Datasheet

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MAX9613/MAX9615
Low-Power, High-Efficiency,
Single/Dual, Rail-to-Rail I/O Op Amps
Detailed Description
The MAX9613/MAX9615 are low-power op amps ideal
for signal processing applications due to their high preci-
sion and CMOS inputs.
The MAX9613 also features a low-power shutdown mode
that greatly reduces quiescent current while the device
is not operational.
The MAX9613/MAX9615 self-calibrate on power-up to
eliminate effects of temperature and power-supply variation.
Crossover Distortion
These op amps feature an integrated charge pump that
creates an internal voltage rail 1V above V
CC
that is used
to power the input differential pair of pMOS transistors.
This unique architecture eliminates crossover distortion
common in traditional complementary pair type of input
architecture.
In these op amps, an inherent input offset voltage differ-
ence between the nMOS pair and pMOS pair of transis-
tors causes signal degradation as shown in Figure 1.
By using a single pMOS pair of transistors, this source
of input distortion is eliminated, making these parts
extremely useful in noninverting configurations such as
Sallen-Key filters.
The charge pump requires no external components and
is entirely transparent to the user. See Figure 2.
RF Immunity
The MAX9613/MAX9615 feature robust internal EMI filters
that reduce the devices’ susceptibility to high-frequency
RF signals such as from wireless and mobile devices.
This, combined with excellent DC and AC specifications,
makes these devices ideal for a wide variety of portable
audio and sensitive signal-conditioning applications.
Figure 1. Rail-to-Rail Input Stage Architectures
Figure 2. Crossover Distortion When Using Standard Rail-to-Rail Input Stage Architecture. The Input Stage Design Eliminates This
Drawback.
MAX9613/MAX9615 INPUT STRUCTURE
STANDARD INPUT STRUCTURE
INTERNAL
CHARGE
PUMP
AMPLIFIER OUTPUT
CROSSOVER
DISTORTION