The MAX9613/MAX9615 are low-power precision op amps
with rail-to-rail inputs and rail-to-rail outputs. They feature
precision MOS inputs powered from an internal charge
pump to eliminate crossover distortion that is common
to complementary input-pair type amplifier architectures.
These devices are ideal for a large number of signal processing applications such as photodiode transimpedance amplifiers and filtering/amplification of a wide
variety of signals in industrial equipment. The devices
also feature excellent RF immunity, making them ideal for
portable applications.
The MAX9613/MAX9615 feature a self-calibration system
(on power-up), eliminating the effects of temperature and
power-supply variations.
The MAX9613/MAX9615 are capable of operating from a
1.7V to 5.5V supply voltage over the 0NC to +70NC temperature range, and from 1.8V to 5.5V over the -40NC to
+125NC automotive temperature range.
Both singles and duals are available in tiny SC70 packages. The MAX9613 features a high-impedance output
while in shutdown.
Applications
Notebooks, Portable Media Players
Industrial and Medical Sensors
General Purpose Signal Processing
Features
SVCC = 1.7V to 5.5V (0°C to +70°C)
S
V
= 1.8V to 5.5V (-40°C to +125°C)
CC
S
Low 100µV (max) V
OS
SRail-to-Rail Inputs and Outputs
S
Low 220µA Supply Current, 1µA in Shutdown
S
Autotrim Offset Calibration
S
2.8MHz Bandwidth
S
Excellent RF Immunity
Ordering Information
PART
MAX9613AXT+T
MAX9615AXA+T
+Denotes lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
MAX9613/MAX9615
(VCC = V
otherwise noted.) (Note 2)
DC CHARACTERISTICS
Input Voltage RangeV
Input Offset VoltageV
Input Offset Voltage DriftV
Input Bias Current (Note 3) I
Common-Mode Rejection Ratio CMRR
Input Offset Current (Note 3)I
Open-Loop GainA
Output Short-Circuit Current
(Note 4)
Output Voltage LowV
SHDN=
3.3V, V
IN+
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
= +70NC)
A
= V
= VCM = 0V, RL = 10kI to VCC/2, TA = -40NC to +125NC. Typical values are at TA = +25NC, unless
Input Voltage Noise Densitye
Input Voltage NoiseTotal noise
Input Current Noise DensityI
Gain BandwidthGBW2.8MHz
Slew RateSR1.3
Capacitive LoadingC
Total Harmonic DistortionTHDf = 10kHz, V
POWER-SUPPLY CHARACTERISTICS
Power-Supply RangeV
Power-Supply Rejection RatioPSRR
Quiescent CurrentI
Shutdown Supply Current
Shutdown Input LowV
Shutdown Input HighV
Output Impedance in Shutdown
Turn-On Time from SHDN
Power-Up Timet
Note 2: All devices are 100% production tested at T
Note 3: Guaranteed by design, not production tested.
Note 4: Do not exceed package thermal dissipation in the Absolute Maximum Ratings section.
SHDN=
3.3V, V
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
IN+
= V
= VCM = 0V, RL = 10kI to VCC/2, TA = -40NC to +125NC. Typical values are at TA = +25NC, unless
IN-
V
-
CC
0.011
V
-
CC
0.1
V
-
CC
0.560
5
1.75.5
85106
83
220305
10ms
OH
n
n
LOAD
CC
CC
I
SHDN
IL
IH
R
OUT_SHDN
t
ON
UP
RL = 10kI
= 600I
R
L
= 32I
R
L
f = 10kHz28
0.1Hz P f P 10Hz
f = 10kHz0.1
No sustained oscillation200pF
= 2V
OUT
Guaranteed by PSRR1.85.5
T
= 0NC to +70NC, guaranteed by PSSR
A
T
= +25NC
A
T
= -40NC to +125NC
A
Per amplifier, TA = +25NC
Per amplifier420
MAX9613 only1
MAX9613 only0.5V
MAX9613 only1.4V
MAX9613 only10
MAX9613 only20
= +25NC. Temperature limits are guaranteed by design.
Active-Low Shutdown
Positive Power Supply. Bypass with a 0.1FF capacitor to ground.
Low-Power, High-Efficiency,
MAX9613/MAX9615 INPUT STRUCTURE
STANDARD INPUT STRUCTURE
INTERNAL
CHARGE
PUMP
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 precision 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
to power the input differential pair of pMOS transistors.
This unique architecture eliminates crossover distortion
common in traditional complementary pair type of input
architecture.
MAX9613/MAX9615
that is used
CC
In these op amps, an inherent input offset voltage difference between the nMOS pair and pMOS pair of transistors 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
CROSSOVER
DISTORTION
AMPLIFIER OUTPUT
Figure 2. Crossover Distortion When Using Standard Rail-to-Rail Input Stage Architecture. The Input Stage Design Eliminates This
Drawback.
The MAX9613/MAX9615 feature an automatic autotrim
that self-calibrates the V
100FV of input offset voltage (Figure 3). The autotrim
sequence takes approximately 3ms to complete, and is
triggered by an internal power-on reset (POR) threshold
of 0.5V. During this time, the inputs and outputs are put
into high impedance and left unconnected. This selfcalibration feature allows the device to eliminate input
offset voltage effects due to power supply and operating
temperature variation simply by cycling its power.
If the power supply glitches below the 0.5V threshold,
the POR circuitry reactivates during next power-up.
The MAX9613 features an active-low shutdown mode
that puts both inputs and outputs into a high-impedance
state. In this mode, the quiescent current is less than
1FA. Putting the output in high impedance allows multiple signal outputs to be multiplexed onto a single output
line without the additional external buffers. The device
does not self-calibrate when exiting shutdown mode,
and retains its power-up trim settings. The device also
instantly recovers from shutdown.
The shutdown logic levels of the device are independent
of supply, allowing the shutdown to be operated by
either a 1.8V or 3.3V microcontroller.
TIME FOR POWER
SUPPLY TO SETTLE
5V
V
CC
0.5V
0V
2V
V
OUT
AUTOTRIM SEQUENCE
of these devices to less than
OS
Shutdown Operation
CALIBRATED
AMPLIFIER
ACTIVE
Rail-to-Rail Input/Output
The input voltage range of the MAX9613/MAX9615
extends 100mV above V
and below ground. The wide
CC
input common-mode voltage range allows the op amp to
be used as a buffer and as a differential amplifier in a wide
variety of signal processing applications. Output voltage
low is designed to be especially close to ground—it is
only 11mV above ground, allowing maximum dynamic
range in single-supply applications. High output current
and capacitance drive capability of the part help it to be
useful in ADC driver and line driver applications.
Interfacing with the MAX11613
The MAX9615 dual amplifier’s low power and tiny size
is ideal for driving multichannel analog-to-digital converters (ADCs) such as the MAX11613. See the Typical Application Circuit. The MAX11613 is a low-power,
2
12-bit I
or two differential channels in an 8-pin FMAX
C ADC that measures either four single-ended
®
package. Operating from a single 3V or 3.3V supply, the
MAX11613 draws a low 380FA supply current when sampling at 10ksps. The MAX11613 family also offers pincompatible 5V ADCs (MAX11612) and 8-bit (MAX11601)
and 10-bit (MAX11607) options.
Input Bias Current
The MAX9613/MAX9615 feature a high-impedance
CMOS input stage and a specialized ESD structure
that allows low input bias current operation at low input
common-mode voltages. Low input bias current is
useful when interfacing with high-ohmic sensors. It is
also beneficial for designing transimpedance amplifiers
for photodiode sensors. This makes these MAX9613/
MAX9615 devices ideal for ground referenced medical
and industrial sensor applications.
Active Filters
The MAX9613/MAX9615 are ideal for a wide variety of
active filter circuits that make use of their rail-to-rail input/
output stages and high-impedance CMOS inputs. The
Typical Application Circuit shows an example Sallen-Key
active filter circuit with a corner frequency of 10kHz. At
low frequencies, the amplifier behaves like a simple lowdistortion noninverting buffer, while its high bandwidth
gives excellent stopband attenuation above its corner
frequency. See the Typical Application Circuit.
µMAX is a registerred trademark of Maxim Integrated Products, Inc.
Low-Power, High-Efficiency,
Single/Dual, Rail-to-Rail I/O Op Amps
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the
package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the
package regardless of RoHS status.
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the
package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the
package regardless of RoHS status.
Low-Power, High-Efficiency,
Single/Dual, Rail-to-Rail I/O Op Amps
Revision History
REVISION
NUMBER
08/10Initial release—
REVISION
DATE
MAX9613/MAX9615
DESCRIPTION
PAGES
CHANGED
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.
Maxim reserves the right to change the circuitry and specifications without notice at any time.
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