MAX4042EUA Maxim Integrated Products, MAX4042EUA Datasheet - Page 9

• Manufacturer Part Number: MAX4042EUA
• Description: IC OPAMP MICROPWR R-TO-R 8-UMAX
• Manufacturer: Maxim Integrated Products

Specifications of MAX4042EUA

• Amplifier Type: General Purpose
• Number Of Circuits: 2
• Output Type: Rail-to-Rail
• Slew Rate: 0.04 V/µs
• Gain Bandwidth Product: 90kHz
• Current - Input Bias: 2nA
• Voltage - Input Offset: 250µV
• Current - Supply: 14µA
• Current - Output / Channel: 2.5mA
• Voltage - Supply, Single/dual (±): 2.4 V ~ 5.5 V, ±1.2 V ~ 2.75 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• -3db Bandwidth: -

Figure 1a. Minimizing Offset Error Due to Input Bias Current
(Noninverting)
Figure 1b. Minimizing Offset Error Due to Input Bias Current
(Inverting)
Figure 2. Input Protection Circuit
R3 = R1
R3 = R1
V
V
IN
IN
R2
R2
IN+
IN-
R3
R1
R3
R1
_______________________________________________________________________________________
Micropower, Rail-to-Rail I/O Op Amps
Single/Dual/Quad, Low-Cost, SOT23,
2.2k
2.2k
R2
R2
MAX4040–
MAX4044
MAX4040–
MAX4044
The MAX4040–MAX4044 family’s inputs are protected
from large differential input voltages by internal 2.2k
series resistors and back-to-back triple-diode stacks
across the inputs (Figure 2). For differential input volt-
ages (much less than 1.8V), input resistance is typically
45M . For differential input voltages greater than 1.8V,
input resistance is around 4.4k , and the input bias
current can be approximated by the following equation:
In the region where the differential input voltage
approaches 1.8V, the input resistance decreases expo-
nentially from 45M
conducting. Conversely, the bias current increases with
the same curve.
The MAX4040–MAX4044 output stage can drive up to a
25k
Figure 3 shows the output voltage swing of a MAX4040
configured as a unity-gain buffer, powered from a single
+4.0V supply voltage. The output for this setup typically
swings from (V
load.
The MAX4040–MAX4044 operate from a single +2.4V to
+5.5V supply (or dual ±1.2V to ±2.75V supplies) and
consume only 10µA of supply current per amplifier. A
high power-supply rejection ratio of 85dB allows the
amplifiers to be powered directly off a decaying battery
voltage, simplifying design and extending battery life.
The MAX4040–MAX4044 typically require 200µs to
power up after V
the output is indeterminant. The application circuit
should allow for this initial delay.
load and still swing to within 60mV of the rails.
I
EE
BIAS
Applications Information
CC
+ 10mV) to (V
Power-Supply Considerations
= (V
to 4.4k
is stable. During this start-up time,
DIFF
Rail-to-Rail Output Stage
Power-Up Settling Time
- 1.8V) / 4.4k
as the diode block begins
CC
- 10mV) with a 100k
9