ISL28291FRUZ-T7 - INTERSIL

Single and Dual Single Supply Ultra-Low Noise, Low

Distortion Rail-to-Rail Output, Op Amp

ISL28191, ISL28291

The ISL28191 and ISL28291 are tiny single and dual ultra-low

noise, ultra-low distortion operational amplifiers. They are fully

specified to operate down to +3V single supply. These

amplifiers have outputs that swing rail-to-rail and an input

common mode voltage that extends to ground (ground

sensing).

The ISL28191 and ISL28291 are unity gain stable with an

input referred voltage noise of 1.7nV/√Hz. Both parts feature

0.00018% THD+N at 1kHz.

The ISL28191 is available in the space-saving 6 Ld UTDFN

(1.6mmx1.6mm) and 6 Ld SOT-23 packages. The ISL28291 is

available in the 8 Ld SOIC, 10 Ld 1.8mmx1.4mm UTQFN and

10 Ld MSOP packages. All devices are guaranteed over -40°C

to +125°C.

Features

•1.7nV/√Hz input voltage noise at 1kHz

• 1kHz THD+N typical 0.00018% at 2VP-P VOUT

• Harmonic Distortion -76dBc, -70dBc, fo = 1MHz

• 61MHz -3dB bandwidth

• 630µV maximum offset voltage

• 3µA input bias current

• 100dB typical CMRR

• 3V to 5.5V single supply voltage range

• Rail-to-rail output

•Ground Sensing

• Enable pin (not available in the 8 Ld SOIC package option)

• Pb-free (RoHS compliant)

Applications

• Low noise signal processing

• Low noise microphones/preamplifiers

•ADC buffers

• DAC output amplifiers

• Digital scales

• Strain gauges/sensor amplifiers

• Radio systems

• Portable equipment

• Infrared detectors

Related Literature

•AN1343: ISL2829xEVAL1Z, ISL5529xEVAL1Z Evaluation

Board User’s Guide

Ordering Information

PART NUMBER

(Note 5)

PART

MARKING

PACKAGE

(Pb-free)

PKG.

DWG. #

ISL28191FHZ-T7 (Notes 1, 2) GABJ 6 Ld SOT-23

(Note 4)

P6.064A

ISL28191FRUZ-T7 (Notes 1, 3) M8 6 Ld UTDFN L6.1.6x1.6A

ISL28291FUZ (Note 2) 8291Z 10 Ld MSOP M10.118A

ISL28291FUZ-T7 (Notes 1, 2) 8291Z 10 Ld MSOP M10.118A

ISL28291FBZ (Note 2) 28291 FBZ 8 Ld SOIC M8.15E

ISL28291FBZ-T7 (Notes 1, 2) 28291 FBZ 8 Ld SOIC M8.15E

ISL28291FRUZ-T7 (Notes 1, 3) F 10 Ld UTQFN L10.1.8x1.4A

ISL28191EVAL1Z Evaluation Board

ISL28291EVAL1Z Evaluation Board

NOTES:

1. Please refer to TB347 for details on reel specifications.

2. 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.

3. These Intersil Pb-free plastic packaged products employ special Pb-

free material sets; molding compounds/die attach materials and

NiPdAu plate - e4 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.

4. The part marking is located on the bottom of the part.

5. For Moisture Sensitivity Level (MSL), please see device information

page for ISL28191, ISL28291. For more information on MSL please

see techbrief TB363.

January 26, 2012

FN6156.9

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

Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.

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

ISL28191, ISL28291

2FN6156.9

January 26, 2012

Pin Configurations

ISL28191

(6 LD SOT-23)

TOP VIEW

ISL28191

(6 LD 1.6X1.6X0.5 UTDFN)

TOP VIEW

ISL28291

(8 LD SOIC)

TOP VIEW

ISL28291

(10 LD MSOP)

TOP VIEW

ISL28291

(10 LD UTQFN)

TOP VIEW

OUT

V-

IN+

V +

IN-

OUT

IN-

IN+

V+

V-

OUT_A

IN-_A

IN+_A

V-

V+

OUT_B

IN-_B

IN+_B

5 6

OUT_A

IN-_A

IN+_A

V-

V+

OUT_B

IN-_B

IN+_B

EN_A EN_B

IN+_B

IN-_B

OUT_B

V+

OUT_A

V-

EN_A

EN_B

IN+_A

IN-_A

543

ISL28191, ISL28291

3FN6156.9

January 26, 2012

Pin Descriptions

ISL28191

(6 Ld SOT-23)

ISL28191

(6 Ld UTDFN)

ISL28291

(8 Ld SOIC)

ISL28291

(10 Ld MSOP)

ISL28291

(10 Ld UTQFN)

NAME FUNCTION EQUIVALENT CIRCUIT

2 (A)

6 (B)

2 (A)

8 (B)

1 (A)

7 (B)

IN-

IN-_A

IN-_B

Inverting input

Circuit 1

3 (A)

5 (B)

3 (A)

7 (B)

2 (A)

6 (B)

IN+

IN+_B

Non-inverting

input

(See circuit 1)

2 4 4 4 3 V- Negative supply

1 (A)

7 (B)

1 (A)

9 (B)

10 (A)

8 (B)

OUT

OUT_A

OUT_B

Output

Circuit 2

6 6 8 10 9 V+ Positive supply

55N/A

5 (A)

6 (B)

4 (A)

5 (B)

EN_A

EN_B

Enable BAR

pin internal

pull-down; Logic

“1” selects the

disabled state;

Logic “0” selects

the enabled

state. Circuit 3

IN+IN-

V+

V-

V+

V-

OUT

V+

V-

ISL28191, ISL28291

4FN6156.9

January 26, 2012

Absolute Maximum Ratings (TA = +25°C) Thermal Information

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .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

Charged Device Model (CDM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1200V

Operating Conditions

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

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

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3V to 5.5V

Thermal Resistance (Typical, Note 6) θJA (°C/W)

6 Ld SOT-23 Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . 230

6 Ld UTDFN Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

8 Ld SOIC Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

10 Ld MSOP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . 150

10 Ld UTQFN Package . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

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

NOTE:

6. θJA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.

Electrical Specifications V+ = 5.0V, V- = GND, RL = Open, RF = 1kΩ, AV = -1 unless otherwise specified. Parameters are per

amplifier. Typical values are at V+= 5V, TA = +25°C. Boldface limits apply over the operating temperature range, -40°C to +125°C.

PARAMETER DESCRIPTION CONDITIONS

MIN

(Note 7) TYP

MAX

(Note 7) UNIT

DC SPECIFICATIONS

VOS Input Offset Voltage 270 630

840

µV

Input Offset Drift vs Temperature Figure 21 3.1 µV/°C

IIO Input Offset Current 35 500

900

IBInput Bias Current 36

µA

CMIR Common-Mode Input Range 03.8V

CMRR Common-Mode Rejection Ratio VCM = 0V to 3.8V 78 100 dB

PSRR Power Supply Rejection Ratio VS = 3V to 5V 74 80 dB

AVOL Large Signal Voltage Gain VO = 0.5V to 4V, RL = 1kΩ90

98 dB

VOUT Maximum Output Voltage Swing Output low, RL = 1kΩ20 50

Output high, RL = 1kΩ, V+ = 5V 4.95

4.92

4.97 V

IS,ON Supply Current per Amplifier, Enabled 2.6 3.5

3.9

IS,OFF Supply Current per Amplifier, Disabled 26 35

µA

IO+ Short-Circuit Output Current RL = 10Ω95

130 mA

IO- Short-Circuit Output Current RL = 10Ω95

130 mA

VSUPPLY Supply Operating Range V+ to V- 3 5.5 V

ΔVOS

ΔT

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

ISL28191, ISL28291

5FN6156.9

January 26, 2012

VENHEN High Level Referred to V- 2 V

VENLEN Low Level Referred to V- 0.8 V

IENHEN Pin Input High Current VEN = V+ 0.8 1.1

1.3

µA

IENLEN Pin Input Low Current VEN = V- 20 80

100

AC SPECIFICATIONS

GBW -3dB Unity Gain Bandwidth RF = 0Ω, CL = 20pF, AV = 1, RL = 10kΩ61 MHz

THD+N Total Harmonic Distortion + Noise f = 1kHz. VOUT + 2VP-P, AV = +1, RL = 10kΩ0.0001

(1MHz)

2nd Harmonic Distortion 2VP-P output voltage, AV = 1 -76 dBc

3rd Harmonic Distortion -70 dBc

ISO Off-state Isolation

fO = 100kHz

AV = +1, VIN = 100mVP-P

, RF = 0Ω

CL = 20pF, AV = 1, RL = 10kΩ

-38 dB

X-TALK

ISL28291

Channel-to-Channel Crosstalk

fO = 100kHz

VS = ±2.5V, AV = +1, VIN = 1VP-P,

RF = 0Ω, CL = 20pF, AV = 1, RL = 10kΩ

-105 dB

PSRR Power Supply Rejection Ratio

fO = 100kHz

VS = ±2.5V, AV = +1, VSOURCE = 1VP-P

RF = 0Ω, CL = 20pF, AV = 1, RL = 10kΩ

-70 dB

CMRR Common Mode Rejection Ratio

fO = 100kHz

VS = ±2.5V, AV = +1, VCM = 1VP-P,

RF = 0Ω, CL = 20pF, AV = 1, RL = 10kΩ

-65 dB

enInput Referred Voltage Noise fO = 1kHz 1.7 nV/√Hz

inInput Referred Current Noise fO = 1kHz 1.8 pA/√Hz

TRANSIENT RESPONSE

SR Slew Rate 12

17 V/µs

tr, tf, Small

Signal

Rise Time, tr 10% to 90% AV = 1, VOUT = 0.1VP-P, RL = 10kΩ, CL = 1.2pF 7ns

Fall Time, tf 90% to 10% 12 ns

tr, tf Large Signal Rise Time, tr 10% to 90% AV = 2, VOUT = 1VP-P; RL = 10kΩ,

RF /RG = 499Ω/499Ω, CL = 1.2pF

44 ns

Fall Time, tf 90% to 10% 50 ns

Rise Time, tr 10% to 90% AV = 2, VOUT = 4.7VP-P; RL = 10kΩ,

RF /RG = 499Ω/499Ω, CL = 1.2pF

190 ns

Fall Time, tf 90% to 10% 190 ns

tEN ENABLE to Output Turn-on Delay Time;

10% EN - 10% VOUT

AV = 1, VOUT = 1VDC, RL = 10kΩ, CL = 1.2pF 330 ns

ENABLE to Output Turn-off Delay

Time; 10% EN - 10% VOUT

AV = 1, VOUT = 0VDC, RL = 10kΩ, CL = 1.2pF 50 ns

NOTE:

7. Compliance to datasheet limits is assured by one or more methods: production test, characterization and/or design.

Electrical Specifications V+ = 5.0V, V- = GND, RL = Open, RF = 1kΩ, AV = -1 unless otherwise specified. Parameters are per

amplifier. Typical values are at V+= 5V, TA = +25°C. Boldface limits apply over the operating temperature range, -40°C to +125°C. (Continued)

PARAMETER DESCRIPTION CONDITIONS

MIN

(Note 7) TYP

MAX

(Note 7) UNIT

ISL28191, ISL28291

6FN6156.9

January 26, 2012

Typical Performance Curves

FIGURE 1. GAIN vs FREQUENCY FOR VARIOUS RLOAD FIGURE 2. GAIN vs FREQUENCY FOR VARIOUS CLOAD

FIGURE 3. -3dB BANDWIDTH vs VOUT FIGURE 4. FREQUENCY RESPONSE vs CLOSED LOOP GAIN

FIGURE 5. INPUT IMPEDANCE vs FREQUENCY FIGURE 6. DISABLED OUTPUT IMPEDANCE vs FREQUENCY

-7

-6

-5

-4

-3

-2

-1

10k 100k 1M 10M 100M

FREQUENCY (Hz)

CLOSED LOOP GAIN (dB)

RL = 100k

V+ = 5V

AV = +1

CL = 10pF

VOUT = 10mVP-P

RL = 10k

RL = 1k

RL = 100

-10

-8

-6

-4

-2

10k 100k 1M 10M 100M

CL = 20pF

CL = 10pF

CL = 32pF

CL = 57pF

CL = 110pF

CLOSED LOOP GAIN (dB)

V+ = 5V

AV = +1

RL = 10kΩ

VOUT = 10mVP-P

FREQUENCY (Hz)

-7

-6

-5

-4

-3

-2

-1

10k 100k 1M 10M 100M

FREQUENCY (Hz)

CLOSED LOOP GAIN (dB)

V+ = 5V

AV = +1

RL = 10kΩ

CL = 10pF

-8

VOUT = 10mVP-P

VOUT = 100mVP-P

OUT

= 1V

P-P

VOUT = 1mVP-P

-10

10k 100k 1M 10M 100M

FREQUENCY (Hz)

GAIN (dB)

V+ = 5V

RL = 10k

VOUT = 100mVP-P

AV = 10, RF = 4.42k, RG = 499

AV = 100, RF = 49.9k,

AV = 1, RF = 0, RG = INF

AV = 1000, RF = 499k, RG = 499

RG = 499

100

10k

100k

10k 100k 1M 10M 100M

V+ = 5V, 3V

INPUT IMPEDANCE (Ω)

FREQUENCY (Hz)

ENABLED AND

DISABLED

VSOURCE = 1VP-P

100

10k

100k

10k 100k 1M 10M 100M

FREQUENCY (Hz)

OUTPUT IMPEDANCE (Ω)

V+ = 5V, 3V

VSOURCE = 1VP-P

ISL28191, ISL28291

7FN6156.9

January 26, 2012

FIGURE 7. ENABLED OUTPUT IMPEDANCE vs FREQUENCY FIGURE 8. CMRR vs FREQUENCY

FIGURE 9. PSRR vs FREQUENCY FIGURE 10. OFF ISOLATION vs FREQUENCY

FIGURE 11. CHANNEL TO CHANNEL CROSSTALK vs FREQUENCY FIGURE 12. THD+N vs FREQUENCY

Typical Performance Curves (Continued)

FREQUENCY (Hz)

0.10

100

10k 100k 1M 10M 100M

OUTPUT IMPEDANCE (Ω)

V+ = 5V, 3V

VSOURCE = 1V

VSOURCE = 0.1V

CMRR (dB)

-20

-40

-60

-80

-100

-10

-30

-50

-70

-90

1k 10k 1M

FREQUENCY (Hz)

100k 100M10M

V+ = 5V

AV = +1

RL = 10kΩ

CL = 10pF

VOUT = 100mVP-P

PSRR (dB)

FREQUENCY (Hz)

-20

-40

-60

-80

-100

-10

-30

-50

-70

-90

1k 10k 1M100k 100M10M

PSRR+

PSRR-

V+ = 5V

AV = +1

RL = 10kΩ

CL = 10pF

VOUT = 100mVP-P

-80

-70

-60

-50

-40

-30

-20

-10

10k 100k 1M 10M 100M 1G

VP-P = 10mV

VP-P = 1V

VP-P = 100mV

OFF ISOLATI ON (d B)

V+ = 5V

AV = +1

RL = 10kΩ

CL = 10pF

FREQUENCY (Hz)

-120

-110

-100

-90

-80

-70

-60

-50

-40

-30

10k 100k 1M 10M 100M 1G

VP-P = 1V

CROSSTALK (dB)

FREQUENCY (Hz)

0.0001

0.001

0.01

0.1

0 2k 4k 6k 8k 10k 12k 14k 16k 18k 20k

FREQUENCY (Hz)

THD + NOISE (%)

V+ = 5V

RL = 10k

RF = 0, AV = 1

400Hz TO 22kHz FILTER

VOUT = 2VP-P

ISL28191, ISL28291

8FN6156.9

January 26, 2012

FIGURE 13. THD+N @ 1kHz vs VOUT FIGURE 14. INPUT REFERRED NOISE VOLTAGE vs FREQUENCY

FIGURE 15. INPUT REFERRED NOISE CURRENT vs FREQUENCY FIGURE 16. ENABLE/DISABLE TIMING

FIGURE 17. SMALL SIGNAL STEP RESPONSE FIGURE 18. LARGE SIGNAL (1V) STEP RESPONSE

Typical Performance Curves (Continued)

0.0001

0.001

0.01

0.1

0 0.5 1.0 1.5 2.0 2.5 3.0 3.5

VOUT (VP-P)

THD +NOISE (%)

V+ = 5V

AV = +1

RL = 10kΩ

FREQUENCY = 1kHz

FILTER = 400Hz TO 22kHz

1 10 100 1k 10k

FREQUENCY (Hz)

INPUT VOLTAGE NOISE (nV/

√

Hz)

100k

0.1

CURRENT NOISE (pA/√Hz)

1 10 100 1k 10k

FREQUENCY (Hz)

100k0.1

100

-1 0 1 2 3 4

EN INPUT

OUTPUT

VOLTS (V)

TIME (µs)

V+ = 5V

AV = +1

RL = 10kΩ

CL = 10pF

VIN = 1VDC

ENABLEDISABLEENABLE

SMALL SIGNAL (V)

TIME (ns)

-0.08

-0.06

-0.04

-0.02

0.02

0.04

0.06

0.08

0 20 40 60 80 100 120 140 160 180 200

VIN

VOUT

V+ = ±2.5V

AV = +1

RL = 10kΩ

VOUT = 100mVP-P

LARGE SIGNAL (V)

-0.8

-0.6

-0.4

-0.2

0.2

0.4

0.6

0.8

TIME (ns)

0 100 200 300 400 500 600 700 800

VIN

VOUT

V+ = ±2.5V

AV = +2

RF = RG = 499Ω

RL = 10kΩ

VOUT = 1VP-P

ISL28191, ISL28291

9FN6156.9

January 26, 2012

FIGURE 19. LARGE SIGNAL (4.7V) STEP RESPONSE FIGURE 20. SUPPLY CURRENT vs TEMPERATURE,

VS = ±2.5V ENABLED, RL = INF

FIGURE 21. VOS vs TEMPERATURE, VS = ±2.5V FIGURE 22. IBIAS+ vs TEMPERATURE, VS = ±2.5V

FIGURE 23. IBIAS- vs TEMPERATURE, VS = ±2.5V FIGURE 24. IIO vs TEMPERATURE, VS = ±2.5V

Typical Performance Curves (Continued)

LARGE SIGNAL (V)

-3

-2

-1

0 400 800 1200 1600 2000

VIN

VOUT

V+ = ±2.5V

AV = +2

RF = RG = 499Ω

RL = 10kΩ

VOUT = 4.7VP-P

TIME (ns)

1.5

1.7

1.9

2.1

2.3

2.5

2.7

2.9

3.1

3.3

3.5

-40 -20 0 20 40 60 80 100 120

TEMPERATURE (°C)

CURRENT (mA)

n = 100

MEDIAN

MIN

MAX

-200

-100

100

200

300

400

500

600

700

800

-40-200 20406080100120

TEMPERATURE (°C)

VOS (µV)

n = 100

MEDIAN

MIN

MAX

-4.6

-4.4

-4.2

-4.0

-3.8

-3.6

-3.4

-3.2

-3.0

-40 -20 0 20 40 60 80 100 120

TEMPERATURE (°C)

IBIAS+ (µA)

n = 100

MEDIAN

MIN

MAX

-5.0

-4.8

-4.6

-4.4

-4.2

-4.0

-3.8

-3.6

-3.4

-3.2

-3.0

-40 -20 0 20 40 60 80 100 120

TEMPERATURE (°C)

IBIAS- (µA)

n = 100

MEDIAN

MIN

MAX

-400

-200

200

400

600

800

-40 -20 0 20 40 60 80 100 120

TEMPERATURE (°C)

IIO (nA)

n = 100

MEDIAN

MIN

MAX

ISL28191, ISL28291

10 FN6156.9

January 26, 2012

FIGURE 25. CMRR vs TEMPERATURE, VCM = 3.8V,

VS = ±2.5V

FIGURE 26. PSRR vs TEMPERATURE ±1.5V TO ±2.5V

FIGURE 27. POSITIVE VOUT vs TEMPERATURE, RL = 1k

VS=±2.5V

FIGURE 28. NEGATIVE VOUT vs TEMPERATURE, RL = 1k

VS= ±2.5V

FIGURE 29. INPUT COMMON MODE VOLTAGE vs TEMPERATURE

Typical Performance Curves (Continued)

100

110

120

130

140

150

160

-40 -20 0 20 40 60 80 100 120

TEMPERATURE (°C)

CMRR (dB)

n = 100

MEDIAN

MIN

MAX

-40-200 20406080100120

TEMPERATURE (°C)

PSRR (dB)

n = 100

MEDIAN

MIN

MAX

4.960

4.965

4.970

4.975

4.980

4.985

4.990

-40 -20 0 20 40 60 80 100 120

TEMPERATURE (°C)

VOUT (V)

n = 100

MEDIAN

MIN

MAX

-40-200 20406080100120

TEMPERATURE (°C)

VOUT (mV)

n = 100

MEDIAN

MIN

MAX

0.2

0.4

0.6

0.8

1.0

1.2

-0.8

-0.6

-0.4

-0.2

-60 -40 -20 0 20 40 60 80 100 120 140

TEMPERATURE (°C)

INPUT VOLTAGE TO THE POSITIVE RAIL (V+ - VCM)

INPUT VOLTAGE TO THE NEGATIVE RAIL (V- + VCM)

VCM OVERHEAD TO SUPPLY RAILS (V)

ISL28191, ISL28291

11 FN6156.9

January 26, 2012

Applications Information

Product Description

The ISL28191 and ISL28291 are voltage feedback operational

amplifiers designed for communication and imaging applications

requiring low distortion, very low voltage and current noise. Both

parts feature high bandwidth while drawing moderately low supply

current. They use a classical voltage-feedback topology, which

allows them to be used in a variety of applications where current-

feedback amplifiers are not appropriate because of restrictions

placed upon the feedback element used with the amplifier.

Enable/Power-Down

The ISL28191 and ISL28291 amplifiers are disabled by applying

a voltage greater than 2V to the EN pin, with respect to the V- pin.

In this condition, the output(s) will be in a high impedance state

and the amplifier(s) current will be reduced to 13µA/Amp. By

disabling the part, multiple parts can be connected together as a

MUX. The outputs are tied together in parallel and a channel can

be selected by the EN pin. The EN pin also has an internal pull-

down. If left open, the EN pin will pull to the negative rail and the

device will be enabled by default.

Input Protection

All input terminals have internal ESD protection diodes to both

positive and negative supply rails, limiting the input voltage to

within one diode beyond the supply rails. Both parts have

additional back-to-back diodes across the input terminals (as

shown in Figure 30). In pulse applications where the input Slew

Rate exceeds the Slew Rate of the amplifier, the possibility exists

for the input protection diodes to become forward biased. This can

cause excessive input current and distortion at the outputs. If

overdriving the inputs is necessary, the external input current must

never exceed 5mA. An external series resistor may be used to limit

the current, as shown in Figure 30.

Using Only One Channel

The ISL28291 is a dual channel op amp. If the application only

requires one channel when using the ISL28291, the user must

configure the unused channel to prevent it from oscillating.

Oscillation can occur if the input and output pins are floating. This

will result in higher than expected supply currents and possible

noise injection into the channel being used. The proper way to

prevent this oscillation is to short the output to the negative input

and ground the positive input (as shown in Figure 31).

Power Supply Bypassing and Printed Circuit

Board Layout

As with any high frequency device, good printed circuit board

layout is necessary for optimum performance. Low impedance

ground plane construction is essential. Surface mount

components are recommended, but if leaded components are

used, lead lengths should be as short as possible. The power

supply pins must be well bypassed to reduce the risk of

oscillation. The combination of a 4.7µF tantalum capacitor in

parallel with a 0.01µF capacitor has been shown to work well

when placed at each supply pin.

For good AC performance, parasitic capacitance should be kept

to a minimum, especially at the inverting input. When ground

plane construction is used, it should be removed from the area

near the inverting input to minimize any stray capacitance at that

node. Carbon or Metal-Film resistors are acceptable with the

Metal-Film resistors giving slightly less peaking and bandwidth

because of additional series inductance. Use of sockets,

particularly for the SOIC package, should be avoided if possible.

Sockets add parasitic inductance and capacitance, which will

result in additional peaking and overshoot.

Current Limiting

The ISL28191 and ISL28291 have no internal current-limiting

circuitry. If the output is shorted, it is possible to exceed the

Absolute Maximum Rating for output current or power dissipation,

potentially resulting in the destruction of the device. This is why the

output short circuit current is specified and tested with RL = 10Ω.

FIGURE 30. LIMITING THE INPUT CURRENT TO LESS THAN 5mA

FIGURE 31. PREVENTING OSCILLATIONS IN UNUSED CHANNELS

ISL28191, ISL28291

Intersil products are manufactured, assembled and tested utilizing ISO9000 quality systems as noted

in the quality certifications found at www.intersil.com/design/quality

Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time

without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be

accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third

parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.

For information regarding Intersil Corporation and its products, see www.intersil.com

FN6156.9

January 26, 2012

For additional products, see www.intersil.com/product_tree

Power Dissipation

It is possible to exceed the +125°C maximum junction

temperatures under certain load and power-supply conditions. It

is therefore important to calculate the maximum junction

temperature (TJMAX) for all applications to determine if power

supply voltages, load conditions, or package type need to be

modified to remain in the safe operating area. These parameters

are related in Equation 1:

where:

•P

DMAXTOTAL is the sum of the maximum power dissipation of

each amplifier in the package (PDMAX)

•PD

MAX for each amplifier can be calculated in Equation 2:

where:

•T

MAX = Maximum ambient temperature

•θJA = Thermal resistance of the package

•PD

MAX = Maximum power dissipation of 1 amplifier

•V

S = Supply voltage

•I

MAX = Maximum supply current of 1 amplifier

•V

OUTMAX = Maximum output voltage swing of the application

•R

L = Load resistance

TJMAX TMAX θJAxPDMAXTOTAL

()+= (EQ. 1)

PDMAX 2*VSISMAX VS

( - VOUTMAX )VOUTMAX

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

×+×=

(EQ. 2)

ISL28191, ISL28291

13 FN6156.9

January 26, 2012

Products

Intersil Corporation is a leader in the design and manufacture of high-performance analog semiconductors. The Company's products

address some of the industry's fastest growing markets, such as, flat panel displays, cell phones, handheld products, and notebooks.

Intersil's product families address power management and analog signal processing functions. Go to www.intersil.com/products for a

complete list of Intersil product families.

For a complete listing of Applications, Related Documentation and Related Parts, please see the respective device information page on

intersil.com: ISL28191,ISL28291

To report errors or suggestions for this datasheet, please go to: www.intersil.com/askourstaff

FITs are available from our website at: http://rel.intersil.com/reports/search.php

Revision History

The revision history provided is for informational purposes only and is believed to be accurate, but not warranted. Please go to web to make sure you

have the latest revision.

DATE REVISION CHANGE

January 18, 2012 FN6156.9 Page 1 - Ordering Information Update:

Added Eval Board ISL28191EVAL1Z

Changed micro TDFN and TQFN to Ultra matching POD Description

Added SOT-23 Note

Page 10 - Typical Performance Curves:

Added Figure 29 - INPUT COMMON MODE VOLTAGE vs TEMPERATURE

ISL28191, ISL28291

14 FN6156.9

January 26, 2012

Package Outline Drawing

P6.064A

6 LEAD SMALL OUTLINE TRANSISTOR PLASTIC PACKAGE

Rev 0, 2/10

1.60

0.08-0.20

SEE DETAIL X

(0.60)

0-3°

3 5

DETAIL "X"

SIDE VIEW

TYPICAL RECOMMENDED LAND PATTERN

TOP VIEW END VIEW

INDEX AREA

PIN 1

SEATING PLANE GAUGE

0.45±0.1

(2 PLCS)

10° TYP

1.90

0.40 ±0.05

2.90

0.95

2.80

0.05-0.15

1.14 ±0.15

0.20 CA-B DM

(1.20)

(0.60)

(0.95)

(2.40)

0.10 C

1.45 MAX

0.20 C

(1.90)

0.15 C

2x D

0.15 C

2x A-B

(0.25)

PLANE

Dimension is exclusive of mold flash, prot rusions or gate burrs.

This dimension is measured at Datum “H”.

Package conforms to JEDEC MO-178AA.

Foot length is measured at reference to guage plane.

Dimensions in ( ) for Reference Only.

Dimensioning and tolerancing conform to ASME Y14.5M-1994.

Dimensions are in mill imeters.1.

NOTES:

ISL28191, ISL28291

15 FN6156.9

January 26, 2012

Ultra Thin Dual Flat No-Lead Plastic Package (UTDFN)

0.15 C

PIN 1

TOP VIEW

0.15 C

REFERENCE

DETAIL A

0.10 C

0.08 C

A3 C

SEATING

PLANE

BOTT OM VIEW

SIDE VIEW

0.10 CAB

b6X

DETAIL A

0.127 +0.058

0.127±0.008

CO.2

1.00 REF

DAP SIZE 1.30 x 0.76

-0.008

TERMINAL THICKNESS

0.30

1.00 0.45

0.50

0.25

1.25

2.00

1.00

LAND PATTERN

L6.1.6x1.6A

6 LEAD ULTRA THIN DUAL FLAT NO-LEAD PLASTIC PACKAGE

SYMBOL

MILLIMETERS

NOTESMIN NOMINAL MAX

0.45 0.50 0.55

- - 0.05

0.127 REF

0.15 0.20 0.25

1.55 1.60 1.65

D2 0.40 0.45 0.50 -

1.55 1.60 1.65

0.95 1.00 1.05

0.50 BSC

0.25 0.30 0.35

Rev. 1 6/06

NOTES:

1. Dimensions are in mm. Angles in degrees.

2. Coplanarity applies to the exposed pad as well as the terminals.

Coplanarity shall not exceed 0.08mm.

3. Warpage shall no t exceed 0.10mm.

4. Package length/package width are considered as special

characteristics.

5. JEDEC Reference MO-229.

6. For additional information, to assist with the PCB Land Pattern

Design effort, see Intersil Technical Brief TB389.

ISL28191, ISL28291

16 FN6156.9

January 26, 2012

Package Outline Drawing

M8.15E

8 LEAD NARROW BODY SMALL OUTLINE PLASTIC PACKAGE

Rev 0, 08/09

Unless otherwise specified, tolerance : Decimal ± 0.05

The pin #1 identifier may be either a mold or mark feature.

Interlead flash or protrusions shall not exceed 0.25mm per side.

Dimension does not include interlead flash or protrusions.

Dimensions in ( ) for Reference Only.

Dimensioning and tolerancing conform to AMSE Y14.5m-1994.

Dimensions are in millimeters.1.

NOTES:

DETAIL "A"

SIDE VIEW “A

TYPICAL RECOMMENDED LAND PATTERN

TOP VIEW

0.25 AMC B

0.10 C

ID MARK

PIN NO.1

(0.35) x 45°

SEATING PLANE

GAUGE PLANE

0.25

(5.40)

(1.50)

4.90 ± 0.10

3.90 ± 0.10

1.27 0.43 ± 0.076

0.63 ±0.23

4° ± 4°

DETAIL "A" 0.22 ± 0.03

0.175 ± 0.075

1.45 ± 0.1

1.75 MAX

(1.27) (0.60)

6.0 ± 0.20

Reference to JEDEC MS-012.

SIDE VIEW “B”

ISL28191, ISL28291

17 FN6156.9

January 26, 2012

Package Outline Drawing

L10.1.8x1.4A

10 LEAD ULTRA THIN QUAD FLAT NO-LEAD PLASTIC PACKAGE

Rev 5, 3/10

located within the zone indicated. The pin #1 identifier may be

Unless otherwise specified, tolerance : Decimal ± 0.05

JEDEC reference MO-255.

The configuration of the pin #1 identifier is optional, but must be

between 0.15mm and 0.30mm from the terminal tip.

Dimension applies to the metallized terminal and is measured

Dimensions in ( ) for Reference Only.

Dimensioning and tolerancing conform to ASME Y14.5m-1994.

either a mold or mark feature.

Dimensions are in millimeters.1.

NOTES:

BOTTOM VIEW

DETAIL "X"

SIDE VIEW

TYPICAL RECOMMENDED LAND PATTERN

TOP VIEW

0.08

SEATING PLANE

0.10 C

SEE DETAIL "X"

MAX. 0.55

0 .1 27 REF

0-0.05

0.10

1.40

1.80

6X 0.40

0.10 M

MAB

0.70

PIN #1 ID

INDEX AREA

PIN 1 0.50

10X 0.20

4X 0.30

0.05

9 X 0.40

(6X 0.40)

(0.70)

10 (0.70)

(10X 0.20)

(4X 0.30)

(9 X 0.60)

PACKAGE OUTLINE

ISL28191, ISL28291

18 FN6156.9

January 26, 2012

Package Outline Drawing

M10.118A (JEDEC MO-187-BA)

10 LEAD MINI SMALL OUTLINE PLASTIC PACKAGE (MSOP)

Rev 0, 9/09

Plastic or metal protrusions of 0.15mm max per side are not

Dimensions “D” and “E1” are measured at Datum Plane “H”.

This replaces existing drawing # MDP0043 MSOP10L.

Plastic interlead protrusions of 0.25mm max per side are not

Dimensioning and tolerancing conform to AMSE Y14.5m-1 994.

Dimensions are in millimeters.1.

NOTES:

DETAIL "X"

SIDE VIEW 1

TYPICAL RECOMMENDED LAND PATTERN

TOP VIEW

Gauge

Plane

3°±3°

0.25

0.25 CAB

0.10C

0.08 CAB

0.55 ± 0.1 5

0.95 BSC

0.18 ± 0.05

1.10 Max

5.80

3.00

4.40

0.50

0.30

1.40

PIN# 1 ID

1 2

10 DETAIL "X"

SEATING PLANE

0.5 BSC

0.23 +0.07/ -0.08

3.0 ± 0.1

4.9 ± 0.15

3.0 ± 0.1

0.10 ± 0.05

0.86 ± 0.09

SIDE VIEW 2

included.