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User's Guide

SBAU167–March 2010

ADS1209EVM

This user's guide describes the characteristics, operation, and use of the ADS1209EVM. This EVM is an

evaluation module for the ADS1209, a two-channel, high-performance, delta-sigma (ΔΣ) modulator

designed for use with the AMC1210, a four-channel digital filter designed specifically for current

measurement and resolver position decoding in motor control applications. The ADS1209EVM is designed

for prototyping and evaluation. A complete circuit description, schematic diagram, and bill of materials are

included.

The following related documents are available through the Texas Instruments web site at www.ti.com.

Device Literature Number

ADS1209 SBAS491

AMC1210 SBAS372

Contents

1 ADS1209EVM Overview ................................................................................................... 2

1.1 Features ............................................................................................................. 2

1.2 Introduction ......................................................................................................... 2

2 Analog Interface ............................................................................................................. 2

2.1 Analog Inputs ....................................................................................................... 3

3 Digital Interface .............................................................................................................. 3

4 Power Supplies .............................................................................................................. 4

5 EVM Operation .............................................................................................................. 4

5.1 Analog Inputs: J1 .................................................................................................. 4

5.2 Device Operation ................................................................................................... 5

6 BOM, Schematic, and Layout ............................................................................................. 5

6.1 Schematic ........................................................................................................... 5

6.2 Printed Circuit Board Layout ...................................................................................... 5

6.3 Bill of Materials ..................................................................................................... 6

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SBAU167–March 2010 ADS1209EVM

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Summary of content (9 pages)

PAGE 1
User's Guide SBAU167 – March 2010 ADS1209EVM This user's guide describes the characteristics, operation, and use of the ADS1209EVM. This EVM is an evaluation module for the ADS1209, a two-channel, high-performance, delta-sigma (ΔΣ) modulator designed for use with the AMC1210, a four-channel digital filter designed specifically for current measurement and resolver position decoding in motor control applications. The ADS1209EVM is designed for prototyping and evaluation.
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ADS1209EVM Overview 1 ADS1209EVM Overview 1.1 Features www.ti.com ADS1209EVM: • Full-featured evaluation module for the ADS1209 two-channel, ΔΣ modulator • 9-pin sub-D connector for interfacing to the AMC1210 digital filter evaluation module • Screw terminals for easy access to analog inputs 1.2 Introduction The ADS1209EVM is an evaluation board for the ADS1209 two-channel ΔΣ modulator.
PAGE 3
Digital Interface www.ti.com 2.1 Analog Inputs The analog input to the ADS1209EVM board consist of two simple R/C filter circuits. The input circuit for the ADS1209 is shown in Figure 1. R4 47 CHA+ C6 4700pF R3 CHAC4 NI 47 C5 NI J1 5 4 3 2 1 R2 47 CHB- C2 4700pF R1 CHB+ C1 NI 47 C3 NI Figure 1. ADS1209EVM Schematic: Analog Input Section 3 Digital Interface The ADS1209EVM is designed for use with digital filters such as the AMC1210.
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Power Supplies 4 www.ti.com Power Supplies J2 provides access to the +5 VA for the AVDD supply, and +2.7 to 5.5 VD for the +BVDD supply. It is recommended that all power to the board be sourced from a well-regulated linear supply with current-limiting capabilities. Power is to be applied through J2. Table 1 describes the pinout for J2. Table 1. J2: Power Supply and Digital Outputs Signal Pin Number Signal Ground 1 2 Not used 2.7 to 5.
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BOM, Schematic, and Layout www.ti.com 5.2 Device Operation Once the analog and digital power sources are applied to the ADS1209EVM, the digital outputs become active. The ADS1209 is configured to use its onboard oscillator by tying the clock in (CLKIN) and clock select (CLKSEL) pins to the applied digital power supply. The internal reference of the ADS1209 is used as the conversion reference inputs by tying the REFOUT pin to both REFIN A and REFIN B.
PAGE 6
BOM, Schematic, and Layout 6.3 www.ti.com Bill of Materials Table 3. ADS1209EVM Bill of Materials Reference Designator Vendor Part Number C1, C3, C4, C5 Not installed — — C2, C6 Capacitor, ceramic 4700pF 50V 10% X7R 0603 Murata GRM188R71H472KA01D C7 - C13 Capacitor, ceramic 0.1mF 50V 10% X7R 0603 Murata GRM188R71H104KA93D C14 Capacitor, ceramic 1mF 25V 10% X5R 0603 Murata GRM188R61E105KA12D C15, C16 Capacitor, ceramic 4.
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1 2 3 4 REVISION HISTORY REV ENGINEERING CHANGE NUMBER APPROVED D D AVDD C7 0.1uF C9 0.1uF C12 0.1uF BVDD 17 C13 0.1uF 1 12 13 24 C11 0.1uF BVDD AVDD 47 5 C6 4700pF 6 AVDD AVDD AVDD AVDD ADS1209 R4 7 J1 8 5 4 3 2 1 OUTB 21 5 9 4 8 3 7 2 6 1 MDAT1 20 MDAT2 CHB- R5 CHB+ 12 CLKOUT 19 C5 NI CLK1 R6 CLK2 12 BVDD C RS232 0.1uF C10 0.1uF R2 C14 1uF 47 REFINB REFINA REFOUT CLKIN CLKSEL 16 15 BGND C8 OST ED1517 10 3 23 AGND AGND AGND AGND C4 NI C15 4.
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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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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.