intersil ISL28274, ISL28474 DATA SHEET

®

ISL28274, ISL28474

Data Sheet August 17, 2007

Micropower, Single Supply, Rail-to-Rail Input-Output Instrumentation Amplifier and Precision Operational Amplifier

The ISL28274 is a combination of a micropower instrumentation amplifier (Amp A) with a low power precision amplifier (Amp B) in a single package. The ISL28474 consists of two micropower instrumentation amplifiers (Amp A) and two low power precision amplifiers (Amp B) in a single package. The amplifiers are optimized for operation at

2.4V to 5V single supplies. Inputs and outputs can operate rail-to-rail. As with all instrumentation amplifiers, a pair of inputs provide a high common-mode rejection and are completely independent from a pair of feedback terminals. The feedback terminals allow zero input to be translated to any output offset, including ground. A feedback divider controls the overall gain of the amplifier. The additional precision amplifier can be used to generate higher gain, with smaller feedback resistors or used to generate a reference voltage.

The instrumentation amp (Amp A) is compensated for a gain of 100 or more and the precision amp (Amp B) is unity gain stable. Both amplifiers have PMOS inputs that provide less than 30pA input bias currents.

FN6345.2

Features

• Combination of IN-AMP and OP-AMP in a single package

• 120µA supply current for ISL28274

• Input offset voltage IN-AMP 500µV max

• Input offset voltage OP-AMP 225µV max

• 30pA max input bias current

• 100dB CMRR and PSRR

• Single supply operation of 2.4V to 5.0V

• Ground sensing

• Input voltage range is rail-to-rail and output swings rail-to-rail

• Pb-free available (RoHS compliant)

Applications

• 4mA to 20mA loops

• Industrial process control

• Medical instrumentation

The amplifiers can be operated from one lithium cell or two Ni-Cd batteries. The amplifiers input range goes from below ground to slightly above positive rail. The output stage swings completely to ground or positive supply; no pull-up or pull-down resistors are needed.

Ordering Information

PART NUMBER

(Note)

ISL28274FAZ* 28274 FAZ 16 Ld QSOP MDP0040 ISL28474FAZ* ISL28474 FAZ 24 Ld QSOP MDP0040 *Add “-T7” suffix for tape and reel. Please refer to TB347 for details

on reel specifications. NOTE: These Intersil Pb-free plastic packaged products employ

special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate PLUS ANNEAL - e3 termination finish, which is 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

PACKAGE

(Pb-free)

PKG.

DWG. #

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.

Pinout

ISL28274

(16 LD QSOP)

TOP VIEW

ISL28274, ISL28474

ISL28474

(24 LD QSOP)

TOP VIEW

1

NC

IA OUT

2

IA FB+

3

A

-+

B

IA FB-

4

IA IN- IN-

5

IA IN+

6

IA EN

7

8 9

V- NC

IA = Instrumentation Amplifier

= Instrumentation Amplifier

A

-+

= Precision Amplifier

B

-+

16

V+

OUT

15

NC

14

NC

13

12

11

IN+

EN

10

IA OUT_1

IA FB+_1

IA FB-_1

IA IN-_1

IA IN+_1 IA IN+_2

IA EN

1

2

A

-+

3

4

5

6

_1

V+

7

EN

8 17

_1 EN_2

IN+_1 IN+_2

9

IN-_1

10

NC

OUT_1 OUT_2

IA = Instrumentation Amplifier

A

-+

-+ B

-+

11

12

B

= Instrumentation Amplifier

= Precision Amplifier

A

B

-+

24

IA OUT_2

IA FB+_2

23

IA FB-_2

22

IA IN-_2

21

20

19

IA EN_2

V-

18

16

IN-_2

15

NC

14 13

2

FN6345.2

August 17, 2007

ISL28274, ISL28474

Absolute Maximum Ratings (T

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

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

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

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

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

ESD Rating

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

Machine Model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .300V

= +25°C) Thermal Information

A

Thermal Resistance θ

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

24 Ld QSOP Package . . . . . . . . . . . . . . . . . . . . . . . 88

- 0.5V to V+ + 0.5V

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

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

(°C/W)

JA

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

CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and result in failures not covered by warranty.

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: T

Electrical Specifications INSTRUMENTATION AMPLIFIER “A” V

= TC = T

J

A

= +5V, V- = GND, VCM = 1/2V+, TA = +25°C, unless otherwise

+

specified. For ISL28274 ONLY. Boldface limits apply over the operating temperature range, -40°C to +125°C, temperature data established by characterization

PARAMETER DESCRIPTION CONDITIONS

V

OS

Input Offset Voltage ISL28274 -400

ISL28474 -500

TCV

Input Offset Voltage

OS

Temperature = -40°C to +125°C 3 µV/°C

MIN

(Note 1) TYP

-750

MAX

(Note 1) UNIT

35 400

750

35 500

750

µV

Temperature Coefficient

I

OS

Input Offset Current between IN+ and IN-, and

(see Figure 44 for extended temperature range)

-40°C to +85°C

-30

-80

±530

80

pA

between FB+ and FB-

I

B

e

N

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

(see Figure 36 and 37 for extended temperature range)

-40°C to +85°C

-30

-80

±10 30

80

Input Noise Voltage f = 0.1Hz to 10Hz 6 µV

pA

P-P

Input Noise Voltage Density fo = 1kHz 78 nV/√Hz

i

N

R

IN

V

IN

CMRR Common Mode Rejection

PSRR Power Supply Rejection

E

G

SR Slew Rate R

GBWP Gain Bandwidth Product V

Input Noise Current Density fo = 1kHz 0.19 pA/√Hz Input Resistance 1GΩ Input Voltage Range V+ = 2.4V to 5.0V 0 V

V

Ratio

= 0V to 5V 80

CM

V

= 2.4V to 5V 80

+

75

100 dB

+

V

Gain Error RL = 100kΩ to 2.5V -0.2 %

= 1kΩ to VCM ISL28274 0.40

L

ISL28474 0.40

OUT

= 10mV

; RL = 10kΩ 6MHz

P-P

0.35

0.5 0.65

0.70

0.5 0.7

0.75

V/µs

3

FN6345.2

August 17, 2007

ISL28274, ISL28474

Electrical Specifications OPERATIONAL AMPLIFIER “B” V

= +5V, V- = GND, VCM = 1/2V+, TA = +25°C, unless otherwise specified.

+

For ISL28274 ONLY. Boldface limits apply over the operating temperature range, -40°C to +125°C.

PARAMETER DESCRIPTION CONDITIONS

V

OS

ΔV

OS

------------------

ΔTi me

ΔV

OS

--------------- -

ΔT I

OS

I

B

e

N

Input Offset Voltage -225

Long Term Input Offset Voltage Stability

Input Offset Drift vs Temperature 2.2 µV/°C

Input Offset Current (see Figure 46 for extended temperature range)

-40°C to +85°C

Input Bias Current (see Figures 40 and 41 for extended temperature range)

-40°C to +85°C

Input Noise Voltage Peak-to-Peak f = 0.1Hz to 10Hz 5.4 µV

MIN

(Note 1) TYP

±20 225

-450

1.2 µV/Mo

-30

-80

-30

±10 30

-80

MAX

(Note 1) UNIT

450

±530

Input Noise Voltage Density fO = 1kHz 50 nV/√Hz

i

N

Input Noise Current Density fO = 1kHz 0.14 pA/√Hz

CMIR Input Voltage Range Guaranteed by CMRR test 05V

CMRR Common-Mode Rejection Ratio V

PSRR Power Supply Rejection Ratio V

A

VOL

Large Signal Voltage Gain VO = 0.5V to 4.5V, RL = 100kΩ 200

SR Slew Rate R

GBW Gain Bandwidth Product V

= 0V to 5V 80

CM

= 2.4V to 5V 85

+

= 1kΩ to VCM 0.12

L

OUT

= 10mV

; RL = 10kΩ 300 kHz

P-P

75

80

190

0.09

100 dB

105 dB

300 V/mV

±0.14 0.16

0.21

µV

pA

80

pA

80

P-P

V/µs

Electrical Specifications COMMON ELECTRICAL SPECIFICATIONS V

specified. For ISL28274 ONLY. Boldface limits apply over the operating temperature range, -40°C to +125°C.

PARAMETER DESCRIPTION CONDITIONS

V

OUT

I

S,ON

I

S,OFF

I

SC

Maximum Output Voltage Swing Output low, RL = 100kΩ to VCM 3 6

Output low, R

Output high, R

= 1kΩ to VCM 130 175

L

= 100kΩ to VCM 4.990

L

= 1kΩ to VCM 4.800

L

Supply Current, Enabled ISL28274 All channels enabled 120 156

ISL28474 All channels enabled 240 315

Supply Current, Disabled ISL28274 All channels disabled 4 7

ISL28474 All channels disabled 10 15

+ Short Circuit Sourcing Capability RL = 10Ω to VCM 28

= 5V, V- = GND, VCM = 1/2V+, TA = +25°C, unless otherwise

+

MIN

(Note 1) TYP

MAX

(Note 1) UNIT

mV

30

mV

225

4.996 V

4.97

4.880 V

4.750

µA

175

µA

350

µA

9

µA

20

31 mA

24

4

FN6345.2

August 17, 2007

ISL28274, ISL28474

Electrical Specifications COMMON ELECTRICAL SPECIFICATIONS V

specified. For ISL28274 ONLY. Boldface limits apply over the operating temperature range, -40°C to +125°C.

= 5V, V- = GND, VCM = 1/2V+, TA = +25°C, unless otherwise

+

(Continued)

MIN

PARAMETER DESCRIPTION CONDITIONS

(Note 1) TYP

ISC- Short Circuit Sinking Capability RL = 10Ω to VCM 24

20

V

I

ENH

I

ENL

+

INH

INL

Minimum Supply Voltage 2.4 V Enable Pin High Level 2 V Enable Pin Low Level 0.8 V Enable Pin Input Current VEN = 5V 0.8 1

Enable Pin Input Current VEN = 0V 0

NOTE:

1. Parts are 100% tested at +25°C. Over temperature limits established by characterization and are not production tested.

Typical Performance Curves 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

COMMON-MODE INPUT = V

= +5V, V- = GND, VCM = 1/2V+, TA = +25°C, unless otherwise specified.

+

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

COMMON-MODE INPUT = 1/2V

MAX

(Note 1) UNIT

26 mA

µA

1.3

26

50

100

µA

+

30

1 10 100 1k 10k 100k 1M

FREQUENCY (Hz)

FIGURE 1. AMPLIFIER “A” (IN-AMP) FREQUENCY

RESPONSE vs CLOSED LOOP GAIN

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

COMMON-MODE INPUT = VM +10mV

FREQUENCY (Hz)

FIGURE 3. AMPLIFIER “A” (IN-AMP) FREQUENCY

RESPONSE vs CLOSED LOOP GAIN

30

1 10 100 1k 10k 100k 1M

FREQUENCY (Hz)

FIGURE 2. AMPLIFIER “A” (IN-AMP) FREQUENCY

RESPONSE vs CLOSED LOOP GAIN, V

45 40 35 30 25 20

GAIN (dB)

15 10

5 0

10

AV = 100

= 10kΩ

R

L

= 10pF

C

L

= 100

R

F/RG

= 10kΩ

R

F

= 100Ω

R

G

100 10k1k 100k 1M

FREQUENCY (Hz)

V

= 2.4V

+

V+ = 5V

FIGURE 4. AMPLIFIER “A” (IN-AMP) FREQUENCY

RESPONSE vs SUPPLY VOLTAGE

CM

= 1/2V

+

5

FN6345.2

August 17, 2007

ISL28274, ISL28474

Typical Performance Curves V

50

45

40

35

GAIN (dB)

30

25

AV = 100

= 10kΩ

R

= 10pF

C

L

R

F/RG

= 10kΩ

R

F

= 100Ω

R

G

10

= 100

100 10k1k 100k 1M

FREQUENCY (Hz)

= +5V, V- = GND, VCM = 1/2V+, TA = +25°C, unless otherwise specified. (Continued)

+

2200pF

1200pF

820pF

56pF

FIGURE 5. AMPLIFIER “A” (IN-AMP) FREQUENCY

RESPONSE vs C

120

100

80

60

PSRR (dB)

40

AV = 100

20

0

10 100 1k 10k 100k 1M

LOAD

PSRR+

PSRR-

FREQUENCY (Hz)

FIGURE 7. AMPLIFIER “A” (IN-AMP) PSRR vs FREQUENCY

120

100

80

60

CMRR (dB)

AV = 100

40

20

0

10 100 1k 10k 100k

FREQUENCY (Hz)

1M

FIGURE 6. AMPLIFIER “A” (IN-AMP) CMRR vs FREQUENCY

700

600

500

400

300

200

100

INPUT VOLTAGE NOISE (nV/ √Hz)

0

1 10 100 1k 10k 100k

AV = 100

FREQUENCY (Hz)

FIGURE 8. AMPLIFIER “A” (IN-AMP) INPUT VOLTAGE NOISE

SPECTRAL DENSITY

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

CURRENT NOISE (pA/√Hz)

0.2

0.0 1 10 100 1k

AV = 100

10k

FREQUENCY (Hz)

FIGURE 9. AMPLIFIER “A” (IN-AMP) INPUT CURRENT

NOISE SPECTRAL DENSITY

6

100k

VOLTAGE NOISE (2µV/DIV)

TIME (1s/DIV)

FIGURE 10. AMPLIFIER “A” (IN-AMP) 0.1Hz TO 10Hz INPUT

VOLTAGE NOISE

FN6345.2

August 17, 2007