ACPL-782T-300E Avago Technologies US Inc., ACPL-782T-300E Datasheet - Page 18

• Manufacturer Part Number: ACPL-782T-300E
• Description: OPTO AMP ISOLATION AUTO 8-SMD GW
• Manufacturer: Avago Technologies US Inc.
• Series: R²Coupler™r

Specifications of ACPL-782T-300E

• Amplifier Type: Isolation
• Number Of Circuits: 1
• Output Type: Differential
• -3db Bandwidth: 100kHz
• Voltage - Input Offset: 300µV
• Current - Supply: 10.86mA
• Current - Output / Channel: 18.6mA
• Voltage - Supply, Single/dual (±): 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SMD Gull Wing
• No. Of Amplifiers: 1
• Isolation Voltage: 891V
• Gain Non-linearity Max: 2%
• Slew Rate: 1500V/µs
• Amplifier Case Style: DIP
• Input Offset Voltage: 300µV
• Bandwidth: 100kHz
• Supply Current: 10.86mA
• Supply Voltage Range: 4.5V To 5.5V
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Gain Bandwidth Product: -
• Current - Input Bias: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Isolated Temperature Sensing using Thermistor
Thermistor is widely used to measure temperatures in
most systems application. A galvanic isolation between
the potential of the Thermistor and that of the analog-
to-digital is often required when they are mounted in
locations such as high voltage potential, electrically noisy
environments, poorly grounded environments, where
lack of isolation causes either safety or EMI issues.
RL = R1//(R2+R3)=R1(R2+R3)/(R1+R2+R3)
R2 and R3 divides the voltage across RL so that the voltage
fed into ACPL-782T does not exceed +200 mV. The high
impedance characteristic of the input terminals of ACPL-
782T helps in determining those resistors value since one
can select relatively high resistance of R2 and R3 and R1
can be determined easily.
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Avago, Avago Technologies, the A logo and R
Data subject to change. Copyright © 2005-2011 Avago Technologies. All rights reserved.
AV02-1565EN - March 23, 2011
2
Coupler™ are trademarks of Avago Technologies in the United States and other countries.
www.avagotech.com
If R2+R3 >> R1, RL ~ R1
Dividing ratio ~ R3/(R2+R3)
As can be seen from the circuit, one might eliminate R1
and RL~(R2+R3) in this case.
An application example with a Thermistor designed for
measuring IGBT’s surface temperatures is shown in Figure
23. Where TH is the thermistor and the RL is a resistor for
linearization. Suitable RL value is determined from the
Thermistor characteristic and the temperature range to
measure. Please note that the RL value is the compound
value of R1, R2 and R3.