2009 Teridian Semiconductor Corporation Rev 1.3 ISOL" />
參數(shù)資料
型號(hào)： 78Q2120C09-CGTR/F
廠商： Maxim Integrated
文件頁數(shù)： 25/35頁
文件大?。?/td> 0K
描述： IC TXRX 10/100BASE-TX 64LQFP
標(biāo)準(zhǔn)包裝： 1,500
系列： *
78Q2120C
10/100BASE-TX
Transceiver
Page: 31 of 35
2009 Teridian Semiconductor Corporation
Rev 1.3
ISOLATION TRANSFORMERS
Two simple 1:1 isolation transformers are required at the line interface. Transformers with integrated common-
mode choke are recommended for exceeding FCC requirements. This table gives the recommended line
transformer characteristics:
NAME
VALUE
CONDITION
Turns Ratio
1 CT : 1 CT
± 5%
Open-Circuit Inductance
350
H (min)
@ 10 mV, 10 kHz
Leakage Inductance
0.40
H (max)
@ 1 MHz (min)
Inter-Winding Capacitance
25 pF (max)
D.C. Resistance
0.9
(max)
Insertion Loss
0.4 dB (typ)
0 - 65 MHz
HIPOT
1500 Vrms
Note: The 100Base-TX amplitude specifications assume a transformer loss of 0.4 dB. For the transmit line
transformer with higher insertion losses, up to 1.2 dB of insertion loss can be compensated by selecting the
appropriate setting in the Transmit Amplitude Selection bits in register MR19.11:10.
REFERENCE CRYSTAL
If the internal crystal oscillator is to be used, a crystal with the following characteristics should be chosen:
NAME
VALUE
UNITS
Frequency
25.00000
MHz
Load Capacitance*
4**
pF
Frequency Tolerance
±50
PPM
Aging
±2
PPM/yr
Temperature Stability ( 0 - 70
oC)
±5
PPM
Oscillation Mode
Parallel Resonance, Fundamental Mode
Parameters at 25
oC ± 2oC ; Drive Level = 0.5 mW
Drive Level
50 - 100
W
Shunt Capacitance (max)
8
pF
Motional Capacitance (min)
10
f F
Series Resistance (max)
60
Spurious Response (max)
> 5 dB below main within 500 kHz
* Equivalent differential capacitance across the XTLP/XTLN pins.
** If crystal with a larger load is used, external shunt capacitors to ground should be added to make up the
equivalent capacitance difference.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
78Q2120C09-DB 功能描述:以太網(wǎng)開發(fā)工具 78Q2120C09 Demo Boa RoHS:否 制造商:Micrel 產(chǎn)品:Evaluation Boards 類型:Ethernet Transceivers 工具用于評(píng)估:KSZ8873RLL 接口類型:RMII 工作電源電壓:
78Q2120-CGT 制造商:未知廠家 制造商全稱:未知廠家 功能描述:10/100BASE-TX Ethernet Transceiver
78Q2123 制造商:TERIDIAN 制造商全稱:TERIDIAN 功能描述:10/100BASE-TX Transceiver
78Q2123/F 功能描述:以太網(wǎng) IC 10/100 Fast Ethernet MicroPHY RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray
78Q2123/F1 功能描述:以太網(wǎng) IC RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray
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