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ADF41020BCPZ-RL7 Scheda tecnica(PDF) 6 Page - Analog Devices |
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ADF41020BCPZ-RL7 Scheda tecnica(HTML) 6 Page - Analog Devices |
6 / 16 page ADF41020 Data Sheet Rev. 0 | Page 6 of 16 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Figure 3. Pin Configuration Table 4. Pin Function Descriptions Pin No. Mnemonic Description 1, 2, 3, 5, 9, 10 GND Ground Pins. 4 RF IN Input to the RF Prescaler. This input is ac-coupled internally. 6, 7 AV DD Analog Power Supply. This may range from 2.85 V to 3.15 V. Decoupling capacitors to the ground plane should be placed as close as possible to this pin. Pin 6 is the supply for the fixed divide-by-4 prescaler. 8 REF IN Reference Input. This is a CMOS input with a nominal threshold of DV DD/2 and a dc equivalent input resistance of 100 kΩ (see Figure 9). This input can be driven from a TTL or CMOS crystal oscillator or it can be ac-coupled. 11 CE Chip Enable. A logic low on this pin powers down the device and puts the charge pump output into three- state mode. Taking the pin high powers up the device, depending on the status of the power-down bit, PD1. 12 CLK Serial Clock Input. This serial clock is used to clock in the serial data to the registers. The data is latched into the 24-bit shift register on the CLK rising edge. This is a high impedance CMOS input. 13 DATA Serial Data Input. The serial data is loaded MSB first with the two LSBs being the control bits. This is a high impedance CMOS input. 14 LE Load Enable, CMOS Input. When LE goes high, the data stored in the shift registers is loaded into one of the four latches with the latch being selected using the control bits. 15 MUXOUT This multiplexer output allows either the lock detect, the scaled RF, or the scaled reference frequency to be accessed externally. 16, 17 DV DD Digital Power Supply. This may range from 2.85 V to 3.15 V. Decoupling capacitors to the ground plane should be placed as close as possible to this pin. DV DD must be the same value as AVDD. 18 V P Charge Pump Power Supply. 19 R SET Connecting a resistor between this pin and GND sets the maximum charge pump output current. The nominal voltage potential at the R SET pin is 0.66 V. The relationship between ICP and RSET is SET MAX CP R I 5 . 25 = So, with R SET = 5.1 kΩ, ICP MAX = 5.0 mA. 20 CP Charge Pump Output. When enabled, this provides ±I CP to the external loop filter, which in turn drives the external VCO. EP Exposed Pad. The exposed pad must be connected to GND. 14 13 12 1 3 4 LE 15 MUXOUT DATA CLK 11 CE GND GND 2 GND RFIN 5 GND TOP VIEW NOTES 1. THE EXPOSED PAD MUST BE CONNECTED TO GND. ADF41020 |
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