MAX44280 Ver la hoja de datos (PDF) - Maxim Integrated

Número de pieza

componentes Descripción

Fabricante

MAX44280

1.8V, 50MHz, Low-Offset, Low-Power, Rail-to-Rail I/O Op Amp

Maxim Integrated 

MAX44280

1.8V, 50MHz, Low-Offset,

Low-Power, Rail-to-Rail I/O Op Amp

Applications Information

Power-Up Autotrim

The IC features an automatic trim that self-calibrates

the VOS of this device to less than 50FV of input offset

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.

Shutdown Operation

The MAX44280 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

and retains its power-up trim settings. The device also

recovers from shutdown in under 30Fs.

The shutdown logic levels of the device is independent

of supply, allowing the shutdown feature of the device to

operate off of a 1.8V or 3.3V microcontroller, regardless

of supply voltage.

Rail-to-Rail Input/Output

The input voltage range of the IC extends 100mV above

VDD and below VSS. The wide input common-mode

voltage range allows the op amp to be used as a buf-

fer and as a differential amplifier in a wide-variety of

signal processing applications. Output voltage high/low

is designed to be only 50mV above VSS and below VDD

allowing maximum dynamic range in single-supply appli-

cations. The high output current and capacitance drive

capability of the device make it ideal as an ADC driver

and a line driver.

Input Bias Current

The IC features a high-impedance CMOS input stage

and a specialized ESD structure that allows low-input

bias current operation at low-input, common-mode volt-

ages. Low-input bias current is useful when interfacing

with high-ohmic sensors. It is also beneficial for design-

ing transimpedance amplifiers for photodiode sensors.

This makes the device ideal for ground-referenced medi-

cal and industrial sensor applications.

Active Filters

The MAX44280 is ideal for a wide variety of active filter

circuits that makes use of the wide bandwidth, rail-to-rail

input/output stages and high-impedance CMOS inputs.

Driver for Interfacing with

the MAX11645 ADC

The IC’s tiny size and low noise make it a good fit for driv-

ing 12- to 16-bit resolution ADCs in space-constrained

applications. The Typical Application Circuit shows the

MAX44280 amplifier output connected to a lowpass filter

driving the MAX11645 ADC. The MAX11645 is part of a

family of 3V and 5V, 12-bit and 10-bit, 2-channel ADCs.

The MAX11645 offers sample rates up to 94ksps and

measures two single-ended inputs or one differential

input. These ADCs dissipate 670FA at the maximum sam-

pling rate, but just 6FA at 1ksps and 0.5FA in shutdown.

Offered in the ultra-tiny, 1.9mm x 2.2mm WLP and FMAX-

8 packages, the MAX11645 ADCs are an ideal fit to pair

with the MAX44280 amplifier in portable applications.

Where higher resolution is required, refer to the MAX1069

(14-bit) and MAX1169 (16-bit) ADC families.

���������������������������������������������������������������� Maxim Integrated Products  11

Share Link: