MAX44244/MAX44245/MAX44248
36V, Precision, Low-Power, 90µA,
Single/Quad/Dual Op Amps
Pin Description
PIN
MAX44245
MAX44244
MAX44248
NAME
FUNCTION
SOT23
µMAX
6
SO-14
TSSOP
SO-8
µMAX
1
1
1
11
3
1
11
3
1
4
OUTA
Channel A Output
2
4
4
V
Negative Supply Voltage
Channel A Positive Input
Channel A Negative Input
Positive Supply Voltage
Channel B Positive Input
Channel B Negative Input
Channel B Output
SS
3
3
3
3
INA+
INA-
4
2
2
2
2
2
5
7
4
4
8
8
V
DD
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
5
5
5
5
INB+
INB-
6
6
6
6
7
7
7
7
OUTB
OUTC
INC-
8
8
—
—
—
—
—
—
—
—
—
—
—
—
Channel C Output
9
9
Channel C Negative Input
Channel C Positive Input
Channel D Positive Input
Channel D Negative Input
Channel D Output
10
12
13
14
10
12
13
14
INC+
IND+
IND-
OUTD
No Connection. Not internally
connected.
—
1, 5, 8
—
—
—
—
N.C.
Detailed Description
Applications Information
The MAX44244/MAX44245/MAX44248 are high-precision
amplifiers with less than 2FV (typ) input-referred
offset and low input voltage-noise density at 10Hz.
1/f noise, in fact, is eliminated to improve the performance
in low-frequency applications. These characteristics are
achieved through an auto-zeroing technique that cancels
the input offset voltage and 1/f noise of the amplifier.
The devices feature ultra-high precision operational
amplifiers with a high supply voltage range designed
for load cell, medical instrumentation, and precision
instrument applications.
4–20mA Current-Loop Communication
Industrial environments typically have a large amount of
broadcast electromagnetic interference (EMI) from high-
voltage transients and switching motors. This combined
with long cables for sensor communication leads to
high-voltage noise on communication lines. Current-Loop
communication is resistant to this noise because the EMI
induced current is low. This configuration also allows for
low-power sensor applications to be powered from the
communication lines.
External Noise Suppression in EMI Form
These devices have input EMI filters to prevent effects
of radio frequency interference on the output. The EMI
filters comprise passive devices that present significant
higher impedance to higher frequency signals. See the
EMIRR vs. Frequency graph in the Typical Operating
Characteristics section for details.
The Typical Operating Circuit shows how the device can
be used to make a current loop driver.
High Supply Voltage Range
The devices feature 90µA current consumption per chan-
nel and a voltage supply range from either 2.7V to 36V
single supply or 1.35V to 18V split supply.
The circuit uses low-power components such as the
MAX44244 op amp, the 16-bit MAX5216 DAC, and the
high-precision 60µA-only MAX6033 reference. In this
Maxim Integrated
11
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