opa37

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OPA27, 37

FEATURES LOW NOISE: 4.5nV/Hz max at 1kHz LOW OFFSET: 100V max LOW DRIFT: 0.4V/C HIGH OPEN-LOOP GAIN: 117dB min

HIGH COMMON-MODE REJECTION:100dB min

HIGH POWER SUPPLY REJECTION:94dB min

FITS OP-07, OP-05, AD510, AD517SOCKETS

Ultra-Low Noise PrecisionOPERATIONAL AMPLIFIERS

APPLICATIONS PRECISION INSTRUMENTATION

DATA ACQUISITION

TEST EQUIPMENT

PROFESSIONAL AUDIO EQUIPMENT

TRANSDUCER AMPLIFIER

RADIATION HARD EQUIPMENT

DESCRIPTIONThe OPA27/37 is an ultra-low noise, high precision

monolithic operational amplifier.

Laser-trimmed thin-film resistors provide excellent

long-term voltage offset stability and allow superior

voltage offset compared to common zener-zap tech-

niques.

A unique bias current cancellation circuit allows bias

and offset current specifications to be met over the full

55C to +125C temperature range.

The OPA27 is internally compensated for unity-gain

stability. The decompensated OPA37 requires a closed-

loop gain 5.

The Burr-Brown OPA27/37 is an improved replace-

ment for the industry-standard OP-27/OP-37.

OPA27OPA37

Output

+VCC

VCC

+In

In

Trim

Trim8

7

6

4

1

2

3

International Airport Industrial Park Mailing Address: PO Box 11400, Tucson, AZ 85734 Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 Tel: (520) 746-1111 Twx: 910-952-1111

Internet: http://www.burr-brown.com/ FAXL ine: (800) 548-6133 (US/Canada Only) Cable: BBRCORP Telex: 066-6491 FAX: (520) 889-1510 Im mediate Product Info: (800) 548-6132

OPA27

OPA27

1984 Burr-Brown Corporation PDS-466M Printed in U.S.A. March, 1998

SBOS135

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OPA27, 37

SPECIFICATIONSAt VCC = 15V and TA= +25C, unless otherwise noted.

OPA27/37G

PARAMETER CONDITIONS MIN TYP MAX UNITS

INPUT NOISE (6)

Voltage, fO= 10Hz 3.8 8.0 nV/ HzfO= 30Hz 3.3 5.6 nV/ HzfO= 1kHz 3.2 4.5 nV/ HzfB= 0.1Hz to 10Hz 0.09 0.25 Vp-p

Current,(1)fO= 10Hz 1.7 pA/ HzfO= 30Hz 1.0 pA/ HzfO= 1kHz 0.4 0.6 pA/ Hz

OFFSET VOLTAGE (2)

Input Offset Voltage 25 100 VAverage Drift (3) TA MIN to TA MAX 0.4 1.8 (6) V/CLong Term Stability (4) 0.4 2.0 V/mo

Supply Rejection VCC = 4 to 18V 94 120 dBVCC = 4 to 18V 1 20 V/V

BIAS CURRENT

Input Bias Current 15 80 nA

OFFSET CURRENT

Input Offset Current 10 75 nA

IMPEDANCE

Common-Mode 2 || 2.5 G|| pF

VOLTAGE RANGE

Common-Mode Input Range 11 12.3 VCommon-Mode Rejection VIN = 11VDC 100 122 dB

OPEN-LOOP VOLTAGE GAIN, DC RL2k 117 124 dBRL1k 124 dB

FREQUENCY RESPONSE

Gain-Bandwidth Product (5) OPA27 5 (6) 8 MHz

OPA37 45 (6) 63 MHz

Slew Rate (5) VO= 10V,RL= 2k

OPA27, G = +1 1.7 (6) 1.9 V/ sOPA37, G = +5 11(6) 11.9 V/ s

Settling Time, 0.01% OPA27, G = +1 25 sOPA37, G = +5 25 s

RATED OUTPUT

Voltage Output RL2k 12 13.8 VRL600 10 12.8 V

Output Resistance DC, Open Loop 70 Short Circuit Current RL= 0 25 60(6) mA

POWER SUPPLY

Rated Voltage 15 VDCVoltage Range,

Derated Performance 4 22 VDCCurrent, Quiescent IO= 0mADC 3.3 5.7 mA

TEMPERATURE RANGE

Specification 40 +85 COperating 40 +85 C

NOTES: (1) Measured with industry-standard noise test circuit (Figures 1 and 2). Due to errors introduced by this method, these current noise specifications should

be used for comparison purposes only. (2) Offset voltage specification are measured with automatic test equipment after approximately 0.5 seconds from power turn-

on. (3) Unnulled or nulled with 8kto 20kpotentiometer. (4) Long-term voltage offset vs time trend line does not include warm-up drift. (5) Typical specification onlyon plastic package units. Slew rate varies on all units due to differing test methods. Minimum specification applies to open-loop test. (6) This parameter guaranteed by

design.

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OPA27, 37

OPA27/37G

PARAMETER CONDITIONS MIN TYP MAX UNITS

INPUT VOLTAGE (1)

Input Offset Voltage 48 220(3) VAverage Drift (2) TA MIN to TA MAX 0.4 1.8(3) V/C

Supply Rejection VCC = 4.5 to 18VVCC= 4.5 to 18V 90 (3) 122 dB

BIAS CURRENT

Input Bias Current 21 150(3) nA

OFFSET CURRENT

Input Offset Current

E, F, G 20 135 (3) nA

VOLTAGE RANGE

Common-Mode Input Range 10.5(3) 11.8 VCommon-Mode Rejection VIN= 11VDC 96 (3) 122 dB

OPEN-LOOP GAIN, DC

Open-Loop Voltage Gain RL2k 113(3) 120 dB

RATED OUTPUT

Voltage Output RL= 2k 11.0(3) 13.4 VShort Circuit Current VO= 0VDC 25 mA

TEMPERATURE RANGE

Specification 40 +85 C

NOTES: (1) Offset voltage specification are measured with automatic test equipment after approximately 0.5s from power turn-on. (2) Unnulled or nulled with 8kto20kpotentiometer. (3) This parameter guaranteed by design.

SPECIFICATIONSAt VCC = 15V and TA= +25C, unless otherwise noted.

The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes

no responsibility for the use of this information, and all use of such information shall be entirely at the users own risk. Prices and specifications are subject to change

without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant

any BURR-BROWN product for use in life support devices and/or systems.

ABSOLUTE MAXIMUM RATINGS

Supply Voltage...................................................................................22VInternal Power Dissipation (1) ........................................................ 500mW

Input Voltage......................................................................................VCCOutput Short-Circuit Duration (2) ................................................. Indefinite

Differential Input Voltage(3) .............................................................0.7VDifferential Input Current (3) ...........................................................25mAStorage Temperature Range ..........................................55C to +125COperating Temperature Range .........................................40C to +85CLead Temperature:

P (soldering, 10s) ....................................................................... +300C

U (soldering, 3s) ......................................................................... +260C

PACKAGE TYPE JA UNITS

8-Pin Plastic DIP (P) 100 C/W8-Pin SOIC (U) 160 C/W

NOTES: (1) Maximum package power dissipation vs ambient temperature. (2) To

common with VCC= 15V. (3) The inputs are protected by back-to-back diodes.Current limiting resistors are not used in order to achieve low noise. If differential

input voltage exceeds 0.7V, the input current should be limited to 25mA.

ELECTROSTATICDISCHARGE SENSITIVITY

This integrated circuit can be damaged by ESD. Burr-Brown

recommends that all integrated circuits be handled with

appropriate precautions. Failure to observe proper handling

and installation procedures can cause damage.

ESD damage can range from subtle performance degradation

to complete device failure. Precision integrated circuits may

be more susceptible to damage because very small parametric

changes could cause the device not to meet its published

specifications.

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OPA27, 37

Top View P, U Packages

CONNECTION DIAGRAMS

1

2

3

4 5

6

7

8Offset Trim

+VCCIn

+In

VCC

Output

NC

Offset Trim

OFFSET PACKAGE

TEMPERATURE VOLTAGE DRAWING

PRODUCT(1) PACKAGE RANGE (C) MAX (V), 25C NUMBER(3)

OPA27GP Plastic 40 to +85 100 006OPA27GU(2) SOIC 40 to +85 100 182

NOTE: (1) Packages for OPA37 are same as for OPA27. (2) OPA27GU may

be marked OPA27U. Likewise, OPA37GU may be marked OPA37U. (3) For

detailed drawing and dimension table, please see end of data sheet, or

Appendix C of Burr-Brown IC Data Book.

PACKAGE/ORDERING INFORMATION

FIGURE 1. 0.1Hz to 10Hz Noise Test Circuit.

DUT

OPA111

100k

2k

4.7F

Voltage Gain

Total = 50,000

10

NOTE: All capacitor values are for nonpolarized capacitors only.

0.1F

Scope

x1RIN= 1M100k

24.3k

4.3k

110k0.1F

22F

2.2F

FIGURE 2. Low Frequency Noise.

0.1Hz TO 10Hz NOISE

1s/div 40nV/div

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OPA27, 37

TYPICAL PERFORMANCE CURVESAt TA= +25C, VCC= 15VDC, unless otherwise noted.

INPUT OFFSET VOLTAGE WARM-UP DRIFT

Time From Power Turn-On (min)

0

+10

+5

0

5

10

OffsetVoltageChange(V

)

1 2 3 4 5 6

G

TO-99

INPUT OFFSET VOLTAGE CHANGE

DUE TO THERMAL SHOCK

Time From Thermal Shock (min)

1

+20

+10

0

10

20

OffsetVoltageChange(V

)

0 +1 +2 +3 +4 +5

+25C +70C T = +25C to T = +70C

Fluid BathA A

INPUT VOLTAGE NOISE vs NOISE BANDWIDTH

(0.1Hz to Indicated Frequency)

Noise Bandwidth (Hz)

100 1k 10k 100k

10

1

0.1

0.01

VoltageNoise(Vrms)

R = 0S

TOTAL INPUT VOLTAGE NOISE SPECTRAL DENSITY

vs SOURCE RESISTANCE

Source Resistance ( )

100 1k 10k

1008060

1086

40

20

4

2

1

VoltageNoise(nV/Hz) -

+

R1

R1

R = 2 R1xSOURCE

Resistor Noise Only1kHz

10Hz

VOLTAGE NOISE SPECTRAL DENSITY

vs SUPPLY VOLTAGE

5

4

3

2

1

0

Supply Voltage (V )CC

5 10 15 20

Voltage

Noise(nV/Hz)

1kHz

10Hz

Voltage

Noise(nV/Hz)

VOLTAGE NOISE SPECTRAL DENSITY

vs TEMPERATURE

5

4

3

2

1

75 50 25 0 +25 +50 +75 +100 +125

Ambient Temperature (C)

10Hz

1kHz

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OPA27, 37

TYPICAL PERFORMANCE CURVES (CONT)At TA= +25C, VCC= 15VDC, unless otherwise noted.

INPUT CURRENT NOISE SPECTRAL DENSITY

CurrentNoise(pA/Hz)

1086

4

2

10.80.6

0.4

0.2

0.1

10 100 1k 10k

This industry-standard equation

is inaccurate and these figures should

be used for comparison purposes only!

Current Noise Test Circuit

In = (eno)2 (130nV)2

1M 100 x

DUT

100k

500k

500k 10keno

Frequency (Hz)

Warning:

INPUT VOLTAGE NOISE SPECTRAL DENSITY

1 10 100 1k

Frequency (Hz)

VoltageNoise(nV/Hz)

10

8

6

4

2

0

OPEN-LOOP FREQUENCY RESPONSE

Frequency (Hz)

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

140

120

100

80

60

40

20

0

VoltageGain(dB)

OPA27

OPA37

BIAS AND OFFSET CURRENT vs TEMPERATURE


75 50 25 0 +25 +50 +75 +100 +125

AbsoluteBiasCurrent(nA)

20

15

10

5

0

AbsoluteOffsetCurrent(nA)

20

15

10

5

0

Bias

Offset

OPA27 CLOSED-LOOP VOLTAGE GAIN AND

PHASE SHIFT vs FREQUENCY (G = 100)

Frequency (Hz)

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

VoltageGain(dB)

PhaseShift(degrees)

50

40

30

20

10

0

10

20

0

45

90

135

180

225

Gain

OPA37 CLOSED-LOOP VOLTAGE GAIN AND

PHASE SHIFT vs FREQUENCY (G = 100)

Frequency (Hz)

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

VoltageGain(dB)

PhaseShift(degrees)

50

40

30

20

10

0

10

20

0

45

90

135

180

225

Gain

G = 5

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OPA27, 37


COMMON-MODE REJECTION vs FREQUENCY

140

120

100

80

60

40

20

0

Common-ModeRejection(d

B)

Frequency (Hz)

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

OPA37

OPA27

OPEN-LOOP VOLTAGE GAIN vs SUPPLY VOLTAGE

130

125

120

115

VoltageGain(dB)

5


10 15 20 25

R = 2kL

R = 600L

OPEN-LOOP VOLTAGE GAIN vs TEMPERATURE

VoltageGain(dB)

135

130

125

120

115


75 50 25 0 +25 +50 +75 +100 +125

RL= 2k

SUPPLY CURRENT vs SUPPLY VOLTAGE

6

5

4

3

2

1

0

Supply

Current(mA)

0


5 10 15 20

+25C

+125C

55C

COMMON-MODE INPUT VOLTAGE RANGE

vs SUPPLY VOLTAGE+15

+10

+5

0

5

10

15

Common-

ModeRange(V)

0


5 10 15 20

T = +25CA

T = +125CA

T = 55CA

T = +25CA

T = +125CA

T = 55CA

POWER SUPPLY REJECTION vs FREQUENCY

140

120

100

80

60

40

20

0

PowerSupplyRejection(d

B)

Frequency (Hz)

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

OPA27

VCC

+VCC

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OPA27, 37


APPLICATIONS INFORMATION

OFFSET VOLTAGE ADJUSTMENT

The OPA27/37 offset voltage is laser-trimmed and will re-

quire no further trim for most applications. Offset voltage

drift will not be degraded when the input offset is nulled with

a 10ktrim potentiometer. Other potentiometer values from1kto 1Mcan be used but VOSdrift will be degraded byan additional 0.1 to 0.2V/C. Nulling large system offsetsby use of the offset trim adjust will degrade drift performance

by approximately 3.3V/C per millivolt of offset. Largesystem offsets can be nulled without drift degradation by

input summing.

The conventional offset voltage trim circuit is shown in

Figure 3. For trimming very small offsets, the higher resolu-

tion circuit shown in Figure 4 is recommended.

The OPA27/37 can replace 741-type operational amplifiers

by removing or modifying the trim circuit.

THERMOELECTRIC POTENTIALS

The OPA27/37 is laser-trimmed to microvolt-level input

offset voltage and for very low input offset voltage drift.

Careful layout and circuit design techniques are necessary to

prevent offset and drift errors from external thermoelectric

potentials. Dissimilar metal junctions can generate small

EMFs if care is not taken to eliminate either their sources

(lead-to-PC, wiring, etc.) or their temperature difference. SeeFigure 11.

Short, direct mounting of the OPA27/37 with close spacing

of the input pins is highly recommended. Poor layout can

result in circuit drifts and offsets which are an order of

magnitude greater than the operational amplifier alone.

OPA27 SMALL SIGNAL TRANSIENT RESPONSE

Time (s)

+60

+40

+20

0

20

40

60

OutputVoltage(mV)

0 1 2

A = +1

C = 15pFVCL

L

0.5 1.5 2.5

OPA37 SMALL SIGNAL TRANSIENT RESPONSE

Time (s)

+60

+40

+20

0

20

40

60

OutputVoltage(mV)

0.2 0.4 0.6

A = +5

C = 25pFV

L

0 0.8 1.0 1.2

OPA27 LARGE SIGNAL TRANSIENT RESPONSE

Time (s)

+6

+4

+2

0

2

4

6

OutputVoltage(V)

2 4 60 8 10 12

A = +1VCL

OPA37 LARGE SIGNAL TRANSIENT RESPONSE

Time (s)

+15

+10

+5

0

5

10

15

OutputVoltage(V)

1 2 30 4 5 6

A = +5V

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OPA27, 37

COMPENSATION

Although internally compensated for unity-gain stability, the

OPA27 may require a small capacitor in parallel with a

feedback resistor (RF) which is greater than 2k. Thiscapacitor will compensate the pole generated by RFand CINand eliminate peaking or oscillation.

INPUT PROTECTION

Back-to-back diodes are used for input protection on the

OPA27/37. Exceeding a few hundred millivolts differential

input signal will cause current to flow and without external

current limiting resistors the input will be destroyed.

Accidental static discharge as well as high current can

damage the amplifiers input circuit. Although the unit may

still be functional, important parameters such as input offset

voltage, drift, and noise may be permanently damaged as will

any precision operational amplifier subjected to this abuse.

Transient conditions can cause feedthrough due to the

amplifiers finite slew rate. When using the OP-27 as a unity-

gain buffer (follower) a feedback resistor of 1kis recom-

mended (see Figure 6).

NOISE: BIPOLAR VERSUS FET

Low-noise circuit design requires careful analysis of all noise

sources. External noise sources can dominate in many cases,

so consider the effect of source resistance on overall opera-

tional amplifier noise performance. At low source imped-

ances, the lower voltage noise of a bipolar operational

amplifier is superior, but at higher impedances the high

current noise of a bipolar amplifier becomes a serious liabil-

ity. Above about 15kthe Burr-Brown OPA111 low-noiseFET operational amplifier is recommended for lower total

noise than the OPA27 (see Figure 5).

FIGURE 3. Offset Voltage Trim.

FIGURE 5. Voltage Noise Spectral Density Versus Source

Resistance.

FIGURE 6. Pulsed Operation.

FIGURE 8. Unity-Gain Inverting Amplifier.

OPA27 Output

Input

1k

1k2

3

6

FIGURE 7. Low-Noise RIAA Preamplifier.

OPA37Output

97.6k

G 40dB at 1kHz.

Metal film resistors.

Film capacitors.

RLand CLper cartridge

manufacturers

recommendations.

1002

3

6

0.03F0.01F

7.87k

1F

20k

RL

Moving

Magnet

Cartridge

CL

12

3

4

6

4mV Typical Trim Range

NOTE: (1) 10kto 1M

Trim Potentiometer

(10kRecommended).

+VCC

VCC

OPA27/37

78

(1)

FIGURE 4. High Resolution Offset Voltage Trim.

1

2

3

4

6

280V Typical Trim Range

NOTE: (1) 1k Trim Potentiometer.

+VCC

VCC

OPA27/37

7

8

4.7k 4.7k

(1) OPA27 Output

1.9V/s

RF1k

Input

+

100 1k 10k 100k 1M 10M

1k

100

10

1

VoltageNo

iseSpectralDensity,

EO

Typica

lat1kHz(nV/Hz)

OPA111 + Resistor

OPA27 + Resistor

Source Resistance, RS()

EO

RS

EO= en2+ (inRS)2+ 4kTRS FO= 1kHz

Resistor Noise Only

OPA27 + Resistor

OPA111 + Resistor

Resistor Noise Only

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OPA27, 37

10k

0.5V

0.5V

0.5V

0.5V

5VA. 741 noise with circuit well-shielded from air

currents and RFI. (Note scale change.)

B. OP-07AH with circuit well-shielded from air

currents and RFI.

C. OPA27AJ with circuit well-shielded from air

currents and RFI. (Represents ultimate

OPA27 performance potential.)

D. OPA27 with circuit unshielded and exposed

to normal lab bench-top air currents.

(External thermoelectric potentials far

exceed OPA27 noise.)

E. OPA27 with heat sink and shield which

protects input leads from air currents.

Conditions same as (D).

OffsetG =1k

10Hz Low-

Pass Filter

Chart

Recorder

10mV/mm

5mm/sDUT

Total Gain = 106

10

FIGURE 11. Low Frequency Noise Comparison.

FIGURE 10. NAB Tape Head Preamplifier.

OPA37

Output

316k

4.99k

G 50dB at 1kHz.Metal film resistors.

Film capacitors.

RLand CLper head

manufacturers

recommendations.

1002

3

6

0.01F

1F

20kRL

Magnetic Tape Head

CL

FIGURE 9. High Slew Rate Unity-Gain Inverting Amplifier.

OPA37 Output

Input

1k

1k2

3

6

500pF

250

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OPA27, 37

OPA37

Output

1k

2k

EDO 6166

Transducer Frequency Response

1kHz to 50kHz

2

3

6

1M

200

500pF0.1F

FIGURE 12. Low Noise Instrumentation Amplifier.

FIGURE 13. Hydrophone Preamplifier.

FIGURE 14. Long-Wavelength Infrared Detector Amplifier.

Output

NOTE: Use metal film resistors

and plastic film capacitor. Circuit

must be well shielded to achievelow noise.

Responsivity 2.5 x 104V/WOutput Noise 30Vrms, 0.1Hz to 10Hz

Dexter 1M

Thermopile

Detector

100 100k

OPA27

2

3

6

0.1F

FIGURE 15. High Performance Synchronous Demodulator.

Output

4.99k

D2

D1

DG188TTL

In

S1S2

9.76k

500Balance

Trim

OPA27

2

3

1

8

6

20pF

10k

1k

4.75k

Offset

Trim

4.75k

+VCC

Input

TTL INPUT

1

0

GAIN

+1

1

Output

OPA37

2

3

6

OPA37

3

2

6

6

1

5

3

2

Burr-Brown INA105

Differential Amplifier

Input Stage Gain = 1 + 2RF/RG

+In

In

RG101

RF5k

RF5k

Gain = 100

Bandwidth 500kHzFor gain = 1000 use INA106 differential amplifier.

25k

25k

25k 25k

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OPA27, 37

2k

Gain = 1010V/V

Full Power Bandwidth 180kHzGain Bandwidth 500MHzEquivalent Noise Resistance 50

Signal-to-Noise Ratio Nsince amplifier noise is

uncorrelated.2k

6

2

3

20

6

2

3

6

2

3

2k

6

2

3

6

2

3 OPA37

OPA37

OPA37

OPA37

OPA37

6

Output

2

3 OPA37

N = 10 Each OPA37EZ

2k

2k

2k

2k

2k20

2k20

2k20

2k20

Input

FIGURE 16. Ultra-Low Noise N Stage Parallel Amplifier.

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OPA27, 37

OPA37 Output

Input

1k

2

3

6

500pF

250

5V

5s

RS= 50

+10V

0V

Output

10V

FIGURE 18. High Slew Rate Unity-Gain Buffer.FIGURE 17. Unity-Gain Buffer.

OPA27 Output

Input

1k

2

3

6

5V

5s

RS= 50

+10V

0V

O

utput

10V

FIGURE 20. Balanced Pyroelectric Infrared Detector.

OPA27Output

10k100

100F/20V

Tantalum

2

3

6

+

+

1

3

2

10k 10k

10F/20V

Siemens LHI 948

+15V

FIGURE 19. RF Detector and Video Amplifier.

OPA37

Video

Output

20k200

VIRTEC V1000

Planar Tunnel

Diode

2

3

60.01F

50Input

200RFC 500pF

FIGURE 21. Magnetic Tachometer.

OPA27Output

0

+

4.8V

1k

2

3Airpax

Magnetic

Pickup

fOUTRPM X N

Where N = Number of Gear Teeth

6

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IMPORTANT NOTICE

Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue

any product or service without notice, and advise customers to obtain the latest version of relevant information

to verify, before placing orders, that information being relied on is current and complete. All products are sold

subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those

pertaining to warranty, patent infringement, and limitation of liability.

TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in

accordance with TIs standard warranty. Testing and other quality control techniques are utilized to the extent

TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily

performed, except those mandated by government requirements.

Customers are responsible for their applications using TI components.

In order to minimize risks associated with the customers applications, adequate design and operating

safeguards must be provided by the customer to minimize inherent or procedural hazards.

TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent

that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other

intellectual property right of TI covering or relating to any combination, machine, or process in which such

semiconductor products or services might be or are used. TIs publication of information regarding any thirdpartys products or services does not constitute TIs approval, warranty or endorsement thereof.

Copyright 2000, Texas Instruments Incorporated

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