MAX44260(2011) Ver la hoja de datos (PDF) - Maxim Integrated

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Fabricante

MAX44260
(Rev.:2011)

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

Maxim Integrated 

MAX44260/MAX44261

1.8V 15MHz Low-Offset,

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

Detailed Description

The MAX44260/MAX44261 are high-speed low-power op

amps ideal for signal processing 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 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

MAX44260 INPUTS STRUCTURE

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

CROSSOVER

DISTORTION

MAX44261

TIME

Figure 2. Crossover Distortion of Typical Amplifiers

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