User's Guide SBAU176A – August 2010 – Revised May 2011 ADS833xEVM User's Guide ADS833xEVM This user's guide describes the characteristics, operation, and use of the ADS833xEVM. This evaluation model (EVM) is an evaluation board for the ADS8331 and the ADS8332, a high-performance, 16-bit, fouror eight-channel, successive approximation register (SAR) analog-to-digital converter (ADC). The EVM allows evaluation of all aspects of the ADS8331 and ADS8332.
EVM Overview 1 2 3 4 5 6 7 8 www.ti.com Contents EVM Overview ............................................................................................................... Analog Interface ............................................................................................................. Digital Interface .............................................................................................................. Power Supplies ................................................................
Analog Interface www.ti.com 1.2 Introduction The ADS833xEVM, shown in Figure 1, is an evaluation module built to the TI Modular EVM System specification. It can be connected to any modular EVM system interface card. Note that the ADS833xEVM has no microprocessor and cannot run software. To connect it to a computer, some type of interface is required. Figure 1. ADS833xEVM 2 Analog Interface For maximum flexibility, the ADS833xEVM is designed for easy interfacing to multiple analog sources.
Digital Interface www.ti.com 3 Digital Interface 3.1 Serial Data Interface The ADS833xEVM is designed to easily interface with multiple control platforms. Samtec part numbers SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a convenient 10-pin, dual-row, header/socket combination at J5. This header/socket provides access to the digital control and serial data pins of the ADC. Consult Samtec at http://www.samtec.com or call 1-800-SAMTEC-9 for a variety of mating connector options.
Power Supplies www.ti.com 4 Power Supplies J3 is the power-supply input connector. Table 3 lists the configuration details for J3. Analog inputs to the ADC can be applied directly to the device (see Analog Input). An additional bipolar supply is needed to power the bipolar amplifiers. For optimum noise performance, the external supplies (+VA and –VA) should be used. Table 3. J3 Configuration: Power-Supply Input Pin No. Pin Name Function Required J3.1 +VA +10V to +15V Yes J3.
EVM Operation 7 www.ti.com EVM Operation This section provides information on the analog input, digital control, and general operating conditions of the ADS833xEVM. 7.1 Analog Input The four inputs from the ADS8331 (or eight inputs from the ADS8332) are routed directly from the ADC to header J1 on the EVM board. On the printed circuit board (PCB), there is the option to install a first-order RC filter on any of the channels.
EVM Operation www.ti.com The ADS833xEVM has several hardware options to allow users to test the ADC under certain conditions. On the PCB, jumpers are used to add or remove op amps to drive the reference line and the ADC input. By default, the EVM is configured to use the REF5040 to create a 4.096V signal for the reference voltage; it is buffered through an OPA350. The analog inputs also have the option to use an onboard op amp to properly drive the ADC input.
Schematics and Layout 8 www.ti.com Schematics and Layout The schematic for the ADS833xEVM is appended to this user's guide. The bill of materials is provided in Table 5. Figure 3 and Figure 4 illustrate the PCB layout. 8.1 Bill of Materials Table 5. Bill of Materials Item No. ADS8331 Qty ADS8332 Qty Description Manufacturer 1 0 0 C1, C2, C3, C4, C5, C6, C7, C8 Not installed 2 5 5 C11, C18, C22, C25, C27 Capacitor, ceramic 10UF 6.
Schematics and Layout www.ti.com Table 5. Bill of Materials (continued) ADS8331 Qty ADS8332 Qty 1 0 U3 IC ADC 16-bit 500kSPS 4-Ch 24VQFN Texas Instruments ADS8331IBRGET 0 1 U3 IC ADC 16-bit 500kSPS 8-Ch 24VQFN Texas Instruments ADS8332IBRGET 29 1 1 U4 IC EEPROM 256Kbit 400kHz 8SOIC Microchip 24AA256-I/SN 30 1 1 U5 IC Precision V-ref 4.096V LN 8-SOIC Texas Instruments REF5040AID 31 1 1 U7 IC Op Amp GP R-R 38MHZ SGL 8SOIC Texas Instruments OPA350UA 32 7 7 N/A 0.
Schematics and Layout www.ti.com Figure 3. ADS833xEVM: Top Layer Figure 4.
Revision History www.ti.com Revision History Changes from Original (August, 2010) to A Revision .................................................................................................... Page • Updated Table 3 .......................................................................................................................... 5 NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
1 2 3 4 5 6 Revision History -VA REV ECN Number Approved 4 C30 0.1uF U2 3 6 2 7 OPA211AID D D +VA C13 0.1uF R8 CH7_FLT R26 C8 DNI C26 750pF J1A 17 18 15 16 13 14 11 C 12 9 10 7 8 5 6 3 4 1 2 R7 0 CH6_FLT +IN6/NC C7 2 DNI CH7 +IN7/NC 3 R6 CH5 0 Ch5_FLT CH4 C6 23 22 CH3 R5 0 CH2 Ch4_FLT 21 C5 20 DNI CH1 SCLK +IN4/NC 24 DNI TP1 +IN5/NC 1 CH6 J2A ADCIN 20 MUXOUT 4 19 JP3 34.
Evaluation Board/Kit Important Notice Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards.
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