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ICS841S012DI Datasheet(PDF) 15 Page - Integrated Device Technology |
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ICS841S012DI Datasheet(HTML) 15 Page - Integrated Device Technology |
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15 / 22 page  ICS841S012DKI REVISION A JULY 20, 2009 15 ©2009 Integrated Device Technology, Inc. ICS841S012DI Data Sheet CRYSTAL-TO-0.7V DIFFERENTIAL HCSL/LVCMOS FREQUENCY SYNTHESIZER SCHEMATIC EXAMPLE Figure 7 shows an example of the ICS841S012DI application schematic. In this example, the device is operated at V D D= VDDOB = V DDOC = 3.3V. The 18pF parallel resonant 25MHz crystal is used. The C1= 33pF and C2 = 33pF are recommended for frequency accuracy. For different board layouts, the C1 and C2 may be slightly adjusted for optimizing frequency accuracy. Two examples of HCSL and one example of LVCMOS termination are shown in this schematic. The decoupling capacitors should be located as close as possible to the power pin. FIGURE 7. ICS841S012DI SCHEMATIC EXAMPLE QB0 IREF REF_OE BY PASS XTAL_OUT XTAL_IN REF_SEL Logic Control Input Examples Set Logic Input to '0' Set Logic Input to '1' To Logic Input pins To Logic Input pins Note: This device requires a reset signal at nMR after power-up to function properly. VDD=3.3V Using for PCI Express Add-In Card VDDO=3.3V Using for PCI Express Point-to-Point Connection HCSL Termination LVCMOS QA1 QA0 REF_IN LVCMOS REF_OUT1 REF_OUT1 REF_OUT0 nMR VDDA nQA1 C10 0.1u RU2 Not Install C6 0.01u R6 43 R2 10 C11 0.1u TL5 Zo = 50 C1 15pF R10 475 Ohm + - R1 35 C9 0.1u RD2 1K R4 10 C8 0.1u + - C12 0.1u RU1 1K C7 0.1u R7 33 R3 30 C14 0.1u R5 33 C15 0.1u TL3 Zo = 50 Zo = 50 Ohm Zo = 50 R9 50 TL6 Zo = 50 C16 0.1u C2 22pF C5 10u C3 0.01u C13 0.1u R11 50 Zo = 50 R12 50 TL7 Zo = 50 R8 50 RD1 Not Install X1 25MHz, CL=18pF C4 10u Ro ~ 7 Ohm Q1 Driv er_LVCMOS VDDO VDD VDD VDDO VDD VDD VDDO VDD VDD VDD nQA0 VDDO VDD U1 ICS841S012DI VDD_REFOUT 1 REF_OUT0 2 REF_OUT1 3 GND 4 GND 5 REF_IN 6 VDD 7 REF_SEL 8 XTAL_IN 9 XTAL_OUT 10 BY PASS 11 REF_OE 12 nMR 13 VDD 14 GND 35 IREF 34 QA0 33 nQA0 32 QA1 31 VDDA 37 GND 36 nQA1 30 VDD 29 VDDA 38 VDDOC 42 QC 41 GND 40 QBC_OE 39 (U1, 29) (U1, 1) (U1, 28) (U1, 52) (U1, 48) (U1, 7) (U1, 14) (U1, 56) (U1, 42) (U1, 43) VDDA Note: External tuning capacitors must be used for proper operation. |
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