參數(shù)資料
型號: RTL8305SB
英文描述: RTL8305SB
中文描述: RTL8305SB
文件頁數(shù): 52/66頁
文件大?。?/td> 963K
代理商: RTL8305SB
RTL8305SB
2002/04/09
52
Rev.1.0
7.3.17 2.5V Power Generation
The RTL8305SB can use a PNP transistor to generate 2.5V from a 3.3V power supply. This 2.5V is used for the digital core
and analog receiver circuits. Do not use one PNP transistor for more than one RTL8305SB chip, even if the rating is enough:
Use one transistor for each RTL8305SB chip.
Do not connect any inductor (bead) directly between the collector of PNP transistor and VDDAL. This will affect the stability
of the 2.5V power significantly if the inductor (bead) exists.
RTL8305SB
VCTRL
3.3V
VDDH
VDDL
VDDH: 3.3V
VDDL: 2.5V
2.5V
3.3V
Parameter
Symbol
Collector-base voltage
V
CBO
Collector-emitter voltage
V
CEO
Emitter-base voltage
V
EBO
Collector current
I
C
Collector power dissipation
P
C
Junction temperature
Tj
Storage temperature
Tstg
Table 9: Example of Power Transistor 2SB1197K
Absolute maximum ratings (Ta=25
°
C)
For more information, refer to http://www.rohm.com
47uF/10uF/0.1uF
2SB1197K
Ic(max.)
=800mA
Figure 8: Use PNP Transistor to transform 3.3V into 2.5V
Limits
Unit
V
V
V
A(DC)
W
°
C
°
C
-40
-32
-5
-0.8
0.2
150
-55~+150
7.3.18 Crystal/Oscillator
The frequency is 25Mhz. The maximum Frequency Tolerance is +/- 100ppm. The maximum Jitter is 150 ps Peak to Peak.
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