Texas Instruments ADS8861EVM-PDK User Manual

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This user's guide describes the operation and use of the

ADS8861 is an 16-bit, true-differential, unipolar, successive approximation register (SAR), analog-to-digital

converter (ADC) with a maximum throughput of 1 MSPS. This ADC is very low power with excellent noise

and distortion performance for ac or dc signals. The performance demonstration kit (PDK) eases EVM

evaluation with additional hardware and software for computer connectivity through universal serial bus

(USB). The

ADS8861EVM-PDK

A-to-B USB cable, and 6-V wall-adapter power supply. This user's guide covers the circuit description,

schematic diagram, and bill of materials for the ADS8861EVM daughter card.

The related documents shown in

ADCPro is a trademark of Texas Instruments.

Windows is a registered trademark of Microsoft Corporation.

C is a trademark of NXP Semiconductors.

Samtec is a trademark of Samtec, Inc.

All other trademarks are the property of their respective owners.

SBAU214 – October 2013

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ADS8861EVM-PDK

includes the ADS8861EVM as a daughter card, MMB0 motherboard,

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Summary of Contents for Texas Instruments ADS8861EVM-PDK

Page 1 THS4521 SBOS458 TPS78833 SLVS382 ADCPro is a trademark of Texas Instruments. Windows is a registered trademark of Microsoft Corporation. C is a trademark of NXP Semiconductors. Samtec is a trademark of Samtec, Inc. All other trademarks are the property of their respective owners.
Page 2: Table Of Contents
J1: Analog Interface Pinout (Samtec 10 x 2) ......................SMA Analog Inputs ....................J2: Serial Interface Header ..................J3: Power-Supply Interface Header ..................ADS8861EVM Bill of Materials ADS8861EVM-PDK SBAU214 – October 2013 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated...
Page 3: Ads8861Evm-Pdk Overview
Thus, the EVM is available as part of the ADS8861EVM-PDK kit that combines the ADS8861EVM as a daughter board with the DSP-based MMB0 motherboard using ADCPro™ software as a graphical user interface (GUI).
Page 4: Evm Analog Interface
1k A0(-) 10 -2.15V +4.3V 10000pF Vocm =+2.25V THS4521 +2.15V -4.3V 10 A0(+) 1k AINN -2.15V 4.4V 10 1k 2.25V 0.1V Figure 1. Differential Input Example ADS8861EVM-PDK SBAU214 – October 2013 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated...
Page 5: Single-Ended Signal Example
1µF Vref THS4281 1k OPA333 1k 4.5V from 0.22 REF5045 1µF 1µF 10µF Figure 3. THS4281 Reference Driver with Complementary OPA333 for Drift and Offset Correction SBAU214 – October 2013 ADS8861EVM-PDK Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated...
Page 6: Evm Digital Interface
C bus that records the board name and assembly date to communicate with the onboard EEPROM. This bus is not used in any form by the ADS8861 converter. ADS8861EVM-PDK SBAU214 – October 2013 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated...
Page 7: Evm Power-Supply Inputs
The EVM only has one ground plane for analog and digital supplies; thus, pins J3.5 and J3.6 are tied together to this ground plane. Therefore, both supply grounds should be connected to pins J3.5–6 in order to share the same ground. SBAU214 – October 2013 ADS8861EVM-PDK Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated...
Page 8: Evm Digital Configuration
3-state. Figure 5 shows this configuration. DVDD 20k J2:1 or J2:7 ADS8861 SCLK (CLOSED) CONVST CONVST CONVST J2:17 Figure 5. Serial 4-Wire Configuration ADS8861EVM-PDK SBAU214 – October 2013 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated...
Page 9: Pdk Kit Setup
NOTE: ADCPro should be installed before attempting to install the ADS8861EVM-PDK plug-in software. The installation file link for the PDK plug-in can be found in the ADS8861EVM-PDK product folder at www.ti.com/tool/ads8861evm-pdk. In the software section, look for a link with a file named ads886x- adcproplugin-<version #>.exe (<version #>...
Page 10: Mmb0 Motherboard Jumper Configuration
PDK Kit Setup www.ti.com Configuring the ADS8861EVM-PDK Hardware The ADS8861EVM-PDK contains both the ADS8861EVM and the MMB0 motherboard; however, the devices may be shipped unconnected or configured incorrectly. Follow these steps to verify that the ADS8861EVM-PDK kit is properly configured and connected.
Page 11: Pdk Kit Operation
PDK. Powering up the ADS8861EVM-PDK When the ADS8861EVM-PDK kit is configured, power can be applied to the MMB0. This power comes from a wall supply that delivers 6 VDC to the MMB0 through J2 on the MMB0 motherboard. This wall power supply is included with the PDK.
Page 12: Loading Evm Plug-In
Step 5. When the plug-in is loaded, the plug-in searches for the board. A series of messages in the status area indicates this action, eventually showing Connected to EVM. The plug-in is now loaded and ready to function with the ADS8861EVM. ADS8861EVM-PDK SBAU214 – October 2013 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated...
Page 13: Ads8861Evm Plug-In: Device Configuration Tab
Note that the device name displayed is ADS8881 instead of ADS8861 because the main software is based on the ADS8881 device. • Collection bar: This feature shows the percentage of data collected during an acquisition session. SBAU214 – October 2013 ADS8861EVM-PDK Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated...
Page 14: Bill Of Materials, Schematics, And Layout
Troubleshooting If the ADS8861EVM plug-in cannot find the ADS8861EVM-PDK, press the RESET button on the MMB0 and try again. If ADCPro stops responding while the ADS8861EVM-PDK is connected, shut down and restart the ADCPro software.
Page 15: Ads8861Evm Bill Of Materials
— IC OPAMP DIFF R-R 145MHZ 8MSOP Texas Instruments THS4521IDGK — IC EEPROM 256KBIT 400KHZ 8TSSOP Microchip 24LC256-I/ST — — 0.100 Shunt - Black Shunts 969102-0000-DA SBAU214 – October 2013 ADS8861EVM-PDK Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated...
Page 16: Ads8861Evm Pcb: Top Layer
NOTE: Board layouts are not to scale. These figures are intended to show how the board is laid out; these figures are not intended to be used for manufacturing ADS8861EVM PCBs. Figure 12. ADS8861EVM PCB: Top Layer Figure 13. ADS8861EVM PCB: Ground Layer ADS8861EVM-PDK SBAU214 – October 2013 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated...
Page 17: Ads8861Evm Pcb: Power Layer
Bill of Materials, Schematics, and Layout www.ti.com Figure 14. ADS8861EVM PCB: Power Layer Figure 15. ADS8861EVM PCB: Bottom Layer SBAU214 – October 2013 ADS8861EVM-PDK Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated...
Page 18: Ads8861Evm Schematic
Bill of Materials, Schematics, and Layout www.ti.com Schematic Figure 16. ADS8861EVM Schematic ADS8861EVM-PDK SBAU214 – October 2013 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated...
Page 19 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.
Page 20 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue.
Page 21 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Texas Instruments ADS8861EVM-PDK...