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ADF7011BRU 数据表(PDF) 5 Page - Analog Devices |
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ADF7011BRU 数据表(HTML) 5 Page - Analog Devices |
5 / 24 page REV. 0 ADF7011 –5– PIN CONFIGURATION TOP VIEW (Not to Scale) 24 23 22 21 20 19 18 17 16 15 14 13 1 2 3 4 5 6 7 8 9 10 11 12 TSSOP ADF7011 DGND MUXOUT TxCLK TxDATA LE RSET CPVDD CPGND CPOUT CLK CE CLKOUT OSC2 OSC1 VCOGND TEST CREG CVCO VCOIN AGND DVDD RFGND RFOUT DATA PIN FUNCTION DESCRIPTIONS Pin No. Mnemonic Function 1RSET External Resistor to Set Change Pump Current and Some Internal Bias Currents. Use 4.7 k Ω as default: I R CP MAX SET = 95 . So, with RSET = 4.7 k Ω, ICP MAX = 2.02 mA. 2 CPVDD Charge Pump Supply. This should be biased at the same level as RFOUT and DVDD. The pin should be decoupled with a 0.1 µF capacitor as close to the pin as possible. 3CPGND Charge Pump Ground. 4CPOUT Charge Pump Output. This output generates current pulses that are integrated in the loop filter. The integrated current changes the control voltage on the input to the VCO. 5CEChip Enable. A logic low applied to this pin powers down the part. This must be high for the part to function. This is the only way to power down the regulator circuit. 6 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. 7 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. 8LELoad 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 using the control bits. 9 TxDATA Digital data to be transmitted is input on this pin. 10 TxCLK GFSK Only. This clock output is used to synchronize microcontroller data to the TxDATA pin of the ADF7011. The clock is provided at the same frequency as the data rate. 11 MUXOUT This multiplexer output allows either the digital lock detect (most common), the scaled RF, or the scaled reference frequency to be accessed externally. Used commonly for system debug. See the Function Regis- ter Map. 12 DGND Ground Pin for the RF Digital Circuitry. 13 CLKOUT The Divided Down Crystal Reference with 50:50 Mark-Space Ratio. May be used to drive the clock input of a microcontroller. To reduce spurious components in the output spectrum, the sharp edges can be reduced with a series RC. For 4.8 MHz output clock, a series 50 Ω into 10 pF will reduce spurs to < –50 dBc. Defaults on power-up to divide by 16. 14 OSC2 Oscillator Pin. If a single-ended reference (such as a TCXO) is used, it should be applied to this pin. When using an external signal generator, a 51 Ω resistor should be tied from this pin to ground. The XOE bit in the R register should set high when using an external reference. |
类似零件编号 - ADF7011BRU |
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类似说明 - ADF7011BRU |
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