參數(shù)資料
型號(hào): SI5018-B-GM
廠商: Silicon Laboratories Inc
文件頁(yè)數(shù): 4/22頁(yè)
文件大?。?/td> 0K
描述: IC CLOCK/DATA RECOVERY 20-QFN
標(biāo)準(zhǔn)包裝: 75
系列: SiPHY™, DSPLL®
類(lèi)型: 時(shí)鐘和數(shù)據(jù)恢復(fù)(CDR)
PLL:
主要目的: SONET/SDH,ATM 應(yīng)用
輸入: 時(shí)鐘
輸出: CML
電路數(shù): 1
比率 - 輸入:輸出: 1:2
差分 - 輸入:輸出: 是/是
頻率 - 最大: 2.7GHz
電源電壓: 2.375 V ~ 2.625 V
工作溫度: -40°C ~ 85°C
安裝類(lèi)型: 表面貼裝
封裝/外殼: 20-VFQFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝: 20-QFN(4x4)
包裝: 管件
Si5018
12
Rev. 1.3
pin micro leaded package (MLP) for device ground. This
pad should be connected directly to the analog supply
ground. See Figures 10 and 11 for the ground (GND)
pad location.
4.9. Bias Generation Circuitry
The Si5018 makes use of an external resistor to set
internal bias currents. The external resistor allows
precise generation of bias currents which significantly
reduces
power
consumption
versus
traditional
implementations that use an internal resistor. The bias
generation circuitry requires a 10 k
(1%) resistor
connected between REXT and GND.
4.10. Differential Input Circuitry
The Si5018 provides differential inputs for both the high
speed data (DIN) and the reference clock (REFCLK)
inputs. An example termination for these inputs is
shown in Figure 6. In applications where direct dc
coupling is possible, the 0.1
F capacitors may be
omitted. The DIN and REFCLK input amplifiers require
an input signal with a minimum differential peak-to-peak
voltage listed in Table 2 on page 6.
Figure 6. Input Termination for DIN and REFCLK (AC Coupled)
Figure 7. Single-Ended Input Termination for REFCLK (AC Coupled)
Dif f erential Driv er
Si5018
0.1 F
Zo = 50
Z o = 50
DIN +,
RF CLK +
DIN –,
RF CLK –
2.5 k
2. 5 k
10 k
102
VDD
GND
0.1
F
Clock
source
Si5018
0.1
F
Zo = 50
REFCLK +
REFCLK –
2.5 k
2.5 k
10 k
10 k
100
GND
VDD
102
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