DAP Signal Conditioning Board User’s Guide June 2003 Data Acquistion — Digital/Analog Converters SLAU105
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.
EVM IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not considered by TI to be fit for commercial use.
EVM WARNINGS AND RESTRICTIONS When operating the bipolar signal conditioning board (OPA2132 devices), it is important to operate within the input voltage range of 15 V and the output voltage range of - 15 V and 15 V. When operating the unipolar signal conditioning board (OPA2350 devices), it is important to operate within the input voltage range of 5 V and the output voltage range of 0 V and 5 V. Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM.
Related Documentation From Texas Instruments Preface Read This First About This Manual The DAP Signal Conditioning Board is designed to provide general purpose signal conditioning to evaluation modules from the Data Acquisition ProductsGroup. This board amplifies/filters analog signals to/from a variety of A-to-D and D-to-A converters. When combined with additional sensor or amplifier boards, it can be used as part of a complete data acquisition system for a variety of applications.
Contents FCC Warning 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.
Contents Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 2 Analog Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2.1 As an Input to a Analog-to-Digital Converter EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 2.2 As an Output to a Digital-to-Analog Converter EVM . . .
Contents Figures 2-1 3-1 5-1 6-1 6-2 6-3 6-4 Application of Analog Source to ADC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Signal Conditiioning Board Installation on 5 - 6K Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . Typical Channel Configuration+Factory Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Board Assembly (Top View) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 1 Introduction The DAP Signal Conditioning Board provides data converter customers with a general purpose analog front/back end to Data Acquisition Products Evaluation Modules from Texas Instruments. The signal conditioning board is compatible with the 5 - 6K interface board (SLAU104), the C2000 interface board (SLAU106) and the HPA449 evaluation system from SoftBaugh, Inc. (www.softbaugh.com).
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Chapter 2 Analog Inputs The Signal Conditioning Board provides two primary ways to apply an analogsignal to the amplifiers. The method used to apply the signal is based on whether the board is being used as an input to an analog to digital converter, or an output from a digital to analog converter. Topic Page 2.1 As an Input to a Analog-to-Digital Converter EVM . . . . . . . . . . . . . . . . 2-2 2.2 As an Output to a Digital-to-Analog Converter EVM . . . . . . . . . . . . . .
As an Input to a Analog-to-Digital Converter EVM 2.1 As an Input to a Analog-to-Digital Converter EVM Four three-terminal screw jacks (J5, J4, J3, and J2 are located on the top side of the board to provide a convenient way to attach a variety of signal sources. The screw jacks are arranged as a channel pair for the easy application of differential or single ended analog sources. Single ended sources can be applied to terminal 1 or 3, referenced to terminal 2.
As an Output to a Digital-to-Analog Converter EVM 2.2 As an Output to a Digital-to-Analog Converter EVM The twenty pin female socket (J1) provides the analog input to the signal conditioning board when it is used in conjunction with a digital to analog converter EVM. Connector J1 plugs onto the male analog I/O header located on the interface board. Table 2 - 1 shows the analog input connector pin out. Table 2 - 1.
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Chapter 3 Analog Outputs The signal conditioning board provides two 20-pin connectors, designated J7 top and J7 bottom. J7 facilitates easy connections to various interface boards, ribbon cables or other user customized boards. The following sections provide details based on the signal conditioning needs of the application. Topic Page 3.1 As An Input to a Analog-to-Digital Converter EVM . . . . . . . . . . . . . . . 3-2 3.2 As An Input From a Digital-to-Analog Converter EVM . . . . . . . . . . . .
As an Input to a Analog-to-Digital Converter EVM 3.1 As an Input to a Analog-to-Digital Converter EVM When the signal conditioning board is used with an analog-to-digital converter EVM, connector J1 (bottom side of PCB) plugs into a male header located on the left edge of the interface board, providing support/stabilization. The output from the signal conditioning board is available on J7.
VCOM, REF( - ) and REF(+) Options 3.3 VCOM, REF( - ) and REF(+) Options Signals VCOM, REF( - ) and REF(+) provide additional flexibility to certain ADC evaluation modules. In some cases, ADCs that provide a reference voltage output may have that voltage routed to the analog I/O connector for use as a biasing voltage for the amplifiers on the signal condition board.
VCOM, REF( - ) and REF(+) Options 3-4
Analog Outputs 3-5
Chapter 4 Power Supply Requirements The following section provides details on the power option/requirements of the signal conditioning board. Topic Page 4.1 Power Connections to the Signal Conditiioning Card . . . . . . . . . . . . 4-2 4.2 Single-or Dual-Supply Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Connections to the Signal Conditioning Card 4.1 Power Connections to the Signal Conditioning Card As with the analog inputs, two power options are provided. When the signal condition board is used with an interface card, power is typically applied though J9, a 6-pin female socket located beside J7 on the bottom of the board. For stand alone applications, power can be applied to the three position screw jack, J6 (see the schematics for details). 4.
Chapter 5 Amplifier Configuration Options This section provides details on the signal conditioning board input configuration options. The information is based on applying signals to the three-terminal screw jacks, J2–J5. Refer to the schematic at the end of this document and/or Table 1 - 1 when analog inputs are applied to the J1 connector. Topic Page 5.1 Single Ended Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2 5.2 Differential Inputs . . . . . . .
Single Ended Inputs 5.1 Single Ended Inputs Single ended analog input signals can be applied to screw jack terminals one or three, referenced to terminal two. While jumpers W1–W9 are in their default positions (pins 1 - 2), 2.5 V is applied to the noninverting terminals of U1 through U4. A 5 Vp-p signal, from 0-5 V, applied to terminals 1 or 3 will provide an inverted 0 - 5 V signal to the corresponding output pin on J7. Table 5 - 1 shows the mapping of J1 through J5 to J7. Table 5 - 1.
Differential Inputs Figure 5 - 1. Typical Channel Configuration+Factory Defaults Note: Components marked with asterisk are NOT installed.
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Chapter 6 DAP Signal Conditioning Board Assembly and Board Schematics This chapter contains the board assembly and board schematics. Topic Page 6.1 DAP Signal Conditioning Board Assembly . . . . . . . . . . . . . . . . . . . . . . 6-2 6.2 DAP Signal Conditioning Board Schematics . . . . . . . . . . . . . . . . . . . .
DAP Signal Conditioning Board Assembly 6.1 DAP Signal Conditioning Board Assembly Figure 6 - 1. Board Assembly (Top View) Figure 6 - 2.
DAP Signal Conditioning Board Assembly Figure 6 - 3.
DAP Signal Conditioning Board Schematic 6.2 DAP Signal Conditioning Board Schematic Figure 6 - 4.
Revision History REV ECN Number Approved Note: C5 W7 C3 IN3 330pF W3 R8 R16 4.99K 4.99K 330pF R4 R12 4.99K 4.99K -Vin D -Vin J7 4 D 1 3 * U2A OUT2 J3 R11 1 +Vin R7 3 +Vin R3 W4 R28 4.99K 4.99K IN8 C R32 7 5 R26 4.99K 4.99K * 6 IN4 C24 * R23 R30 2 10uF REFp + C13 10uF OUT5 C R19 VCOM Vref 4.99K W9 Vref + C4 IN5 W5 W1 R6 R14 4.99K 4.99K C16 10uF C2 IN1 330pF U5 REG1117A 330pF R2 R10 4.99K 4.
