Evaluation Board for ACNW261L / ACNT-H61L
Ultra Low Power 10MBd Digital CMOS Optocouplers
User Guide
Introduction
The ACNW261L (single-channel 400mil DIP8) and ACNTH61L (single-channel Stretched SO8) are 10MBd CMOS
optocouplers. These optocouplers utilize the latest CMOS
IC technology to achieve outstanding performance with
very low power consumption. Basic building blocks are
high speed LEDs and CMOS detector ICs. Each detector incorporates an integrated photodiode, a high speed transimpedance amplier, and a voltage comparator with an
output driver.
Applications
• Digital eld bus isolation: CANBus, RS485, USB
• Microprocessor system interface
• DC/DC converter
• Servo Motor
Anode
Cathode
8
1
NC
2
3
VDD
7
VE
6
VO
Anode
Cathode
NC
1
2
3
8
7
6
About Evaluation Board
The ACNW261L / ACNT-H61L evaluation board allows designers to evaluate Avago digital optocouplers easily with
their system setup.
This evaluation board also suits other Avago digital optocouplers of similar package type. The top part of the
board caters for 400mil DIP8 package type while the bottom part of the board caters for 14.2mm Stretched SO8
type. For more information on all Avago digital optocouplers, you may refer to Avago Optoisolation Products Selection Catalog.
Features of the evaluation board as listed:
• Allows input peaking capacitor placement for speed
improvement evaluation
• Able to employ input split anode/cathode resistors for
improved CMR performance
• Board V-cut for separate evaluation of 400mil DIP8 and
VDD
NC
Vo
14.2mm Stretched SO8 type packages optocouplers
Top view of evaluation board is pictured in Figure 1 and
schematic diagram in Figure 2.
4
NC
Shield
ACNW261L
(400mil DIP8)
5
GND
NC
4
Shield
ACNT-H61L
(14.2mm Stretched S08)
GND
5
Input pin / pad
Isolation
VDD test point
Output test point
LED input resistor
Figure 1. ACNW261L / ACNT-H61L Evaluation Board (Top View)
Gnd test points
Work area for
additional
components
Output test point
Isolation
Figure 2. Schematic Diagram for ACNW261L / ACNT-H61L Evaluation Board
2
Board Connection and Operation
A peaking capacitor (C1–C2, C4–C5) can be placed across
the input current limit resistor (R1–R4) to achieve enhanced speed performance (Figure 3). The capacitance
value depends on the rise/fall time of the input signal,
supply voltages and LED input driving current. Refer to
optocoupler’s datasheet for more details.
C
peak
V
DD2
+
V
in
−
GND
1
R
1
V
0
0.1µF
R
2
GND
SHIELD
2
Figure 3. Connection of peaking cap (Cpeak) across input resistor to improve
speed performance
For ACNW261L (400mil DIP8 single-channel)
1. Attach 3.3 V or 5 V pulse input signal to “ANODE1”. Input
resistors are built-in.
2. Connect input ground at “CATHODE1”.
3. Attach 3.3 V or 5 V power supply at the isolated output
side “VDD1” and “GND1”.
4. Probe the output signals at “VO1”.
The input cathode pins connect in series to case size 1206
SMD footpath. This allows split input resistors to connect
at both anode and cathode inputs for improved CMR performance (Figure 4).
R
1
V
DD
0.1µF
74LS04 or
any totem-pole
output
logic gate
GND
R
2
1
Shield
Figure 4. Recommended drive circuit for high CMR
For ACNT-H61L (14.2mm Stretched SO8)
1. Attach 3.3 V or 5 V pulse input signal to “ANODE2”. Input
resistors are built-in.
2. Connect input ground at “CATHODE2”.
3. Attach 3.3 V or 5 V power supply at the isolated output
side “VDD2” and “GND2”.
4. Probe the output signals at “VO2”.
V
DD2
V
O
GND
2
DISCLAIMER: Avago’s products and software are not specically designed, manufactured or authorized for sale
as parts, components or assemblies for the planning, construction, maintenance or direct operation of a nuclear facility or for use in medical devices or applications. Customer is solely responsible, and waives all rights to
make claims against Avago or its suppliers, for all loss, damage, expense or liability in connection with such use.
For product information and a complete list of distributors, please go to our web site: www.avagotech.com
Avago, Avago Technologies, and the A logo are trademarks of Avago Technologies in the United States and other countries.
Data subject to change. Copyright © 2005-2015 Avago Technologies. All rights reserved.
AV02-4757EN - January 15, 2015
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