Texas Instruments ADS1672EVM Manuale utente

User's GuideSBAU147 – March 2009

ADS1672EVM and ADS1672EVM-PDK User's Guide

ADS1672EVM (Left) and ADS1672EVM-PDK (Right)

This user's guide describes the characteristics, operation, and use of the ADS1672EVM, both by itself andas part of the ADS1672EVM-PDK. This evaluation module (EVM) is an evaluation platform for theADS1672 , a high-speed, single-channel, 24-bit, 625kHz delta-sigma analog-to-digital converter (ADC).The EVM allows evaluation of all aspects of the ADS1672 device using a standard serial CMOS interface.A complete circuit description, schematic diagram, and bill of materials are included.

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

EVM-Compatible Device Data Sheets

Device Literature Number

ADS1672 SBAS402REF5030 SBOS410THS4520 SLOS503REF5025 SBOS410OPA211 SBOS377PCA9535 SCPS129

ADCPro is a trademark of Texas Instruments.Microsoft, Windows are registered trademarks of Microsoft Corporation.All other trademarks are the property of their respective owners.

SBAU147 – March 2009 ADS1672EVM and ADS1672EVM-PDK User's Guide 1Submit Documentation Feedback

1 EVM Overview

2 Introduction

3 Analog Interface

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EVM Overview

ADS1672EVM Features:•Contains all support circuitry needed for the ADS1672•Voltage references onboard•Clock options: onboard 20MHz ceramic oscillator or adjustable frequency•GPIO access•Compatible with the TI Modular EVM System

ADS1672EVM-PDK Features:•Easy-to-use evaluation software for Microsoft

Windows

XP•Data collection to text files•Built-in analysis tools including scope, FFT, and histogram displays•Complete control of board settings•Easily expandable with new analysis plug-in tools from Texas Instruments

As a stand-alone unit, you can use the ADS1672EVM as a prototyping or troubleshooting tool.

For use with a computer, the ADS1672EVM-PDK is available. This kit combines the ADS1672EVM boardwith the DSP-based MMB0 motherboard, and includes ADCPro™ software for evaluation.

You can connect the ADS1672EVM through the MMB0 motherboard and then to a computer via anavailable USB port. This manual shows how to use the MMB0 as part of the ADS1672EVM-PDK, but doesnot provide technical details about the MMB0 itself.

ADCPro is a program for collecting, recording, and analyzing data from ADC evaluation boards. ADCProhas a number of plug-in programs, so it can be expanded easily with new test and data collection plug-ins.You control the ADS1672EVM-PDK with a plug-in that runs in ADCPro. For more information aboutADCPro, see the ADCPro™ Analog-to-Digital Converter Evaluation Software User's Guide (literaturenumber SBAU128 ), available for download from the TI web site.

This manual covers the operation of both the ADS1672EVM and the ADS1672EVM-PDK. It does notdescribe the MMB0 motherboard in detail. Throughout this document, the abbreviation EVM and the termevaluation module are synonymous with the ADS1672EVM.

The ADS1672EVM is an evaluation module built to the TI Modular EVM System specification. You canconnect the ADS1672EVM to any Modular EVM System interface card.

The ADS1672EVM is available as a stand-alone printed circuit board (PCB) or as part of theADS1672EVM-PDK, which includes an MMB0 motherboard and software. As a stand-alone PCB, theADS1672EVM is useful for prototyping designs and firmware development.

Note that the ADS1672EVM cannot run software. To connect it to a computer, some type of interface isrequired.

The ADS1672EVM board applies 5V of power (VCC) to the ADS1672 (U6) and THS4520 (U2). TheTHS4520, a wideband, fully-differential amplifier, drives the differential inputs of the ADS1672. This devicewas selected because of its slew rate (570V/ µs), settling time (7ns to 0.1%), low noise (2nV/ √Hz) and lowharmonic distortion (HD3: –123dBc at 100kHz).

SBAU147 – March 2009 ADS1672EVM and ADS1672EVM-PDK User's Guide 3Submit Documentation Feedback

THS4520 ADS1672

R56

R55 R14

R15

R12

R11

R5 R10

R9 R8

C10

(NI)

C18

C55

C14

(NI)

VCC

VCCRCM

RCM

-IN (J1 or

P3-1)

+IN (J2 or

P3-2)

R47

(NI)

R53

(NI)

R48

(NI)

R6 R50

(NI)

R54

(NI)

R13

(NI)

R49

(NI)

C64

(NI)

C65

(NI)

Analog Interface

4 Reference Buffer

OPA211

C52

47 Fm

C15

C19

C71

C26

R17

R33

R18

VREFP

+5VCC

C29 || C54 || C16

REF5030

OUT

TRIM

U4 C24

22 Fm

C73

47 Fm

C23

0.1 Fm

5 Power Supplies

Reference Buffer

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The ADS1672 reference pins have switched capacitor inputs. At a clock rate of 20MHz (X1), a chargeinjection in and out of the ADS1672 reference input occurs. The external reference voltage that drives theADS1672 reference pin must settle in less than 50ns. The REF5030 (U1) generates the 3.0V referencesignal (Figure 3 ). The output of the REF5030 is heavily filtered to remove noise. The onboard OPA211(U4) again filters and buffers the reference signal so that the reference signal noise to the ADS1672 isless than the noise generated by the converter itself. The OPA211 is a low-noise, unity-gain stableamplifier that provides a reliable current source for the ADS1672 reference input. The OPA211 and outputdecoupling capacitors work together to settle the VREFP (ADS1672) reference input voltage to within ±1/2LSB, every 50ns. This board uses a 22 µF ceramic capacitor with a 0.1 µF ceramic capacitor directlyacross the reference inputs, VREFP and VREFN. Note that the 22 µF and 0.1 µF capacitors are placed asclose to the ADS1672 reference pins as possible. These capacitors further reduce noise that is commonto both inputs. The ADS1672 VREFN pin goes to ground.

Figure 3. ADS1672 External Reference and Buffer

J4 (see Figure 1 ) is the power-supply input connector. Table 2 lists the configuration details for J4.

Table 2. J4 Configuration: Power-Supply Input

Pin No. Pin Name Function Required

J4.1 +VA +VCC OptionalJ4.2 –VA –VCC OptionalJ4.3 +5VA +5VCC AlwaysJ4.4 NC No connection NoJ4.5 NC No connection NoJ4.6 AGND Analog ground input AlwaysJ4.7 NC No connection NoJ4.8 NC No connection NoJ4.9 +3.3V 3.3V digital supply AlwaysJ4.10 NC No connection No

6ADS1672EVM and ADS1672EVM-PDK User's Guide SBAU147 – March 2009Submit Documentation Feedback

6 Digital Interface

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Digital Interface

It is easy to interface the ADS1672EVM board to multiple control platforms. The P2 connector (Figure 4 ,Samtec part number SSW-110-22-S-D-VS) provides a convenient digital access to the key ADS1672 I/Opins. Consult Samtec at http://www.samtec.com or call 1-800-SAMTEC-9 for a variety of mating connectoroptions.

SW1, a 10-position DIP switch (Figure 4 ), gives users the ability to change the setting of the ADS1672digital configuration pins when the EVM is used as a stand-alone evaluation board. Pull-up/-down resistorsare provided to set the static state of the digital configuration pins. All position settings for SW1 must beoff (factory default state) when the board

6.1 Serial Data Interface, P2

Digital Interface

6.2 Digital Control Signal PIN Configuration, SW1

7 Clock Source

5VCC

Connect When

Using Onboard

20MHz Clock

Internal or

External

Modular Clock

Select

INT

EXT

MCLK

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Clock Source

When using the I

C function through U5 (with or without ADCPro connected), all SW1 switches should bein the OFF position (see Figure 4 ).

The data clock and data out communications are directed through P2. All remaining ADS1672 digitalcontrol pins are configured with SW1. Table 4 describes the settings of the digital configuration switches.

The shunt on W3 must be moved to cover pin positions 2 and 3 in order to use the external clock appliedto J3. The control signal operating modes in Table 4 are further explained in the ADS1672 data sheet.

Note: All SW1 switches must be configured in the OFF position when using ADCPro software.

Table 4. SW1: Supplemental Analog Interface Pinout

Pin Number Signal Description

Data rate selection, bit 1 (oversamplingSW1.1 DRATE2

ratio select pin)Data rate selection, bit 0 (oversamplingSW1.2 DRATE1

ratio select pin)SW1.3 NC No connection

Digital filter path selection: If FPATH = '0',SW1.4 FPATH then path is wide-bandwidth; if FPATH ='1', then path is low-latencyConfigure low-latency digital filter: IfLL_CONFIG =

5VCC

Disconnect When

Using External Clock

Internal or

External

Modular Clock

Select

INT

EXT

MCLK

8 Use as a Stand-Alone EVM

9 EVM Operation

9.1 Analog Input

9.2 Digital Control

FSX

GPIO

START Shorted for

ADCPro operation

Use as a Stand-Alone EVM

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Figure 6. W2 and W3 Jumpers for External Modulator Clock

The ADS1672EVM can be used as a stand-alone EVM, provided that the proper control signals areapplied to serial input connector P2 (top or bottom side). The required power supplies (+5VA and +3.3VD)can be connected directly to J4 pins 3 and 9 or test points TP5 and TP7, respectively. Both supplies arereferenced to J4 pin 6 or TP8, and should be sourced from clean, well-regulated lab supplies for bestperformance. The minimum control lines necessary are the active-low chip select ( CS) and START inputs,which are applied to P2 pins 1 and 7. If an external serial clock is desired, the signal is applied to P2 pin5. The ADS1672 digital configuration pins can be set statically by using SW1, or can be manipulatedthrough U5 by an I

C controller connected to P2 pins 16 and 20 (all SW1 positions must be set to offwhen using U5). For additional details, please see section Section 9 of this document and review theADS1672 datasheet.

This section provides information on the analog input, digital control, and general operating conditions ofthe ADS1672EVM.

The differential

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