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ADF7025 Datasheet(PDF) 27 Page - Analog Devices |
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ADF7025 Datasheet(HTML) 27 Page - Analog Devices |
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27 / 44 page  ADF7025 Rev. A | Page 27 of 44 SERIAL INTERFACE The serial interface allows the user to program the eleven 32-bit registers using a 3-wire interface (SCLK, SDATA, and SLE). It consists of a level shifter, a 32-bit shift register, and 11 latches. Signals should be CMOS-compatible. The serial interface is powered by the regulator, and, therefore, is inactive when CE is low. Data is clocked into the register, MSB first, on the rising edge of each clock (SCLK). Data is transferred to one of 11 latches on the rising edge of SLE. The destination latch is determined by the value of the four control bits (C4 to C1). These are the bottom four LSBs, DB3 to DB0, as shown in the timing diagram in Figure 2. Data can also be read back on the SREAD pin. READBACK FORMAT The readback operation is initiated by writing a valid control word to the readback register and setting the readback-enable bit (R7_DB8 = 1). The readback can begin after the control word has been latched with the SLE signal. SLE must be kept high while the data is being read out. Each active edge at the SCLK pin clocks the readback word out successively at the SREAD pin, as shown in Figure 38, starting with the MSB first. The data appearing at the first clock cycle following the latch operation must be ignored. RSSI Readback The RSSI readback operation yields valid results in Rx mode. The format of the readback word is shown in Figure 38. It comprises the RSSI level information (Bit RV1 to Bit RV7), the current filter gain (FG1 and FG2), and the current LNA gain (LG1 and LG2) setting. The filter and LNA gain are coded in accordance with the definitions in Register 9—AGC Register. The input power can be calculated from the RSSI readback value, as outlined in the RSSI/AGC section. Battery Voltage ADCIN/Temperature Sensor Readback The battery voltage is measured at Pin VDD4. The readback information is contained in Bit RV1 to Bit RV7. This also applies for the readback of the voltage at the ADCIN pin and the temperature sensor. From the readback information, the battery or ADCIN voltage can be determined using VBATTERY = (Battery_Voltage_Readback)/21.1 VADCIN = (ADCIN_Voltage_Readback)/42.1 Silicon Revision Readback The silicon revision readback word is valid without setting any other registers, especially directly after power-up. The silicon revision word is coded with four quartets in BCD format. The product code (PC) is coded with two quartets extending from Bit RV9 to Bit RV16. The revision code (RV) is coded with one quartet extending from Bit RV1 to Bit RV8. The product code should read back as PC = 0x25. The current revision code should read as RC = 0x08. Filter Calibration Readback The filter calibration readback word is contained in Bit RV1 to Bit RV8 and is for diagnostic purposes only. Using the automatic filter calibration function, accessible through Register 6, is recommended. Before filter calibration is initiated, Decimal 32 should be read back. READBACK MODE DB15 X X RV16 0 RSSI READBACK BATTERY VOLTAGE/ADCIN/ TEMP. SENSOR READBACK SILICON REVISION FILTER CAL READBACK READBACK VALUE DB14 X X RV15 0 DB13 X X RV14 0 DB12 X X RV13 0 DB11 X X RV12 0 DB10 LG2 X RV11 0 DB9 LG1 X RV10 0 DB8 FG2 X RV9 0 DB7 FG1 X RV8 RV8 DB6 RV7 RV7 RV7 RV7 DB5 RV6 RV6 RV6 RV6 DB4 RV5 RV5 RV5 RV5 DB3 RV4 RV4 RV4 RV4 DB2 RV3 RV3 RV3 RV3 DB1 RV2 RV2 RV2 RV2 DB0 RV1 RV1 RV1 RV1 Figure 38. Readback Value Table |
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