the three selected frequencies. If frequency 2 is selected then RFI2 switch is closed to connect CANT2 to pin RFIM in parallel with ferrite antenna and tune it to frequency 2. Then only crystal output QO2 is active. Frequency 2 is the medium frequency of the three selected frequencies. If frequency 3 is selected both RFI2 and RFI3 switches are closed to connect both CANT2 and CANT3 capacitors to RFIM pin in parallel with ferrite antenna and tune it to frequency 3. Then only crystal output QO3 is active. Frequency 3 is the lowest frequency of the three selected frequencies. It is recommended to switch the device to power down for at least 50ms before switching to another frequency. This guarantees fast startup in switching to another frequency. During minimum 50ms power down time the AGC capacitor voltage is completely pulled to VDD and the proper fast startup conditions are met. Without proper fast startup control the startup time can be several minutes. With fast startup it is shortened typically to few seconds. |
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