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AK2400 Fiches technique(PDF) 39 Page - Asahi Kasei Microsystems |
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AK2400 Fiches technique(HTML) 39 Page - Asahi Kasei Microsystems |
39 / 52 page [AK2400] 014008989-E-01 39 2015/4 Typical Evaluation Board Schematic (PLL SYNTH) C2 AK2400 Loop Filter C1 C3 R2 R2' R3 CP CPZ SWIN RFOUT 51 Ω 100pF RFINN VCO BIAS3 333 RFINP 100pF 27k Ω REFIN VREF1 220nF 100pF 18 Ω 18 Ω 18 Ω 100pF Figure 17 Typical Evaluation Board Schematic (PLL SYNTH) [CPZ] pin should be connected to R2 and C2, which are intermediate nodes, even if the Fast Lockup feature is not used. For the output destination from [CPZ] pin, see “Charge Pump and Loop Filter” on page 36. R2 and R2’ are connected in parallel with internal switch in Fast Lockup. These R2 and R2’ parallel resistance value is required for calculating loop bandwidth and phase margin in Fast Lockup. The on-resistance value of the internal switch is 150Ω for reference. 1. PVDD, CPVDD 10 F PVDD CPVDD 100pF 100pF 0.01 F 10 F 0.01 F LSI Figure 18 PVDD, CPVDD |
Numéro de pièce similaire - AK2400 |
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Description similaire - AK2400 |
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