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ADF4360-8BCP bảng dữ liệu(PDF) 11 Page - Analog Devices |
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ADF4360-8BCP bảng dữ liệu(HTML) 11 Page - Analog Devices |
11 / 24 page ADF4360-8 Rev. A | Page 11 of 24 Lock Detect MUXOUT can be programmed for one type of lock detect. Digital lock detect is active high. When LDP in the R counter latch is set to 0, digital lock detect is set high when the phase error on three consecutive phase detector cycles is less than 15 ns. With LDP set to 1, five consecutive cycles of less than 15 ns phase error are required to set the lock detect. It stays set high until a phase error of greater than 25 ns is detected on any subsequent PD cycle. INPUT SHIFT REGISTER The ADF4360 family’s digital section includes a 24-bit input shift register, a 14-bit R counter, and an 18-bit N counter comprised of a 5-bit A counter and a 13-bit B counter. Data is clocked into the 24-bit shift register on each rising edge of CLK. The data is clocked in MSB first. Data is transferred from the shift register to one of four latches on the rising edge of LE. The destination latch is determined by the state of the two control bits (C2, C1) in the shift register. The two LSBs, DB1 and DB0, are shown in Figure 2. The truth table for these bits is shown in Table 5. Table 6 shows a summary of how the latches are programmed. Note that the test modes latch is used for factory testing and should not be programmed by the user. Table 5. C2 and C1 Truth Table Control Bits C2 C1 Data Latch 0 0 Control Latch 0 1 R Counter 1 0 N Counter (B) 1 1 Test Modes Latch VCO The VCO core in the ADF4360 family uses eight overlapping bands, as shown in Figure 19, to allow a wide frequency range to be covered without a large VCO sensitivity (KV) and resultant poor phase noise and spurious performance. The correct band is chosen automatically by the band select logic at power-up or whenever the N counter latch is updated. It is important that the correct write sequence be followed at power-up. This sequence is 1. R counter latch 2. Control latch 3. N counter latch During band select, which takes five PFD cycles, the VCO VTUNE is disconnected from the output of the loop filter and connected to an internal reference voltage. 0 1.0 0.5 2.5 2.0 1.5 3.5 3.0 80 85 90 100 95 105 115 110 FREQUENCY (MHz) Figure 19. Frequency vs. VTUNE, ADF4360-8, L1 and L2 = 270 nH The R counter output is used as the clock for the band select logic and should not exceed 1 MHz. A programmable divider is provided at the R counter input to allow division by 1, 2, 4, or 8, and is controlled by the BSC1 bit and the BSC2 bit in the R counter latch. Where the required PFD frequency exceeds 1 MHz, the divide ratio should be set to allow enough time for correct band selection. After band selection, normal PLL action resumes. The value of KV is determined by the value of inductors used (see the Choosing the Correct Inductance Value section). The ADF4360 family contains linearization circuitry to minimize any variation of the product of ICP and KV. The operating current in the VCO core is programmable in four steps: 2.5 mA, 5 mA, 7.5 mA, and 10 mA. This is controlled by the PC1 bit and the PC2 bit in the control latch. |
Số phần tương tự - ADF4360-8BCP |
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Mô tả tương tự - ADF4360-8BCP |
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