Ultra-Low-Power, Single-Supply Op Amp + Comparator + Reference

 

Part Number	Replacement	Explanation

Description

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The MAX951–MAX954 feature combinations of a micropower operational amplifier, comparator, and reference in an 8-pin package. In the MAX951 and MAX952, the comparator's inverting input is connected to an internal 1.2V ±2% bandgap reference. The MAX953 and MAX954 are offered without an internal reference. The MAX951/MAX952 operate from a single 2.7V to 7V supply with a typical supply current of 7µA, while the MAX953/MAX954 operate from 2.4V to 7V with a 5µA typical supply current. Both the op amp and comparator feature a common-mode input voltage range that extends from the negative supply rail to within 1.6V of the positive rail, as well as output stages that swing rail-to-rail.

The op amps in the MAX951/MAX953 are internally compensated to be unity-gain stable, while the op amps in the MAX952/MAX954 feature 125kHz typical bandwidth, 66V/ms slew rate, and stability for gains of 10V/V or greater. These op amps have a unique output stage that enables them to operate with an ultra-low supply current while maintaining linearity under loaded conditions. In addition, they have been designed to exhibit good DC characteristics over their entire operating temperature range, minimizing input-referred errors.

The comparator output stage of these devices continuously sources as much as 40mA. The comparators eliminate power-supply glitches that commonly occur when changing logic states, minimizing parasitic feedback and making the devices easier to use. In addition, they contain ±3mV internal hysteresis to ensure clean output switching, even with slow-moving input signals.

MAX951, MAX952, MAX953, MAX954: Typical Operating Circuit Enlarge+

Key Features

• Op Amp + Comparator + Reference in an 8-Pin µMAX® Package (MAX951/MAX952)
• 7µA Typical Supply Current (Op Amp + Comparator + Reference)
• Comparator and Op Amp Input Range Includes Ground
• Outputs Swing Rail-to-Rail
• 2.4V to 7V Supply Voltage Range
• Unity-Gain Stable and 125kHz Decompensated A_V > 10V/V Op Amp Options
• Internal 1.2V ±2% Bandgap Reference
• Internal Comparator Hysteresis
• Op Amp Capable of Driving up to 1000pF Load

Applications/Uses

• Battery-Powered Applications
• Infrared Receivers for Remote Controls
• Instruments, Terminals, and Bar-Code Readers
• Low-Frequency, Local-Area Alarms/Detectors
• Photodiode Preamps
• Smart Cards
• Smoke Detectors and Safety Sensors