MAX44280 查看數據表（PDF） - Maxim Integrated

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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

Detailed Description

The MAX44280 is a high-speed low-power op amp ideal

for signal processing applications due to the device’s

high precision and low-noise CMOS inputs. The device

self-calibrates on power-up to eliminate effects of tem-

perature and power-supply variation.

The MAX44280 also features a low-power shutdown

mode that greatly reduces quiescent current while the

device is not operational and recovers in 30µs.

Crossover Distortion

This op amp features a low-noise integrated charge

pump that creates an internal voltage rail 1V above

VDD, which is used to power the input differential

pair of pMOS transistors as shown in Figure 1. Such

a unique architecture eliminates crossover distor-

tion common in traditional CMOS input architecture

(Figure 2), especially when used in a noninverting

configuration, such as for Sallen-Key filters.

The charge pump’s operating frequency lies well above

the unity-gain frequency of the amplifier. Thanks to its high-

frequency operation and ultra-quiet circuitry, the charge

pump generates little noise, does not require external

components, and is entirely transparent to the user.

INTERNAL

CHARGE

PUMP

STANDARD INPUT STRUCTURE

MAX44280 INPUTS STRUCTURE

Figure 1. Comparing the Input Structure of the MAX44280 to Standard Op-Amp Inputs

CROSSOVER

DISTORTION

MAX44280

TIME

Figure 2. Crossover Distortion of Typical Amplifiers

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