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 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
MAX9613/MAX9615
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
Ordering Information
PART | TEMP RANGE | PIN- PACKAGE | TOP MARK |
MAX9613AXT+T | -40NC to +125NC | 6 SC70 | +ADK |
MAX9615AXA+T | -40NC to +125NC | 8 SC70 | +AAD |
+Denotes lead(Pb)-free/RoHS-compliant package. T = Tape and reel.
Typical Application Circuit
15nF
+3.3V
2.4kI
22kI
330pF
10kI
ADC
3.3nF
MAX11613
MAX9613
CORNER FREQUENCY = 10kHz
SALLEN-KEY FILTER
Maxim Integrated Products 1
MAX9613/MAX9615
ABSOLUTE MAXIMUM RATINGS
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
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
(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)
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 = +25NC | 23 100 | FV |
TA = -40NC to +125NC after power-up auto- calibration | 150 | |||
TA = -40NC to +125NC | 750 | |||
Input Offset Voltage Drift | VOS - TC | 1 7 | FV/NC | |
Input Bias Current (Note 3) | IB | TA = +40C to +25C | 1 1.55 | pA |
TA = +70C | 45 | |||
TA = +85C | 135 | |||
TA = +125C | 1.55 | nA | ||
Common-Mode Rejection Ratio | CMRR | VCM = -0.1V to VCC + 0.1V, TA = +25NC | 82 100 | dB |
VCM = -0.1V to VCC + 0.1V, TA = -40NC to +125NC | 80 | |||
Input Offset Current (Note 3) | IOS | TA = +40C to +25C | 0.5 | pA |
TA = +70C | 7 | |||
TA = +85C | 25 | |||
TA = +125C | 400 | |||
Open-Loop Gain | AOL | +0.4V P VOUT P VCC - 0.4V, RL = 10kI | 99 120 | dB |
Output Short-Circuit Current (Note 4) | ISC | To VCC | 275 | mA |
To GND | 75 | |||
Output Voltage Low | VOL | RL = 10kI | 0.011 | V |
RL = 600I | 0.1 | |||
RL = 32I | 0.170 |
MAX9613/MAX9615
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)
PARAMETER | SYMBOL | CONDITIONS | MIN TYP MAX | UNITS |
Output Voltage High | VOH | RL = 10kI | VCC - 0.011 | V |
RL = 600I | VCC - 0.1 | |||
RL = 32I | VCC - 0.560 | |||
AC CHARACTERISTICS | ||||
Input Voltage Noise Density | en | f = 10kHz | 28 | nV/√Hz |
Input Voltage Noise | Total noise | 0.1Hz P f P 10Hz | 5 | FVP-P |
Input Current Noise Density | In | f = 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 = +25NC | 85 106 | dB |
TA = -40NC to +125NC | 83 | |||
Quiescent Current | ICC | Per amplifier, TA = +25NC | 220 305 | 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 |
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.
MAX9613/MAX9615
OFFSET VOLTAGE (µV)
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.)
150
100
50
0
-50
-100
-150
-200
OFFSET VOLTAGE vs. COMMON-MODE VOLTAGE vs. TEMPERATURE
TA = +25°C
TA = -40°C
TA = +85°C
TA = +125°C
OFFSET VOLTAGE vs. SUPPLY VOLTAGE
MAX9613 toc01
MAX9613 toc02
60
OFFSET VOLTAGE (µV)
50
40
30
20
10
0
OFFSET VOLTAGE HISTOGRAM
MAX9613 toc03
40
35
OCCURANCE (%)
30
25
20
15
10
5
0
-0.5 0
0.5
1.0
1.5
2.0
2.5
3.0 3.5
4.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
0 10 20 30
40 50 60
300
SUPPLY CURRENT (µA)
250
200
150
100
50
0
COMMON-MODE VOLTAGE (V)
MAX9613 toc04
SUPPLY CURRENT vs. SUPPLY VOLTAGE
RLOAD = NO LOAD
300
SUPPLY CURRENT (µA)
250
200
150
100
50
0
SUPPLY VOLTAGE (V)
SUPPLY CURRENT vs. TEMPERATURE
MAX9613 toc05
RLOAD = NO LOAD | ||||||
10,000
INPUT BIAS CURRENT (pA)
1000
100
10
1
0.1
0.01
OFFSET VOLTAGE (µV)
INPUT BIAS CURRENT
MAX9613 toc06
vs. COMMON-MODE VOLTAGE
TA = +125°C
TA = +85°C
TA = +25°C
TA = -40°C TA = 0°C
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5
-50
-25 0
25 50
75 100
125
0 0.5
1.0
1.5
2.0
2.5
3.0
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
COMMON-MODE VOLTAGE (V)
1.0
0.8
INPUT BIAS CURRENT (pA)
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
INPUT BIAS CURRENT vs. COMMON-MODE VOLTAGE
MAX9613 toc07
TA = +25°C | |||||||
100
INPUT BIAS CURRENT (pA)
10
1
0.1
0.01
INPUT BIAS CURRENT vs. TEMPERATURE
VCM = 0V
MAX9613 toc08
VOUT
200mV/div
GND
VCC
2V/div GND
POWER-UP TRANSIENT
MAX9613 toc09
0 0.5
1.0 1.5
2.0 2.5
3.0
3.5
4.0
-50
-25 0
25 50
75 100
125
4ms/div
COMMON-MODE VOLTAGE (V) TEMPERATURE (°C)
MAX9613/MAX9615
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 (dB)
120
100
80
60
40
20
0
COMMON-MODE REJECTION RATIO vs. FREQUENCY
MAX9613 toc10
100
INPUT VOLTAGE NOISE (nV/√Hz)
90
80
70
60
50
40
30
20
10
0
INPUT VOLTAGE NOISE vs. FREQUENCY
MAX9613 toc11
0.30
INPUT CURRENT NOISE (fA/√Hz)
0.25
0.20
0.15
0.10
0.05
0
MAX9613 toc12
INPUT CURRENT NOISE vs. FREQUENCY
0.001
0.01
0.1 1
10 100
1000 10,000
100 1k
10k
100k
10 100 1k
10k
100k
VOUT
200mV/div
GND
FREQUENCY (kHz)
RECOVERY FROM SHUTDOWN
MAX9613 toc13
-60
TOTAL HARMONIC DISTORTION (dB)
-70
-80
-90
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION
VIN = 2VP-P AV = 1V/V
0
TOTAL HARMONIC DISTORTION PLUS NOISE (dB)
-20
-40
-60
FREQUENCY (Hz)
MAX9613 toc14
MAX9613 toc15
TOTAL HARMONIC DISTORTION PLUS NOISE
VIN = 2VP-P AV = 1V/V
VCC
2V/div GND
10µs/div
-100
-110
-120
10
100
1k FREQUENCY (Hz)
10k
100k
-80
-100
-120
10
100
1k FREQUENCY (Hz)
10k
100k
3.4
3.3
OUTPUT HIGH VOLTAGE (V)
3.2
3.1
3.0
2.9
2.8
2.7
2.6
2.5
2.4
OUTPUT HIGH VOLTAGE vs. OUTPUT SOURCE CURRENT
TA = -40°C
TA = +25°C
TA = +85°C
TA = +125°C
0.18
MAX9613 toc16
0.16
OUTPUT LOW VOLTAGE (V)
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0
OUTPUT LOW VOLTAGE vs. OUTPUT SINK CURRENT
TA = +85°C
TA = +125°C
TA = +25°C
TA = -40°C
VOUT
MAX9613-15 toc17
1µV/div
0.1Hz TO 10Hz NOISE
MAX9613 toc18
0 5 10
15 20
25 30
0 5 10
15 20 25 30
10s/div
OUTPUT SOURCE CURRENT (mA) OUTPUT SINK CURRENT (mA)
MAX9613/MAX9615
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.)
120
OPEN-LOOP GAIN (dB)
100
80
60
40
20
OPEN-LOOP GAIN vs. FREQUENCY
STABILITY vs. CAPACITIVE AND RESISTIVE LOAD IN PARALLEL
MAX9613 toc19
MAX9613 toc20
U | ||||||||||
NSTABLE | ||||||||||
STABLE | ||||||||||
14
12
RESISTIVE LOAD (kI)
10
8
6
4
2
0
0.001
0.01
0.1 1
10 100
1000 10,000
0
0 100 200 300 400 500 600 700 800 900 1000
FREQUENCY (kHz)
CAPACITIVE LOAD (pF)
STABILITY vs. CAPACITANCE WITH SERIES ISOLATION RESISTOR
80
70
ISOLATION RESISTOR (I)
60
50 STABLE
NSTABL
40
VOUT
MAX9613 toc21
50mV/div
GND
100mV STEP RESPONSE CLOAD = 200pF
MAX9613 toc22
30 U E
20
10
0
VIN
50mV/div
GND
0 200 400 600
800
1000
1200
1µs/div
CAPACITIVE LOAD (pF)
2V STEP RESPONSE CLOAD = 200pF
MAX9613 toc23
RECOVERY FROM SATURATION OUTPUT SATURATED TO GND
MAX9613 toc24
VOUT
1V/div
VOUT
AV = 10V/V
500mV/div
GND
GND
VIN
1V/div GND
VIN
50mV/div
GND
4µs/div 10µs/div
MAX9613/MAX9615
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
VOUT
1V/div
OUTPUT SATURATED TO VCC
MAX9613 toc25
OUTPUT IMPEDANCE vs. FREQUENCY
MAX9613 toc26
25
20
GND
VIN
1V/div GND
10µs/div
15
AV = 10V/V
RESISTANCE (I)
10
5
0
0 0.1 1
10 100
1000
10,000
FREQUENCY (kHz)
MAX9615
6 VCC
MAX9613
8 VCC
OUTA 1
Pin Configuration
TOP VIEW NOT TO SCALE
IN+ 1
+
+
GND 2
INA- 2
7 OUTB
INA+ 3
6 INB-
IN- 3
4 OUT
GND 4
5 INB+
6 SC70
8 SC70
5 SHDN
Pin Description
NAME | FUNCTION | ||
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. |
MAX9613 PIN MAX9615
MAX9613/MAX9615
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.
INTERNAL CHARGE PUMP
STANDARD INPUT STRUCTURE
MAX9613/MAX9615 INPUT STRUCTURE
AMPLIFIER OUTPUT
Figure 1. Rail-to-Rail Input Stage Architectures
CROSSOVER DISTORTION
Figure 2. Crossover Distortion When Using Standard Rail-to-Rail Input Stage Architecture. The Input Stage Design Eliminates This Drawback.
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.
MAX9613/MAX9615
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.
CALIBRATED AMPLIFIER ACTIVE
AUTOTRIM SEQUENCE
VOUT
TIME FOR POWER SUPPLY TO SETTLE
5V
VCC
0.5V
0V
2V
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.
0.4 ms
0V
Chip Information
10ms
PROCESS: BiCMOS
Figure 3. Autotrim Timing Diagram
µMAX is a registerred trademark of Maxim Integrated Products, Inc.
Package Information
SC70, 6L.EPS
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 |
MAX9613/MAX9615
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
Revision History
REVISION NUMBER | REVISION DATE | DESCRIPTION | PAGES CHANGED |
0 | 8/10 | Initial release | — |
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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