CDB30xx Operational Amplifier Prototype Board Features General Description Prototyping Platform for CS30xx Operational Amplifiers The CDB30xx is a blank circuit board that provides a prototyping platform for the CS30xx series of operational amplifiers. The board has four different circuit sections. The board can be used intact or it can be separated into four separate smaller boards. The power supply connection and grounds are all connected between the four sections unless the board is separated into its smaller sections. Support for Differential & Single-ended Inputs/Outputs Includes Op-amp Samples (two each of the following) - CS3001 - CS3002 - CS3011 - CS3012 - CS3003 - CS3004 - CS3013 - CS3014 www.cirrus.com See Table 1 on page 3. The board is provided without components but a selection of Cirrus Logic operational amplifiers are provided as samples. The samples include two each of the CS3001, CS3002, CS3011, CS3012, CS3003, CS3004, CS3013, and CS3014 devices. Refer to Table 1 on page 3 for a summary of features for the op-amps included with the CDB30xx. ORDERING INFORMATION CDB30xx Copyright (c) Cirrus Logic, Inc. 2007 (All Rights Reserved) Evaluation Board JUN `07 DS798DB2 CDB30xx TABLE OF CONTENTS 1. INTRODUCTION ....................................................................................................................... 3 2. CIRCUIT 1 - DIFFERENTIAL INPUT / DIFFERENTIAL OUTPUT ........................................... 4 3. CIRCUIT 2 - DIFFERENTIAL INPUT / SINGLE-ENDED OUTPUT .......................................... 5 4. CIRCUIT 3 & 4 - INVERTING / NON-INVERTING GAIN .......................................................... 6 Appendix A. PCB Layer Plots .................................................................................................... 8 REVISION HISTORY .................................................................................................................. 13 LIST OF FIGURES Figure 1. Section 1 Schematic, Differential Input / Differential Output ............................................ 4 Figure 2. Section 2 Schematic, Dual Op-amp Instrumentation Amplifier ........................................ 5 Figure 3. Section 3 Schematic, Inverting or Non-inverting Amplifier ............................................... 6 Figure 4. Section 4 Schematic, Inverting or Non-inverting Amplifier ............................................... 7 Figure 5. Silkscreen......................................................................................................................... 8 Figure 6. Component Side Routing ................................................................................................. 9 Figure 7. Ground Plane ................................................................................................................. 10 Figure 8. Power Plane................................................................................................................... 11 Figure 9. Bottom Side Routing ...................................................................................................... 12 2 DS798DB2 CDB30xx 1. INTRODUCTION There are four different sections of the board. - Section 1 is a differential input, differential output amplifier configuration using a dual-amplifier pin out. - Section 2 is a two op-amp, differential amplifier using a dual-amplifier pin out. - Sections 3 and 4 are identical amplifier circuits (although they have different component designators for their components). These can be configured for either inverting gain or non-inverting gain configurations. Sections 3 and 4 use the single-amplifier pin out. The following table provides a brief summary of features for the op-amps included with the CDB30xx board. Table 1. Typical Specifications for Cirrus Logic Chopper-stabilized Amplifiers Device Channels GBW Voltage Noise 0.1 to 10 Hz Noise Supply Range R-to-R Input R-to-R Output 3001 1 4 MHz 6nV/Hz @ 0.5 Hz 125nV p-p @ 10 Hz 2.7 to 6.7 N Y 3002 2 4 MHz 6nV/Hz @ 0.5 Hz 125nV p-p @ 10 Hz 2.7 to 6.7 N Y 3003 1 2 MHz 17nV/Hz @ 1 Hz 350nV p-p @ 10 Hz 2.7 to 5.5 Y Y 3004 2 2 MHz 17nV/Hz @ 0.5 Hz 350nV p-p @ 10 Hz 2.7 to 5.5 Y Y 3011 1 2 MHz 12nV/Hz @ 0.5 Hz 250nV p-p @ 10 Hz 2.7 to 6.7 N Y 3012 2 2 MHz 12nV/Hz @ 0.5 Hz 250nV p-p @ 10 Hz 2.7 to 6.7 N Y 3013 1 1 MHz 22nV/Hz @ 0.5 Hz 460nV p-p @ 10 Hz 2.7 to 5.5 Y Y 3014 2 1 MHz 22nV/Hz @ 0.5 Hz 460nV p-p @ 10 Hz 2.7 to 5.5 Y Y For detailed information on the CS30xx ADCs, go to www.cirrus.com. DS798DB2 3 CDB30xx 2. CIRCUIT 1 - DIFFERENTIAL INPUT / DIFFERENTIAL OUTPUT Circuit 1 is a differential input / differential output amplifier. This circuit is commonly used to amplify the differential signal from a bridge transducer, such as a load cell. The amplified differential output signal is then input into an A/D converter that has a fully differential input. For narrowband signals below 2 kHz, the CS3002 dual amplifier is a good choice for this amplifier configuration because it provides low noise and can be configured for gains as high as 2000X. Gain is set by the equation, R13 R19 Rx where Rx is R15, R16, or R17, selected by a jumper connection. Figure 1. Section 1 Schematic, Differential Input / Differential Output 4 DS798DB2 CDB30xx 3. CIRCUIT 2 - DIFFERENTIAL INPUT / SINGLE-ENDED OUTPUT Circuit 2 is a differential amplifier that uses two op-amps. The board accepts a dual amplifier for this function. This circuit accepts a differential input signal, amplifies it, and converts the signal to a ground-referenced, single-ended output signal. Gain is set by the equation, ( )( R25 2 R25 V OUT = ( VIN +) - (VIN -) 1 + ----------- + ------------------R23 R21 ) R20 = R21 R22 = R25 Figure 2. Section 2 Schematic, Dual Op-amp Instrumentation Amplifier DS798DB2 5 CDB30xx 4. CIRCUIT 3 & 4 - INVERTING / NON-INVERTING GAIN Circuit 3 and Circuit 4 are identical, single-amplifier circuits that, according to component placement, can be configured for either inverting or non-inverting gain. Although the two schematics are identical in function, the circuits do have unique component designators. Figure 3. Section 3 Schematic, Inverting or Non-inverting Amplifier 6 DS798DB2 CDB30xx Figure 4. Section 4 Schematic, Inverting or Non-inverting Amplifier DS798DB2 7 CDB30xx Figure 5. Silkscreen APPENDIX A. PCB LAYER PLOTS 8 DS798DB2 Figure 6. Component Side Routing CDB30xx DS798DB2 9 Figure 7. Ground Plane CDB30xx 10 DS798DB2 Figure 8. Power Plane CDB30xx DS798DB2 11 Figure 9. Bottom Side Routing CDB30xx 12 DS798DB2 CDB30xx REVISION HISTORY Revision Date Changes DB1 JUN 2007 Initial Release. DB2 JUN 2007 Added photo of board to front page. Changed text to reflect board is shipped with op-amp samples. Contacting Cirrus Logic Support For all product questions and inquiries contact a Cirrus Logic Sales Representative. To find the one nearest to you go to www.cirrus.com IMPORTANT NOTICE "Advance" product information describes products that are in development and subject to development changes. Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised 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, indemnification, and limitation of liability. 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CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE ("CRITICAL APPLICATIONS"). CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED FOR USE IN AIRCRAFT SYSTEMS, MILITARY APPLICATIONS, PRODUCTS SURGICALLY IMPLANTED INTO THE BODY, AUTOMOTIVE SAFETY OR SECURITY DEVICES, LIFE SUPPORT PRODUCTS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF CIRRUS PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER'S RISK AND CIRRUS DISCLAIMS AND MAKES NO WARRANTY, EXPRESS, STATUTORY OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE, WITH REGARD TO ANY CIRRUS PRODUCT THAT IS USED IN SUCH A MANNER. IF THE CUSTOMER OR CUSTOMER'S CUSTOMER USES OR PERMITS THE USE OF CIRRUS PRODUCTS IN CRITICAL APPLICATIONS, CUSTOMER AGREES, BY SUCH USE, TO FULLY INDEMNIFY CIRRUS, ITS OFFICERS, DIRECTORS, EMPLOYEES, DISTRIBUTORS AND OTHER AGENTS FROM ANY AND ALL LIABILITY, INCLUDING ATTORNEYS' FEES AND COSTS, THAT MAY RESULT FROM OR ARISE IN CONNECTION WITH THESE USES. Cirrus Logic, Cirrus, and the Cirrus Logic logo designs are trademarks of Cirrus Logic, Inc. All other brand and product names in this document may be trademarks or service marks of their respective owners. DS798DB2 13 CDB30xx NOTES 14 DS798DB2