intersil ISL28271, ISL28272 DATA SHEET

®

ISL28271, ISL28272

Data Sheet December 8, 2006

Dual Micropower, Single Supply, Rail-toRail Input and Output (RRIO) Instrumentation Amplifier

The ISL28271 and ISL28272 are dual micropower instrumentation amplifiers (in-amps) optimized for low 2.4V to 5V single supplies.

Both devices feature an Input Range Enhancement Circuit (IREC) which maintains CMRR performance for input voltages equal to the positive and negative supply rails. The input signal is capable of swinging 10% above the positive supply rail and to 100mV below the negative supply with only a slight degradation of the CMRR performance. The output operation is rail to rail.

The ISL28271 is compensated for a minimum gain of 10 or more. For higher gain applications, the ISL28272 is compensated for a minimum gain of 100. The in-amps have CMOS input devices for maximum input common voltage range. The amplifiers can be operated from one lithium cell or two Ni-Cd batteries.

FN6390.0

Features

• 120µA typical supply current for both channels

• 30pA max input bias current

• 100dB CMRR, PSRR

• 0.7µV/°C offset voltage temperature coefficient

• 180kHz 3dB Bandwidth - ISL28271

• 100kHz 3dB Bandwidth - ISL28272

• 0.5V/µs slew rate

• Single supply operation

• Rail-to-rail input and output (RRIO)

• Input is capable of swinging above V+ and below V(ground sensing)

• 0.081%1 typical gain error - ISL28271

• -0.19%1 typical gain error - ISL28272

• Pb-free plus anneal available (RoHS compliant)

Ordering Information

PART NUMBER

(Note)

ISL28271FAZ (Note)

ISL28271FAZ-T7 (Note)

ISL28272FAZ (Note)

ISL28272FAZ-T7 (Note)

NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.

PART

MARKING

28271 FAZ 97/Tube 16 Ld QSOP

28271 FAZ 7”

28272 FAZ 97/Tube 16 Ld QSOP

28272 FAZ 7”

TAPE &

REEL

(1000 pcs)

PACKAGE

(Pb-Free)

(Pb-free) 16 Ld QSOP

(Pb-free)

(Pb-free) 16 Ld QSOP

(Pb-free)

PKG.

DWG. #

MDP0040

Applications

• Battery- or solar-powered systems

• Strain gauge

• Sensor signal conditioning

• Medical devices

• Industrial instrumentations

Pinout

ISL28271, ISL28272

(16 LD QSOP)

TOP VIEW

NC

1

2

OUT_A

3

FB+_A

FB-_A

IN-_A

IN+_A

EN

_A

4

5

6

7

V-

8

-+-+

16

15

14

13

12

11

10

9

V+

OUT_B

FB+_B

FB-_B

IN-_B

IN+_B

EN

_B

NC

1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 1-888-468-3774

| Intersil (and design) is a registered trademark of Intersil Americas Inc.

All other trademarks mentioned are the property of their respective owners.

ISL28271, ISL28272

Absolute Maximum Ratings (T

Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5V

Supply Turn On Voltage Slew Rate . . . . . . . . . . . . . . . . . . . . . 1V/μs

Input Current (IN, FB) ISL28272 . . . . . . . . . . . . . . . . . . . . . . . . 5mA

Differential Input Voltage (IN, FB) ISL28272 . . . . . . . . . . . . . . . 0.5V

Input Current (IN, FB) ISL28271 . . . . . . . . . . . . . . . . . . . . . . . . 5mA

Differential Input (IN, FB) Voltage ISL28271 . . . . . . . . . . . . . . . 1.0V

Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . V-

ESD tolerance, Human Body Model . . . . . . . . . . . . . . . . . . . . . .3kV

= +25°C) Thermal Information

A

Thermal Resistance θ

16 Ld QSOP Package . . . . . . . . . . . . . . . . . . . . . . . 112

Output Short-Circuit Duration . . . . . . . . . . . . . . . . . . . . . . .Indefinite

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

Storage Temperature Range . . . . . . . . . . . . . . . . . .-65°C to +150°C

Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . +125°C

- 0.5V to V+ + 0.5V

(°C/W)

JA

ESD tolerance, Machine Model . . . . . . . . . . . . . . . . . . . . . . . . .300V

CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied .

IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typical values are for information purposes only. Unless otherwise noted, all tests are at the specified temperature and are pulsed tests, therefore: TJ = TC = T

Electrical Specifications V+ = +5V, V- = GND, V

operating temperature range, -40°C to +125°C.

A

= 1/2V+, TA = +25°C, unless otherwise specified. Boldface limits apply over the

FB+

PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT

V

TCV

I

OS

I

e

OS

B

N

OS

Input Offset Voltage ISL28271 -600

-1200

ISL28272 -500

-750

Input Offset Voltage Temperature Coefficient -40°C to +125°C

Input Offset Current between IN+ and IN-, and between FB+ and FB-

Input Bias Current (IN+, IN-, FB+, and FB- terminals)

See graphs for extended temperature range

-40°C to +85°C See graphs for extended temperature range

-40°C to +85°C

-30

-80

-30

-80

Input Noise Voltage ISL28271 f = 0.1Hz to 10Hz 10 µV

ISL28272 6 µV

±35

600

µV

1200

±35 500

µV

750

0.7 µV/°C

±5 30

pA

80

±10 30

pA

80

P-P P-P

Input Noise Voltage Density ISL28271 fo = 1kHz 240 nV/√Hz

ISL28272 78 nV/√Hz

i

N

Input Noise Current Density ISL28271 fo = 1kHz 0.92 pA/√Hz

ISL28272 0.2 pA/√Hz

R

IN

V

IN

CMRR Common Mode Rejection Ratio ISL28271 V

Input Resistance 1GΩ Input Voltage Range V+ = 2.4V to 5.0V 0 V+ V

= 0V to 5V 80

CM

70

ISL28272 80

100 dB

75

PSRR Power Supply Rejection Ratio V+ = 2.4V to 5V 80

100 dB

75

E

G

Gain Error ISL28271 RL = 100kΩ to 2.5V +0.081 %

ISL28272 -0.19

2

FN6390.0

December 8, 2006

ISL28271, ISL28272

Electrical Specifications V+ = +5V, V- = GND, V

operating temperature range, -40°C to +125°C. (Continued)

= 1/2V+, TA = +25°C, unless otherwise specified. Boldface limits apply over the

FB+

PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT

V

OUT

Maximum Voltage Swing Output low, RL = 100kΩ 3630mV

Output low, R

= 1kΩ 130 175

L

225

Output high, R

SR Slew Rate R

-3db BW -3dB Bandwidth R

= 1kΩ to GND 0.4

L

= 10kΩ ISL28271 180 kHz

L

= 100kΩ 4.980

L

= 1kΩ 4.85

L

4.980

4.80

0.35

4.99 V

4.88 V

0.5 0.7

0.75

ISL28272 100 kHz

I

S,EN

I

S,DIS

Supply Current, Enabled Both A and B channels enabled, EN = V- 120 156

200

Supply Current, Disabled Both A and B channels disabled, EN =V+ 4 7

9

V

I

ENH

INH

INL

EN Enable Pin High Level 2 V EN Enable Pin Low Level 0.8 V EN Input Current High EN = V+ 0.8 1

1.3

I

ENL

EN Input Current Low EN = V- 26 50

100

V+ Minimum Supply Voltage 2.4 V

I

SC+

I

SC-

Short Circuit Output Current V+ = 5V, RL = 10Ω 28

25

Short Circuit Output Current V+ = 5V, RL = 10Ω 24

20

31 mA

26 mA

mV

V/µs

µA

nA

3

FN6390.0

December 8, 2006

Typical Performance Curves

ISL28271, ISL28272

70

60

50

40

GAIN (dB)

30

20

10

1 10 100 1k 10k 100k 1M

GAIN = 1000 GAIN = 500

GAIN = 200 GAIN = 100 GAIN = 50

GAIN = 20 GAIN = 10

FREQUENCY (Hz)

VCM = 5V

V

= 10mV

OUT

RL = 10k

PP

FIGURE 1. ISL28271 FREQUENCY RESPONSE vs CLOSED

LOOP GAIN. V+ = V

70

60

50

40

GAIN (dB)

30

20

GAIN = 1000 GAIN = 500

GAIN = 200 GAIN = 100 GAIN = 50

GAIN = 20 GAIN = 10

CM

= 5V

VCM = 2.5V

= 10mV

V

OUT

RL = 10k

PP

90

80

70

60

GAIN (dB)

50

40

30

GAIN = 10,000 GAIN = 5,000

GAIN = 2,000 GAIN = 1,000 GAIN = 500

GAIN = 200 GAIN = 100

1 10 100 1k 10k 100k 1M

FREQUENCY (Hz)

VCM = 5V

= 10mV

V

OUT

RL = 10k

PP

FIGURE 2. ISL28272 FREQUENCY RESPONSE vs CLOSED

LOOP GAIN. V

90

80

70

60

GAIN (dB)

50

40

GAIN = 10,000 GAIN = 5,000

GAIN = 2,000 GAIN = 1,000 GAIN = 500

GAIN = 200 GAIN = 100

CM

= V+

VCM = 2.5V

= 10mV

V

OUT

RL = 10k

PP

10

1 10 100 1k 10k 100k 1M

FREQUENCY (Hz)

FIGURE 3. ISL28271 FREQUENCY RESPONSE vs CLOSED

LOOP GAIN. V+ = 5V, V

70

60

50

40

GAIN (dB)

30

20

10

1 10 100 1k 10k 100k 1M

GAIN = 1000 GAIN = 500

GAIN = 200 GAIN = 100 GAIN = 50

GAIN = 20 GAIN = 10

FREQUENCY (Hz)

CM

= 1/2V+

VCM = +10mV

V

= 10mV

OUT

RL = 10k

PP

FIGURE 5. ISL28271 FREQUENCY RESPONSE vs CLOSED

LOOP GAIN. V+ = 5V, V

CM

= 10mV

30

1 10 100 1k 10k 100k 1M

FREQUENCY (Hz)

FIGURE 4. ISL28272 FREQUENCY RESPONSE vs CLOSED

LOOP GAIN. V

90

80

70

60

GAIN (dB)

50

40

30

GAIN = 10,000 GAIN = 5,000

GAIN = 2,000 GAIN = 1,000 GAIN = 500

GAIN = 200 GAIN = 100

1 10 100 1k 10k 100k 1M

= 1/2V+

CM

FREQUENCY (Hz)

VCM = +10mV

V

= 10mV

OUT

RL = 10k

PP

FIGURE 6. ISL28272 FREQUENCY RESPONSE vs CLOSED

LOOP GAIN. V

CM

= V-

4

FN6390.0

December 8, 2006

Typical Performance Curves (Continued)

25

= 2.4V

S

VS = 5V

20

15

10

GAIN (dB)

AV = 10

= 10kΩ

R

L

= 10pF

C

L

5

R

= 10

F/RG

= 1kΩ

R

F

= 100Ω

R

G

0

10

100 10k1k 100k 1M

FREQUENCY (Hz)

V

ISL28271, ISL28272

45 40 35 30 25 20

GAIN (dB)

15 10

5 0

AV = 100

= 10kΩ

R

L

= 10pF

C

L

R

F/RG

= 10kΩ

R

F

= 100Ω

R

G

10

VS = 5V

V

= 2.4V

S

= 100

100 10k1k 100k 1M

FREQUENCY (Hz)

FIGURE 7. ISL28271 FREQUENCY RESPONSE vs SUPPLY

VOLTAGE

25

820pF

20

220pF

15

GAIN (dB)

AV = 10

= 10kΩ

R

10

C

= 10pF

L

= 10

R

F/RG

= 1kΩ

R

F

R

= 100Ω

G

5

10

100 10k1k 100k 1M

FREQUENCY (Hz)

FIGURE 9. ISL28271 FREQUENCY RESPONSE vs C

90 80

70 60 50 40

AV = 10

30

CMRR (dB)

20 10

0

-10 10 100 1k 10k 100k 1M

FREQUENCY (Hz)

470pF

100pF

LOAD

FIGURE 11. ISL28271 CMRR vs FREQUENCY

FIGURE 8. ISL28272 FREQUENCY RESPONSE vs SUPPLY

VOLTAGE

50

45

40

35

GAIN (dB)

30

25

AV = 100

= 10kΩ

R C

= 10pF

L

R

F/RG

= 10kΩ

R

F

= 100Ω

R

G

10

= 100

100 10k1k 100k 1M

FREQUENCY (Hz)

820pF

FIGURE 10. ISL28272 FREQUENCY RESPONSE vs C

120

100

80

60

CMRR (dB)

AV = 100

40

20

0

10 100 1k 10k 100k

FREQUENCY (Hz)

2200pF 1200pF

56pF

LOAD

1M

FIGURE 12. ISL28272 CMRR vs FREQUENCY

5

FN6390.0

December 8, 2006