Texas Instruments 551012875, 551012922 Universal Op Amp Evaluation Boards (SOT-23 and SC-70) (Rev. C) User's Guide

User's Guide

SNOA487C – May 2007 – Revised May 2013

AN-1606 551012875, 551012922 Universal Op Amp

Evaluation Boards (SOT-23 and SC-70)

1 Overview

The 551012875 and 551012922 Universal Evaluation Boards are designed to aid in the evaluation and testing of Texas Instruments low voltage/low power and some precision operational amplifiers. These boards will accommodate op amps that are assembled in a 6-Pin or 5-Pin SOT-23 and SC-70 package, regardless of the pin orientation.

This board is designed to use one or two amplifiers. Many different circuits can be made such as inverting, non-inverting, and differential-IN-differential-OUT amplifiers and low-pass, high-pass, band-pass, bandreject, or notch second-order filters. The amplifiers can be powered with single or dual supplies. These circuits can be configured without any modifications to the board; all that is necessary is to select the correct resistors and capacitors. The other optional components can be left open or shorted depending on the configuration desired.

These universal evaluation boards are designed as two-layer boards; the top side of each is designed for op amps with a pinout as shown in

Figure 1

.

The bottom side of each board is designed for op amps with the pinout shown in

Figure 2 . The board has

been manufactured with vias connecting the equivalent pins of the top and bottom amplifiers. For example, Pin 1 of IC

1A is connected to Pin 3 of IC

2A

. Similarly all other equivalent pins of the top and bottom amplifiers are connected. This allows for an efficient use of one board to test two amplifiers of different package types while keeping the same components on the board; just make sure that only one amplifier is soldered to the same pads.

Circuit performance of this evaluation board will be comparable to final production designs. Use this evaluation board as a guide for general layout and a tool to aid in device testing and characterization.

SOT-23/SC-70

+IN

1 6

V

+

V

2

+

-

5

SD

-IN

3 4

OUT

Figure 1. Connection Diagram for IC

1A and IC

1B

SOT-23/SC-70

OUT

1 6

V

+

V

-

2 5

SD

+ -

+IN

3 4

-IN

Figure 2. Connection Diagram for IC

2A and IC

2B

WEBENCH is a trademark of Texas Instruments.

All other trademarks are the property of their respective owners.

SNOA487C – May 2007 – Revised May 2013

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AN-1606 551012875, 551012922 Universal Op Amp Evaluation Boards

(SOT-23 and SC-70)

Copyright © 2007–2013, Texas Instruments Incorporated

1

Hardware Setup

2 Hardware Setup

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2.1

Component Notation

The pins of the footprint for IC

1A is true for IC

1B and IC

2B are connected to the equivalent pins for the footprint of IC

Therefore, this application report will refer to the amplifier in IC

1A

2A and the same or IC

2A as Amp A and the amplifier in IC

1B or IC

2B amplifier; for example, R

4A as Amp B. The subscript of the PCB component refers to the specific is used for Amp A and R

4B for Amp B. In this document, components will be referred to, as an example, C

3

. If using Amp A this refers to component C

3A

, if using Amp B this refers to component C

3B

.

In some circuits, a resistor will be installed where the PCB is labeled for a capacitor or a capacitor will be installed where a resistor is labeled. For example, C position. R

C5

R6 indicates that a capacitor should be in the R

6 means that a resistor will be installed in the C

5 position.

2.2

Power

Power is applied to the points labeled V − , GND, and V + . If a single supply is used, then V − should be connected to GND. A virtual ground, halfway between the positive supply voltage and ground, is the reference point for the input and output voltages. The output voltage swings above and below this virtual ground. Single-supply operation requires the generation of this virtual ground, usually at a voltage equal to

V + /2. The circuit in

Figure 3

can be used to generate V junction along with capacitor C

1

+ /2; R

1 and R

2 should be of equal values. This will form a low-pass filter used to eliminate conducted noise or transients on the positive supply rail.

V

IN

V

+

V

+

+

AMP

-

V

OUT

R

1

C

1

R

2

Figure 3. Single Supply Virtual Ground

2.3

Op Amp

Solder an op amp to either the IC

1A additional op amp to either IC

1B or IC or IC

2B

2A position. If building a circuit requiring two op amps, solder an

. The corresponding pinout is shown on each side of the PCB.

2.4

Bypassing

Install the following capacitors:

C

6A

, C

9A

, C

6B

, C

9B

: 0.1 µF

C

7A

, C

8A

, C

7B

, C

8B

: 1 µF

2.5

Shutdown

To use the shutdown feature of the amplifier in either the SOT-23 or the SC-70 package, install a resistor at R

15 and an optional capacitor at C

11

. The shutdown voltage is applied at S/D-A or S/D-B depending on the package of the amplifier being used.

2 AN-1606 551012875, 551012922 Universal Op Amp Evaluation Boards





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Circuit Configurations

2.6

Input and Output

SMA connectors are used for the input and output of signals. They are located on the edges of the PCB.

3 Circuit Configurations

3.1

Non-Inverting Amplifier

V

IN

R

8

+

R

7

V

OUT

R

12

R

14

C

3

, R

4

, R

5

= 0 (SHORT)

C

3

R

4

R

5

R

8

R

7

R

14

R

12

Short

Short

Short

Input Termination

Output series resistance (used for matching transmission lines or isolation)

Gain Resistor

Gain Resistor

Figure 4. Non-Inverting Amplifier

Where:

V

OUT

= 1 +

V

IN

R

14

R

12

(1)






3


3.2

Inverting Amplifier

R

6

+

-

R

7

V

OUT

V

IN

R

8

R

11

R

14

C

3

, R

9

, R

13

= 0 (SHORT)

C

3

R

9

R

13

R

8

R

7

R

14

R

11

Short

Short

Short

Input Termination


Gain Resistor

Gain Resistor

Figure 5. Inverting Amplifier

Where:

V

OUT

= -

V

IN

R

14

R

11 www.ti.com

(2)

3.3

Register Calculations

Input Impedance: Set R

T to the desired input impedance. Calculate R

8 where:

R

8

=

R

11 x

R

T

R

11

- R

T

To cancel the input bias current set R

6 to the value calculated with the following formula:

R

6

=

R

11 x

R

14

R

11

- R

14

(3)

(4)

3.4

Active Filter Applications

Both Sallen-Key and Multiple Feedback filters can be built on this PCB. To design a filter, use the

WEBENCH™ tool at www.ti.com.

Performance at high frequencies is limited to the gain bandwidth product of the amplifier, but within this frequency range, these active filters can achieve very good accuracy, if lowtolerance resistors and capacitor are used.






www.ti.com

3.5

Sallen-Key Low-Pass Filter

C

3

R

13

R

7

R

8

Short

Short


Input Termination

Set the following as determined using WEBENCH: R

4

, R

5

, C

R6

, R

14

, R

12

C

5

V

IN

R

8

R

4

R

5

C

R6

+

-

R

7

V

OUT

R

12

R

14

C

3

, R

13

= 0 (SHORT)

Figure 6. Sallen-Key Low-Pass Filter


3.6

Multiple Feedback Low-Pass Filter

Note: If needed, an input termination resistor will need to be soldered on to the SMA connector between the signal pin and the ground pin.

R

6

R

13

R

9

Short

Short

Short

C

5

R

7

Short



C3

, C

R8

, R

4

, R

11

, C

10

R

4

C

10

V

IN

R

IN

R

C3

R

11

C

R8

-

+

R

7

V

OUT

R

6

, R

13

, R

9

, C

5

= 0 (SHORT)

Figure 7. Multiple Feedback Low-Pass Filter






5


3.7

Sallen-Key High-Pass Filter

C

3

R

13

R

14

R

7

R

8

Short

Short

Short


Input Termination

Set as determined using WEBENCH: C

R4

, C

R5

, R

C5

, R

6

R

C5

V

IN

R

8

C

R4

C

R5

R

6

+

-

R

7

V

OUT

C

3

, R

13,

R

14

= 0 (SHORT)

R

14

= 0

Figure 8. Sallen-Key High-Pass Filter www.ti.com

3.8

Multiple Feedback High-Pass Filter


R

9

R

4

R

7

Short

Short


Set the following as determined using WEBENCH: C

3

, R

8

, C

5

, C

R11

, R

14

C

5

R

14

V

IN

R

IN

C

3

C

R11

R

8

-

+

R

7

V

OUT

R

9

, R

4

= 0 (SHORT)

Figure 9. Multiple Feedback High-Pass Filter






www.ti.com

3.9

Sallen-Key Band-Pass Filter

C

3

R

13

R

7

R

8

Short

Short


Input Termination

Set as determined using WEBENCH: R

4

, C

4

, C

R5

, R

6

, R

C5

, R

14

, R

12

R

C5

V

IN

R

8

R

4

C

4

C

R5

R

6

+

-

R

7

V

OUT

R

12

R

14

C

3

, R

13

= 0 (SHORT)

Figure 10. Sallen-Key Band-Pass Filter


3.10 Multiple Feedback Band-Pass Filter


R

6

R

13

R

9

R

4

R

7

Short

Short

Short

Short



C3

, R

8

, C

5

, C

R11

, R

14

C

5

R

14

V

IN

R

IN

R

C3

C

R

8

R11

-

+

R

7

V

OUT

R

6

, R

13

, R

9

, R

4

= 0 (SHORT)

Figure 11. Multiple Feedback Band-Pass Filter






7

Applications Using Two Amplifiers

4 Applications Using Two Amplifiers

4.1

Two-Amplifier Filters

Filters using two amplifiers can be built by connecting the output of Amp A to the input of Amp B.

www.ti.com

4.2

Single-Ended to Differential Conversion

The circuit in

Figure 12

will convert a single-ended signal to a differential signal. This is done by using the combination of an inverting amplifier and a non-inverting amplifier. Each amplifier generates output signals of equal magnitude but of opposite polarity. This topology is useful in applications where the signal source is single-ended, but the ADC requires a differential input. The board will need to be modified by connecting Input A to Input B with a jumper wire.

R

5A

+V

IN

R

8A

R

1

V

+

R

6A

R

12A

+

AMP

-

R

7A

+V

OUT

+

R

14A

R

6B

V

DIFF

C

1 R

2

-

R

C4

+

AMP

-

-V

OUT

-V

IN

R

11B

R

7B

R

14B

C

3A

, R

4A,

R

5B,

R

9B,

C

3B

= 0 (SHORT)

Figure 12. Single-Ended to Differential Conversion






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Applications Using Two Amplifiers

4.3

Differential Input, Differential Output, Non-Inverting

Combining two non-inverting amplifiers with a common feedback network, as shown in

Figure 13 , forms a

non-inverting amplifier with a differential input and a differential output. Through the inherent cancellation of the two op amp common-mode error signals this configuration fully exploits the noise reduction benefits of CMRR. In addition the output voltage swing is doubled and depending on the op amp used, the bandwidth and slew rate may also be increased, while maintaining the original gain bandwidth specification.

+V

IN

R

8A

C

R4A

V

+

V

+

+

AMP A

-

R

7A

+V

OUT

R

6A

R

1

C

1

R

2

R

14A

R

3

R

14B

R

6B

V

+

R

7B

-V

IN

C

R4B

-

AMP B

+

-V

OUT

R

8B

C

3A

, R

5A,

R

5B,

C

3B

= 0 (SHORT) A = 1+

R

14A

+ R

14B

R

3

Figure 13. Differential Input, Differential Output, Non-Inverting






9

551012875-001 Schematic

5 551012875-001 Schematic

www.ti.com

Figure 14. 551012875-001 Schematic






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6 551012875-001 Layouts

551012875-001 Layouts

Figure 15. 551012875-001 Top Layout

Figure 16. 551012875-001 Bottom Layout






11

551012922-001 Schematic

7 551012922-001 Schematic

www.ti.com

Figure 17. 551012922-001 Schematic






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8 551012922-001 Layouts

551012922-001 Layouts

Figure 18. 551012922-001 Top Layout

Figure 19. 551012922-001 Bottom Layout






13

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TI warrants performance of its components to the specifications applicable at the time of sale, in accordance with the warranty in TI’s terms and conditions of sale of semiconductor products. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where mandated by applicable law, testing of all parameters of each component is not necessarily performed.

TI assumes no liability for applications assistance or the design of Buyers’ products. Buyers are responsible for their products and applications using TI components. To minimize the risks associated with Buyers’ products and applications, Buyers should provide adequate design and operating safeguards.

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Texas Instruments 551012875, 551012922 Universal Op Amp Evaluation Boards (SOT-23 and SC-70) (Rev. C) User's Guide

User's Guide

1 Overview

2 Hardware Setup

2.1

Component Notation

2.2

Power

2.3

Op Amp

2.4

Bypassing

2.5

Shutdown

2.6

Input and Output

3 Circuit Configurations

3.1

Non-Inverting Amplifier

3.2

Inverting Amplifier

3.3

Register Calculations

3.4

Active Filter Applications

3.5

Sallen-Key Low-Pass Filter

3.6

Multiple Feedback Low-Pass Filter

3.7

Sallen-Key High-Pass Filter

3.8

Multiple Feedback High-Pass Filter

3.9

Sallen-Key Band-Pass Filter

3.10 Multiple Feedback Band-Pass Filter

4 Applications Using Two Amplifiers

4.1

Two-Amplifier Filters

4.2

Single-Ended to Differential Conversion

4.3

Differential Input, Differential Output, Non-Inverting

5 551012875-001 Schematic

6 551012875-001 Layouts

7 551012922-001 Schematic

8 551012922-001 Layouts

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