Copyright © Cirrus Logic, Inc. 2007
(All Rights Reserved)
www.cirrus.com
CDB30xx
Operational Amplifier
Prototype Board
Features
Prototyping Platform for CS30xx Operational Amplifiers
Support for Differential & Single-ended Inputs/Outputs
Includes Op-amp Samples (two each of the following)
– CS3001
– CS3002
– CS3011
– CS3012 See Table 1 on page 3.
– CS3003
– CS3004
– CS3013
– CS3014
General Description
The CDB30xx is a blank circuit board that provides a prototyp-
ing 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 con-
nected between the four sections unless the board is
separated into its smaller sections.
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 Evaluation Board
JUN ‘07
DS798DB2
CDB30xx
2DS798DB2
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
CDB30xx
DS798DB2 3
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 (al though 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.
For detailed information on the CS30xx ADCs, go to www.cirrus.com.
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 14MHz
6nV/√Hz
@0.5Hz 125nV p-p
@10Hz 2.7 to 6.7 N Y
3002 24MHz
6nV/√Hz
@0.5Hz 125nV p-p
@10Hz 2.7 to 6.7 N Y
3003 12MHz
17nV/√Hz
@1Hz 350nV p-p
@10Hz 2.7 to 5.5 Y Y
3004 22MHz
17nV/√Hz
@0.5Hz 350nV p-p
@10Hz 2.7 to 5.5 Y Y
3011 12MHz
12nV/√Hz
@0.5Hz 250nV p-p
@10Hz 2.7 to 6.7 N Y
3012 22MHz
12nV/√Hz
@0.5Hz 250nV p-p
@10Hz 2.7 to 6.7 N Y
3013 11MHz
22nV/√Hz
@0.5Hz 460nV p-p
@10Hz 2.7 to 5.5 Y Y
3014 21MHz
22nV/√Hz
@0.5Hz 460nV p-p
@10Hz 2.7 to 5.5 Y Y
CDB30xx
4DS798DB2
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 config-
uration because it provides low noise and can be configured for gains as high as 2000X. Gain is set by
the equation,
where Rx is R15, R16, or R17, selected by a jumper connection.
Figure 1. Section 1 Schematic, Differentia l Input / Differential Output
R13 R19
Rx
CDB30xx
DS798DB2 5
3. CIRCUIT 2 - DIFFERENTIAL INPUT / SINGLE-ENDED OUTP UT
Circuit 2 is a differential amplifier that uses two op-amps. The board accepts a dual amplifier for this func-
tion. This circuit accepts a differential input signal, amplifies it, and converts the signal to a ground-refer-
enced, single-ended output signal. Gain is set by the equation,
Figure 2. Section 2 Schematic, Dual Op-amp Instrumentation Amplifier
V
OUT
VIN(+)VIN
(-)
–
()
()
1R25
R21
-----------2R25
R23
-------------------++=
R20 = R21
R22 = R25
CDB30xx
6DS798DB2
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. Alth ough the two schematics are ident ical in func-
tion, the circuits do have unique component designators.
Figure 3. Section 3 Schematic, Inverting or Non-inverting Amplifier
CDB30xx
DS798DB2 13
REVISION HISTORY
Revision Date Changes
DB1 JUN 2007 Initial Release.
DB2 JUN 2007 Added photo of board to front p age. 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 not ice and is provided " AS IS" wit hout warr anty of any kind (exp ress or impl ied). Cus tomers are ad vised to o btain the latest version of relevant
information to ve rify, before placing ord er s , 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. No responsib ility is a ssumed by C irrus
for the use of this info rm ation, inc lud ing us e of th is in form atio n as the basis for ma nufactur e or sale of any items , or for in fringement of patents or other rights of third
parties. This document is the property of Cirrus and by furnishing this information, Cirrus grants no license, express or implied under any patents, mask work rights,
copyrights, trademarks, trade secrets or other intellectual property rights. Cirrus owns the copyrights associated with the information contained herein and gives con-
sent for copies to be made of the information only for use within your organization with respect to Cirrus integrated circuits or other prod uct s of Ci r ru s. This c ons ent
does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale.
CERTAIN APPL ICATIONS USI NG SEMICONDUCTOR PRODUCTS MA Y INVOLVE PO TENTIA L RISKS OF DE ATH, PERSONAL INJURY, OR SEVERE PROP-
ERTY OR ENVIRONMENTAL DAM AGE ("CRITICAL APPLICATIONS"). CIRRUS PRODUCTS ARE NOT DE SIGNED, AUTHORIZED OR W ARRANTED FOR USE
IN AIRCRAFT SYSTEMS, MIL ITARY APPLICA TIONS, PRODUCTS SURGICALLY IMPLANTED INTO THE BODY, AUTOMOTIVE SAFETY OR SECURITY DE-
VICES, 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, STATUT ORY OR IMPLIED, INCLUDING THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR PARTICULAR PU RPOSE, WITH REGARD TO ANY CIRRUS PRODUCT THAT IS USED IN
SUCH A MANNER. IF THE CUSTOM ER OR CUSTOM ER'S CUSTOMER USES OR PERMITS THE USE OF CIRRUS PRODUCTS IN CRITICAL APPLICATIONS,
CUSTOMER AGREES, BY SUCH US E, T O FULL Y I NDEMNIF Y CIRRUS , I TS OFF ICERS, DIRECT ORS, EMPLOYEE S, DISTRI BUTORS 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 doc ument may be t r ademar k s
or service marks of their respective owners.
