ST AN2995 handbook
Contents
1. Kyy AN2995 Demonstration board user guidelines for single operational amplifiers Introduction This demonstration board is designed to help in the characterization of single operational amplifiers in SOT23 5 two different pinouts and SC70 5 packages Operational amplifiers in SOT23 6 and SC70 6 packages can also be characterized but their respective standby pin cannot be used since it is connected to Vcc on the board This document provides m a brief description of the demonstration board m a layout of the top and bottom layers m some examples of typical configurations that can be tested with the board June 2009 Doc ID 15840 Rev 1 1 13 www st com Board description AN2995 1 Board description This board is designed with versatility in mind In particular its components allow it to be configured as a low pass Sallen Key circuit a high pass Sallen Key circuit a differential amplifier an AC coupled circuit an in loop compensation circuit an out of loop compensation circuit and numerous other possible configurations not described here The board is designed for surface mounted components in SOT23 5 and SOT23 6 or SC70 5 SC70 6 packages It can be used to perform on board characterization prior to the integration of STMicroelectronics products in your designs Resistor and capacitor footprints are implemented in the 0805 series A set of two decoupling capacitors have been implemented2. on both power supply pins so as to benefit from the maximum performances of ST products In order to reject a wide range of frequencies 100 nF and 4 7 uF are good values for these capacitors Figure 1 Demonstration board schematics AM04501 2 13 Doc ID 15840 Rev 1 ky AN2995 Board layout 2 Board layout The board has the following physical characteristics Board dimensions 2080 x 1900 mils 52 8 x 48 3 mm 2 layer PCB For Vout Vin1 and Vin2 male SMB or 2 mm female connectors can be implemented You can also implement test points on these three voltages to facilitate visualization of your signals Figure 2 shows the top and bottom layers of the board Figure 2 Top and bottom layers e eo o 2 2 oi _ Pm re SOOT OOO ie e s Doc ID 15840 Rev 1 3 13 Possible configurations AN2995 3 Possible configurations This chapter provides instructions on how to set up the board with several typical configurations Figure 3 low pass Sallen Key configuration Figure 4 high pass Sallen Key configuration Figure 5 differential amplifier configuration Figure 6 in loop compensation configuration Figure 7 out of loop compensation configuration Figure 8 AC coupled configuration You can also connect several boards together if you need to evaluate more complicated schematics using several operational amplifiers 3 1 Low pass Sallen Key configuration The low p
3. TH RESPECT TO THE USE AND OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION OR INFRINGEMENT OF ANY PATENT COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE ST PRODUCTS ARE NOT RECOMMENDED AUTHORIZED OR WARRANTED FOR USE IN MILITARY AIR CRAFT SPACE LIFE SAVING OR LIFE SUSTAINING APPLICATIONS NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY DEATH OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE ST PRODUCTS WHICH ARE NOT SPECIFIED AS AUTOMOTIVE GRADE MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER S OWN RISK Resale of ST products with provisions different from the statements and or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever any liability of ST ST and the ST logo are trademarks or registered trademarks of ST in various countries Information in this document supersedes and replaces all information previously supplied The ST logo is a registered trademark of STMicroelectronics All other names are the property of their respective owners 2009 STMicroelectronics All rights reserved STMicroelectronics group of companies Australia Belgium Bra
4. ass Sallen Key configuration is a second order filter configuration Z4 and Z9 are used to set the gain Fc 1 2 Pl sqrt Z1 Z2 C5 C6 Z7 Z8 Z12 and Z14 must be not connected Z3 and Z13 must be shorted Figure 3 Low pass Sallen Key configuration AM04502 3 2 High pass Sallen Key configuration Like the low pass Sallen Key configuration this is also a second order filter configuration Z4 and Z9 are used to set the gain Fe 1 2 Pl sqrt C1 C2 Z5 Z6 Z7 Z8 Z12 and Z14 must be not connected Z3 and Z13 must be shorted 4 13 Doc ID 15840 Rev 1 ky AN2995 Possible configurations 3 3 3 4 Figure 4 High pass Sallen Key configuration Vini AM04503 Differential amplifier configuration The differential amplifier configuration allows the subtraction of two voltages The transfer function is Vout Vin1 Z8 Z4 Z8 Z5 Z1 Z5 Z4 Z8 Vin2 Choosing Z8 Z1 and Z4 Z5 gives Vout Vin1 Vin2 Z4 Z8 Z6 Z7 Z9 Z12 and Z14 must be not connected Z2 Z3 and Z13 must be shorted Figure 5 Differential amplifier configuration Z4 Vout AM04504 In loop compensation configuration The goal of this compensation technique is to stabilize an amplifier configuration with a capacitive load This compensation is called in loop because the additional components Z13 and Z4 used to improve the stability are inserted in the feedback loop Z5 Z6 and Z8 must be
5. ion history AN2995 Revision history 12 13 Table 3 Document revision history Date Revision Changes 23 Jun 2009 1 Initial release Doc ID 15840 Rev 1 AN2995 Please Read Carefully Information in this document is provided solely in connection with ST products STMicroelectronics NV and its subsidiaries ST reserve the right to make changes corrections modifications or improvements to this document and the products and services described herein at any time without notice All ST products are sold pursuant to ST s terms and conditions of sale Purchasers are solely responsible for the choice selection and use of the ST products and services described herein and ST assumes no liability whatsoever relating to the choice selection or use of the ST products and services described herein No license express or implied by estoppel or otherwise to any intellectual property rights is granted under this document If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein UNLESS OTHERWISE SET FORTH IN ST S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WI
6. not connected Z1 Z2 and Z3 must be shorted a More information on compensation methods can be found in application note AN2653 Operational amplifier stability compensation methods for capacitive loading applied to TS507 see Table 2 Document references ky Doc ID 15840 Rev 1 5 13 Possible configurations AN2995 Figure 6 Compensation in loop configuration Z14 Z12 F AM04505 3 5 Out of loop compensation configuration A simple compensation method using only one extra component consists in adding a resistor Z13 in series between the output of the amplifier and its load It is often referred to as the out of loop compensation method because the additional component is added outside of the feedback loop Z3 Z5 Z6 Z8 Z9 and Z14 must be not connected Z1 Z2 and Z4 must be shorted Figure 7 Compensation out of loop configuration Z13 Vout Vin1 AM04506 3 6 AC coupled circuit configuration This typical configuration allows you to amplify the AC part only of the input signal Z2 Z6 Z7 Z9 Z12 and Z14 must be not connected No component is shorted b More information on compensation methods can be found in application note AN2653 Operational amplifier stability compensation methods for capacitive loading applied to TS507 see Table 2 Document references 6 13 Doc ID 15840 Rev 1 ky AN2995 Possible configurations Figure 8 AC coupled circ
7. sion RR I O op amp LMV321 SOT23_b Low cost low power RR I O op amp TSV321 SOT23_b General purpose RR I O op amp TS1851 SOT23_b 1 8 V RR I O low power op amp TS1871 SOT23_b 1 8 V RR I O low power op amp TS321 SOT23_b Low power high voltage op amp TS461 SOT23_b Output RR low noise op amp TS931 SOT23_b Output RR micropower op amp TS941 SOT23_b Output RR micropower op amp TS951 SOT23_b RR I O low power op amp TS971 SOT23_b Output RR very low noise op amp The SOT23 5 comes with two possible pin configurations as shown in Figure 10 on page 10 c Note that operational amplifiers in SOT23 6 or SC70 6 packages single with standby can be evaluated but the standby pin is by default connected to Vcc and cannot be changed ky Doc ID 15840 Rev 1 9 13 Board schematics and associated products AN2995 10 13 Figure 10 Package pinouts SOT23 5 SOT23 5 SC70 5 SOT23_b SOT23_t SOT23 6 SC70 6 AM04527 Doc ID 15840 Rev 1 ky AN2995 Ordering information Ordering information To order the board online go to http www st com stonline products families evaluation_boards steval cca022v1 htm References Table 2 Document references Document AN2653 Operational amplifier stability compensation methods for capacitive loading applied to TS507 http www st com stonline products literature anp 14 130 pdf ky Doc ID 15840 Rev 1 11 13 Revis
8. uit configuration Vin2 Z8 Z3 Ss 35 Z4 Vout AM04507 Doc ID 15840 Rev 1 7 13 Board schematics and associated products AN2995 Appendix A Board schematics and associated products A 1 Board schematic Figure 9 Demonstration board for single operational amplifier in SOT23 and SC70 packages Z14 Vin 2 mm Vin _SMB Vin 2mm Vin _SMB e 8 13 Vecp 2 mm m C1 C2 VOut i o VGOut 2 mm Vout Vout_SMB AM04526 Doc ID 15840 Rev 1 AN2995 Board schematics and associated products A 2 Associated products in SOT23 or SC70 packages Table 1 List of operational amplifiers in SOT23 or SC70 packages Product SOT23 5 1 6 SC70 5 6 Description TSV611 SOT23_t SC70 5 11 pA 120 kHz RR I O CMOS op amp TSV6191 SOT23 t SC70 5 11 pA 450 kHz RR I O CMOS op amp TSV620 SOT23_6 SC70 6 29 pA 420 kHz RR I O op amp with SHDN TSV621 SOT23_t SC70 5 29 pA 420 kHz RR I O CMOS op amp TSV6290 SOT23_6 SC70 6 29 pA 1 3 MHz RR I O op amp with SHDN TSV6291 SOT23_t SC70 5 29 pA 1 3 MHz RR I O CMOS op amp TSV630 SOT23_6 SC70 6 60 pA 880 kHz RR I O op amp with SHDN TSV631 SOT23_b SC70 5 60 pA 880 kHz RR I O CMOS op amp TSV6390 SOT23_6 SC70 6 60 UA 2 5 MHz RR I O op amp with SHDN TSV6391 SOT23_b SC70 5 60 pA 2 5 MHz RR I O CMOS op amp TSV911 SOT23_b RR I O 8 MHz op amp TSV991 SOT23_b RR I O 20 MHz op amp TS507 SOT23_b High preci
9. zil Canada China Czech Republic Finland France Germany Hong Kong India Israel Italy Japan Malaysia Malta Morocco Philippines Singapore Spain Sweden Switzerland United Kingdom United States of America www st com ki Doc ID 15840 Rev 1 13 13
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ST AN2995 handbook