AD8541AKS-R2 Analog Devices Inc, AD8541AKS-R2 Datasheet - Page 15

• Manufacturer Part Number: AD8541AKS-R2
• Description: IC OPAMP GP R-R CMOS 1MHZ SC70-5
• Manufacturer: Analog Devices Inc

Specifications of AD8541AKS-R2

• Rohs Status: RoHS non-compliant
• Design Resources: Logarithmic Audio Volume Control with Glitch Reduction Using AD5292 (CN0120)
• Amplifier Type: General Purpose
• Number Of Circuits: 1
• 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: SC-70-5, SC-88A, SOT-323-5, SOT-353, 5-TSSOP
• -3db Bandwidth: -

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