전자부품 데이터시트 검색엔진 |
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HDMP-1022 데이터시트(PDF) 37 Page - Agilent(Hewlett-Packard) |
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HDMP-1022 데이터시트(HTML) 37 Page - Agilent(Hewlett-Packard) |
37 / 40 page 652 Supply Bypassing and Integrator Capacitor Figure 20 shows the location of the PLL integrator capacitors, power supply capacitors and required grounding for the Tx and Rx chips. Integrating Capacitor The integrating capacitors (C2) are required by both the Tx and Rx to function properly. These caps are used by the PLL for frequency and phase lock and directly set the stability and lockup times. The designed value of C2 is 0.1 µF, with a tolerance of ± 10%. The internal charging currents are scaled with the DIV0 and DIV1 settings such that the same capacitor value works with all four frequency bands. Larger values of C2 improve jitter performance, but extend the lockup times. Power Supply Bypassing and Grounding The G-LINK chip set has been tested to work well with a single ground plane, assuming that it is a fairly clean ground plane. Thus, all of the separate grounds (VCC, and VCC_TTL) can be connected onto this plane. The bypassing of VCC to ground should be accomplished with a capacitor (C1) of 0.1 µF. In some instances, if the VCO of either the Tx or the Rx are at the extreme high end, the frequency of STRBOUT exceeds the maxi- mum frequency allowed by the hosts. In this case, it is recom- mended that a diode clamp, D1, be used across the integrating cap C2, such that the upper frequency HP HDMP-1022 LOT# Tx DATECODE C2 D1 C1 R1 C1 R1 C1 R1 CAP0B CAP0A CAP1A CAP1B HP HDMP-1024 LOT# Rx DATECODE C2 D1 C1 R1 C1 R1 C1 R1 R2 R2 C1 = BYPASS CAPACITOR C2 = PLL INTEGRATOR CAPACITOR D1 = OPTIONAL CLAMPING DIODE 0.1 µF 0.1 µF Figure 20a. HDMP-1022 (Tx) Power Supply Bypass. Figure 20b. HDMP-1022 (Rx) Power Supply Bypass. |
유사한 부품 번호 - HDMP-1022 |
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유사한 설명 - HDMP-1022 |
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