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

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

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.

MAX9613/MAX9615

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

21-0077

90-0189

8 SC70

X8SN-1

21-0460

90-0348









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.

12 Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

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