intersil ISL28270, ISL28273, ISL28470 DATA SHEET

®

ISL28270, ISL28273, ISL28470

Data Sheet April 13, 2007

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

The ISL28270 and ISL28273 are dual channel micropower
instrumentation amplifiers (in-amps) and the ISL28470 is a
Quad-channel in-amp optimized for low 2.4V to 5V single
supplies.

All three devices feature an Input Range Enhancement
Circuit (IREC) which maintains CMRR performance for input
voltages equal to the positive supply and down to 50mV
above the negative supply rail. The input signal is capable of
swinging above the positive supply rail and to 10mV above
the negative supply with only a slight degradation of the
CMRR performance. The output operation is rail to rail.

The ISL28273 is compensated for a minimum gain of 10 or
more. For higher gain applications, the ISL28270 and
ISL28470 are compensated for a minimum gain of 100. The
in-amps have bipolar input devices for best offset and
excellent 1/f noise performance. The amplifiers can be
operated from one lithium cell or two Ni-Cd batteries.

FN6260.2

Features

• 60µA supply current per channel ISL28270

• 150µV max offset voltage

• 2nA max input bias current ISL28270

• 110dB CMRR, PSRR

• 0.7µV/°C offset voltage temperature coefficient

• 240kHz -3dB bandwidth (G = 100) ISL28270, ISL28470

• 230kHz -3dB bandwidth (G = 10) ISL28273

• 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)

• Output sources and sinks ±29mA load current

• 0.5% gain error

• Pb-free plus anneal available (RoHS compliant)

Ordering Information

PART NUMBER

(Note)

ISL28270IAZ
(Note)

ISL28270IAZ-T13
(Note)

Coming Soon
ISL28273FAZ
(Note)

Coming Soon
ISL28273FAZ-T7
(Note)

ISL28470FAZ
(Note)

ISL28470FAZ-T7
(Note)

ISL28270INEVAL1Z
(Note)

ISL28273INEVAL1Z Evaluation Platform

Coming Soon

ISL28470EVAL1Z

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

28270 IAZ 97/Tube 16 Ld QSOP

28270 IAZ 13”

28273 FAZ 97/Tube 16 Ld QSOP

28273 FAZ 7”

ISL28470FAZ 48/Tube 28 Ld QSOP

ISL28470FAZ 7”

Evaluation Platform

Evaluation Platform

TAPE &

REEL

(1k pcs)

(1k pcs)

(1k pcs)

PACKAGE

(Pb-Free)

(Pb-free)
16 Ld QSOP

(Pb-free)

(Pb-free)

16 Ld QSOP
(Pb-free)

(Pb-free)
28 Ld QSOP

(Pb-free)

PKG.

DWG. #

MDP0040

MDP0040

MDP0040

MDP0040

M28.15

M28.15

Applications

• Battery or solar-powered systems

• Strain gauge

• Sensor signal conditioning

• Medical devices

• Industrial instrumentations

Related Literature

• AN1290, ISL2827xINEVAL1Z Evaluation Board User’s
Guide

• AN1298, Instrumentation Amplifier Application Note

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.

Copyright © Intersil Americas Inc. 2006, 2007. All Rights Reserved.

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

Pinouts

NC

OUT_A

FB+_A

FB-_A

IN-_A

IN+_A

EN

_A

ISL28270, ISL28273

(16 LD QSOP)

TOP VIEW

1

2

3

-

+

4

5

6

7

V-

8

ISL28270, ISL28273, ISL28470

ISL28470

(28 LD QSOP)

TOP VIEW

V+

16

OUT_B

15

FB+_B

14

+

-

FB-_B

13

IN-_B

12

IN+_B

11

EN

_B

10

NC

9

OUT_A

FB+_A

FB-_A

IN-_A

IN+_A

EN

_A

_B

EN

IN+_B

IN-_B

FB-_B

FB+_B

OUT_B

NC

1

2

-+

3

4

5

6

7

V-

8

9

10

11

-+ -+

12

13

14

28

OUT_D

27

26

25

24

23

22

21

20

19

18

17

16

15

FB+_D

FB-_D

IN-_D

IN+_D

EN

_D

V-

_C

EN

IN+_C

IN-_C

FB-_C

FB+_C

OUT_C

NC

+

-

2

FN6260.2

April 13, 2007

ISL28270, ISL28273, ISL28470

Absolute Maximum Ratings (T

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

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

Input Current (IN, FB) ISL28270, ISL28470 . . . . . . . . . . . . . . . 5mA

Differential Input Voltage (IN, FB) ISL28270, ISL28470 . . . . . . 0.5V

Input Current (IN, FB) ISL28273 . . . . . . . . . . . . . . . . . . . . . . . . 5mA

Differential Input (IN, FB) Voltage ISL28273 . . . . . . . . . . . . . . . 1.0V

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

ESD Tolerance

Human Body Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3kV

= +25°C) Thermal Information

A

Thermal Resistance θ

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

28 Ld QSOP Package . . . . . . . . . . . . . . . . . . . . . . . 79

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

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

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

- 0.5V to V+ + 0.5V

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

Pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . .see link below

http://www.intersil.com/pbfree/Pb-FreeReflow.asp

(°C/W)

JA

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, VM = GND, V

+

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

A

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

CM

PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT

V

OS

Input Offset Voltage ISL28270, ISL28470 -150

-225

±35 150

225

µV

ISL28273 TBD µV

TCV

I

OS

OS

Input Offset Voltage Temperature
Coefficient

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

Temperature = -40°C to +125°C 0.7 µV/°C

ISL28270 -1

-1.5

±0.25 1

1.5

nA

ISL28470 -1.5

-2.0

±0.25 1.5

2

nA

ISL28273 TBD nA

I

B

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

ISL28270 -2.0

-2.5

ISL28470 -2.5

-3.0

±0.5 2.0

2.5

±0.5 2.5

3.0

nA

nA

ISL28273 TBD nA

e

N

Input Noise Voltage ISL28270, ISL28470 f = 0.1Hz to 10Hz 3.5 µV

ISL28273 3.5 µV

P-P
P-P

Input Noise Voltage Density ISL28270, ISL28470 fo = 1kHz 60 nV/√Hz

ISL28273 210 nV/√Hz

i

N

Input Noise Current Density ISL28270, ISL28470 fo = 1kHz 0.48 pA/√Hz

ISL28273 0.65 pA/√Hz

R

IN

Input Resistance ISL28270, ISL28470 3 MΩ

ISL28273 15 MΩ

V

IN

Input Voltage Range V+ = 2.4V to 5.0V 0 V

+

V

3

FN6260.2

April 13, 2007

ISL28270, ISL28273, ISL28470

Electrical Specifications V

= +5V, VM = GND, V

+

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

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

CM

PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT

CMRR Common Mode Rejection Ratio ISL28270 VCM = 0.05V to 5V 90

110 dB

TBD

ISL28273 TBD dB
ISL28470 90

110 dB

85

PSRR Power Supply Rejection Ratio ISL28270 V

= 2.4V to 5V 90

+

110 dB

TBD

ISL28273 TBD dB
ISL28470 90

110 dB

65

E

G

Gain Error ISL28270, ISL28470 RL = 100kΩ to 2.5V +0.5 %

ISL28273 TBD %

V

OUT

Maximum Voltage Swing Output low, 100kΩ to 2.5V 4 10 mV

Output low, 1kΩ to 2.5V 130 250

300

Output high, 100kΩ to 2.5V 4.990 4.996 V
Output high, 1kΩ to GND 4.75

4.88 V

4.70

SR Slew Rate R

= 1kΩ to GND 0.3

L

0.25

0.5 0.7

0.75

-3dB BW -3dB Bandwidth ISL28270, ISL28470 Gain = 100 240 kHz
Gain = 200 84 kHz
Gain = 500 30 kHz
Gain = 1000 13 kHz

ISL28273 Gain = 10 265 kHz

Gain = 20 100 kHz
Gain = 50 25 kHz
Gain = 100 13 kHz

I

S,EN

I

S,DIS

V

ENH

V

ENL

I

ENH

I

ENL

V

+

Supply Current, Enabled ISL28270 - Both A and B channels enabled,

EN

=V-

ISL28470 - A, B, C and D channels enabled,
EN

= V-

Supply Current, Disabled ISL28270 - Both A and B channels disabled,

EN

=V+

ISL28470 - A, B, C and D channels disabled,

= V+

EN

120 156

195

260 335 µA

479µA

10 12

15

EN Pin for Shut-down 2 V
EN Pin for Power-On 0.8 V
EN Input Current High EN = V+ 0.8 1

1.3

EN Input Current Low EN = V- 26 50

100

Minimum Supply Voltage 2.4 V

mV

V/µs

µA

µA

µA

nA

4

FN6260.2

April 13, 2007

ISL28270, ISL28273, ISL28470

Electrical Specifications V

= +5V, VM = GND, V

+

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

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

CM

PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT

I

SC

Short Circuit Output Current V+ = 5V, R

V

= 2.4V, R

+

= 10Ω ±20

LOAD

= 10Ω ±8 mA

LOAD

±18

±29 mA

Typical Performance Curves

90

80

70

60

GAIN (dB)

50

40

30

GAIN = 2,000V/V
GAIN = 1,000V/V

GAIN = 500V/V

GAIN = 200V/V
GAIN = 100V/V

1 10 100 1k 10k 100k 1M

COMMON-MODE INPUT = VS+

GAIN = 10,000V/V

GAIN = 5,000V/V

FREQUENCY (Hz)

FIGURE 1. ISL28270, ISL28470 FREQUENCY RESPONSE vs

CLOSED LOOP GAIN (V+ = V

CM

= 5V)

70

60

50

40

GAIN (dB)

30

20

10

1E+00 1E+01 1E+02 1E+03 1E+04 1E+05 1E+06

GAIN = 1000
GAIN = 500

GAIN = 200
GAIN = 100
GAIN = 50

GAIN = 20
GAIN = 10

COMMON-MODE INPUT = V+

FREQUENCY (Hz)

FIGURE 2. ISL28273 FREQUENCY RESPONSE vs CLOSED

LOOP GAIN (V

CM

= V+)

90

80

70

60

GAIN (dB)

50

40

30

GAIN = 2,000V/V
GAIN = 1,000V/V

GAIN = 500V/V

GAIN = 200V/V
GAIN = 100V/V

1 10 100 1k 10k 100k 1M

COMMON-MODE INPUT = 1/2V

GAIN = 10,000V/V

GAIN = 5,000V/V

FREQUENCY (Hz)

S

FIGURE 3. ISL28270, ISL28470 FREQUENCY RESPONSE vs

CLOSED LOOP GAIN (V+ = 5V, V

CM

= 1/2V+)

70

60

50

40

GAIN (dB)

30

20

10

1E+00 1E+01 1E+02 1E+03 1E+04 1E+05 1E+06

GAIN = 1000
GAIN = 500

GAIN = 200
GAIN = 100
GAIN = 50

GAIN = 20
GAIN = 10

COMMON-MODE INPUT = 1/2V

FREQUENCY (Hz)

+

FIGURE 4. ISL28273 FREQUENCY RESPONSE vs CLOSED

LOOP GAIN (V

CM

= 1/2V+)

5

FN6260.2

April 13, 2007