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ADF4001BCPZ-RL Datenblatt(PDF) 4 Page - Analog Devices |
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ADF4001BCPZ-RL Datenblatt(HTML) 4 Page - Analog Devices |
4 / 17 page ADF4001 Rev. B | Page 4 PIN CONFIGURATIONS TSSOP LFCSP Table 1. Pin Function Descriptions TSSOP Pin No. LFCSP Pin No. Mnemonic Description 1 19 RSET Connecting a resistor between this pin and CPGND sets the maximum charge pump output current. The nominal voltage potential at the RSET pin is 0.66 V. The relationship between ICP and RSET is SET MAX CP R I 5 . 23 So, with RSET = 4.7 kΩ, ICP MAX = 5 mA. 2 20 CP Charge Pump Output. When enabled, this provides ±ICP to the external loop filter which, in turn, drives the external VCO or VCXO. 3 1 CPGND Charge Pump Ground. This is the ground return path for the charge pump. 4 2, 3 AGND Analog Ground. This is the ground return path of the prescaler. 5 4 RFINB Complementary Input to the N counter. This point must be decoupled to the ground plane with a small bypass capacitor, typically 100 pF. See Figure 3. 6 5 RFINA Input to the N counter. This small signal input is ac-coupled to the external VCO or VCXO. 7 6, 7 AVDD Analog Power Supply. This ranges from 2.7 V to 5.5 V. Decoupling capacitors to the analog ground plane should be placed as close as possible to this pin. AVDD must have the same value as DVDD. 8 8 REFIN Reference Input. This is a CMOS input with a nominal threshold of VDD/2 and a dc equivalent input resistance of 100 kΩ. See Figure 2. This input can be driven from a TTL or CMOS crystal oscillator or can be ac-coupled. 9 9, 10 DGND Digital Ground. 10 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 will power up the device, depending on the status of the power-down bit F2. 11 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 input is a high impedance CMOS input. 12 13 DATA Serial Data Input. The serial data is loaded MSB first with the two LSBs being the control bits. This input is a high impedance CMOS input. 13 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, the latch being selected by using the control bits. 14 15 MUXOUT This multiplexer output allows either the lock detect, the scaled RF, or the scaled reference frequency to be accessed externally. 15 16, 17 DVDD Digital Power Supply. This ranges from 2.7 V to 5.5 V. Decoupling capacitors to the digital ground plane should be placed as close as possible to this pin. DVDD must be the same value as AVDD. 16 18 VP Charge Pump Power Supply. This should be greater than or equal to VDD. In systems where VDD is 3 V, it can be set to 5 V and used to drive a VCO or VCXO with a tuning range of up to 5 V. N/A EP EPAD Exposed Pad. The exposed pad should be connected to AGND. RSET CP CPGND AGND RFINB RFINA AVDD REFIN LE MUXOUT DVDD VP CE CLK DATA DGND NOTES 1. TRANSISTOR COUNT 6425 (CMOS) AND 50 (BIPOLAR). TOP VIEW (Not to Scale) 1 2 3 4 5 6 7 8 ADF4001 16 15 14 13 12 11 10 9 AGND MUXOUT LE DATA CLK CE CPGND AGND RFINB RFINA NOTES 1. TRANSISTOR COUNT 6425 (CMOS) AND 50 (BIPOLAR). 2. CONNECT EXPOSED PAD TO AGND. 14 13 12 1 3 4 15 11 2 5 ADF4001 TOP VIEW (Not to Scale) |
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