MAX44260 查看數據表（PDF） - Maxim Integrated

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MAX44260

1.8V, 15MHz Low-Offset, Low-Power, Rail-to-Rail I/O Op Amps

Maxim Integrated 

MAX44259/MAX44260/

MAX44261/MAX44263

1.8V, 15MHz Low-Offset,

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

Detailed Description

The MAX44259/MAX44260/MAX44261/MAX44263 are

high-speed low-power op amps ideal for signal process-

ing applications due to the device’s high precision and

low-noise CMOS inputs. The devices self-calibrate on

power-up to eliminate effects of temperature and power-

supply variation.

The MAX44260 also features a low-power shutdown

mode that greatly reduces quiescent current while the

device is not operational and recovers in 30µs.

The MAX44261 features a user-selectable self-calibration

input that shuts down the device and allows it to be reca-

librated at any time. The calibration routine takes 10ms.

Crossover Distortion

These op amps feature a low-noise integrated charge

pump that creates an internal voltage rail 1V above

VDD, which is used to power the input differen-

tial 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.

Figure 1

INTERNAL

CHARGE

PUMP

STANDARD INPUT STRUCTURE

MAX44260 INPUTS STRUCTURE

Figure 1. Comparing the Input Structure of the MAX44260 to Standard Op-Amp Inputs

Figure 2

CROSSOVER

DISTORTION

MAX44261

TIME

Figure 2. Crossover Distortion of Typical Amplifiers

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