參數(shù)資料
型號： ZL30102QDG1
廠商： ZARLINK SEMICONDUCTOR INC
元件分類： 通信及網(wǎng)絡(luò)
英文描述： T1/E1 Stratum 4/4E Redundant System Clock Synchronizer for DS1/E1 and H.110
中文描述： SPECIALTY TELECOM CIRCUIT, PQFP64
封裝： 10 X 10 MM, 1 MM HEIGHT, LEAD FREE, MS-026ACD, TQFP-64
文件頁數(shù)： 33/48頁
文件大?。?/td> 944K
代理商： ZL30102QDG1
ZL30102
Data Sheet
33
Zarlink Semiconductor Inc.
6.2.2 Crystal Oscillator
Alternatively, a Crystal Oscillator may be used. A complete oscillator circuit made up of a crystal, resistor and
capacitors is shown in Figure 20.
The accuracy of a crystal oscillator depends on the crystal tolerance as well as the load capacitance tolerance.
Typically, for a 20 MHz crystal specified with a 32 pF load capacitance, each 1 pF change in load capacitance
contributes approximately 9 ppm to the frequency deviation. Consequently, capacitor tolerances and stray
capacitances have a major effect on the accuracy of the oscillator frequency.
The crystal should be a fundamental mode type - not an overtone. The fundamental mode crystal permits a simpler
oscillator circuit with no additional filter components and is less likely to generate spurious responses. A typical
crystal oscillator specification and circuit is shown in Table 8 and Figure 20 respectively.
.
Figure 20 - Crystal Oscillator Circuit
6.3 Power Up Sequence
The ZL30102 requires that the 3.3 V supply is not powered up after the 1.8 V supply. This is to prevent the risk of
latch-up due to the presence of parasitic diodes in the IO pads.
Two options are given:
1. Power-up the 3.3 V supply fully first, then power up the 1.8 V supply
2. Power up the 3.3 V supply and the 1.8 V supply simultaneously, ensuring that the 3.3 V supply is never lower
than a few hundred millivolts below the 1.8 V supply (e.g., by using a schottky diode or controlled slew rate)
1
Frequency
20 MHz
2
Tolerance
as required
3
Oscillation mode
fundamental
4
Resonance mode
parallel
5
Load capacitance
as required
6
Maximum series resistance
50
Table 8 - Typical Crystal Oscillator Specification
OSCo
1 M
20 MHz
ZL30102
OSCi
100
1
μ
H
The 100
resistor and the 1
μ
H inductor may improve
stability and are optional.
相關(guān)PDF資料
PDF描述
ZL30102 T1/E1 Stratum 4/4E Redundant System Clock Synchronizer for DS1/E1 and H.110
ZL30102QDG T1/E1 Stratum 4/4E Redundant System Clock Synchronizer for DS1/E1 and H.110
ZL30105QDG1 T1/E1/SDH Stratum 3 Redundant System Clock Synchronizer for AdvancedTC TM and H.110
ZL30105 Power Clamp On Multimeter; DMM Type:Clamp; No. of Digits/Alpha:3-3/4; DMM Response Type:True RMS; Approval Categories:CAT III 600V; Calibrated:No; Current Measuring Range:0-400.0A; Current Setting AC:400A RoHS Compliant: NA
ZL30105QDG Digital Clamp-On Meter; DMM Type:Clamp; No. of Digits/Alpha:3-3/4; DMM Response Type:True RMS; Calibrated:No; Current Setting AC:1000A; Resistance Measuring Range:400 Ohm to 10 MOhm; Voltage Measuring Range AC:600V RoHS Compliant: NA
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ZL30105 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:T1/E1/SDH Stratum 3 Redundant System Clock Synchonizer for AdvancedTCA and H.110
ZL30105_05 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:T1/E1/SDH Stratum 3 Redundant System Clock Synchronizer for AdvancedTC TM and H.110
ZL30105QDG 制造商:Zarlink Semiconductor Inc 功能描述:CLOCK SYNTHESIZER 64TQFP - Bulk
ZL30105QDG1 制造商:Microsemi Corporation 功能描述:CLOCK SYNTHESIZER 64TQFP - Trays 制造商:Microsemi Corporation 功能描述:IC Pb Free T1/E1 System Synchronizer 制造商:Zarlink Semiconductor Inc 功能描述:CLOCK SYNTHESIZER 64TQFP - Trays 制造商:Zarlink Semiconductor Inc 功能描述:IC Pb Free T1/E1 System Synchronizer
ZL30106 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:SONET/SDH/PDH Network Interface DPLL
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