MAXIM MAX9618

19-4753; Rev 1; 9/09
TION KIT
EVALUA BLE
IL
AVA A
High-Efficiency, 1.5MHz
Op Amps with RRIO
Features
The MAX9617/MAX9618 are low-power, zero-drift operational amplifiers, designed for use in portable consumer,
medical, and industrial applications.
S Low 59µA Quiescent Current
S Very-Low 10µV (max) Input Offset Voltage
The MAX9617/MAX9618 feature rail-to-rail CMOS inputs
and outputs, a 1.5MHz GBW at just 59FA supply current
and 10FV (max) zero-drift input offset voltage over time
and temperature. The zero-drift feature of the MAX9617/
MAX9618 reduces the high 1/f noise typically found in
CMOS input operational amplifiers, making it useful for a
wide variety of low-frequency measurement applications.
S Rail-to-Rail Inputs and Outputs
S 1.5MHz GBW
The MAX9617 is available in a space-saving, 2mm x
2mm, 6-pin SC70 package. The MAX9618 is available
in a 2mm x 2mm, 8-pin SC70 package. All devices are
specified over the -40NC to +125NC automotive operating
temperature range.
S Low Input Noise
42nV/√Hz at 1kHz
1µVP-P from 0.1Hz to 10Hz
S Ultra-Low 10pA Input Bias Current
S Single 1.8V to 5.5V Supply Voltage Range
S Unity-Gain Stable
S Available in Tiny 6-Pin SC70 (MAX9617) and 8-Pin
SC70 (MAX9618) Packages
Applications
Sensor Interfaces
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
Loop-Powered Systems
MAX9617AXT+
-40NC to +125NC
6 SC70
Portable Medical Devices
MAX9618AXA+*
-40NC to +125NC
8 SC70
Battery-Powered Devices
+Denotes a lead(Pb)-free/RoHS-compliant package.
Cardiac Monitors
*Future product—contact factory for availability.
Functional Diagrams
TOP VIEW
IN+ 1
MAX9617
6 VDD
INA- 2
+
GND 2
IN- 3
-
5 VDD
INA+ 3
4 OUT
MAX9618
OUTA 1
GND 4
8 VDD
-
7 OUTB
+
-
6 INB-
+
5 INB+
________________________________________________________________ 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.
MAX9617/MAX9618
General Description
MAX9617/MAX9618
High-Efficiency, 1.5MHz
Op Amps with RRIO
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VDD to GND)..................................-0.3V to +6V
All Other Pins, IN+ to IN-..............(GND - 0.3V) to (VDD + 0.3V)
Short-Circuit Duration to Either Supply Rail,
OUT, OUTA, OUTB............................................................. 10s
Continuous Input Current (any pins)................................ ±20mA
Continuous Power Dissipation (TA = +70NC)
6-Pin SC70 (derate 3.1mW/NC above +70NC)...........245.4mW
8-Pin SC70 (derate 3.1mW/NC above +70NC)..............245mW
Operating Temperature Range......................... -40NC to +125NC
Junction Temperature......................................................+150NC
Storage Temperature Range............................. -65NC to +150NC
Lead Temperature (soldering, 10s).................................+300NC
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
(VDD = +3.3V, VGND = 0V, VIN+ = VIN- = VDD/2, RL = 100kI to VDD/2, TA = -40NC to +125NC, unless otherwise noted. Typical values
are at +25NC.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
POWER SUPPLY
Supply Voltage Range
VDD
Supply Current
(per Amplifier)
IDD
Power-Supply Rejection Ratio
(Note 2)
Power-Up Time
PSRR
Guaranteed by PSRR, 0NC P TA P +70NC
1.6
5.5
Guaranteed by PSRR, -40NC P TA P +125NC
1.8
5.5
59
TA = +25NC
VDD = 1.8V to 5.5V
TA = +25NC
119
-40NC P TA P +125NC
107
0NC P TA P +70NC, VDD = 1.6V to 5.5V
tON
78
111
-40NC P TA P +125NC
116
VDD = 0 to 3V step, AV = 1V/V
V
FA
135
dB
135
20
Fs
DC SPECIFICATIONS
Input Offset Voltage (Note 2)
Input Offset Voltage Drift
(Note 2)
Input Bias Current (Note 2)
Input Offset Current
Input Common-Mode Range
Common-Mode Rejection Ratio
(Note 2)
Open-Loop Gain (Note 2)
VOS
0.8
TA = +25NC
DVOS
IB
TA =+25NC
CMRR
AVOL
5
120
0.01
0.14
3.5
-40NC P TA P +125NC
IOS
VCM
10
25
-40NC P TA P +125NC
FV
nV/NC
nA
0.005
Guaranteed by
CMRR test
TA = +25NC
-0.1
VDD +
0.1
-40NC P TA P +125NC
-0.1
VDD +
0.05
-0.1V P VCM P VDD + 0.1V, TA = +25NC
122
-0.1V P VCM P VDD + 0.05V,
-40NC P TA P +125NC
116
20mV P VOUT P VDD - 20mV,
RL = 100kI to VDD/2
120
138
150mV P VOUT P VDD - 150mV,
RL = 5kI to VDD/2
123
160
V
135
dB
dB
2 _______________________________________________________________________________________
High-Efficiency, 1.5MHz
Op Amps with RRIO
(VDD = +3.3V, VGND = 0V, VIN+ = VIN- = VDD/2, RL = 100kI to VDD/2, TA = -40NC to +125NC, unless otherwise noted. Typical values
are at +25NC.) (Note 1)
PARAMETER
SYMBOL
Input Resistance
RIN
CONDITIONS
MIN
TYP
Differential
50
Common mode
200
MAX
MI
12
RL = 100kI to VDD/2
VOH
VDD - VOUT
22
RL = 5kI to VDD/2
50
RL = 600I to VDD/2
Output-Voltage Swing
VOUT
18
RL = 5kI to VDD/2
50
RL = 600I to VDD/2
Short-Circuit Current
mV
11
RL = 100kI to VDD/2
VOL
UNITS
ISC
150
mA
GBWP
1.5
MHz
AC SPECIFICATIONS
Gain-Bandwidth Product
Slew Rate
SR
0V P VOUT P 2V
0.7
V/Fs
Input Voltage-Noise Density
en
f = 1kHz
42
nV/√Hz
FVP-P
Input Voltage Noise
1
0.1Hz P f P 10Hz
Input Current-Noise Density
in
Phase Margin
Capacitive Loading
CL
Crosstalk
f = 1kHz
100
CL = 20pF
60
fA/√Hz
Degrees
No sustained oscillation, AV = 1V/V
400
pF
f = 10kHz (MAX9618)
-100
dB
Note 1: Specifications are 100% tested at TA = +25NC (exceptions noted). All temperature limits are guaranteed by design.
Note 2: Guaranteed by design.
Typical Operating Characteristics
(VDD = +3.3V, VGND = 0V, outputs have RL = 100kI connected to VDD/2. TA = +25NC, unless otherwise specified.)
INPUT OFFSET VOLTAGE
DRIFT HISTOGRAM
OFFSET VOLTAGE HISTOGRAM
15
10
MAX9617 toc02
18
16
FREQUENCY (%)
20
FREQUENCY (%)
20
MAX9617 toc01
25
14
12
10
8
6
5
4
2
0
0
0
1
2
3
OFFSET VOLTAGE (FV)
4
-0.03 -0.02 -0.01
0
0.01 0.02 0.03 0.04
OFFSET VOLTAGE DRIFT (FV/NC)
_______________________________________________________________________________________ 3
MAX9617/MAX9618
ELECTRICAL CHARACTERISTICS (continued)
Typical Operating Characteristics (continued)
(VDD = +3.3V, VGND = 0V, outputs have RL = 100kI connected to VDD/2. TA = +25NC, unless otherwise specified.)
SUPPLY CURRENT
vs. TEMPERATURE
80
TA = +25NC
TA = -40NC
40
5
70
4
60
VOS (FV)
80
60
90
SUPPLY CURRENT (FA)
TA = +125NC
6
MAX9617 toc04
100
SUPPLY CURRENT (FA)
100
MAX9617 toc03
120
INPUT OFFSET VOLTAGE
vs. INPUT COMMON MODE
50
40
TA = +125NC
TA = -40NC
3
TA = +25NC
2
30
20
20
MAX9617 toc05
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
1
10
3.1
3.6
4.1
4.6
5.1
-50
5.6
-25
0
25
50
75
100
SUPPLY VOLTAGE (V)
TEMPERATURE (NC)
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
INPUT BIAS CURRENT
vs. INPUT COMMON MODE
300
MAX9617 toc06
6
250
INPUT BIAS CURRENT (pA)
5
4
3
2
-0.1
125
140
120
150
100
NONINVERTING INPUT
-25
0
25
50
75
100
60
20
INVERTING INPUT
-0.1
125
80
40
0.4
0.9
1.4
1.9
2.4
2.9
0
3.4
0.1
1
10
100
1k
10k 100k 1M 10M
TEMPERATURE (NC)
INPUT COMMON MODE (V)
FREQUENCY (Hz)
COMMON-MODE REJECTION RATIO
vs. TEMPERATURE
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
OUTPUT-VOLTAGE SWING HIGH
vs. TEMPERATURE
120
0.40
120
0.38
0.36
100
80
0.34
VOH (mV)
PSRR (dB)
100
MAX9617 toc11
140
MAX9617 toc09
140
MAX9617 toc10
-50
3.4
100
200
0
0
0.9 1.4 1.9 2.4 2.9
INPUT COMMON MODE (V)
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
50
1
0.4
MAX9617 toc08
2.6
CMRR (dB)
2.1
MAX9617 toc07
1.6
VOS (FV)
0
0
0
CMRR (dB)
MAX9617/MAX9618
High-Efficiency, 1.5MHz
Op Amps with RRIO
80
60
0.32
0.30
0.28
0.26
40
0.24
60
20
40
-50
-25
0
25
50
75
TEMPERATURE (NC)
100
125
0.22
0.20
0
0.1
1
10
100
1k
10k 100k 1M 10M
FREQUENCY (Hz)
-50
-25
0
25
50
75
TEMPERATURE (NC)
4 _______________________________________________________________________________________
100
125
High-Efficiency, 1.5MHz
Op Amps with RRIO
OPEN-LOOP GAIN vs. FREQUENCY
120
0.32
0.30
0.28
0.26
100
80
60
40
20
0.24
0
0.22
-20
0.20
-50
-25
0
25
50
75
100
-40
-10m 100m 1
125
TEMPERATURE (NC)
10,000
INPUT VOLTAGE NOISE (nV/√Hz)
0.34
VOL (mV)
140
OPEN LOOP GAIN (dB)
0.36
MAX9617 toc13
0.38
INPUT VOLTAGE NOISE vs. FREQUENCY
160
MAX9617 toc12
0.40
MAX9617 toc14
OUTPUT-VOLTAGE SWING LOW
vs. TEMPERATURE
1000
100
10
10 100 1k 10k 100k 1M 10M
0.1
1
10
FREQUENCY (Hz)
100
1k
10k
MAX9617/MAX9618
Typical Operating Characteristics (continued)
(VDD = +3.3V, VGND = 0V, outputs have RL = 100kI connected to VDD/2. TA = +25NC, unless otherwise specified.)
100k
FREQUENCY (Hz)
INPUT CURRENT NOISE
vs. FREQUENCY
INPUT VOLTAGE 0.1Hz TO 10Hz NOISE
MAX9617 toc15
0.1FV/div
MAX9617 toc16
INPUT CURRENT NOISE (fA/√Hz)
1000
100
10
0.1
1s/div
1
10
100
1k
10k
FREQUENCY (Hz)
LARGE-SIGNAL GAIN
vs. FREQUENCY
SMALL-SIGNAL GAIN
vs. FREQUENCY
2VP-P
0
LARGE-SIGNAL GAIN (dB)
SMALL-SIGNAL GAIN (dB)
0
-5
-10
-15
-20
-25
MAX9617 toc19
10
MAX9617 toc18
100mVP-P
MAX9617 toc17
5
SMALL-SIGNAL STEP RESPONSE
vs. TIME
100mVP-P
-10
-20
50mV/div
-30
-40
-30
-50
-35
10
100
1k
10k
100k
FREQUENCY (kHz)
1M
10M
10
100
1k
10k
100k
1M
10M
100Fs/div
FREQUENCY (kHz)
_______________________________________________________________________________________ 5
Typical Operating Characteristics (continued)
(VDD = +3.3V, VGND = 0V, outputs have RL = 100kI connected to VDD/2. TA = +25NC, unless otherwise specified.)
LARGE-SIGNAL STEP RESPONSE
vs. TIME
CAPACITIVE LOAD
vs. ISOLATION RESISTOR
MAX9617 toc20
MAX9617 toc21
10,000
100mVP-P
VIN = 100mVP-P
AV = 1V/V
500mV/div
CAPACITENCE (pF)
MAX9617/MAX9618
High-Efficiency, 1.5MHz
Op Amps with RRIO
1000
UNSTABLE
100
0.1
100Fs/div
1
10
100
1000
ISOLATION RESISTOR (I)
Pin Configurations
TOP VIEW
IN+ 1
+
6 VDD
OUTA 1
+
8 VDD
INA- 2
GND 2
MAX9617
IN- 3
5 VDD
INA+ 3
4 OUT
SC70
7 OUTB
MAX9618
GND 4
6 INB5 INB+
SC70
Pin Description
PIN
NAME
FUNCTION
MAX9617
MAX9618
1
—
IN+
Positive Input
2
4
GND
Ground
3
—
IN-
Negative Input
4
—
OUT
Output
5, 6
8
VDD
Positive Supply Voltage. Bypass to GND with a 0.1FF capacitor.
—
1
OUTA
—
2
INA-
Channel A Negative Input
—
3
INA+
Channel A Positive Input
—
5
INB+
Channel B Positive Input
—
6
INB-
Channel B Negative Input
—
7
OUTB
Channel A Output
Channel B Output
6 _______________________________________________________________________________________
High-Efficiency, 1.5MHz
Op Amps with RRIO
+5V
ADC
MAX9617
Figure 1. Typical Application Circuit: Sallen-Key Active Lowpass Filter
Detailed Description
Applications Information
The MAX9617 (single) and MAX9618 (dual) are precision, low-power op amps ideal for signal processing
applications. These devices use an innovative autozero
technique that allows precision and low noise with a
minimum amount of power. The low input offset voltage,
CMOS inputs, and the absence of 1/f noise allows for
optimization of active filter designs.
The MAX9617/MAX9618 low-power, low-noise, and precision operational amplifiers are designed for applications in the portable medical, such as ECG and pulse
oximetry, portable consumer, and industrial markets.
The MAX9617/MAX9618 achieve rail-to-rail performance
at the input through the use of a low-noise charge pump.
This ensures a glitch-free, common-mode input voltage
range extending from the negative supply rail up to
the positive supply rail, eliminating crossover distortion
common to traditional n-channel/p-channel CMOS pair
inputs, reducing harmonic distortion at the output.
Autozero
The MAX9617/MAX9618 feature an autozero circuit that
allows the device to achieve less than 10FV (max) of
input offset voltage and eliminates the 1/f noise.
The MAX9617/MAX9618 are also ideal for loop-powered
systems that interface with pressure sensors or strain
gauges.
Capacitive-Load Stability
Driving large capacitive loads can cause instability in
many op amps. The MAX9617/MAX9618 are stable
with capacitive loads up to 400pF. Stability with higher
capacitive loads can be improved by adding an isolation
resistor in series with the op-amp output. This resistor
improves the circuit’s phase margin by isolating the load
capacitor from the amplifier’s output. The graph in the
Typical Operating Characteristics gives the stable operation region for capacitive load versus isolation resistors.
Power Supplies and Layout
Internal Charge Pump
An internal charge pump provides an internal supply typically 1V beyond the upper rail. This internal rail allows the
MAX9617/MAX9618 to achieve true rail-to-rail inputs and
outputs, while providing excellent common-mode rejection, power-supply rejection ratios, and gain linearity.
The MAX9617/MAX9618 operate either with a single supply from +1.6V to +5.5V with respect to ground or with
dual supplies from Q0.8V to Q2.75V. When used with
dual supplies, bypass both supplies with their own 0.1FF
capacitor to ground. When used with a single supply,
bypass VDD with a 0.1FF capacitor to ground.
The charge pump requires no external components, and
in most applications is entirely transparent to the user.
The operating frequency is well beyond the unity-gain
frequency of the amplifier, avoiding aliasing or other signal integrity issues in sensitive applications.
Careful layout technique helps optimize performance by
decreasing the amount of stray capacitance at the op
amp’s inputs and outputs. To decrease stray capacitance, minimize trace lengths by placing external components close to the op amp’s pins.
Chip Information
PROCESS: BiCMOS
_______________________________________________________________________________________ 7
MAX9617/MAX9618
VIN
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
PACKAGE TYPE
PACKAGE CODE
DOCUMENT NO.
6 SC70
X6SN-1
21-0077
8 SC70
X8C+1
21-0460
SC70, 6L.EPS
MAX9617/MAX9618
High-Efficiency, 1.5MHz
Op Amps with RRIO
8 _______________________________________________________________________________________
High-Efficiency, 1.5MHz
Op Amps with RRIO
_______________________________________________________________________________________ 9
MAX9617/MAX9618
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
High-Efficiency, 1.5MHz
Op Amps with RRIO
MAX9617/MAX9618
Revision History
REVISION
NUMBER
REVISION
DATE
0
7/09
Initial release
1
9/09
Removed references to MAX9617 shutdown functionality
DESCRIPTION
PAGES
CHANGED
—
1, 2, 3, 6, 7
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.
10
© 2009
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.