Electronic Components Datasheet Search |
|
M2080 Datasheet(PDF) 3 Page - Integrated Circuit Systems |
|
M2080 Datasheet(HTML) 3 Page - Integrated Circuit Systems |
3 / 14 page M2080/81/82 Datasheet Rev 0.4 3 of 14 Revised 30Jul2004 Integr ated Circuit Systems , Inc. ● Netw o r ki ng & C o mmun ica t io ns ● ww w. icst.com ● tel (5 08) 85 2-54 00 M2080/81/82, M2085/86/87 VCSO FEC PLL WITH AUTOSWITCH FOR SONET/OTN Preliminar y In f o r m atio n Integrated Circuit Systems, Inc. DETAILED BLOCK DIAGRAM Figure 3: Detailed Block Diagram DIVIDER SELECTION TABLES Mfin Divider Look-Up Tables (LUT) The FIN_SEL1:0 pins select the feedback divider value (“Mfin”), which sets the overall PLL ratio range. Since the VCSO frequency is fixed, this allows input reference selection. The look-up tables vary by device variant. M2080/81/82: Mfin Value LUT (Includes Divide by 32) M2085/86/87: Mfin Value LUT (Includes Divide by 16) Mfec and Rfec Divider Look-Up Tables (LUTs) The FEC_SEL pins select the Mfec/Rfec divider ratio. The look-up tables vary by device variant. The Mfec and Rfec values also establish phase detector frequency. A lower phase detector frequency improves jitter tolerance and lowers loop bandwidth. M2080/85: FEC Map LUT, OTU1 (255/238) and OTU2 (255/237) M2081/86: FEC De-map LUT, OTU1 (238/255) or OTU2 (237/255) Use this option for either OTU1 or OTU2 de-mapping applications, but not both. Phase Locked Loop (PLL) M2080 Series SAW Delay Line Phase Shifter VCSO C POST C POST VC nVC R POST nOP_OUT OP_OUT R POST R LOOP R LOOP C LOOP C LOOP OP_IN nOP_IN PLL Phase Detector Loop Filter Amplifier External Loop Filter Components FEC_SEL1:0 FIN_SEL1:0 Rfec Div MUX 0 REF_SEL DIF_REF0 nDIF_REF0 1 Mfin Divider LUT Mfin Divider (1, 4, 8, 32) or (1, 4, 8, 16) Mfec Div NBW R IN R IN Mfec / Rfec Divider LUT DIF_REF1 nDIF_REF1 Auto Ref Sel 0 1 LOL Phase Detector REF_ACK AUTO LOL FOUT nFOUT CML or PECL Options P Divider (1, 4, 8, 32, or TriState) P_SEL2:0 P Divider LUT 2 2 3 FIN_SEL1:0 Mfin Value Sample Input Reference Freq. (MHz) Options For M20801, M2081 & M20822 Note 1: For M2080 with Fvcso = 666.5143 or 669.3266 Note 2: For M2081 and M2082 with Fvcso = 622.0800. 0 0 32 19.44 0 1 8 77.76 10 4 155.52 11 1 622.08 Table 3: M2080/81/82: Mfin Value LUT (Includes Divide by 32) FIN_SEL1:0 Mfin Value Sample Input Reference Freq. (MHz) Options For M20851, M2086 & M20872 Note 1: For M2085 with Fvcso = 666.5143 or 669.3266 Note 2: For M2086 and M2087 with Fvcso = 622.0800. 0 0 16 38.88 0 1 8 77.76 10 4 155.52 11 1 622.08 Table 4: M2085/86/87: Mfin Value LUT (Includes Divide by 16) FEC_SEL1:0 1 0 Mfec Rfec Description Base Input Rate (MHz) Fvcso = Base Output Rate (MHz) For M2080 or M2085 with Fvcso = 666.5143 (OTU1 FEC rate): 0 0 15 14 255/238 OC-48 to OTU1 encode 622.08 666.5143 0 1 15 15 OTU1 repeater or jitter attenuator 666.5143 666.5143 For M2080 or M2085 with Fvcso = 669.3266 (OTU2 FEC rate): 1 0 85 79 255/237 OC-192 to OTU2 encode 622.08 669.3266 1 1 85 85 OTU2 repeater or jitter attenuator 669.3266 669.3266 Table 5: M2080/85: FEC Map LUT, OTU1 (255/238) and OTU2 (255/237) FEC_SEL1:0 1 0 Mfec Rfec Description Base Input Rate (MHz) Fvcso = Base Output Rate (MHz) For M2081 or M2086 with Fvcso = 622.08 (OTU1 or OTU2 FEC rate): 0 0 79 85 237/255 OTU2 to OC-192 decode 669.3266 622.08 0 1 79 79 OC-192 repeater or jitter attenuator 622.08 622.08 1 0 14 15 238/255 OTU1 to OC-48 decode 666.5143 622.08 1 1 14 14 OC-48 repeater or jitter attenuator 622.08 622.08 Table 6: M2081/86: FEC De-map LUT, OTU1 (238/255) or OTU2 (237/255) |
Similar Part No. - M2080 |
|
Similar Description - M2080 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |