參數(shù)資料
型號(hào)： 78Q2123-DB
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 27/38頁(yè)
文件大?。?/td> 0K
描述： BOARD DEMO 78Q2123 78Q2133
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 1
系列： *
DS_21x3_001
78Q2123/78Q2133 Data Sheet
Rev. 1.6
33
4.8
Isolation Transformers
Two simple 1:1 isolation transformers are required at the line interface. Transformers with integrated
common-mode chokes 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 MR19.15:14.
4.9
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 (typ)
50-100
W
Shunt Capacitance (max)
10
pF
Motional Capacitance (min)
10
pF
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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