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19-4753; Rev 1; 9/09
TION KIT EVALUA BLE ILA AVA
High-Efficiency, 1.5MHz Op Amps with RRIO
Features
S Low 59A Quiescent Current S Very-Low 10V (max) Input Offset Voltage S Low Input Noise 42nV/Hz at 1kHz 1VP-P from 0.1Hz to 10Hz S Rail-to-Rail Inputs and Outputs S 1.5MHz GBW 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
General Description
The MAX9617/MAX9618 are low-power, zero-drift operational amplifiers, designed for use in portable consumer, medical, and industrial applications. 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. 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.
MAX9617/MAX9618
Applications
Sensor Interfaces Loop-Powered Systems Portable Medical Devices Battery-Powered Devices Cardiac Monitors
PART MAX9617AXT+ MAX9618AXA+*
Ordering Information
TEMP RANGE -40NC to +125NC -40NC to +125NC PIN-PACKAGE 6 SC70 8 SC70
+Denotes a lead(Pb)-free/RoHS-compliant package. *Future product--contact factory for availability.
Functional Diagrams
TOP VIEW
MAX9617 MAX9618
IN+ 1
6 VDD
OUTA 1 + INA- 2
8 VDD 7 OUTB + 6 INB5 INB+
+ GND 2 5 VDD
INA+ 3 4 OUT GND 4
IN- 3
_______________________________________________________________ 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.
High-Efficiency, 1.5MHz Op Amps with RRIO MAX9617/MAX9618
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 POWER SUPPLY Supply Voltage Range Supply Current (per Amplifier) Power-Supply Rejection Ratio (Note 2) Power-Up Time DC SPECIFICATIONS Input Offset Voltage (Note 2) Input Offset Voltage Drift (Note 2) Input Bias Current (Note 2) Input Offset Current VOS DVOS IB IOS Guaranteed by CMRR test TA = +25NC -40NC P TA P +125NC -0.1 -0.1 122 116 120 123 138 dB 160 135 dB TA =+25NC -40NC P TA P +125NC 0.005 VDD + 0.1 VDD + 0.05 TA = +25NC -40NC P TA P +125NC 5 0.01 0.8 10 25 120 0.14 3.5 nA FV nV/NC VDD IDD Guaranteed by PSRR, 0NC P TA P +70NC Guaranteed by PSRR, -40NC P TA P +125NC TA = +25NC -40NC P TA P +125NC VDD = 1.8V to 5.5V TA = +25NC -40NC P TA P +125NC 119 107 116 135 20 Fs 135 dB 1.6 1.8 59 5.5 5.5 78 111 V FA SYMBOL CONDITIONS MIN TYP MAX UNITS
PSRR tON
0NC P TA P +70NC, VDD = 1.6V to 5.5V VDD = 0 to 3V step, AV = 1V/V
Input Common-Mode Range
VCM
V
Common-Mode Rejection Ratio (Note 2)
-0.1V P VCM P VDD + 0.1V, TA = +25NC CMRR -0.1V P VCM P VDD + 0.05V, -40NC P TA P +125NC 20mV P VOUT P VDD - 20mV, RL = 100kI to VDD/2 150mV P VOUT P VDD - 150mV, RL = 5kI to VDD/2
Open-Loop Gain (Note 2)
AVOL
2
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High-Efficiency, 1.5MHz Op Amps with RRIO
ELECTRICAL CHARACTERISTICS (continued)
(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 Input Resistance SYMBOL RIN Differential Common mode RL = 100kI to VDD/2 VOH Output-Voltage Swing VOL Short-Circuit Current AC SPECIFICATIONS Gain-Bandwidth Product Slew Rate Input Voltage-Noise Density Input Voltage Noise Input Current-Noise Density Phase Margin Capacitive Loading Crosstalk CL in GBWP SR en 0V P VOUT P 2V f = 1kHz 0.1Hz P f P 10Hz f = 1kHz CL = 20pF No sustained oscillation, AV = 1V/V f = 10kHz (MAX9618) 1.5 0.7 42 1 100 60 400 -100 MHz V/Fs nV/Hz FVP-P fA/Hz Degrees pF dB ISC VOUT VDD - VOUT RL = 5kI to VDD/2 RL = 600I to VDD/2 RL = 100kI to VDD/2 RL = 5kI to VDD/2 RL = 600I to VDD/2 50 150 mA 50 11 18 CONDITIONS MIN TYP 50 200 12 22 mV MAX UNITS MI
MAX9617/MAX9618
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.)
OFFSET VOLTAGE HISTOGRAM
MAX9617 toc01
INPUT OFFSET VOLTAGE DRIFT HISTOGRAM
18 16 FREQUENCY (%) 14 12 10 8 6 4 2 0
MAX9617 toc02
25 20 FREQUENCY (%) 15 10 5 0 0 1 2 3 OFFSET VOLTAGE (FV) 4
20
-0.03 -0.02 -0.01
0
0.01 0.02 0.03 0.04
OFFSET VOLTAGE DRIFT (FV/NC)
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High-Efficiency, 1.5MHz Op Amps with RRIO MAX9617/MAX9618
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. SUPPLY VOLTAGE
MAX9617 toc03
SUPPLY CURRENT vs. TEMPERATURE
90 80 SUPPLY CURRENT (FA) 70 60 50 40 30 20 10 0
MAX9617 toc04
INPUT OFFSET VOLTAGE vs. INPUT COMMON MODE
MAX9617 toc05
120 100 SUPPLY CURRENT (FA) 80 60 40 20 0 1.6 2.1 2.6 3.1 3.6 4.1 4.6 5.1 TA = +25NC TA = -40NC
100
6 5 4 VOS (FV) TA = -40NC 3 TA = +25NC 2 1 0
TA = +125NC
TA = +125NC
5.6
-50
-25
0
25
50
75
100
125
-0.1
0.4
SUPPLY VOLTAGE (V)
TEMPERATURE (NC)
0.9 1.4 1.9 2.4 2.9 INPUT COMMON MODE (V)
3.4
INPUT OFFSET VOLTAGE vs. TEMPERATURE
MAX9617 toc06
INPUT BIAS CURRENT vs. INPUT COMMON MODE
MAX9617 toc07
COMMON-MODE REJECTION RATIO vs. FREQUENCY
120 100 CMRR (dB) 80 60 40 20
MAX9617 toc08
6 5 4 VOS (FV) 3 2 1 0 -50 -25 0 25 50 75 100
300 250 INPUT BIAS CURRENT (pA) 200 150 100 50 0 INVERTING INPUT -0.1 0.4 0.9 1.4 1.9 2.4 2.9 NONINVERTING INPUT
140
125
3.4
0 0.1 1 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
TEMPERATURE (NC)
INPUT COMMON MODE (V)
COMMON-MODE REJECTION RATIO vs. TEMPERATURE
MAX9617 toc09
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
MAX9617 toc10
OUTPUT-VOLTAGE SWING HIGH vs. TEMPERATURE
0.38 0.36 0.34 VOH (mV) 0.32 0.30 0.28 0.26 0.24 0.22 0.20
MAX9617 toc11
140 120 100 80 60
140 120 100
0.40
CMRR (dB)
PSRR (dB)
80 60 40 20
40 -50 -25 0 25 50 75 100 125 TEMPERATURE (NC)
0 0.1 1 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
-50
-25
0
25
50
75
100
125
TEMPERATURE (NC)
4
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High-Efficiency, 1.5MHz Op Amps with RRIO
Typical Operating Characteristics (continued)
(VDD = +3.3V, VGND = 0V, outputs have RL = 100kI connected to VDD/2. TA = +25NC, unless otherwise specified.)
MAX9617/MAX9618
OUTPUT-VOLTAGE SWING LOW vs. TEMPERATURE
MAX9617 toc12
OPEN-LOOP GAIN vs. FREQUENCY
MAX9617 toc13
INPUT VOLTAGE NOISE vs. FREQUENCY
MAX9617 toc14
0.40 0.38 0.36 0.34 VOL (mV) 0.32 0.30 0.28 0.26 0.24 0.22 0.20 -50 -25 0 25 50 75 100
160 140 120 OPEN LOOP GAIN (dB) 100 80 60 40 20 0 -20 -40 -10m 100m 1
10,000 INPUT VOLTAGE NOISE (nV/Hz)
1000
100
10 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) 0.1 1 10 100 1k 10k 100k FREQUENCY (Hz)
125
TEMPERATURE (NC)
INPUT VOLTAGE 0.1Hz TO 10Hz NOISE
MAX9617 toc15
INPUT CURRENT NOISE vs. FREQUENCY
MAX9617 toc16
1000 INPUT CURRENT NOISE (fA/Hz)
0.1FV/div
100
10 1s/div 0.1 1 10 100 1k 10k FREQUENCY (Hz)
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX9617 toc17
LARGE-SIGNAL GAIN vs. FREQUENCY
MAX9617 toc18
SMALL-SIGNAL STEP RESPONSE vs. TIME
MAX9617 toc19
5 0 SMALL-SIGNAL GAIN (dB) -5 -10 -15 -20 -25 -30 -35 10 100 1k 10k 100k
10 2VP-P 0 LARGE-SIGNAL GAIN (dB) -10 -20 -30 -40 -50
100mVP-P
100mVP-P
50mV/div
1M
10M
10
100
1k
10k
100k
1M
10M
100Fs/div
FREQUENCY (kHz)
FREQUENCY (kHz)
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High-Efficiency, 1.5MHz Op Amps with RRIO MAX9617/MAX9618
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
MAX9617 toc20
CAPACITIVE LOAD vs. ISOLATION RESISTOR
VIN = 100mVP-P AV = 1V/V CAPACITENCE (pF)
MAX9617 toc21
100mVP-P
10,000
500mV/div
1000 UNSTABLE
100 100Fs/div 0.1 1 10 100 1000 ISOLATION RESISTOR (I)
Pin Configurations
TOP VIEW
IN+ 1 + 6 VDD OUTA 1 INA- 2 GND 2 MAX9617 5 VDD INA+ 3 4 OUT GND 4 MAX9618 + 8 VDD 7 OUTB 6 INB5 INB+
IN- 3
SC70
SC70
Pin Description
PIN MAX9617 1 2 3 4 5, 6 -- -- -- -- -- -- MAX9618 -- 4 -- -- 8 1 2 3 5 6 7 NAME IN+ GND INOUT VDD OUTA INAINA+ INB+ INBOUTB Positive Input Ground Negative Input Output Positive Supply Voltage. Bypass to GND with a 0.1FF capacitor. Channel A Output Channel A Negative Input Channel A Positive Input Channel B Positive Input Channel B Negative Input Channel B Output FUNCTION
6
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High-Efficiency, 1.5MHz Op Amps with RRIO MAX9617/MAX9618
VIN
+5V
MAX9617
ADC
Figure 1. Typical Application Circuit: Sallen-Key Active Lowpass Filter
Detailed Description
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 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. 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.
Applications Information
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 are also ideal for loop-powered systems that interface with pressure sensors or strain gauges. 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. 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. 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.
Capacitive-Load Stability
Autozero
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 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.
Internal Charge Pump
Power Supplies and Layout
Chip Information
PROCESS: BiCMOS
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High-Efficiency, 1.5MHz Op Amps with RRIO MAX9617/MAX9618
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE 6 SC70 8 SC70 PACKAGE CODE X6SN-1 X8C+1 DOCUMENT NO. 21-0077 21-0460
SC70, 6L.EPS
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High-Efficiency, 1.5MHz Op Amps with RRIO
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
MAX9617/MAX9618
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High-Efficiency, 1.5MHz Op Amps with RRIO MAX9617/MAX9618
Revision History
REVISION NUMBER 0 1 REVISION DATE 7/09 9/09 Initial release 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.
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(c)
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