MAX9615 Maxim, MAX9615 Datasheet - Page 8

• Manufacturer Part Number: MAX9615
• Description: The MAX9613/MAX9615 are low-power precision op amps with rail-to-rail inputs and rail-to-rail outputs
• Manufacturer: Maxim

Low-Power, High-Efficiency,
Single/Dual, Rail-to-Rail I/O Op Amps
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.
These op amps feature an integrated charge pump that
creates an internal voltage rail 1V above V
to power the input differential pair of pMOS transistors.
This unique architecture eliminates crossover distortion
common in traditional complementary pair type of input
architecture.
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.
8
______________________________________________________________________________________
Detailed Description
STANDARD INPUT STRUCTURE
Crossover Distortion
CC
that is used
CROSSOVER
DISTORTION
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.
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.
MAX9613/MAX9615 INPUT STRUCTURE
INTERNAL
CHARGE
PUMP
RF Immunity