Rainbow Electronics MAX9944 User Manual

General Description

The MAX9943/MAX9944 is a family of high-voltage
amplifiers that offers precision, low drift, and low-power
consumption.

The MAX9943 (single) and MAX9944 (dual) op amps
offer 2.4MHz of gain-bandwidth product with only
550µA of supply current per amplifier.

The MAX9943/MAX9944 family has a wide power sup­ply range operating from ±3V to ±19V dual supplies or
a 6V to 38V single supply.

The MAX9943/MAX9944 is ideal for sensor signal condi­tioning, high-performance industrial instrumentation and
loop-powered systems (e.g., 4mA–20mA transmitters).

The MAX9943 is offered in a space-saving 6-pin TDFN or
8-pin µMAX

®

package. The MAX9944 is offered in an
8-pin SO or an 8-pin TDFN package. These devices are
specified over the -40°C to +125°C automotive tempera­ture range.

Applications

Sensor Interfaces

Loop-Powered Systems

Industrial Instrumentation

High-Voltage ATE

High-Performance ADC/DAC Input/Output
Amplifiers

Features

♦ Wide 6V to 38V Supply Range

♦ Low 100µV (max) Input Offset Voltage

♦ Low 0.4µV/°C Offset Drift

♦ Unity Gain Stable with 1nF Load Capacitance

♦ 2.4MHz Gain-Bandwidth Product

♦ 550µA Supply Current

♦ 20mA Output Current

♦ Package Options

3mm x 5mm, 8-Pin µMAX or 3mm x 3mm, 6-Pin

TDFN Packages (Single)

5mm x 6mm, 8-Pin SO or 3mm x 3mm, 8-Pin

TDFN Packages (Dual)

MAX9943/MAX9944

High-Voltage, Precision, Low-Power Op Amps

________________________________________________________________

Maxim Integrated Products

1

19-4433; Rev 1; 4/09

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.

Package Detail

Ordering Information

+

Denotes a lead(Pb)-free/RoHS-compliant package.

*

EP = Exposed pad.

Capacitive Load vs. Resistive Load

µMAX is a registered trademark of Maxim Integrated Products, Inc.

Pin Configurations appear at end of data sheet.

PART TEMP RANGE

MAX9943AUA+ -40°C to +125°C 8 µMAX AACA

MAX9943ATT+ -40°C to +125°C 6 TDFN-EP* AUF

MAX9944ASA+ -40°C to +125°C 8 SO —

MAX9944ATA+ -40°C to +125°C 8 TDFN-EP* BLN

PIN­PACKAGE

MARK

TOP

100,000

MAX9943 toc17

10,000

(pF)

LOAD

C

1000

100

UNSTABLE

STABLE

100 100,000

1000 10,000

R

(Ω)

LOAD

TOP VIEW

1

OUT

2

V

EE

3

IN+

6 TDFN-EP

*EP = EXPOSED PAD.

MAX9943

*EP

TOP VIEW

V

6

CC

5

N.C.

4

IN-

MAX9943/MAX9944

High-Voltage, Precision, Low-Power Op Amps

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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.

Supply Voltage (VCCto VEE) ..................................-0.3V to +40V

All Other Pins (Note 1) .....................(V

EE

- 0.3V) to (VCC+ 0.3V)

OUT Short-Circuit Current Duration

8-Pin µMAX (V

CC

- VEE≤ 20V)...............................................3s

8-Pin µMAX (V

CC

- VEE> 20V) ................................Momentary

6-Pin TDFN (V

CC

- VEE≤ 20V) .............................................60s

6-Pin TDFN (V

CC

- VEE> 20V)...............................................2s

8-Pin SO (V

CC

- VEE≤ 20V) .................................................60s

8-Pin SO (V

CC

- VEE> 20V)...................................................2s

8-Pin TDFN (V

CC

- VEE≤ 20V) .............................................60s

8-Pin TDFN (V

CC

- VEE> 20V)...............................................2s

Continuous Input Current (Any Pins) ................................±20mA

Thermal Limits (Note 2)
Multiple Layer PCB
Continuous Power Dissipation (T

A

= +70°C)

8-Pin µMAX (derate 4.8mW/°C above +70°C) ...........387.8mW

θ

JA

.........................................................................206.3°C/W

θ

JC

..............................................................................42°C/W

6-Pin TDFN-EP (derate 23.8mW/°C above +70°C)..1904.8mW

θ

JA

..............................................................................42°C/W

θ

JC

................................................................................9°C/W

8-Pin SO (derate 7.6mW/°C above +70°C)...................606.1W

θ

JA

............................................................................132°C/W

θ

JC

..............................................................................38°C/W

8-Pin TDFN-EP (derate 24.4mW/°C above +70°C)..1951.2mW

θ

JA

..............................................................................41°C/W

θ

JC

................................................................................8°C/W

Operating Temperature Range .........................-40°C to +125°C

Junction Temperature......................................................+150°C

Lead Temperature (soldering, 10s) .................................+300°C

ELECTRICAL CHARACTERISTICS

(VCC= 15V, VEE= -15V, VCM= 0, RL= 10kΩ to GND, GND = 0, TA= -40°C to +125°C. Typical values are at TA= +25°C, unless oth­erwise noted.) (Note 3)

Note 1: Operation is limited by thermal limits.
Note 2: 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

.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

DC CHARACTERISTICS

Operating Supply Voltage Range V

Quiescent Supply Current per
Amplifier

SUPPLY

I

CC

Power-Supply Rejection Ratio PSRR VS = ±3V to ±19V 105 130 dB

Input Offset Voltage V

Input Offset Voltage Drift TCV

Input Bias Current I

Input Offset Current I

Input Voltage Range V

IN+

OS

OS

BIAS

OS

, V

Common-Mode Rejection Ratio CMRR

Guaranteed by PSRR test ±3 ±19 V

550 950 µA

TA = +25°C 20 100

TA = -40°C to +125°C 240

0.4 µV/°C

VEE + 0.3V ≤ VCM ≤ VCC - 1.8V 4 20

VEE ≤ VCM ≤ VCC - 1.8V 90

VEE ≤ VCM ≤ VCC - 1.8V 1 10 nA

Guaranteed by CMRR test,

IN-

T

= -40°C to +125°C

A

V

EE

VEE + 0.3V ≤ VCM ≤ VCC - 1.8V 105 125

≤ VCM ≤ VCC - 1.8V 105

V

EE

VCC -

1.8

µV

nA

V

dB

MAX9943/MAX9944

High-Voltage, Precision, Low-Power Op Amps

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC= 15V, VEE= -15V, VCM= 0, RL= 10kΩ to GND, GND = 0, TA= -40°C to +125°C. Typical values are at TA= +25°C, unless oth­erwise noted.) (Note 3)

Note 3: All devices are 100% production tested at T

A

= +25°C. Temperature limits are guaranteed by design.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

-13.5V ≤ VO ≤ +13.5V, RL = 10kΩ,
T

= +25°C

A

-13.5V ≤ VO ≤ +13.5V, RL = 10kΩ,
T

= -40°C to +125°C

Open-Loop Gain A

VOL

A

-12V ≤ V
T

A

-12V ≤ V
T

A

≤ +12V, R

O

= +25°C

≤ +12V, R

O

= -40°C to +85°C

= 600Ω,

L

= 600Ω,

L

RL = 10kΩ

V

OH

RL = 600Ω

Output Voltage Swing

TA = +25°C

T

= -40°C to +85°CVCC - 2

A

RL = 10kΩ

V

OL

TA = +25°C

RL = 600Ω

T

= -40°C to +85°C

A

Short-Circuit Current I

SC

TA = +25°C60

TA = -40°C to +125°C 100

AC CHARACTERISTICS

Gain Bandwidth Product GBWP 2.4 MHz
Slew Rate SR -5V ≤ V

Input Voltage Noise Density e

n

f = 1kHz 17.6 nV/√Hz

≤ +5V 0.35 V/µs

OUT

Input Voltage Noise TOTAL NOISE 0.1Hz ≤ f ≤ 10Hz 500 nV

Input Current Noise Density I

Capacitive Loading C

n

LOAD

f = 1kHz 0.18 pA/√Hz

No sustained oscillation 1000 pF

115 130

100

100 110

90

-

V

CC

0.2

V

-

CC

1.8

dB

V

+

EE

V

0.1

V

+

EE

1

V

+

EE

1.1

mA

MAX9943/MAX9944

High-Voltage, Precision, Low-Power Op Amps

4 _______________________________________________________________________________________

Typical Operating Characteristics

(VCC= 15V, VEE= -15V, VCM= 0, RL= 10kΩ to GND, GND = 0, TA= +25°C, unless otherwise noted.)

OFFSET VOLTAGE HISTOGRAM

25

20

15

10

FREQUENCY (%)

5

0

-60 -40 -30-50 -20 -10
OFFSET VOLTAGE (µV)

2010 30 40 50 60

0

MAX9943 toc01

FREQUENCY (%)

SUPPLY CURRENT vs. TEMPERATURE

800

700

600

500

SUPPLY CURRENT (µA)

400

70

60

50

40

30

20

10

0

INPUT VOLTAGE OFFSET

DRIFT HISTOGRAM

-0.3 -0.2

-0.25

-0.1

-0.15
VOS DRIFT (µV/°C)

MAX9943 toc04

-0.05

SUPPLY CURRENT vs. SUPPLY VOLTAGE

700

650

MAX9943 toc02

600

550

500

450

SUPPLY CURRENT (µA)

400

350

0.1

0

0.05

0.15

0.2

0.3

0.25

300

6141810 22 26 30 34 38

SUPPLY VOLTAGE (V)

MAX9943 toc03

OFFSET VOLTAGE vs. SUPPLY VOLTAGE

30

25

20

15

10

OFFSET VOLTAGE (µV)

5

MAX9943 toc05

300

-50 0-25 25 50 75 100 125
TEMPERATURE (°C)

0

61410 18 22 26 30 34 38

SUPPLY VOLTAGE (V)

OFFSET VOLTAGE

vs. COMMON-MODE VOLTAGE

30

25

20

15

10

OFFSET VOLTAGE (µV)

5

0

-14 -2 2-10 -6 6 10 14

COMMON-MODE VOLTAGE (V)

MAX9943 toc06

OFFSET VOLTAGE vs. TEMPERATURE

100

80

60

40

20

OFFSET VOLTAGE (µV)

0

-20

-40

-50 0 25-25 50 75 100 125
TEMPERATURE (°C)

MAX9943 toc07

VOL vs. OUTPUT CURRENT

MAX9943 toc13

OUTPUT VOLTAGE (V)

010515202530

-16

-15

-14

-13

-12

TA = +85°C

TA = +125°C

TA = -40°C

TA = +25°C

OUTPUT CURRENT (mA)

MAX9943/MAX9944

High-Voltage, Precision, Low-Power Op Amps

_______________________________________________________________________________________ 5

Typical Operating Characteristics (continued)

(VCC= 15V, VEE= -15V, VCM= 0, RL= 10kΩ to GND, GND = 0, TA= +25°C, unless otherwise noted.)

INPUT BIAS CURRENT

vs. COMMON-MODE VOLTAGE

3.0

2.5

2.0

1.5

1.0

INPUT BIAS CURRENT (nA)

0.5

0

-14 -2 2-10 -6 6 10 14
COMMON-MODE VOLTAGE (V)

COMMON-MODE REJECTION

RATIO vs. FREQUENCY

140

130

120

110

100

CMRR (dB)

90

80

70

60

0.001 10,000
FREQUENCY (kHz)

3.0

MAX9943 toc08

MAX9943 toc10

10001000.01 0.1 1 10

2.5

2.0

1.5

1.0

INPUT BIAS CURRENT (nA)

0.5

0

160

140

120

100

80

PSRR (dB)

60

40

20

0

0.001 10,000

INPUT BIAS CURRENT
vs. SUPPLY VOLTAGE

61410 18 22 26 30 34 38

SUPPLY VOLTAGE (V)

POWER-SUPPLY REJECTION

RATIO vs. FREQUENCY

FREQUENCY (kHz)

MAX9943 toc09

MAX9943 toc11

10001000.01 0.1 1 10

16

15

14

OUTPUT VOLTAGE (V)

13

12

010515202530

TA = -40°C

TA = +85°C

TA = +125°C

OUTPUT CURRENT (mA)

TA = +25°C

MAX9943 toc12

VOH vs. OUTPUT CURRENT