參數(shù)資料
型號(hào)： R1122N2.8A-TL
廠商： Ricoh Co., Ltd.
英文描述： Analog IC
中文描述： 模擬IC
文件頁(yè)數(shù)： 21/22頁(yè)
文件大?。?/td> 295K
代理商： R1122N2.8A-TL
Rev. 1.10
- 21 -
n
TECHNICAL NOTES
When using these ICs, be sure to consider following points:
l
correctly.
l
l
In these ICs, phase compensation is made for securing stable operation even if the load current is varied. For this purpose, be
sure to use a capacitor C
OUT
with good frequency characteristics and ESR (Equivalent Series Resistance) of which is in the
range described as follows:
Make V
DD
and GND line sufficient. When the impedance of these is high, there is a case to pick up the noise or not to work
Connect the capacitor with a capacitance as much as 2.2
m
F between V
DD
and GND as close as possible.
Set external components, especially Output Capacitor, as close as possible to the ICs and make wiring shortest.
3
4
1
2
R1122NXX1B
CE
VDD
VOUT
GND
ESR
Ceramic
Cap.
IOUT
S.A.
Spectrum
Analyzer
VIN
Ceramic
Cap.
Measuring Circuit for white noise; R1122NXX1B
The relations between I
OUT
(Output Current) and ESR of Output Capacitor are shown below. The conditions when the white
noise level is under 40
m
V(Avg.) are marked as the hatched area in the graph.
(note: When the additional ceramic capacitors are connected to the Output Pin with Output capacitor for phase compensation,
the operation might be unstable. Because of this, test these ICs with as same external components as ones to be used on the
PCB.)
<measuring conditions>
(1) V
IN
=V
OUT
+1V
(2) Frequency band :10Hz to 1MHz
(3) Temperature : 25
°
C
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