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Universal Operational Amplifier Evaluation Module With Shutdown
User's Guide
1998
Mixed-Signal Products
SLVU009
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 acknowledgement, 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 TI's 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. CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE ("CRITICAL APPLICATIONS"). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER'S RISK. In order to minimize risks associated with the customer's 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. TI's publication of information regarding any third party's products or services does not constitute TI's approval, warranty or endorsement thereof.
Copyright (c) 1998, Texas Instruments Incorporated
How to Use This Manual
Preface
Read This First
About This Manual
This User's Guide describes the universal operational amplifier (op amp) evaluation module (EVM) with shutdown that can be used to construct many op amp evaluation circuits. Schematics of the EVM and several example circuits are included.
How to Use This Manual
This document contains the following chapters:
FCC Warning
Chapter 1 Introduction Chapter 2 Schematics Chapter 3 Board Layout Chapter 4 Example Circuits
This equipment is intended for use in a laboratory test environment only. It generates, uses, and can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to subpart J of part 15 of FCC rules, which are designed to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments may cause interference with radio communications, in which case the user at his own expense will be required to take whatever measures may be required to correct this interference.
Trademarks
TI is a trademark of Texas Instruments Incorporated.
Read This First
iii
iv
Running Title--Attribute Reference
Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.1 Design Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 1.2 Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2.1 Area Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 Board Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.1 Physical Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.1.1 Area 100 - SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.1.2 Area 200 - MSOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.1.3 Area 300 - SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.1.4 Area 400 - SOT23-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2 Component Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3 Board Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 3-2 3-2 3-2 3-2 3-2 3-3 3-4
2
3
4
Example Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 4.1 Schematic Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2 4.2 Sallen-Key Low-Pass Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3 4.3 Sallen-Key High-Pass Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4 4.4 Inverting Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6 4.5 Noninverting Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7 4.6 Two Operational Amplifier Instrumentation Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8 4.7 Differential Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
Chapter Title--Attribute Reference
v
Running Title--Attribute Reference
Figures
2-1 2-2 2-3 2-4 3-1 3-2 3-3 4-1 4-2 4-3 4-4 4-5 4-6 Area 100 Schematic - SOIC (14 pin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 Area 200 Schematic - MSOP (10 pin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 Area 300 Schematic - SOIC (8 pin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 Area 400 Schematic - SOT23-6 (6 pin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 Component Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3 Board Layout Top . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4 Board Layout Bottom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5 Sallen-Key Low-Pass Filter with Dual Supply Using Area 100 . . . . . . . . . . . . . . . . . . . . . . . 4-3 Sallen-Key High-Pass Filter with Single Supply Using Area 200 . . . . . . . . . . . . . . . . . . . . . 4-5 Inverting Amplifier with Dual Supply Using Area 300 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6 Noninverting Amplifier with Single Supply Using Area 400 . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7 Two Operational Amplifier Instrumentation Amplifier with Single Supply Using Area 200 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9 Single Operational Amplifier Differential Amplifier with Single Supply Using Area 300 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
vi
Chapter 1
Introduction
This User's Guide describes a universal operational amplifier (op amp) evaluation module (EVM) with shutdown (#SLOP224). The EVM simplifies evaluation of Texas Instruments surface-mount op amps with the shutdown feature.
Topic
1.1 1.2
Page
Design Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Introduction
1-1
Design Features
1.1 Design Features
The board design allows many circuits to be constructed easily and quickly. The board has four circuit development areas that can be snapped apart. Areas 100 and 200 are for dual op amps in the SOIC and MSOP packages. Area 300 is for single op amps in SOIC packages. Area 400 is for single op amps in SOT23-6 packages. A few possible circuits are as follows:
-
Voltage follower Noninverting amplifier Inverting amplifier Simple or algebraic summing amplifier Difference amplifier Current to voltage converter Voltage to current converter Integrator/low-pass filter Differentiator/high-pass filter Instrumentation amplifier Sallen-Key filter
Two-layer board construction with a ground plane on the solder side ensures that circuit performance will be on par with final production designs.
1.2 Power Requirements
The devices and designs that are used dictate the input power requirements. Three input terminals are provided for each area of the board: Vx+ GNDx Vx- Positive input power for area x00 i.e., V1+ area 100 Ground reference for area x00 i.e., GND2 area 200 Negative input power for area x00 i.e., V4- area 400
Each area has four bypass capacitors - two for the positive supply, and two for the negative supply. Each supply should have a 1-F to 10-F capacitor for low frequency bypassing and a 0.01-F to 0.1-F capacitor for high frequency bypassing. When using single-supply circuits, the negative supply is shorted to ground by bridging C112 or C113 in area 100, C212 or C213 in area 200, C305 or C306 in area 300, or C405 or C406 in area 400. Power input is between Vx+ and GNDx. The voltage reference circuitry is provided for single-supply applications that require a reference voltage to be generated.
1-2
Introduction
Chapter 2
Schematics
This chapter contains schematics and pin-outs for each of the four areas.
Topic
2.1
Page
Area Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Schematics
2-1
Area Schematics
2.1 Area Schematics
Figures 2-1 through 2-4 show schematics for each of the board areas. The schematics show all components that the board layout can accommodate. These should only be used as reference, since not all components will be used at any one time.
Figure 2-1. Area 100 Schematic - SOIC (14 pin)
R119 V1+ R121 V1+ C104 GND1 C112 V1- Power Supply Bypass V1- C113 A104+ C105 A102- A103+ R108 A101- R110 R109 R120 C115 C106
R106 V1+ 14 2 - 3+ 6 4 A1/SD 1 A1OUT 1/2 Dual Op Amp R107
U101a
V1- C114 R118
A1 FLT C108
C107
V1+ R113 R115 VREF1 R103 B101- R116 R R117 B104+ C U102 A C111 B102- B103+ R111 R102 R101 R112 12 C109
C102
R104
-
9 13 U101b
B1/SD B1OUT 1/2 Dual Op Amp
11 +
R105 Voltage Reference R114 C110
B1 FLT C103
C101 U101 pins 5, 7, 8, and 10 = NC
2-2
Schematics
Area Schematics
Figure 2-2. Area 200 Schematic - MSOP (10 pin)
R219 V2+ R221 V2+ C204 GND2 C212 V1- Power Supply Bypass V2- C213 A204+ C205 A202- A203+ R208 A201- R210 R209 R220 2 C215 C206
R206 V2+ 10 - 4 V2- R207 A2 FLT C208 5 1 U201a A2/SD A2OUT 1/2 Dual Op Amp
3+
C214
R218
C207
V2+ R213 R215 VREF2 B201- R216 R R217 B204+ C U202 A C211 B202- B203+ R211 R203 C209
C202
R204
6 R202 R201 R212 8 7 - + 9 U201b
B2/SD B2OUT 1/2 Dual Op Amp
R205 Voltage Reference R214 C210
B2 FLT C203
C201
Schematics
2-3
Area Schematics
Figure 2-3. Area 300 Schematic - SOIC (8 pin)
R301 V3+ V3+ C304 C303 301- R304 GND3 V3- 304+ Power Supply Bypass V3+ R312 VREF3 R311 R R310 V3- C309 302- C305 C306 303+ R309 R308 R307 2 R303 C302 R302 V3+ 78 - 4 V3- R305 3 FLT R306 C307 6 U301 3/SD 3OUT C301
3+
C308
C U302 A
C310
U301 pins 1 and 5 = NC
Voltage Reference
Figure 2-4. Area 400 Schematic - SOT23-6 (6 pin)
V4+ V4+ R403 C404 GND4 C405 V4- Power Supply Bypass V4- C406 402- 403+ R409 404+ C403 401- R404 R408 R407 4 R401 C401
C402
R402 V4+ 6 - 2 V4- R406 5 1 U401 R405 4 FLT C407 4/SD 4OUT
3+
V4+ R412 VREF4 R411 R R410
C409
C408
C U402 A
C410
Voltage Reference
2-4
Schematics
Chapter 3
Board Layout
This chapter shows the universal op amp EVM with shutdown board layout, and describes the relationships between the four areas.
Topic
3.1 3.2 3.3
Page
Physical Consideration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 Component Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3 Board Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Board Layout
3-1
Physical Considerations
3.1 Physical Considerations
The EVM board has four circuit development areas. Each area can be separated from the others by breaking along the score lines. The circuit layout in each area supports an op amp package, voltage reference, and ancillary devices. The op amp package is unique to each area as described in the following paragraphs. The voltage reference and supporting devices are the same for all areas. Surface-mount or through-hole components can be used for all capacitors and resistors on the board. The voltage reference can be either surface-mount or through-hole. If surface mount is desired, the TLV431ACDBV5 or TLV431AIDBV5 adjustable shunt regulators can be used. If through hole is desired, the TLV431ACLP, TLV431AILP, TL431CLP, TL431ACLP, TL431ILP or TL431AILP adjustable shunt regulators can be used. Refer to Texas Instruments' Power Supply Circuits Data Book (literature number SLVD002) for details on usage of these shunt regulators. Each passive component (resistor or capacitor) has a surface mount 1206 footprint with through holes at 0.2 spacing on the outside of the 1206 pads. Therefore, either surface-mount or through-hole parts can be used.
3.1.1
Area 100 - SOIC
Area 100 uses 1xx reference designators, and is compatible with dual op amps with shutdown packaged as a 14-pin SOIC. This surface-mount package is designated by a D suffix in TI part numbers, as in TLV2463CD, TLV2363ID, TLV2263AID, etc. Refer to Figure 2-1 for a schematic.
3.1.2
Area 200 - MSOP
Area 200 uses 2xx reference designators, and is compatible with dual op amps with shutdown packaged as a 10-pin MSOP. The MSOP package is designated by a DGS suffix in TI part numbers, as in TLV2463CDGS. Refer to Figure 2-2 for a schematic.
3.1.3
Area 300 - SOIC
Area 300 uses 3xx reference designators, and is compatible with single op amps with shutdown packaged in the 8-pin SOIC package. This surfacemount package is designated by a D suffix in TI part numbers, as in TLV2461CD. Refer to Figure 2-3 for a schematic.
3.1.4
Area 400 - SOT23-6
Area 400 uses 4xx reference designators, and is compatible with single op amps with shutdown packaged in the 6-pin SOT-23 package. This surface-mount package is designated by a DBV suffix in TI part numbers, as in TLV2460CDBV. Refer to Figure 2-4 for a schematic.
3-2
Board Layout
Component Placement
3.2 Component Placement
Figure 3-1 shows component placement for the EVM board.
Figure 3-1. Component Placement
Area 100 Texas Instruments, 1998 B104+ B103+ B102- B101- B1_OUT B1_FLT V1+ B1/SD VREF1 GND1 A1SD V1- A1_OUT A1_FLT A104+ A103+ A102- A101- J101 1 R101 C101 R102 R103 R104 C102 R105 C103 C104 C105 U101 R111 C109 R112 R113 C110 R114 U102 C111 R115 R116 C112 C113 C114 R117 R118 R119 R120 C115 R121 Area 300 Texas Instruments, 1998 REV 2 REV 2 V1+ GND1 GND3 V3+ R301 C301 R302 C302 R303 R304 C303 C304 UNIVERSAL OPAMP EVM W/SHUTDOWN SLOP224-3 U301 11
R310 R311 U302 R312 C310 VREF3 301- 302- V3+ GND3 V3- 3FLT 3OUT 303+ 304+ 3/SD
UNIVERSAL OPAMP EVM W/SHUTDOWN
SLOP224-1
18
Score Line
C106 R106 C107 R107 C108 R108 R109 R110
V1+ GND1 GND3 V3+
C305 C306 R305 C307 C308 C309 R306 R307 R308 R309
SOIC
SOIC
1 J301
Texas Instruments, 1998 B204+ B203+ B202- B201- B2_OUT B2_FLT V2+ B2/SD VREF2 GND2 A2/SD V1- A2_OUT A2_FLT A204+ A203+ A202- A201- J201 1 R201 C201 R202 R203 R204 C202 R205 C203 C204 C205 U201 R211 C209 R212 R213 C210 R214 U202 C211 R215 R216 C212 C213 C214 R217 R218 R219 R220 C215 R221 Area 200
UNIVERSAL OPAMP EVM W/SHUTDOWN
UNIVERSAL OPAMP EVM W/SHUTDOWN
SLOP224-2
SLOP224-4
Texas Instruments, 1998 REV 2 REV 2 V2+ GND2 GND4 V4+ R401 C401 R402 C402 R403 R404 C403 C404 U401 11
C410 R410 R411 U402 R412 VREF4 401- 402- V4+ GND4 V4- 4FLT 4OUT 403+ 404+ 4/SD
18
C206 R206 C207 R207 C208 R208 R209 R210
V2+ GND2 GND4 V4+
C405 C406 R405 C407 C408 C409 R406 R407 R408 R409 Area 400
SOT23-6
MSOP
1 J401
Score Line
Board Layout
3-3
Board Layout
3.3 Board Layout
Figures 3-2 and 3-3 show the EVM top and bottom board layouts, respectively.
Figure 3-2. Board Layout Top
3-4
Board Layout
Board Layout
Figure 3-3. Board Layout Bottom
Board Layout
3-5
3-6
Board Layout
Chapter 4
Example Circuits
This chapter shows and discusses several example circuits that can be constructed using the universal operational amplifier EVM. The circuits are all classic designs that can be found in most operational amplifier design books.
Topic
4.1 4.2 4.3 4.4 4.5 4.6 4.7
Page
Schematic Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2 Sallen-Key Low-Pass Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3 Sallen-Key High-Pass Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5 Inverting Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7 Noninverting Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8 Two Operational Amplifier Instrumentation Amplifiers . . . . . . . . . . . 4-9 Differential AMplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
Example Circuits
4-1
Schematic Conventions
4.1 Schematic Conventions
Figures 4-1 through 4-6 show schematic examples of circuits that can be constructed using the universal operational amplifier EVM with shutdown. The components that are placed on the board are shown in bold. Unused components are blanked out. Jumpers and other changes are noted. These examples are only a few of the many circuits that can be built.
4-2
Example Circuits
Sallen-Key Low-Pass Filter
4.2 Sallen-Key Low-Pass Filter
Figure 4-1 shows area 100 equipped with a dual operational amplifier configured as a second-order Sallen-Key low-pass filter using dual-power supplies. Basic setup is done by proper choice of resistors R and mR, and capacitors C and nC. The transfer function is:
V
OUT V IN
+
1 1 - f fo 2
)jQ
f fo
Where:
fo
And
+ 2p
1 m n RC
Q
+ mm n )1
R119 C106 R106
Figure 4-1. Sallen-Key Low-Pass Filter with Dual Supply Using Area 100
V1+ A101- V1+ C104 0.1 F GND1 C112 0.1 F C113 10 F C105 10 F
R121
C115 Jumper
Vout Vin = 1 1- (f/fo)2 + (j/Q)(f/fo)
R110 A102- A103+ A104+ R108 + Vin - C114 R109 mR R120 R
2
V1+ 6 A1/SD 14 1 A1OUT 3+ U101a 4 1/2 Dual Op Amp - V1- fo = Q= R107 C107 nC A1 FLT C108 1 2 mn RC mn m+1
V1-
Power Supply Bypass
V1-
R118
V1+ R113 R115 VREF1 R103 B101- R114 R R117 B104+ Jumper Not Used R114 C U102 A C111 R102 B102- B103+ R101 R111 R112 C109 R104 Jumper 12 9 - 13 U101b B1/SD B1OUT 1/2 Dual Op Amp C102
11 +
Voltage Reference Not Used
C110
R105 B1 FLT C103
C101
Example Circuits
4-3
Sallen-Key High-Pass Filter
4.3 Sallen-Key High-Pass Filter
Figure 4-2 shows area 200 equipped with a dual operational amplifier configured as a second-order Sallen-Key high-pass filter using single-supply power input. Basic setup is done by proper choice of resistors R and mR, and capacitors C and nC. Note that capacitors should be used for components R211 and R212, and a resistor for C201. The transfer function for the circuit as shown is:
V OUT
Where:
+ VIN + 2p
1
)jQ
- f fo
2 2
f fo - f fo
) VREF2
fo
And
1 m n RC
Q
+ nm n )1
The TL431 adjustable precision shunt regulator, configured as shown, provides a low impedance reference for the circuit at about 1/2 V2+ in a 5 V system. Another option is to adjust resistors R216 and R217 for the desired VREF2 voltage. The formula for calculating VREF2 is:
VREF2
+ 2.50 V R216 ) R217 R217
4-4
Example Circuits
Sallen-Key High-Pass Filter
Figure 4-2. Sallen-Key High-Pass Filter with Single Supply Using Area 200
R219 V2+ R221 V2+ C204 0.1 F Jumper GND2 C212 C205 10 F C213 A204+ Jumper A201- R210 A202- A203+ R208 R209 R220 C215 Jumper V2+ 5 10 2 - 1 3+ U201a 4 V2- C206 R206
A2/SD A2OUT 1/2 Dual Op Amp Not Used
V1-
Power Supply Bypass
V2- C214
R218 R207 A2 FLT C207 C208
R213 VREF2 = 2.5 V V2+ R215
2.2 k
C202 R204
R203 B201- R202 B202- B204+ R201 mR R211 C + Vin -
C209 Jumper 8 7 R212 fo = nC C210 R214 R205 Q= 6 - + 9 U201b
VOUT = VIN
-(f/fo)2 1+(j/Q)(f/fo) - (f/fo)2 + VREF2
B2/SD B2OUT 1/2 Dual Op Amp 1 2 mn RC mn m+1 B2 FLT
Jumper
R216 R R217
C A U202 TL431ACLP
C211 10 F B203+
Jumper B204 + to VREF2 Voltage Reference
C201 R
C203
Example Circuits
4-5
Inverting Amplifier
4.4 Inverting Amplifier
Figure 4-3 shows area 300 equipped with a single operational amplifier configured as an inverting amplifier using dual power supplies. Basic setup is done by choice of input and feedback resistors. The transfer function for the circuit as shown is:
V OUT
+ -VIN R302 R304
To cancel the effects of input bias current, set R306 = R302 || R304, or use a 0- jumper for R306 if the operational amplifier is a low input bias operational amplifier.
Figure 4-3. Inverting Amplifier with Dual Supply Using Area 300
R301 V3+ R303 V3+ C304 0.1 F GND3 C305 0.1 F C306 10 F C303 10 F 301- V3+ R304 302- 303+ R309 + 304+ Vin Power Supply Bypass V3- - C309 R306 R305 3 FLT V3+ R312 VREF3 C308 C307 Jumper R308 R307 2 - 7 4 V3- 8 6 U301 R306 = R302 II R304, or Short if Using Low Input Bias Op Amp C302 C301
R302 R302 VOUT = -VIN R304 3/SD 3OUT
3+
V3-
R311 R R310
C U302 A
C310
Voltage Reference Not Used
4-6
Example Circuits
Noninverting Amplifier
4.5 Noninverting Amplifier
Figure 4-4 shows area 400 equipped with a single operational amplifier configured as a noninverting amplifier with single-supply power input. Basic setup is done by choice of input and feedback resistors. The transfer function for the circuit as shown is:
V
OUT
+ VIN 1 ) R402 ) VREF4 R404
The input signal must be referenced to VREF4. To cancel the effects of input bias current, set R409 = R402 || R404, or use a 0- jumper for R409 if the operational amplifier is a low input bias operational amplifier. The TL431 adjustable precision shunt regulator, configured as shown, provides a low impedance reference for the circuit at about 1/2 V4+ in a 3 V system. Another option is to adjust resistors R410 and R411 for the desired VREF4 voltage. The formula for calculating VREF4 is:
VREF4
+ 1.24 V R411 ) R410 R410
R401 C401 R402 V4+ R404 R408 R409 404+ V4- R407 4 - 3+ 65 1 2 U401 VOUT = VIN +1 4/SD 4OUT
Figure 4-4. Noninverting Amplifier with Single Supply Using Area 400
V4+ V4+ C404 0.1 F Jumper GND4 C403 10 F C406 R403 401- Jumper 402 - to VREF4 C405 402- 403+ Power Supply Bypass V4- C402
(
R405 R407
) + VREF4
V4-
V4+ R414 2.2 k VREF4 = 1.24 V Jumper
+ Vin -
C409
R406 R405 4 FLT C408 C407
R411 C R R410 U402 = TLV431ACDBV5 A
C410 10 F Input Signal With Reference to VREF4 R409 = R402 II R404, or Short if Using Low Input Bias Op Amp
Voltage Reference
Example Circuits
4-7
Two Operational Amplifier Instrumentation Amplifier
4.6 Two Operational Amplifier Instrumentation Amplifier
Figure 4-5 shows area 200 equipped with a dual operational amplifier configured as a two-operational-amplifier instrumentation amplifier using a voltage reference and single power supply. Basic setup is done by choice of input and feedback resistors. The transfer function for the circuit as shown is:
V
Where
OUT
+ VIN 1 ) 2R206 ) R206 ) VREF2 R210 R221
R206 = R202 and R221 = R204
To cancel the effects of input bias current, set R208 = R206 || R210 and set R211 = R202 ||R204, or use a 0- jumper for R208 and R211 if the operational amplifier is a low input bias operational amplifier. The TLV431 adjustable precision shunt regulator, configured as shown, provides a low impedance reference for the circuit at about 1/2 V2+ in a 3 V system. Another option is to adjust resistors R216 and R217 for the desired VREF2 voltage. The formula for calculating VREF2 is:
VREF2
+ 1.24 V R216 ) R217 R217
4-8
Example Circuits
Two Operational Amplifier Instrumentation Amplifier
Figure 4-5. Two Operational Amplifier Instrumentation Amplifier with Single Supply Using Area 200
R219 C206 Jumper A201 - to B2OUT R206 R208 = R206 II R210 or Short if Using Low Input Bias Op Amp V2+ A203+ V2+ C204 0.1 F Jumper GND2 C205 10 F Jumper A202- to B201- C214 R218 R208 A204+ R221 A201- Jumper R210 A202- R209 R220 2 V2+ C215 VOUT = Vin
(1+ 2R206 R210
R206 + R221
)+ VREF2
10 5 - 1 3+ U201a 4 V2-
A2/SD A2OUT 1/2 Dual Op Amp R206 = R202 R221 = R204 R207 A2 FLT
C212
C213
V1-
+ Power Supply Bypass V2- - R213 V2+ Jumper VREF2 to B202- R203 B201- Jumper R202 R216 C R R217 U202 A TLV431ACDBV5 B204+ B202- C211 10 F B203+ R201 R212 Jumper 8 7 C209 Vin
C207
C208
C202 R204
R215 2.2 k VREF2 = 1.24 V Jumper
6 - + 9 U201b
B2/SD B2OUT 1/2 Dual Op Amp
R211
Voltage Reference
R211 = R202 II R204 or Short if Using Low Input Bias Op Amp
R214 C210
R205 B2 FLT
C201
C203
Example Circuits
4-9
Differential Amplifier
4.7 Differential Amplifier
Figure 4-6 shows area 300 equipped with a single operational amplifier configured as a differential amplifier using a voltage reference and single power supply. Basic setup is done by choice of input and feedback resistors. The transfer function for the circuit as shown is:
V
Where
OUT
+ VIN
R302 R304
) VREF3
R302 R304
+ R309 R308
The TLV431 adjustable precision shunt regulator, configured as shown, provides a low impedance reference for the circuit at about 1/2 V3+ in a 3 V system. Another option is to adjust resistors R311 and R310 for the desired VREF3 voltage. The formula for calculating VREF3 is:
VREF3
+ 1.24 V R311 ) R310 R310
Figure 4-6. Single Operational Amplifier Differential Amplifier with Single Supply Using Area 300
R301 V3+ R303 V3+ C304 0.1 F
Jumper
C301 R302
C302 V3+ R302 Vout = Vin R304
301- C303 10 F + 302- Vin 303+ - 304+ R304 R308 R309 R319 Jumper 2 78 6 4 U301
(
) + VREF3
GND3
- 3+
3/SD 3OUT
C305
C306
V3- Power Supply Bypass V3+ R312
2.2 k
V3- R302 R309 = R304 R308 C309 R306 R305 3 FLT C308 Jumper 304+ to VREF3 C307
V3-
VREF3 = 1.24 V R311 R R310
C A U302 TLV431ACDBV5
C310 10 F
Voltage Reference
4-10
Example Circuits

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