MAX44261 Maxim, MAX44261 Datasheet - Page 11

• Manufacturer Part Number: MAX44261
• Description: The MAX44260/MAX44261 offer a unique combination of high speed, precision, low noise, and low-voltage operation making them ideally suited for a large number of signal processing functions such as filtering and amplification of signals in portable an
• Manufacturer: Maxim

The ICs feature an automatic trim that self-calibrates the
V
voltage on power-up. This self-calibration feature allows
the device to eliminate input offset voltage effects due
to power supply and operating temperature variation
simply by cycling its power. The autotrim sequence takes
approximately 10ms to complete and is triggered by an
internal power-on-reset (POR) circuitry. During this time,
the inputs and outputs are put into high impedance and
left unconnected. The MAX44261 can also be forced into
a self-calibration cycle by pulling the CAL input low for
1μs. This input also puts the part into shutdown mode.
The MAX44260 features an active-low shutdown mode
that puts both inputs and outputs into high impedance
and substantially lowers the quiescent current to less
than 1FA. Putting the output into high impedance allows
multiple outputs to be multiplexed onto a single output
line without the additional external buffers. The device
does not self-calibrate when exiting shutdown mode
Figure 3. CAL vs. SHDN Input Operation.
OS
of these devices to less than 50FV of input offset
Applications Information
________________________________________________________________ Maxim Integrated Products 11
Shutdown Operation
V
SHDN
MAX44260
MAX44261
Power-Up Autotrim
OUTPUT
OUTPUT
Low-Power, Rail-to-Rail I/O Op Amps
V
V
/V
DD
DD
V
CAL
DD
0V
0V
0V
/2
/2
30µs
AUTOTRIM
SEQUENCE
10ms
FAST RECOVERY
AMPLIFIER
ACTIVE
and retains its power-up trim settings.
that the device also recovers from shutdown in under
30Fs.
The MAX44261 features a recalibrate input that acts the
same as the shutdown mode of the MAX44260. However,
when the input is pulled low, the device goes through a
self-calibration sequence again
The shutdown logic levels of the devices are indepen-
dent of supply, allowing the shutdown feature of the
device to operate off of a 1.8V or 3.3V microcontroller,
regardless of supply voltage.
The input voltage range of the ICs extends 100mV
above V
mode voltage range allows the op amp to be used as
a buffer and as a differential amplifier in a wide-variety
of signal processing applications. Output voltage high/
low is designed to be only 50mV above V
V
applications. The high output current and capacitance
drive capability of the devices make them ideal as an
ADC driver and a line driver.
1.8V 15MHz Low-Offset,
DD
allowing maximum dynamic range in single-supply
MAX44260/MAX44261
DD
and below V
RECALIBRATED
AMPLIFIER
ACTIVE
Rail-to-Rail Input/Output
SS
. The wide input common-
(Figure
3).
Figure 3
SS
and below
shows