- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄351989 > 4605X-101-222 Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits PDF資料下載
參數(shù)資料
| 型號： | 4605X-101-222 |
| 英文描述： | Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits |
| 中文描述： | WIDERSTAND NETZWERK DICKFILM 2K2 5ST |
| 文件頁數(shù)： | 39/62頁 |
| 文件大?。?/td> | 1883K |
| 代理商： | 4605X-101-222 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁當前第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁
Specifications are subject to change without notice.
320
General Description
Continual advances in digital IC technology are creating
stringent demands on EMI/RFI levels in equipment.
EMI/RFI low pass filters are required in personal
computers, data terminals, test equipment and process con-
trollers for high frequency suppression into or out of elec-
tronic equipment.
Filter Selection and Design Considerations
The “roll-off” frequency fc, defined as the frequency at
which the filter passes one-half the power it receives at its
input terminal, can be specified from the low megahertz
range up to about 100MHz. This frequency, also known as
the “-3 dB” frequency, will be determined by the R and C
values chosen. Custom resistor and capacitor values are
available to optimize system performance.
The specification of these values will depend on con-
straints relating to noise frequencies, system performance
and driver loading. The following procedure is suggested to
choose appropriate values of R and C.
The first step is to determine the desired roll-off
frequency of the filter, which will lie between the signal
frequency and the dominant frequencies of the EMI/RFI
noise. By determining the pole of the filter (setting the
denominator of the transfer function equal to zero), the
roll-off frequency can be expressed in terms of R and C:
fc =
RS + RL + 2R
2
πC(R + RS)(R + RL)
Furthermore, the RC combination must be chosen so
that the additional RC time delay will not result in exceeding
the sampling window of the receiving IC, due to excessive
lengthening of signal rise and fall times.
Rise time from 10% to 90% of the waveform amplitude
can be calculated in terms of the circuit’s RC time constant
using the 1 –exp (–t/RC) relationship for a charging capacitor.
At 10%, t L = 0.1 time constants, and at 90%, tH = 2.3 time
constants. “Time constant” equals RthC, where Rth is the
Thevenin-equivalent resistance as seen by the capacitor.
Therefore, equating the difference in the two times to
the maximum tolerable rise (or fall) time:
tmax = t H - tL = 2.2RthC
tmax = 2.2
(R + RS)(R + RL)C
RS + RL + 2R
A final consideration is the insertion loss. As mentioned
previously, the voltage drop across the two resistors will
attenuate the voltage reaching the load. Normally, logic high
and low levels will still be within valid limits. The signal
attenuation can be minimized by choosing small R values rel-
ative to the load impedance. Typical values for R range from
10 to 50 ohms.
Bourns Low-pass Filters for EMI/RFI Suppression
NO. OF LINES
BOURNS P/N
PACKAGE
7
4118R-601-RC/CC
8
4120R-601-RC/CC
DIP
8
4420P-601-RC/CC
Wide Body SMD
RC
R
CC
C
250
25
500
50pF
270
27
101
100pF
470
47
181
180pF
820
82
201
200pF
101
100
Standard Resistance/Capacitance Values And Codes
Application Notes – EMI/RFI Filters 601 Series
相關PDF資料 |
PDF描述 |
|---|---|
| 4605X-101-223 | WIDERSTAND NETZWERK DICKFILM 22K 5ST |
| 4605X-101-472 | Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits |
| 4607X102 | Interface IC |
| 4607X103 | Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits |
| 4607X104 | Interface IC |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 4605X-101-222F | 制造商:BOURNS 制造商全稱:Bourns Electronic Solutions 功能描述:4600X Series - Thick Film Conformal SIPs |
| 4605X-101-222LF | 功能描述:電阻器網(wǎng)絡與陣列 5pins 2.2Kohms Bussed RoHS:否 制造商:Vishay/Thin Film 產(chǎn)品類型:Networks 電路類型:Divider 電阻器數(shù)量: 電阻數(shù)值:10 kOhms 容差:0.1 % 溫度系數(shù): 管腳數(shù)量:3 工作溫度范圍:- 55 C to + 155 C 尺寸:1.02 mm W x 3.05 mm L x 1.4 mm H 引線間隔: 端接類型:SMD/SMT 封裝:Reel |
| 4605X-101-222LF | 制造商:Bourns Inc 功能描述:RESISTORS NETWORKS THICK FILM NETWORK C |
| 4605X-101-223 | 功能描述:電阻器網(wǎng)絡與陣列 2.2K 5Pin Bussed RoHS:否 制造商:Vishay/Thin Film 產(chǎn)品類型:Networks 電路類型:Divider 電阻器數(shù)量: 電阻數(shù)值:10 kOhms 容差:0.1 % 溫度系數(shù): 管腳數(shù)量:3 工作溫度范圍:- 55 C to + 155 C 尺寸:1.02 mm W x 3.05 mm L x 1.4 mm H 引線間隔: 端接類型:SMD/SMT 封裝:Reel |
| 4605X-101-223LF | 功能描述:電阻器網(wǎng)絡與陣列 5pins 22Kohms Bussed RoHS:否 制造商:Vishay/Thin Film 產(chǎn)品類型:Networks 電路類型:Divider 電阻器數(shù)量: 電阻數(shù)值:10 kOhms 容差:0.1 % 溫度系數(shù): 管腳數(shù)量:3 工作溫度范圍:- 55 C to + 155 C 尺寸:1.02 mm W x 3.05 mm L x 1.4 mm H 引線間隔: 端接類型:SMD/SMT 封裝:Reel |
發(fā)布緊急采購，3分鐘左右您將得到回復。