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MAX9637

3V/5V Low-Power, Low-Noise, CMOS, Rail-to-Rail I/O Op Amps

Maxim Integrated 

MAX9636/MAX9637/

MAX9638

3V/5V Low-Power, Low-Noise, CMOS,

Rail-to-Rail I/O Op Amps

Detailed Description

The MAX9636/MAX9637/MAX9638 are single-supply,

CMOS input op amps. They feature wide bandwidth at

low quiescent current, making them suitable for a broad

range of battery-powered applications such as portable

medical instruments, portable media players, and smoke

detectors. A combination of extremely low input bias

currents, low input current noise, and low input voltage

noise allows interface to high-impedance sources such

as photodiode and piezoelectric sensors. These devices

are also ideal for general-purpose signal processing func-

tions such as filtering and amplification in a broad range

of portable, battery-powered applications.

The devices’ operational common-mode range extends

0.1V beyond the supply rails, allowing for a wide variety

of single-supply applications.

The ICs also feature low quiescent current and a shut-

down mode that greatly reduces quiescent current while

the device is not operational. This makes the device suit-

able for portable applications where power consumption

must be minimized.

Rail-to-Rail Input Stage

The operational amplifiers have parallel-connected nand

p-channel differential input stages that combine to accept

a common-mode range extending 100mV beyond the

supply rails. The n-channel stage is active for common-

mode input voltages typically greater than (VDD - 1.2V),

and the p-channel stage is active for common-mode input

voltages typically less than (VDD - 1.4V). A small transi-

tion region exists, typically VDD - 1.4 to VDD - 1.2V, during

which both pairs are on.

Rail-to-Rail Output Stage

The maximum output voltage swing is load dependent.

However, it is guaranteed to be within 100mV of the

positive rail even with 3mA of load current. To maximize

the output current sourcing capability, these parts do not

come with built-in short-circuit protection. If loads heavier

than 600Ω must be driven, then ensure that the maximum

allowable power dissipation is not exceeded (see the

Absolute Maximum Ratings section).

Low Input Bias Current

This op-amp family features ultra-low 0.1pA (typ) input

bias current and guaranteed maximum current of ±50pA

over -40°C to +85°C when the input common-mode volt-

age is at midrail. For the -40°C to +85°C temperature

range, the variation in the input bias current is small with

changes in the input voltage due to very high input imped-

ance (in the order of 100GΩ).

Power-Up Time

The ICs typically require a power-up time of 18μs. Supply

settling time depends on the supply voltage, the value

of the bypass capacitor, the output impedance of the

incoming supply, and any lead resistance or inductance

between components. Op amp settling time depends

primarily on the output voltage and is slew-rate limited.

The output settles in approximately 11.5μs for VDD = 3V

and VOUT = VDD/2V (see the Power-Up Time graph in the

Typical Operating Characteristics section).

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