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ACPL-064L Datasheet(PDF) 13 Page - AVAGO TECHNOLOGIES LIMITED

Part No. ACPL-064L
Description  Ultra Low Power 10 MBd Digital CMOS Optocouplers Low input current: 1.6 mA
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Manufacturer  AVAGO [AVAGO TECHNOLOGIES LIMITED]
Direct Link  http://www.avagotech.com
Logo AVAGO - AVAGO TECHNOLOGIES LIMITED

ACPL-064L Datasheet(HTML) 13 Page - AVAGO TECHNOLOGIES LIMITED

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13
Split LED Bias Resistor for Optimum CMR
Figure 11 shows the recommended drive circuit for the
ACPL-x6xL that gives optimum common-mode rejection.
The two current setting resistors balance the common
mode impedances at the LED’s anode and cathode.
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
is not wanted when the LED should be on) or conversely
cause current to be injected into the LED (which is not
wanted when the LED should be off).
Figure 12 shows the parasitic capacitances (CLA and
CLC) between the LED’s anode and cathode, and output
ground. Also shown in Figure 12 on the input side is an
AC-equivalent circuit.
Table 1 shows the directions of ILP and ILN depend on the
polarity of the common-mode transient. For transients
occurring when the LED is on, common-mode rejection
(CML, since the output is at "low" state) depends on
LED current (IF). For conditions where IF is close to the
switching threshold (ITH), CML also depends on the extent
to which ILP and ILN balance each other. In other words,
any condition where a common-mode transient causes a
momentary decrease in IF (i.e. when dVCM/dt > 0 and |IFP|
> |IFN|, referring to Table 1). will cause a common-mode
failure for transients which are fast enough.
Likewise for a common-mode transient that occurs when
the LED is off (i.e. CMH, since the output is at "high" state),
if an imbalance between ILP and ILN results in a transient
IF equal to or greater than the switching threshold of the
optocoupler, the transient “signal” may cause the output
to spike below 2 V, which constitutes a CMH failure.
The resistors recommended in Figure 11 include both
the output impedance of the logic driver circuit and
the external limiting resistor. The balanced ILED-setting
resistors help equalize the common mode voltage change
at the anode and cathode. This reduces ILED changes
caused by transient coupling through the parasitic capaci-
tors CLA and CLC shown in Figure 12.
For ACPL-M61L/W61L:
VDD = 3.3 V: R1 = 510 Ω ± 1%, R2 = 360 Ω ± 1%
VDD = 5.0 V: R1 = 1000 Ω ± 1%, R2 = 680 Ω ± 1%
RT = R1 + R2 R1/R2 ≈ 1.5
VDD
GND2
VDD2
0.1µF
GND1
R2
R1
Shield
VO
74LS04 or any
totem-pole output
logic gate
Figure 11. Recommended high-CMR drive circuit for the ACPL-x6xL.
For ACPL-064L/K64L:
VDD = 3.3 V: R1 = 430 Ω ± 1%, R2 = 430 Ω ± 1%
VDD = 5.0 V: R1 = 845 Ω ± 1%, R2 = 845 Ω ± 1%
RT = R1 + R2 R1/R2 ≈ 1


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