intersil ISL28278, ISL28478 DATA SHEET

®

ISL28278, ISL28478

Data Sheet September 28, 2006

Dual Micropower Single Supply
Rail-to-Rail Input and Output (RRIO)
Precision Op-Amp

The ISL28278 and ISL28478 are Dual and Quad channel
micropower precision operational amplifier optimized for
single supply operation at 5V and can operate down to 2.4V.
For equivalent performance in a single channel op-amp
reference EL8178.

The ISL28278 and ISL28478 feature an Input Range
Enhancement Circuit (IREC) which enables both parts to
maintain 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 both parts draw minimal supply current while meeting
excellent DC-accuracy, AC-performance, noise and output
drive specifications.

The ISL28278 and ISL28478 can be operated from one
lithium cell or two Ni-Cd batteries. The input range includes
both positive and negative rail.

Ordering Information

PART

PART NUMBER

ISL28278FAZ
(See Note)

ISL28278FAZ-T7
(See Note)

Coming Soon

ISL28478FAZ
(Note)

Coming Soon

ISL28478FAZ-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.

MARKING

28278FAZ 97/Tube 16 Ld QSOP

28278FAZ 7”

28478FAZ 97/Tube 16 Ld QSOP

28478FAZ 7”

TAPE &

REEL PACKAGE

(Pb-free)
16 Ld QSOP

(1000 pcs)

(1000 pcs)

(Pb-free)

(Pb-free)

16 Ld QSOP
(Pb-free)

PKG.

DWG. #

MDP0040

MDP0040

MDP0040

MDP0040

FN6145.1

Features

• Low Power 120µA typ supply current for both channels

• 225µV max offset voltage

• 30pA typ input bias current

• 300kHz gain-bandwidth product

• 100dB typ PSRR and 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)

• Pb-free plus anneal available (RoHS compliant)

Applications

• Battery- or solar-powered systems

• 4mA to 25mA current loops

• Handheld consumer products

• Medical devices

• Thermocouple amplifiers

• Photodiode pre-amps

• pH probe amplifiers

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.

Copyright Intersil Americas Inc. 2006. All Rights Reserved

Pinouts

ISL28278

(16 LD QSOP)

TOP VIEW

ISL28278, ISL28478

ISL28478

(16 LD QSOP)

TOP VIEW

1

NC

NC

2

OUT_A

3

-

IN-_A

IN+_A IN+_B

EN

_A

V-

NC NC

+

4

5

6

7

8 9

16

NC

V+

15

OUT_B

14

+

­IN-_B

13

12

11

EN_B

NC

10

1

OUT_A

IN-_A

2

-

IN+_A

3

V+

4

IN+_B IN+_C

5

IN-_B

6

OUT_B

7

NC NC

8 9

+

+

-

16

OUT_D

IN-_D

15

+

-

IN+_D

14

V-

13

12

-

+

11

10

IN-_C

OUT_C

2

FN6145.1

September 28, 2006

ISL28278, ISL28478

Absolute Maximum Ratings (T

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

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

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

= +25°C)

A

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

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

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

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

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

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

- 0.5V to V+ + 0.5V

-

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
: 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 V+ = 5V, V- = 0V,V

= TC = T

J

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

A

= 2.5V, RL = 10kΩ, TA = +25°C unless otherwise specified.

CM

PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT

V

OS

ΔV

OS

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

ΔTi me

ΔV

OS

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

ΔT

I

OS

I

B

e

N

Input Offset Voltage -225

-450

±20 225

450

µV

Long Term Input Offset Voltage Stability 1.2 µV/Mo

Input Offset Drift vs Temperature 2.2 µV/°C

Input Offset Current

-600

Input Bias Current

-40°C to +85°C

-30

-80

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

±530

600

±10 30

80

pA

pA

PP

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

= 0V to 5V 80

CM

= 2.4V to 5V 85

+

75

100 dB

105 dB

80

A

V

VOL

OUT

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

190

V

= 0.5V to 4.5V, RL = 1kΩ 25 V/mV

O

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

300 V/mV

Output low, R

Output high, R

= 1kΩ 130 175

L

= 100kΩ 4.990

L

4.996 V

mV

225

4.97

Output high, R

SR Slew Rate 0.12

= 1kΩ 4.800

L

4.750

0.09

4.880 V

±0.14 0.16

V/µs

0.21

GBW Gain Bandwidth Product 300 kHz

3

FN6145.1

September 28, 2006

ISL28278, ISL28478

Electrical Specifications V+ = 5V, V- = 0V,V

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

= 2.5V, RL = 10kΩ, TA = +25°C unless otherwise specified.

CM

PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT

I

S,ON

I

S,OFF

Supply Current, Enabled All channels enabled. 120 156

175

Supply Current, Disabled All channels disabled. 4 7

9

I

+ Short Circuit Sourcing Capability RL = 10Ω 29

SC

- Short Circuit Sinking Capability RL = 10Ω 24

I

SC

V
V
V
I

ENH

S
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

24

20

31 mA

26 mA

1.5

I

ENL

Enable Pin Input Current VEN = 0V -0.1 0 +0.1 µA

Typical Performance Curves

GAIN (dB)

+1

0

-1

-2

-3

-4

-5

-6

-7
8

1k

V

= 50mVp-p

OUT

A

= 1

V

= 3pF

C

L

=0/RG = INF

R

F

VS = ±2.5V

RL = 1k

VS = ±2.5V

RL = 10k

10k 100k 1M

FREQUENCY (Hz)

VS = ±1.2V

RL = 1k

VS = ±1.2V

RL = 10k

5M

45
40
35
30
25
20

AV = 100

GAIN (dB)

15

= 10kΩ

R

L

= 3pF

C

L

10

= 100kΩ

R

F

= 1kΩ

R

G

5
0

100 10k 100k 1M

VS = ±1.0V

1k

FREQUENCY (Hz)

VS = ±2.5V

VS = ±1.2V

µA

µA

µA

FIGURE 1. FREQUENCY RESPONSE vs SUPPLY VOLTAGE FIGURE 2. FREQUENCY RESPONSE vs SUPPLY VOLTAGE

100

80
60
40
20

-20

-40

-60

INPUT OFFSET VOLTAGE (µV)

-80

-100

V

= VDD/2

CM

V

= 5V

0

V

= 2.5V

DD

05

1324

OUTPUT VOLTAGE (V)

DD

0

-20

-40

-60

-80

INPUT OFFSET VOLTAGE (µV)

-100

VOS, µV

05

1324

COMMON-MODE INPUT VOLTAGE (V)

FIGURE 3. INPUT OFFSET VOLTAGE vs OUTPUT VOLTAGE FIGURE 4. INPUT OFFSET VOLTAGE vs COMMON-MODE

INPUT VOLTAGE

4

FN6145.1

September 28, 2006