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AD9518-3ABCPZ Datasheet(PDF) 5 Page - Analog Devices |
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AD9518-3ABCPZ Datasheet(HTML) 5 Page - Analog Devices |
5 / 64 page Data Sheet AD9518-3 Rev. B | Page 5 of 64 Parameter Min Typ Max Unit Test Conditions/Comments CHARGE PUMP (CP) CPV is CP pin voltage; VCP is charge pump power supply voltage ICP Sink/Source Programmable High Value 4.8 mA With CPRSET = 5.1 kΩ Low Value 0.60 mA Absolute Accuracy 2.5 % CPV = VCP/2 V CPRSET Range 2.7/10 kΩ ICP High Impedance Mode Leakage 1 nA Sink-and-Source Current Matching 2 % 0.5 < CPV < VCP − 0.5 V ICP vs. CPV 1.5 % 0.5 < CPV < VCP − 0.5 V ICP vs. Temperature 2 % CPV = VCP/2 V PRESCALER (PART OF N DIVIDER) See the VCXO/VCO Feedback Divider N—P, A, B, R section Prescaler Input Frequency P = 1 FD 300 MHz P = 2 FD 600 MHz P = 3 FD 900 MHz P = 2 DM (2/3) 200 MHz P = 4 DM (4/5) 1000 MHz P = 8 DM (8/9) 2400 MHz P = 16 DM (16/17) 3000 MHz P = 32 DM (32/33) 3000 MHz Prescaler Output Frequency 300 MHz A, B counter input frequency (prescaler input frequency divided by P) PLL DIVIDER DELAYS Register 0x019: R, Bits[5:3]; N, Bits[2:0] (see Table 44) 000 Off ps 001 330 ps 010 440 ps 011 550 ps 100 660 ps 101 770 ps 110 880 ps 111 990 ps NOISE CHARACTERISTICS In-Band Phase Noise of the Charge Pump/Phase Frequency Detector (In-Band Is Within the LBW of the PLL) The PLL in-band phase noise floor is estimated by measuring the in-band phase noise at the output of the VCO and subtracting 20 log(N) (where N is the value of the N divider) At 500 kHz PFD Frequency −165 dBc/Hz At 1 MHz PFD Frequency −162 dBc/Hz At 10 MHz PFD Frequency −151 dBc/Hz At 50 MHz PFD Frequency −143 dBc/Hz PLL Figure of Merit (FOM) −220 dBc/Hz Reference slew rate > 0.25 V/ns; FOM + 10 log(fPFD) is an approximation of the PFD/CP in-band phase noise (in the flat region) inside the PLL loop bandwidth; when running closed- loop, the phase noise, as observed at the VCO output, is increased by 20 log(N) PLL DIGITAL LOCK DETECT WINDOW2 Signal available at LD, STATUS, and REFMON pins when selected by appropriate register settings Required to Lock (Coincidence of Edges) Selected by Register 0x017[1:0] and Register 0x018[4] Low Range (ABP 1.3 ns, 2.9 ns) 3.5 ns Register 0x017[1:0] = 00b, 01b,11b; Register 0x018[4] = 1b High Range (ABP 1.3 ns, 2.9 ns) 7.5 ns Register 0x017[1:0] = 00b, 01b, 11b; Register 0x018[4] = 0b High Range (ABP 6.0 ns) 3.5 ns Register 0x017[1:0] = 10b; Register 0x018[4] = 0b To Unlock After Lock (Hysteresis)2 Low Range (ABP 1.3 ns, 2.9 ns) 7 ns Register 0x017[1:0] = 00b, 01b, 11b; Register 0x018[4] = 1b High Range (ABP 1.3 ns, 2.9 ns) 15 ns Register 0x017[1:0] = 00b, 01b, 11b; Register 0x018[4] = 0b High Range (ABP 6.0 ns) 11 ns Register 0x017[1:0] = 10b; Register 0x018[4] = 0b 1 REFIN and REFIN self-bias points are offset slightly to avoid chatter on an open input condition. 2 For reliable operation of the digital lock detect, the period of the PFD frequency must be greater than the unlock-after-lock time. |
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