_______________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX9613/MAX9615
Low-Power, High-Efficiency,
Single/Dual, Rail-to-Rail I/O Op Amps
19-5338; Rev 0; 8/10
Typical Application Circuit
General Description
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 pro-
cessing applications such as photodiode transimped-
ance 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 tem-
perature 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 pack-
ages. The MAX9613 features a high-impedance output
while in shutdown.
Applications
Notebooks, Portable Media Players
Industrial and Medical Sensors
General Purpose Signal Processing
Features
S VCC = 1.7V to 5.5V (0°C to +70°C)
S VCC = 1.8V to 5.5V (-40°C to +125°C)
S Low 100µV (max) VOS
S Rail-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
+Denotes lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Ordering Information
2.4kI22kI
10kI
+3.3V
15nF
330pF
3.3nF
SALLEN-KEY FILTER
CORNER FREQUENCY = 10kHz
ADC
MAX9613
MAX11613
PART TEMP
RANGE
PIN-
PACKAGE
TOP
MARK
MAX9613AXT+T -40NC to
+125NC6 SC70 +ADK
MAX9615AXA+T -40NC to
+125NC8 SC70 +AAD
2 ______________________________________________________________________________________
MAX9613/MAX9615
Low-Power, High-Efficiency,
Single/Dual, Rail-to-Rail I/O Op Amps
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.
IN+, IN-, SHDN, VCC to GND..................................-0.3V to +6V
OUT to GND ............................................. -0.3V to (VCC + 0.3V)
Short-Circuit (GND) Duration to Either Supply Rail ................. 5s
Continuous Input Current (any pin) ................................. Q20mA
Thermal Limits (Note 1) Multilayer PCB
Continuous Power Dissipation (TA = +70NC)
6-Pin SC70 (derate 3.1mW/NC above +70NC) .............245mW
BJA .......................................................................326.5NC/W
BJC ..........................................................................115NC/W
8-Pin SC70 (derate 3.1mW/NC above +70NC) .............245mW
BJA ..........................................................................326NC/W
BJC ..........................................................................115NC/W
Operating Temperature Range ........................ -40NC to +125NC
Storage Temperature Range ............................ -65NC to +150NC
Junction Temperature .....................................................+150NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
ELECTRICAL CHARACTERISTICS
(VCC = VSHDN = 3.3V, VIN+ = VIN- = VCM = 0V, RL = 10kI to VCC/2, TA = -40NC to +125NC. Typical values are at TA = +25NC, unless
otherwise noted.) (Note 2)
ABSOLUTE MAXIMUM RATINGS
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.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DC CHARACTERISTICS
Input Voltage Range VIN+, VIN- Guaranteed by CMRR test -0.1 VCC +
0.1 V
Input Offset Voltage VOS
TA = +25NC23 100
FV
TA = -40NC to +125NC after power-up auto-
calibration 150
TA = -40NC to +125NC750
Input Offset Voltage Drift VOS - TC 1 7 FV/NC
Input Bias Current (Note 3) IB
TA = +40°C to +25°C1 1.55
pA
TA = +70°C45
TA = +85°C135
TA = +125°C1.55 nA
Common-Mode Rejection Ratio CMRR
VCM = -0.1V to VCC + 0.1V, TA = +25NC82 100
dB
VCM = -0.1V to VCC + 0.1V, TA = -40NC to
+125NC80
Input Offset Current (Note 3) IOS
TA = +40°C to +25°C0.5
pA
TA = +70°C7
TA = +85°C25
TA = +125°C400
Open-Loop Gain AOL +0.4V P VOUT P VCC - 0.4V, RL = 10kI99 120 dB
Output Short-Circuit Current
(Note 4) ISC To VCC 275 mA
To GND 75
Output Voltage Low VOL
RL = 10kI0.011
V
RL = 600I0.1
RL = 32I0.170
_______________________________________________________________________________________ 3
MAX9613/MAX9615
Low-Power, High-Efficiency,
Single/Dual, Rail-to-Rail I/O Op Amps
ELECTRICAL CHARACTERISTICS (continued)
(VCC = VSHDN = 3.3V, VIN+ = VIN- = VCM = 0V, RL = 10kI to VCC/2, TA = -40NC to +125NC. Typical values are at TA = +25NC, unless
otherwise noted.) (Note 2)
Note 2: All devices are 100% production tested at TA = +25NC. Temperature limits are guaranteed by design.
Note 3: Guaranteed by design, not production tested.
Note 4: Do not exceed package thermal dissipation in the Absolute Maximum Ratings section.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Output Voltage High VOH
RL = 10kIVCC -
0.011
V
RL = 600IVCC -
0.1
RL = 32IVCC -
0.560
AC CHARACTERISTICS
Input Voltage Noise Density enf = 10kHz 28 nV/√Hz
Input Voltage Noise Total noise 0.1Hz P f P 10Hz 5FVP-P
Input Current Noise Density Inf = 10kHz 0.1 fA/√Hz
Gain Bandwidth GBW 2.8 MHz
Slew Rate SR 1.3 V/Fs
Capacitive Loading CLOAD No sustained oscillation 200 pF
Total Harmonic Distortion THD f = 10kHz, VOUT = 2VP-P, AV = 1V/V 85 dB
POWER-SUPPLY CHARACTERISTICS
Power-Supply Range VCC Guaranteed by PSRR 1.8 5.5 V
TA = 0NC to +70NC, guaranteed by PSSR 1.7 5.5
Power-Supply Rejection Ratio PSRR TA = +25NC85 106 dB
TA = -40NC to +125NC83
Quiescent Current ICC Per amplifier, TA = +25NC220 305 FA
Per amplifier 420
Shutdown Supply Current ISHDN MAX9613 only 1 FA
Shutdown Input Low VIL MAX9613 only 0.5 V
Shutdown Input High VIH MAX9613 only 1.4 V
Output Impedance in Shutdown ROUT_SHDN MAX9613 only 10 MI
Turn-On Time from SHDN tON MAX9613 only 20 Fs
Power-Up Time tUP 10 ms
4 ______________________________________________________________________________________
MAX9613/MAX9615
Low-Power, High-Efficiency,
Single/Dual, Rail-to-Rail I/O Op Amps
Typical Operating Characteristics
(VCC = 3.3V, VIN+ = VIN- = 0V, VCM = VCC/2, RL = 10kI to VCC/2, values are at TA = +25NC, unless otherwise noted.)
INPUT BIAS CURRENT vs.
COMMON-MODE VOLTAGE
MAX9613 toc07
COMMON-MODE VOLTAGE (V)
INPUT BIAS CURRENT (pA)
3.53.02.0 2.51.0 1.50.5
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1.0
-1.0
0 4.0
TA = +25°C
INPUT BIAS CURRENT
vs. TEMPERATURE
MAX9613 toc08
TEMPERATURE (°C)
INPUT BIAS CURRENT (pA)
1007550250-25
0.1
1
10
100
0.01
-50 125
VCM = 0V
POWER-UP TRANSIENT
MAX9613 toc09
VOUT
200mV/div
VCC
2V/div
GND
GND
4ms/div
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX9613 toc04
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
6.05.55.04.54.03.53.02.52.0
50
100
150
200
250
300
0
1.5 6.5
RLOAD = NO LOAD
SUPPLY CURRENT vs. TEMPERATURE
MAX9613 toc05
TEMPERATURE (°C)
100
7550250-25-50 125
SUPPLY CURRENT (µA)
50
100
150
200
250
300
0
RLOAD = NO LOAD
INPUT BIAS CURRENT
vs. COMMON-MODE VOLTAGE
MAX9613 toc06
COMMON-MODE VOLTAGE (V)
INPUT BIAS CURRENT (pA)
2.52.01.51.00.5
0.1
1
10
100
1000
10,000
0.01
0 3.0
TA = +125°C
TA = +85°C
TA = +25°C
TA = -40°C TA = 0°C
OFFSET VOLTAGE vs. COMMON-MODE
VOLTAGE vs. TEMPERATURE
MAX9613 toc01
COMMON-MODE VOLTAGE (V)
OFFSET VOLTAGE (µV)
3.0 3.52.52.01.51.00.50
-150
-100
-50
0
50
100
150
-200
-0.5 4.0
TA = -40°C
TA = +25°C
TA = +85°C
TA = +125°C
OFFSET VOLTAGE vs. SUPPLY VOLTAGE
MAX9613 toc02
SUPPLY VOLTAGE (V)
OFFSET VOLTAGE (µV)
5.04.54.03.53.02.52.0
10
20
30
40
50
60
0
1.5 5.5
OFFSET VOLTAGE HISTOGRAM
MAX9613 toc03
OFFSET VOLTAGE (µV)
OCCURANCE (%)
504010 20 30
5
10
15
20
25
30
35
40
0
0 60
_______________________________________________________________________________________ 5
MAX9613/MAX9615
Low-Power, High-Efficiency,
Single/Dual, Rail-to-Rail I/O Op Amps
Typical Operating Characteristics (continued)
(VCC = 3.3V, VIN+ = VIN- = 0V, VCM = VCC/2, RL = 10kI to VCC/2, values are at TA = +25NC, unless otherwise noted.)
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
MAX9613 toc10
FREQUENCY (kHz)
COMMON-MODE REJECTION RATIO (dB)
10001001010.10.01
20
40
60
80
100
120
0
0.001 10,000
INPUT VOLTAGE NOISE vs. FREQUENCY
MAX9613 toc11
FREQUENCY (Hz)
INPUT VOLTAGE NOISE (nV/√Hz)
10k1k
10
20
30
40
50
60
70
80
90
100
0
100 100k
INPUT CURRENT NOISE vs. FREQUENCY
MAX9613 toc12
FREQUENCY (Hz)
INPUT CURRENT NOISE (fA/√Hz)
10k1k100
0.05
0.10
0.15
0.20
0.25
0.30
0
10 100k
RECOVERY FROM SHUTDOWN
MAX9613 toc13
VOUT
200mV/div
VCC
2V/div
GND
GND
10µs/div
TOTAL HARMONIC DISTORTION
MAX9613 toc14
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION (dB)
10k1k100
-110
-100
-90
-80
-70
-60
-120
10 100k
VIN = 2VP-P
AV = 1V/V
TOTAL HARMONIC DISTORTION
PLUS NOISE
MAX9613 toc15
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION PLUS NOISE (dB)
10k1k100
-100
-80
-60
-40
-20
0
-120
10 100k
VIN = 2VP-P
AV = 1V/V
OUTPUT HIGH VOLTAGE
vs. OUTPUT SOURCE CURRENT
MAX9613 toc16
OUTPUT SOURCE CURRENT (mA)
OUTPUT HIGH VOLTAGE (V)
252015105
2.5
2.6
2.7
2.8
2.9
3.0
3.1
3.2
3.3
3.4
2.4
0 30
TA = -40°C
TA = +25°C
TA = +85°C
TA = +125°C
OUTPUT LOW VOLTAGE
vs. OUTPUT SINK CURRENT
MAX9613-15 toc17
OUTPUT SINK CURRENT (mA)
OUTPUT LOW VOLTAGE (V)
252015105
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
0.18
0
0 30
TA = +125°C
TA = +85°C
TA = -40°C
TA = +25°C
0.1Hz TO 10Hz NOISE
MAX9613 toc18
VOUT
1µV/div
10s/div
6 ______________________________________________________________________________________
MAX9613/MAX9615
Low-Power, High-Efficiency,
Single/Dual, Rail-to-Rail I/O Op Amps
Typical Operating Characteristics (continued)
(VCC = 3.3V, VIN+ = VIN- = 0V, VCM = VCC/2, RL = 10kI to VCC/2, values are at TA = +25NC, unless otherwise noted.)
OPEN-LOOP GAIN vs. FREQUENCY
MAX9613 toc19
FREQUENCY (kHz)
OPEN-LOOP GAIN (dB)
10001001010.10.01
20
40
60
80
100
120
0
0.001 10,000
STABILITY vs. CAPACITIVE AND
RESISTIVE LOAD IN PARALLEL
MAX9613 toc20
CAPACITIVE LOAD (pF)
RESISTIVE LOAD (kI)
900800700600500400300200100
2
4
6
8
10
12
14
0
0 1000
UNSTABLE
STABLE
STABILITY vs. CAPACITANCE WITH
SERIES ISOLATION RESISTOR
MAX9613 toc21
CAPACITIVE LOAD (pF)
ISOLATION RESISTOR (I)
1000800200 400 600
10
20
30
40
50
60
70
80
0
0 1200
UNSTABLE
STABLE
100mV STEP RESPONSE
CLOAD = 200pF
MAX9613 toc22
VOUT
50mV/div
VIN
50mV/div
GND
GND
1µs/div
2V STEP RESPONSE
CLOAD = 200pF
MAX9613 toc23
VOUT
1V/div
VIN
1V/div
GND
GND
4µs/div
RECOVERY FROM SATURATION
OUTPUT SATURATED TO GND
MAX9613 toc24
VOUT
500mV/div
VIN
50mV/div
GND
GND
10µs/div
AV = 10V/V
_______________________________________________________________________________________ 7
MAX9613/MAX9615
Low-Power, High-Efficiency,
Single/Dual, Rail-to-Rail I/O Op Amps
Pin Description
Pin Configuration
Typical Operating Characteristics (continued)
(VCC = 3.3V, VIN+ = VIN- = 0V, VCM = VCC/2, RL = 10kI to VCC/2, values are at TA = +25NC, unless otherwise noted.)
RECOVERY FROM SATURATION
OUTPUT SATURATED TO VCC
MAX9613 toc25
VOUT
1V/div
VIN
1V/div
GND
GND
10µs/div
AV = 10V/V
OUTPUT IMPEDANCE vs. FREQUENCY
MAX9613 toc26
FREQUENCY (kHz)
RESISTANCE (I)
10001001010.1
5
10
15
20
25
0
0 10,000
6 SC70
TOP VIEW
NOT TO SCALE
MAX9613
IN-
1
2
GND
IN+
3OUT
6
5
VCC
SHDN
4
+
8 SC70
MAX9615
INA+
INA-
OUTA
INB-
INB+
VCC
OUTB
8
7
6
5
1
2
3
GND 4
+
PIN NAME FUNCTION
MAX9613 MAX9615
1 — IN+ Positive Input
— 3 INA+ Positive Input A
— 5 INB+ Positive Input B
2 4 GND Ground
3 — IN- Negative Input
— 2 INA- Negative Input A
— 6 INB- Negative Input B
4 — OUT Output
— 1 OUTA Output A
— 7 OUTB Output B
5 — SHDN Active-Low Shutdown
6 8 VCC Positive Power Supply. Bypass with a 0.1FF capacitor to ground.
8 ______________________________________________________________________________________
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 VCC 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
_______________________________________________________________________________________ 9
MAX9613/MAX9615
Low-Power, High-Efficiency,
Single/Dual, Rail-to-Rail I/O Op Amps
Figure 3. Autotrim Timing Diagram
Applications Information
Power-Up Autotrim
The MAX9613/MAX9615 feature an automatic autotrim
that self-calibrates the VOS of these devices to less than
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 self-
calibration 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.
Shutdown Operation
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 mul-
tiple 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.
Rail-to-Rail Input/Output
The input voltage range of the MAX9613/MAX9615
extends 100mV above VCC and below ground. The wide
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 con-
verters (ADCs) such as the MAX11613. See the Typical
Application Circuit. The MAX11613 is a low-power,
12-bit I2C ADC that measures either four single-ended
or two differential channels in an 8-pin FMAX® pack-
age. Operating from a single 3V or 3.3V supply, the
MAX11613 draws a low 380FA supply current when sam-
pling at 10ksps. The MAX11613 family also offers pin-
compatible 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 low-
distortion noninverting buffer, while its high bandwidth
gives excellent stopband attenuation above its corner
frequency. See the Typical Application Circuit.
Chip Information
PROCESS: BiCMOS
µMAX is a registerred trademark of Maxim Integrated Products, Inc.
TIME FOR POWER
SUPPLY TO SETTLE
5V
0.5V
0V
0V 0.4
ms
10ms
2V
VCC
VOUT AUTOTRIM SEQUENCE
CALIBRATED
AMPLIFIER
ACTIVE
10 _____________________________________________________________________________________
MAX9613/MAX9615
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.
PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO.
6 SC70 X6SN-1 21-0077 90-0189
8 SC70 X8SN-1 21-0460 90-0348
SC70, 6L.EPS
______________________________________________________________________________________ 11
MAX9613/MAX9615
Low-Power, High-Efficiency,
Single/Dual, Rail-to-Rail I/O Op Amps
Package Information (continued)
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.
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.
12 Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2010 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
MAX9613/MAX9615
Low-Power, High-Efficiency,
Single/Dual, Rail-to-Rail I/O Op Amps
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 8/10 Initial release —
