19-5338; Rev 0; 8/10
Low-Power, High-Efficiency,
Single/Dual, Rail-to-Rail I/O Op Amps
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 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
S VCC = 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
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
Ordering Information
PART
MAX9613AXT+T
MAX9615AXA+T
+Denotes lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
TEMP
RANGE
-40NC to
+125NC
-40NC to
+125NC
PINPACKAGE
6 SC70 +ADK
8 SC70 +AAD
TOP
MARK
MAX9613/MAX9615
Typical Application Circuit
15nF
+3.3V
2.4kI 22kI
330pF
MAX9613
CORNER FREQUENCY = 10kHz
_______________________________________________________________ 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.
10kI
3.3nF
SALLEN-KEY FILTER
ADC
MAX11613
Low-Power, High-Efficiency,
Single/Dual, Rail-to-Rail I/O Op Amps
ABSOLUTE MAXIMUM RATINGS
IN+, IN-, SHDN, VCC to GND.................................. -0.3V to +6V
OUT to GND ............................................. -0.3V to (V
Short-Circuit (GND) Duration to Either Supply Rail ................. 5s
Continuous Input Current (any pin) ................................. Q20mA
Thermal Limits (Note 1) Multilayer PCB
Continuous Power Dissipation (T
6-Pin SC70 (derate 3.1mW/NC above +70NC) .............245mW
B
.......................................................................326.5NC/W
JA
B
..........................................................................115NC/W
JC
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 Range V
Input Offset Voltage V
Input Offset Voltage Drift V
Input Bias Current (Note 3) I
Common-Mode Rejection Ratio CMRR
Input Offset Current (Note 3) I
Open-Loop Gain A
Output Short-Circuit Current
(Note 4)
Output Voltage Low V
SHDN =
3.3V, V
IN+
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
= +70NC)
A
= V
= VCM = 0V, RL = 10kI to VCC/2, TA = -40NC to +125NC. Typical values are at TA = +25NC, unless
IN-
, V
IN+
IN-
OS
- TC 1 7
OS
B
OS
OL
I
SC
OL
+ 0.3V)
CC
Guaranteed by CMRR test -0.1
TA = +25NC
T
= -40NC to +125NC after power-up auto-
A
calibration
T
= -40NC to +125NC
A
TA = +40°C to +25°C
TA = +70°C
T
= +85°C
A
T
= +125°C
A
V
= -0.1V to VCC + 0.1V, TA = +25NC
CM
V
= -0.1V to VCC + 0.1V, TA = -40NC to
CM
+125NC
TA = +40°C to +25°C
T
= +70°C
A
T
= +85°C
A
T
= +125°C
A
+0.4V P V
To V
CC
To GND 75
RL = 10kI
= 600I
R
L
R
= 32I
L
P VCC - 0.4V, RL = 10kI
OUT
8-Pin SC70 (derate 3.1mW/NC above +70NC) .............245mW
B
JA ..........................................................................
B
..........................................................................115NC/W
JC
Operating Temperature Range ........................ -40NC to +125NC
Storage Temperature Range ............................ -65NC to +150NC
Junction Temperature .....................................................+150NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
+
V
CC
0.1
23 100
150
750
1 1.55
45
135
1.55 nA
82 100
80
0.5
7
25
400
99 120 dB
275
0.011
0.1
0.170
326NC/W
V
FV
FV/NC
pA
dB
pA
mA
V
2 ______________________________________________________________________________________
Low-Power, High-Efficiency,
Single/Dual, Rail-to-Rail I/O Op Amps
ELECTRICAL CHARACTERISTICS (continued)
(VCC = V
otherwise noted.) (Note 2)
Output Voltage High V
AC CHARACTERISTICS
Input Voltage Noise Density e
Input Voltage Noise Total noise
Input Current Noise Density I
Gain Bandwidth GBW 2.8 MHz
Slew Rate SR 1.3
Capacitive Loading C
Total Harmonic Distortion THD f = 10kHz, V
POWER-SUPPLY CHARACTERISTICS
Power-Supply Range V
Power-Supply Rejection Ratio PSRR
Quiescent Current I
Shutdown Supply Current
Shutdown Input Low V
Shutdown Input High V
Output Impedance in Shutdown
Turn-On Time from SHDN
Power-Up Time t
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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
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
1.7 5.5
85 106
83
220 305
10 ms
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 = 10kHz 28
0.1Hz P f P 10Hz
f = 10kHz 0.1
No sustained oscillation 200 pF
= 2V
OUT
Guaranteed by PSRR 1.8 5.5
T
= 0NC to +70NC, guaranteed by PSSR
A
T
= +25NC
A
T
= -40NC to +125NC
A
Per amplifier, TA = +25NC
Per amplifier 420
MAX9613 only 1
MAX9613 only 0.5 V
MAX9613 only 1.4 V
MAX9613 only 10
MAX9613 only 20
= +25NC. Temperature limits are guaranteed by design.
A
, AV = 1V/V 85 dB
P-P
nV/√Hz
FV
fA/√Hz
V/Fs
dB
FA
FA
MI
Fs
MAX9613/MAX9615
V
P-P
V
_______________________________________________________________________________________ 3
Low-Power, High-Efficiency,
Single/Dual, Rail-to-Rail I/O Op Amps
Typical Operating Characteristics
(VCC = 3.3V, V
IN+
= V
= 0V, VCM = VCC/2, RL = 10kI to VCC/2, values are at TA = +25NC, unless otherwise noted.)
IN-
OFFSET VOLTAGE vs. COMMON-MODE
VOLTAGE vs. TEMPERATURE
150
100
= -40°C
T
A
50
0
-50
OFFSET VOLTAGE (µV)
-100
-150
-200
MAX9613/MAX9615
-0.5 4.0
COMMON-MODE VOLTAGE (V)
= +25°C
T
A
TA = +85°C
TA = +125°C
3.0 3.52.52.01.51.00.50
MAX9613 toc01
OFFSET VOLTAGE (µV)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
300
R
= NO LOAD
LOAD
250
200
150
100
SUPPLY CURRENT (µA)
50
0
1.5 6.5
SUPPLY VOLTAGE (V)
MAX9613 toc04
SUPPLY CURRENT (µA)
6.05.55.04.54.03.53.02.52.0
OFFSET VOLTAGE vs. SUPPLY VOLTAGE
60
50
40
30
20
10
0
1.5 5.5
SUPPLY VOLTAGE (V)
SUPPLY CURRENT vs. TEMPERATURE
300
R
= NO LOAD
LOAD
250
200
150
100
50
0
TEMPERATURE (°C)
7550250-25-50 125
100
OFFSET VOLTAGE HISTOGRAM
40
35
MAX9613 toc02
30
25
20
15
OCCURANCE (%)
10
5
5.04.54.03.53.02.52.0
0
0 60
OFFSET VOLTAGE (µV)
MAX9613 toc03
504010 20 30
INPUT BIAS CURRENT
vs. COMMON-MODE VOLTAGE
10,000
1000
MAX9613 toc05
100
10
1
INPUT BIAS CURRENT (pA)
0.1
0.01
0 3.0
TA = +125°C
TA = +85°C
TA = -40°C
COMMON-MODE VOLTAGE (V)
TA = +25°C
TA = 0°C
MAX9613 toc06
2.52.01.51.00.5
INPUT BIAS CURRENT vs.
COMMON-MODE VOLTAGE
1.0
TA = +25°C
0.8
0.6
0.4
0.2
0
-0.2
-0.4
INPUT BIAS CURRENT (pA)
-0.6
-0.8
-1.0
0 4.0
COMMON-MODE VOLTAGE (V)
100
MAX9613 toc07
10
1
INPUT BIAS CURRENT (pA)
0.1
3.53.02.0 2.51.0 1.50.5
0.01
-50 125
INPUT BIAS CURRENT
vs. TEMPERATURE
VCM = 0V
TEMPERATURE (°C)
POWER-UP TRANSIENT
MAX9613 toc08
V
OUT
200mV/div
GND
V
CC
2V/div
GND
1007550250-25
4 ______________________________________________________________________________________
MAX9613 toc09
4ms/div
Low-Power, High-Efficiency,
Single/Dual, Rail-to-Rail I/O Op Amps
Typical Operating Characteristics (continued)
(VCC = 3.3V, V
IN+
= V
= 0V, VCM = VCC/2, RL = 10kI to VCC/2, values are at TA = +25NC, unless otherwise noted.)
IN-
MAX9613/MAX9615
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
120
100
80
60
40
20
COMMON-MODE REJECTION RATIO (dB)
0
0.001 10,000
FREQUENCY (kHz)
RECOVERY FROM SHUTDOWN
V
OUT
200mV/div
GND
V
CC
2V/div
GND
10µs/div
10001001010.10.01
MAX9613 toc13
INPUT VOLTAGE NOISE vs. FREQUENCY
100
90
MAX9613 toc10
80
70
60
50
40
30
INPUT VOLTAGE NOISE (nV/√Hz)
20
10
0
100 100k
TOTAL HARMONIC DISTORTION
-60
V
= 2V
IN
P-P
AV = 1V/V
-70
-80
-90
-100
TOTAL HARMONIC DISTORTION (dB)
-110
-120
10 100k
FREQUENCY (Hz)
FREQUENCY (Hz)
INPUT CURRENT NOISE vs. FREQUENCY
0.30
0.25
MAX9613 toc11
0.20
0.15
0.10
INPUT CURRENT NOISE (fA/√Hz)
0.05
10k1k
0
10 100k
FREQUENCY (Hz)
10k1k100
MAX9613 toc12
TOTAL HARMONIC DISTORTION
PLUS NOISE
0
V
= 2V
IN
P-P
AV = 1V/V
-20
MAX9613 toc14
-40
-60
-80
-100
TOTAL HARMONIC DISTORTION PLUS NOISE (dB)
10k1k100
-120
10 100k
FREQUENCY (Hz)
10k1k100
MAX9613 toc15
OUTPUT HIGH VOLTAGE
vs. OUTPUT SOURCE CURRENT
3.4
3.3
3.2
3.1
3.0
2.9
2.8
2.7
OUTPUT HIGH VOLTAGE (V)
2.6
2.5
2.4
0 30
OUTPUT SOURCE CURRENT (mA)
TA = -40°C
TA = +85°C
TA = +125°C
_______________________________________________________________________________________ 5
TA = +25°C
252015105
0.18
0.16
MAX9613 toc16
0.14
0.12
0.10
0.08
0.06
OUTPUT LOW VOLTAGE (V)
0.04
0.02
0
0 30
OUTPUT LOW VOLTAGE
vs. OUTPUT SINK CURRENT
TA = +85°C
TA = +125°C
TA = +25°C
TA = -40°C
OUTPUT SINK CURRENT (mA)
0.1Hz TO 10Hz NOISE
MAX9613-15 toc17
V
OUT
1µV/div
252015105
10s/div
MAX9613 toc18
Low-Power, High-Efficiency,
Single/Dual, Rail-to-Rail I/O Op Amps
Typical Operating Characteristics (continued)
(VCC = 3.3V, V
MAX9613/MAX9615
= V
IN+
= 0V, VCM = VCC/2, RL = 10kI to VCC/2, values are at TA = +25NC, unless otherwise noted.)
IN-
OPEN-LOOP GAIN vs. FREQUENCY
120
100
80
60
40
OPEN-LOOP GAIN (dB)
20
0
0.001 10,000
FREQUENCY (kHz)
STABILITY vs. CAPACITIVE AND
RESISTIVE LOAD IN PARALLEL
14
MAX9613 toc19
10001001010.10.01
12
10
8
6
RESISTIVE LOAD (kI)
4
2
STABLE
0
0 1000
UNSTABLE
CAPACITIVE LOAD (pF)
MAX9613 toc20
900800700600500400300200100
STABILITY vs. CAPACITANCE WITH
SERIES ISOLATION RESISTOR
80
70
60
50
40
30
ISOLATION RESISTOR (I)
20
10
0
0 1200
STABLE
UNSTABLE
CAPACITIVE LOAD (pF)
2V STEP RESPONSE
= 200pF
C
LOAD
V
OUT
1V/div
GND
1000800200 400 600
MAX9613 toc23
100mV STEP RESPONSE
= 200pF
C
LOAD
V
MAX9613 toc21
OUT
50mV/div
GND
V
50mV/div
GND
IN
1µs/div
MAX9613 toc22
RECOVERY FROM SATURATION
V
OUT
500mV/div
GND
OUTPUT SATURATED TO GND
AV = 10V/V
MAX9613 toc24
1V/div
GND
V
IN
4µs/div
V
50mV/div
GND
IN
10µs/div
6 ______________________________________________________________________________________
Low-Power, High-Efficiency,
Single/Dual, Rail-to-Rail I/O Op Amps
Typical Operating Characteristics (continued)
(VCC = 3.3V, V
Pin Configuration
IN+
= V
V
OUT
1V/div
GND
1V/div
GND
= 0V, VCM = VCC/2, RL = 10kI to VCC/2, values are at TA = +25NC, unless otherwise noted.)
IN-
RECOVERY FROM SATURATION
OUTPUT SATURATED TO V
AV = 10V/V
V
IN
10µs/div
CC
MAX9613 toc25
OUTPUT IMPEDANCE vs. FREQUENCY
25
20
15
10
RESISTANCE (I)
5
0
0 10,000
FREQUENCY (kHz)
TOP VIEW
NOT TO SCALE
INA-
INA+
GND
+
1
2
3
4
MAX9615
IN+
GND
IN-
+
1
MAX9613
2
3
6
V
CC
5
SHDN
4
OUT
OUTA
MAX9613 toc26
10001001010.1
V
8
CC
OUTB
7
INB-
6
INB+
5
MAX9613/MAX9615
6 SC70
8 SC70
Pin Description
PIN
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 —
6 8 V
_______________________________________________________________________________________ 7
NAME FUNCTION
SHDN
CC
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.
8 ______________________________________________________________________________________
Low-Power, High-Efficiency,
Single/Dual, Rail-to-Rail I/O Op Amps
Applications Information
Power-Up Autotrim
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.
MAX9613/MAX9615
0V
0.4
ms
10ms
Figure 3. Autotrim Timing Diagram
_______________________________________________________________________________________ 9
Chip Information
PROCESS: BiCMOS
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.
PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO.
6 SC70 X6SN-1
8 SC70 X8SN-1
21-0077 90-0189
21-0460 90-0348
MAX9613/MAX9615
SC70, 6L.EPS
10 _____________________________________________________________________________________
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.
MAX9613/MAX9615
______________________________________________________________________________________ 11
Low-Power, High-Efficiency,
Single/Dual, Rail-to-Rail I/O Op Amps
Revision History
REVISION
NUMBER
0 8/10 Initial 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.
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.
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