參數(shù)資料
型號(hào)： MCP40D17T-502E/LT
廠商： Microchip Technology
文件頁(yè)數(shù)： 37/43頁(yè)
文件大?。?/td> 0K
描述： IC DGTL POT 5K 128TAPS SC70-6
標(biāo)準(zhǔn)包裝： 1
接片： 128
電阻（歐姆）： 5k
電路數(shù)： 1
溫度系數(shù)： 標(biāo)準(zhǔn)值 150 ppm/°C
存儲(chǔ)器類型： 易失
接口： I²C
電源電壓： 1.8 V ~ 5.5 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 6-TSSOP，SC-88，SOT-363
供應(yīng)商設(shè)備封裝： SC-70-6
包裝： 標(biāo)準(zhǔn)包裝
產(chǎn)品目錄頁(yè)面： 674 (CN2011-ZH PDF)
其它名稱： MCP40D17T-502E/LTDKR
Micrel, Inc.
KSZ8041NLJ
April 2010
42
M9999-040110-1.0
Selection of Isolation Transformer
A 1:1 isolation transformer is required at the line interface. An isolation transformer with integrated common-mode chokes
is recommended for exceeding FCC requirements.
The following table gives recommended transformer characteristics.
Parameter
Value
Test Condition
Turns ratio
1 CT : 1 CT
Open-circuit inductance (min.)
350H
100mV, 100kHz, 8mA
Leakage inductance (max.)
0.4H
1MHz (min.)
Inter-winding capacitance (max.)
12pF
D.C. resistance (max.)
0.9
Insertion loss (max.)
-1.0dB
0MHz – 65MHz
HIPOT (min.)
1500Vrms
Table 15. Transformer Selection Criteria
The Pulse Engineering device in the following table gives the recommended transformer configuration. At the time of
publication, there is no extended high temperature magnetic available. Contact magnetic vendor for availability of
extended high temperature rated (-40
oC to +125oC) transformer.
Magnetic Manufacturer
Part Number
Auto MDI-X
Number of Port
Pulse Engineering
HX1188NL
Yes
1
Table 16. Single Port Magnetic – Recommended Transformer Configuration
Selection of Reference Crystal
Characteristics
Value
Units
Frequency
25
MHz
Frequency tolerance (max)
±50
ppm
Load capacitance (max)
22
pF
Series resistance
40
Table 17. Typical Reference Crystal Characteristics
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