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參數(shù)資料
| 型號： | HCPL-261A |
| 英文描述： | HCMOS Compatible, High CMR, 10 MBd Optocouplers |
| 中文描述： | HCMOS兼容，高CMR，10 MBd的光電耦合器 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 252K |
| 代理商： | HCPL-261A |
1-178
Figure 20. Recommended Drive Circuit for HCPL-261A/-261N Families for High-
CMR (Similar for HCPL-263A/-263N).
Application Information
Common-Mode Rejection for
HCPL-261A/HCPL-261N
Families:
Figure 20 shows the recom-
mended drive circuit for the
HCPL-261N/-261A for optimal
common-mode rejection
performance. Two main points to
note are:
1. The enable pin is tied to V
CC
rather than floating (this
applies to single-channel parts
only).
2. Two LED-current setting
resistors are used instead of
one. This is to balance I
LED
variation during common-
mode transients.
If the enable pin is left floating, it
is possible for common-mode
transients to couple to the enable
pin, resulting in common-mode
failure. This failure mechanism
only occurs when the LED is on
and the output is in the Low
State. It is identified as occurring
when the transient output voltage
rises above 0.8 V. Therefore, the
enable pin should be connected
to either V
CC
or logic-level high
for best common-mode
performance with the output low
(CMR
L
). This failure mechanism
is only present in single-channel
parts (HCPL-261N, -261A,
-061N, -061A) which have the
enable function.
Also, common-mode transients
can capacitively couple from the
LED anode (or cathode) to the
output-side ground causing
current to be shunted away from
the LED (which can be bad if the
LED is on) or conversely cause
current to be injected into the
LED (bad if the LED is meant to
be off). Figure 21 shows the
parasitic capacitances which
exists between LED
*Higher CMR May Be Obtainable by Connecting Pins 1, 4 to Input Ground (Gnd1).
ENABLE
(IF USED)
GND BUS (BACK)
V BUS (FRONT)
N.C.
N.C.
N.C.
N.C.
OUTPUT 1
OUTPUT 2
ENABLE
(IF USED)
0.1
μ
F
0.1
μ
F
10 mm MAX. (SEE NOTE 16)
SINGLE CHANNEL PRODUCTS
0.01 μF
350
74LS04
OR ANY TOTEM-POLE
OUTPUT LOGIC GATE
VO
VCC+
8
7
6
1
3
SHIELD
5
2
4
HCPL-261A/261N
GND
GND2
357
(MAX.)
VCC
357
(MAX.)
*
*
*
HIGHER CMR MAY BE OBTAINABLE BY CONNECTING PINS 1, 4 TO INPUT GROUND (GND1).
GND1
Figure 19. Recommended Printed Circuit Board Layout.
GND BUS (BACK)
V BUS (FRONT)
OUTPUT 1
OUTPUT 2
0.1
μ
F
10 mm MAX. (SEE NOTE 16)
DUAL CHANNEL PRODUCTS
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HCPL-261N | High CMR, High Speed TTL Compatible Optocouplers |
| HCPL-2630 | High CMR, High Speed TTL Compatible Optocouplers |
| HCPL-2631 | High CMR, High Speed TTL Compatible Optocouplers |
| HCPL-263A | High CMR, High Speed TTL Compatible Optocouplers |
| HCPL-263N | High CMR, High Speed TTL Compatible Optocouplers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HCPL-261A#020 | 功能描述:高速光耦合器 10MBd 1Ch 3mA RoHS:否 制造商:Avago Technologies 電流傳遞比: 最大波特率: 最大正向二極管電壓:1.75 V 最大反向二極管電壓:5 V 最大功率耗散:40 mW 最大工作溫度:+125 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-5 封裝:Tube |
| HCPL-261A#060 | 功能描述:高速光耦合器 10MBd 1Ch 3mA RoHS:否 制造商:Avago Technologies 電流傳遞比: 最大波特率: 最大正向二極管電壓:1.75 V 最大反向二極管電壓:5 V 最大功率耗散:40 mW 最大工作溫度:+125 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-5 封裝:Tube |
| HCPL-261A#300 | 功能描述:高速光耦合器 10MBd 1Ch 3mA RoHS:否 制造商:Avago Technologies 電流傳遞比: 最大波特率: 最大正向二極管電壓:1.75 V 最大反向二極管電壓:5 V 最大功率耗散:40 mW 最大工作溫度:+125 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-5 封裝:Tube |
| HCPL-261A#500 | 功能描述:高速光耦合器 10MBd 1Ch 3mA RoHS:否 制造商:Avago Technologies 電流傳遞比: 最大波特率: 最大正向二極管電壓:1.75 V 最大反向二極管電壓:5 V 最大功率耗散:40 mW 最大工作溫度:+125 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-5 封裝:Tube |
| HCPL-261A#560 | 功能描述:高速光耦合器 10MBd 1Ch 3mA RoHS:否 制造商:Avago Technologies 電流傳遞比: 最大波特率: 最大正向二極管電壓:1.75 V 最大反向二極管電壓:5 V 最大功率耗散:40 mW 最大工作溫度:+125 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-5 封裝:Tube |
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