ADS8342EVM User’s Guide November 2003 Data Acquisition SLAU120
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 It is important to operate this EVM within the input voltage range of 1.8 VDC to 5 VDC and the output voltage range of 0 - 5 VDC. Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions concerning the input range, please contact a TI field representative prior to connecting the input power.
Related Documentation From Texas Instruments Preface Read This First About This Manual This users guide describes the characteristics, operation, and use of the ADS8342 Modular EVM. A complete circuit description as well as schematic diagram is included.
Trademarks 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 EVM Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 1.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 2 Analog Interface . . . . . . . . . . . .
Contents vi
Chapter 1 EVM Overview This chapter contains the features and introduction. Topic Page 1.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 1.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Features 1.1 Features - Four true bipolar inputs - High speed parallel interface - Direct operation with a variety of DSK platforms from Texas Instruments 1.2 Introduction The ADS8342 modular EVM is a platform for evaluation of all operating modes of the ADS8342. It provides a buffered parallel data output and an on-board analog front end (AFE) circuit as an example of a typical input configuration. Jumpers located on the EVM provide static control over the CLKDIV and BYTE pins.
Chapter 2 Analog Interface The ADS8342 modular EVM easily interfaces to multiple analog sources. 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 J1. Connector J1 and jumpers W1 through W4 provide access to the ADS8342 analog input pins. Analog signals applied to J1 are fed directly to the data converter when shunts are placed on pins 1 - 2 of W1–W4.
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Chapter 3 Digital Interface The following section describes the ADS8342 EVM digital interface. Topics include the jumper configuration for byte and conversion- clock division ratio, the parallel data interface and the parallel control signals A0, A1, RD, CS, and CONVST. Topic Page 2.1 Conversion Clock and BYTE Control . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 2.2 Parallel Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 2.
Conversion Clock and BYTE Control 3.1 Conversion Clock and BYTE Control Jumpers W5–W7 control the clock divide and parallel data format of the ADS8342.
Chapter 4 Power Supply Options The ADS8342 modular EVM board requires ±5 VDC for the ADS8342 circuit. Positive 3.3 VDC is required for the digital circuitry found on the EVM. Power to the EVM is applied to the 10-pin dual-row header/socket combination of J2. When used in combination with one of the DAP Interface boards, the socket portion of J2 (bottom side of the PWB) provides connection to the common power bus described in document SLAU104.
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Chapter 5 EVM Operation The analog input source for channels AIN0–AIN3 is applied directly to connector J1, pins 2, 4, 6, or 8 (top or bottom side) or through the onboard AFE via the SMA connector labeled INPUT. When using the AFE circuit, resistors R9, R10, R11 and R12 as well as capacitors C21 and C27 provide customizable filtering of the input signal. J1 or AFE inputs are selected through jumpers W1–W4. For J1 use, shunts must be installed at pins 1 - 2.
The following table shows the default jumper locations of the ADS8364 EVM: Jumper W1 W2 W3 W4 W5 Default Position 1-2 Closed W6 Closed W7 Closed W8 2-3 W9 1-2 W10 1-2 W11 5-6 W12 2-3 5-2 Function 1 - 2: AINx samples analog signal applied at J1 2 - 3: AINx samples signal from analog front end (U2) Closed: BYTE pin of ADS8342 pulled low Open: BYTE pin of ADS8342 pulled high Closed: CLKDIV0 pin of ADS8342 pulled low (See Section 3.
Chapter 6 ADS8342 Modular EVM BOM and Schematic This chapter contains the ADS8342 modular EVM bill of materials and the schematic. Topic Page 6.1 Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2 6.2 Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bill of Materials 6.1 Bill of Materials The following table contains a complete bill of materials for the ADS8342 modular EVM board. The schematic diagram is also provided for reference. Designators Description Manufacturer Mfg. Part Number C1- C4 C7 C9 C13 C14 C16- C18 C20 C22 C23 0.1 µF, 1206, ceramic, X7R, 50 V, 10% AVX Corp. 12065C104KAT2A C5 C6 C8 C10 C15 C19 4.7 µF, A case, tantalum, 16 V, 10% Panasonic T491A475K016AS C11 220 µF, 10 V tantalum, 10% AVX Corp.
Schematic 6.2 Schematic The ADS8342 modular EVM schematic is on the following page.
