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Evaluation Board for ACNW261L / ACNT-H61L
Ultra Low Power 10MBd Digital CMOS Optocouplers
User Guide
Introduction
The ACNW261L (single-channel 400mil DIP8) and ACNT-
H61L (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 in-
corporates an integrated photodiode, a high speed tran-
simpedance 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
About Evaluation Board
The ACNW261L / ACNT-H61L evaluation board allows de-
signers to evaluate Avago digital optocouplers easily with
their system setup.
This evaluation board also suits other Avago digital op-
tocouplers of similar package type. The top part of the
board caters for 400mil DIP8 package type while the bot-
tom part of the board caters for 14.2mm Stretched SO8
type. For more information on all Avago digital optocou-
plers, you may refer to Avago Optoisolation Products Se-
lection 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
14.2mm Stretched SO8 type packages optocouplers
Top view of evaluation board is pictured in Figure 1 and
schematic diagram in Figure 2.
ACNW261L
(400mil DIP8)
ACNT-H61L
(14.2mm Stretched S08)
2
3
8
5
6
Anode
VDD
GND
VO
Shield
1
NC
NC
4
7
VE
Cathode
Anode
VDD
GND
Vo
Shield
NC
NC
NC
Cathode
2
3
8
5
6
1
4
7
2
Figure 2. Schematic Diagram for ACNW261L / ACNT-H61L Evaluation Board
Figure 1. ACNW261L / ACNT-H61L Evaluation Board (Top View)
Work area for
additional
components
Input pin / pad
VDD test point
Output test point
Gnd test points
Output test point
Isolation
LED input resistor
Isolation
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
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 nucle-
ar 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.
Board Connection and Operation
A peaking capacitor (C1–C2, C4–C5) can be placed across
the input current limit resistor (R1–R4) to achieve en-
hanced 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.
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”.
Figure 3. Connection of peaking cap (Cpeak) across input resistor to improve
speed performance
Figure 4. Recommended drive circuit for high CMR
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 per-
formance (Figure 4).
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”.
GND
2
V
DD2
0.1µF
GND
1
R
1
SHIELD
V
in
+
−
C
peak
V
0
R
2
V
DD
GND
2
V
DD2
0.1µF
GND
1
R
2
R
1
Shield
V
O
74LS04 or
any totem-pole
output
logic gate
/
