AD8542AR-REEL Analog Devices Inc, AD8542AR-REEL Datasheet - Page 15
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AD8542AR-REEL
Manufacturer Part Number
AD8542AR-REEL
Description
IC,Operational Amplifier,DUAL,CMOS,SOP,8PIN,PLASTIC
Manufacturer
Analog Devices Inc
Datasheet
1.AD8541AKSZ-REEL7.pdf
(20 pages)
Specifications of AD8542AR-REEL
Rohs Status
RoHS non-compliant
Amplifier Type
General Purpose
Number Of Circuits
2
Output Type
Rail-to-Rail
Slew Rate
0.92 V/µs
Gain Bandwidth Product
1MHz
Current - Input Bias
4pA
Voltage - Input Offset
1000µV
Current - Supply
45µA
Current - Output / Channel
30mA
Voltage - Supply, Single/dual (±)
2.7 V ~ 5.5 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
-3db Bandwidth
-
Lead Free Status / RoHS Status
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AD8542AR-REEL7
Manufacturer:
ADI/亚德诺
Quantity:
20 000
PHOTODIODE APPLICATION
The AD854x family has very high impedance with an input bias
current typically around 4 pA. This characteristic allows the
AD854x op amps to be used in photodiode applications and
other applications that require high input impedance. Note that
the AD854x has significant voltage offset that can be removed
by capacitive coupling or software calibration.
Figure 40 illustrates a photodiode or current measurement
application. The feedback resistor is limited to 10 MΩ to avoid
excessive output offset. In addition, a resistor is not needed on
the noninverting input to cancel bias current offset because the
bias current-related output offset is not significant when compared
to the voltage offset contribution. For best performance, follow the
standard high impedance layout techniques, which include the
following:
•
•
•
•
Shielding the circuit.
Cleaning the circuit board.
Putting a trace connected to the noninverting input around
the inverting input.
Using separate analog and digital power supplies.
Rev. F | Page 15 of 20
Figure 40. High Input Impedance Application—Photodiode Amplifier
2.5V
OR
REF
D
2.5V
REF
AD8541/AD8542/AD8544
2
3
100pF
10MΩ
7
R
C
4
V+
AD8541
6
V
OUT