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ISL28278, ISL28478

Data Sheet

July 11, 2007

FN6145.2

Dual and Quad Micropower Single Supply

Rail-to-Rail Input and Output (RRIO)

Op-Amp

The ISL28278 and ISL28478 are dual and quad channel

micropower operational amplifiers optimized for single

supply operation over the 2.4V to 5V range. They can be

operated from one lithium cell or two Ni-Cd batteries. For

equivalent performance in a single channel op-amp

reference EL8178.

These devices feature an Input Range Enhancement Circuit

(IREC) which enables them to maintain CMRR performance

for input voltages 10% above the positive supply rail and to

100mV below the negative supply. The output operation is

rail to rail.

The ISL28278 and ISL28478 draw minimal supply current

while meeting excellent DC-accuracy, AC-performance,

noise and output drive specifications. The ISL28278

contains a power down enable pin that reduces the power

supply current to typically 4µA in the disabled state.

Features

• Low power 120µA typical supply current (ISL28278)

• 225μV max offset voltage

• 30pA max input bias current

• 300kHz typical gain-bandwidth product

• 105dB typical PSRR

• 100dB typical CMRR

• Single supply operation down to 2.4V

• Input is capable of swinging above V+ and below V-

(ground sensing)

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

• Enable Pin (ISL28278 only)

• Pb-free plus anneal available (RoHS compliant)

Applications

• Battery- or solar-powered systems

• 4mA to 25mA current loops

Pinouts

ISL28278 (16 LD QSOP)

TOP VIEW

NC

1

NC 2

OUT_A

3

-

+

IN-_A

4

IN+_A

5

EN_A

6

V- 7

NC

8

-

+

16

NC

15

V+

14

OUT_B

13 IN-_B

12

IN+_B

11

EN_B

10

NC

9

NC

• Handheld consumer products

• Medical devices

• Thermocouple amplifiers

• Photodiode pre-amps

• pH probe amplifiers

Ordering Information

PART NUMBER

(Note)

ISL28278FAZ*

ISL28478FAZ*

PART

MARKING

28278FAZ

28478FAZ

PACKAGE

(Pb-Free)

16 Ld QSOP

PKG.

DWG. #

MDP0040

ISL28478 (16 LD QSOP)

TOP VIEW

OUT_A

1

IN-_A 2

-

+

IN+_A

3

V+

4

IN+_B

5

IN-_B

6

OUT_B 7

NC

8

+

-

+

-

+

16

OUT_D

15

IN-_D

14 IN+_D

13

V-

12

IN+_C

11

IN-_C

10

OUT_C

9

NC

*“-T7” suffix is for tape and reel. Please refer to TB347 for details on

reel specifications.

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.

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.

ISL28278, ISL28478

Absolute Maximum Ratings

(T

A

= +25°C)

Supply Voltage, V

-

to V

+

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5V

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

Differential Input Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mA

Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5V

Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . V- - 0.5V to V+ + 0.5V

ESD Tolerance

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

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

Thermal Information

Thermal Resistance

θ

JA

(°C/W)

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

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

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

J

= T

C

= T

A

Operating Junction

Electrical Specifications

V

+

= 5V, V

-

= 0V, V

CM

= 2.5V, R

L

= Open, T

A

= +25°C unless otherwise specified.

Boldface limits apply over the operating temperature range, -40°C to +125°C, temperature data

established by characterization

CONDITIONS

MIN

(Note 1)

TYP

MAX

(Note 1)

UNIT

PARAMETER

DC SPECIFICATIONS

V

OS

ΔV

OS

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

-

ΔT

I

OS

I

B

CMIR

CMRR

PSRR

A

VOL

DESCRIPTION

Input Offset Voltage

Input Offset Voltage vs Temperature

Input Offset Current

-40°C to +85°C

Input Bias Current

-40°C to +85°C

Common-Mode Voltage Range

Common-Mode Rejection Ratio

Power Supply Rejection Ratio

Large Signal Voltage Gain

Guaranteed by CMRR

V

CM

= 0V to 5V

V+ = 2.4V to 5V

V

O

= 0.5V to 4.5V, R

L

= 100kΩ

V

O

= 0.5V to 4.5V, R

L

= 1kΩ

-225

-450

±

0.20

225

450

µV

µV/°C

1.0

-30

-80

-30

-80

0

80

75

85

80

200

190

100

105

300

60

3

130

4.990

4.97

4.800

4.750

4.996

4.880

120

240

4

156

175

315

350

7

9

6

30

175

225

±

5

30

80

30

80

5

pA

V

dB

V/mV

mV

V

µA

±

10

V

OUT

Maximum Output Voltage Swing

Output low, R

L

= 100kΩ

Output low, R

L

= 1kΩ

Output high, R

L

= 100kΩ

Output high, R

L

= 1kΩ

I

S,ON

Quiescent Supply Current, Enabled

ISL28278, All channels enabled.

ISL28478, All channels enabled.

I

S,OFF

Quiescent Supply Current, Disabled

All channels disabled.

ISL28278

2

FN6145.2

July 11, 2007

ISL28278, ISL28478

Electrical Specifications

V

+

= 5V, V

-

= 0V, V

CM

= 2.5V, R

L

= Open, T

A

= +25°C unless otherwise specified.

Boldface limits apply over the operating temperature range, -40°C to +125°C, temperature data

established by characterization (Continued)

CONDITIONS

R

L

= 10Ω

R

L

= 10Ω

V

-

to V

+

ISL28278

VEN = V+

ISL28278

VEN = V-

ISL28278

0.8

0

MIN

(Note 1)

29

24

20

2.4

2

0.8

1

1.5

0.1

TYP

31

26

5.0

MAX

(Note 1)

UNIT

mA

V

µA

PARAMETER

I

O

+

I

O

-

V

SUPPLY

V

ENH

V

ENL

I

ENH

I

ENL

DESCRIPTION

Short Circuit Sourcing Capability

Short Circuit Sinking Capability

Supply Operating Range

EN Pin High Level

EN Pin Low Level

EN Pin Input High Current

EN Pin Input Low Current

AC SPECIFICATIONS

GBW

e

n

Gain Bandwidth Product

Input Noise Voltage Peak-to-Peak

Input Noise Voltage Density

i

n

CMRR @ 60Hz

PSRR+ @

120Hz

PSRR- @

120Hz

Input Noise Current Density

Input Common Mode Rejection Ratio

Power Supply Rejection Ratio, +V

Power Supply Rejection Ratio, -V

A

V

= 100, R

F

= 100kΩ, R

G

= 1kΩ,

R

L

= 10kΩ to V

CM

f = 0.1Hz to 10Hz

f

O

= 1kHz

f

O

= 1kHz

V

CM

= 1V

P-P

, R

L

= 10kΩ to V

CM

V

+

,V

-

= ±1.2V and ±2.5V,

300

4.5

45

0.04

-70

-80

-60

kHz

µV

P-P

nV/√Hz

pA/√Hz

dB

V

SOURCE

= 1V

P-P

, R

L

= 10kΩ to V

CM

V

+

,V

-

= ±1.2V and ±2.5V

V

SOURCE

= 1V

P-P

, R

L

= 10kΩ to V

CM

TRANSIENT RESPONSE

SR

t

EN

Slew Rate

Enable to Output Turn-on Delay Time,

10% EN to 10% Vout

Enable to Output Turn-off Delay Time,

10% EN to 10% Vout

NOTE:

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

VEN

= 5V to 0V, A

V

= -1,

R

G

= R

F

= R

L

= 1k

to V

CM

, ISL28278

VEN

= 0V to 5V, A

V

= -1,

R

G

= R

F

= R

L

= 1k

to V

CM

, ISL28278

±

0.12

±

0.09

±

0.14

±

0.16

±

0.21

V/µs

µs

2

0.1

3

FN6145.2

July 11, 2007

ISL28278, ISL28478

Typical Performance Curves

V

+

= 5V, V

-

= 0V, V

CM

= 2.5V, R

L

= Open, unless otherwise specified.

+1

0

-1

-2

GAIN (dB)

-3

-4

-5

-6

-7

8

1k

V

OUT

= 50mV

P-P

A

V

= 1

C

L

= 3pF

R

F

= 0, R

G

= INF

10k

100k

FREQUENCY (Hz)

1M

5M

V

+

,V

-

= ±2.5V

RL = 10k

V

+

,V

-

= ±2.5V

RL = 1k

V

+

,V

-

= ±1.2V

RL = 1k

GAIN (dB)

V

+

,V

-

= ±1.2V

RL = 10k

45

40

35

30

25

20

15

10

5

0

100

A

V

= 100

R

L

= 10kΩ

C

L

= 3pF

R

F

= 100kΩ

R

G

= 1kΩ

1k

V

+

,V

-

= ±2.5V

V

+

,V

-

= ±1.2V

V

+

,V

-

= ±1.0V

10k

FREQUENCY (Hz)

100k

1M

FIGURE 1. FREQUENCY RESPONSE vs SUPPLY VOLTAGE

FIGURE 2. FREQUENCY RESPONSE vs SUPPLY VOLTAGE

120

80

GAIN

GAIN (dB)

40

0

PHASE

-40

-80

1

10

100

1k

10k

100k

1M

FREQUENCY (Hz)

80

40

PHASE (°)

GAIN (dB)

0

-40

-80

-120

10M

100

80

PHASE

60

40

200

150

100

50

0

PHASE (°)

20

0

-20

10

GAIN

-50

-100

-150

1M

100

1k

10k

100k

FREQUENCY (Hz)

FIGURE 3. A

VOL

vs FREQUENCY @ 100kΩ LOAD

FIGURE 4. A

VOL

vs FREQUENCY @ 1kΩ LOAD

10

0

-10

-20

PSRR (dB)

-30

-40

-50

-60

-70

-80

-90

10

V

+

,V

-

= ±2.5VDC

V

SOURCE

= 1V

P-P

R

L

= 10kΩ

A

V

= +1

PSRR -

CMRR (dB)

0

-10

-20

-30

-40

-50

-60

-70

-80

-90

-100

10

V

+

,V

-

= ±2.5VDC

V

SOURCE

= 1V

P-P

R

L

= 10kΩ

PSRR +

-100

10

100

1k

10k

100k

1M

100

1k

10k

100k

1M

FREQUENCY (Hz)

FIGURE 5. PSRR vs FREQUENCY

FIGURE 6. CMRR vs FREQUENCY

4

FN6145.2

July 11, 2007

ISL28278, ISL28478

Typical Performance Curves

V

+

= 5V, V

-

= 0V, V

CM

= 2.5V, R

L

= Open, unless otherwise specified.

1k

VOLTAGE NOISE (nV/√Hz)

CURRENT NOISE (fA/√Hz)

1

10

100

FREQUENCY (Hz)

1k

10k

1k

100

10

1

10

100

FREQUENCY (Hz)

1k

10k

FIGURE 7. VOLTAGE NOISE vs FREQUENCY

FIGURE 8. CURRENT NOISE vs FREQUENCY

2.56

2.5

VOLTAGE NOISE (0.5µV/DIV)

2.0

1.5

VOLTS (V)

1.0

0.5

0

-0.5

-1.0

-1.5

-2.0

-2.5

2.42

0

1

2

3

4

5

6

7

8

9

10

0

2

4

6

8

10

12

14

16

18

20

TIME (1s/DIV)

TIME (µs)

2.46

2.44

2.52

V

OUT

2.50

2.48

V

+

= 5VDC

V

OUT

= 0.1V

P-P

R

L

= 1kΩ

A

V

= +1

V

IN

2.54

FIGURE 9. 0.1Hz TO 10Hz INPUT VOLTAGE NOISE

FIGURE 10. SMALL SIGNAL TRANSIENT RESPONSE

5

4

3

2

1

0

50

100

150

200

250

V

IN

0.1V/DIV

V

+

= 5VDC

V

OUT

= 4V

P-P

R

L

= 1kΩ

A

V

= -2

V

OUT

1V/DIV

EN

INPUT

A

V

= -1

V

IN

= 200mV

P-P

V+ = 5V

VOLTS (V)

0

V

OUT

0

10µs/DIV

TIME (µs)

FIGURE 11. LARGE SIGNAL TRANSIENT RESPONSE

FIGURE 12. ISL28278 ENABLE TO OUTPUT DELAY TIME

5

FN6145.2

July 11, 2007

28278FAZ

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