Texas Instruments ADS833 EVM Series Manual de usuario

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, four-

or eight-channel, successive approximation register (SAR) analog-to-digital converter (ADC). The EVM

allows evaluation of all aspects of the ADS8331 and ADS8332. Complete circuit descriptions, schematic

diagrams, and bills of material are included in this document.

The following related documents are available for download through the Texas Instruments web site at

http://www.ti.com.

Related Documentation

Device Literature Number

ADS8331 SBAS363

ADS8332 SBAS363

REF5040 SBOS410

OPA350 SBOS099

TL750L05 SLVS017

I2C is a trademark of NXP Semiconductors.

All other trademarks are the property of their respective owners.

SBAU176A–August 2010–Revised May 2011 ADS833xEVM User's Guide

EVM Overview

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Contents

1 EVM Overview ............................................................................................................... 2

2 Analog Interface ............................................................................................................. 3

3 Digital Interface .............................................................................................................. 4

4 Power Supplies .............................................................................................................. 5

5 Voltage Reference .......................................................................................................... 5

6 Clock Source ................................................................................................................ 5

7 EVM Operation .............................................................................................................. 6

8 Schematics and Layout .................................................................................................... 8

List of Figures

1 ADS833xEVM ............................................................................................................... 3

2 ADS833xEVM Default Jumper Locations................................................................................ 6

3 ADS833xEVM: Top Layer................................................................................................ 10

4 ADS833xEVM: Bottom Layer............................................................................................ 10

List of Tables

1 J1: Analog Interface Pinout................................................................................................ 3

2 J2: Serial Interface Pins.................................................................................................... 4

3 J3 Configuration: Power-Supply Input.................................................................................... 5

4 List of Configured Jumpers................................................................................................ 7

5 Bill of Materials ............................................................................................................. 8

1 EVM Overview

1.1 Features

ADS833xEVM:

•Contains all support circuitry needed for the ADS8331 or ADS8332

•Voltage reference options: external or onboard

•Master clock options: Internal oscillator or external clock source

•Onboard buffer circuit to drive ADC inputs

•Compatible with the TI Modular EVM System

Throughout this document, the abbreviation EVM and the term evaluation module are synonymous with

the ADS833xEVM. The abbreviations ADS833x or ADS8331/2 refer to the ADS8331 and ADS8332,

unless otherwise indicated.

2ADS833xEVM User's Guide SBAU176A–August 2010–Revised May 2011

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Analog Interface

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.

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. This header/socket provides access to the analog input pins of

the ADS8331/32. Consult Samtec at http://www.samtec.com or call 1-800-SAMTEC-9 for a variety of

mating connector options.

The input pins on the ADS833xEVM are directly connected to the part, with no filtering or protection. It is

important that appropriate caution is taken when handling the pins. Table 1 summarizes the pinouts for

analog interface J1.

Table 1. J1: Analog Interface Pinout

Pin Number Signal Description

J1.1 - J1.19 (odd) GND Analog ground connections

J1.2 IN0 IN0 analog input

J1.4 IN1 IN1 analog input

J1.6 IN2 IN2 analog input

J1.8 IN3 IN3 analog input

J1.10 NC/IN4 IN4 analog input (ADS8332 only)

J1.12 NC/IN5 IN5 analog input (ADS8332 only)

J1.14 NC/IN6 IN6 analog input (ADS8332 only)

J1.16 NC/IN7 IN7 analog input (ADS8332 only)

J1.18 GND Analog ground connection

J1.20 REF+ External reference source input (positive)

SBAU176A–August 2010–Revised May 2011 ADS833xEVM User's Guide

Digital Interface

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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. Table 2 describes the J2 serial interface pins.

Table 2. J2: Serial Interface Pins

Pin No. Pin Name Signal Name I/O Type Pull-Up Function

J2.1 CNTL CS/FS In None CS/FS signal (see

jumper JP4)

J2.2 GPIO0 Unused — —

J2.3 CLKX SCLK In None ADS833x SPI clock

J2.4 DGND DGND In/Out None Digital ground

J2.5 CLKR SCLK In None ADS833x SPI clock

J2.6 GPIO1 Unused — —

J2.7 FSX CS/FS In None CS/FS signal (see

jumper JP4)

J2.8 GPIO2 Unused — —

J2.9 FSR CS/FS In None CS/FS signal (see

jumper JP4)

J2.10 DGND DGND In/Out None Digital ground

J2.11 DX DIN In None ADS833x SPI data in

J2.12 GPIO3 Unused — —

J2.13 DR DOUT Out None ADS833x SPI data out

J2.14 GPIO4 Unused — —

J2.15 INT EOC/INT/CDI In/Out None Status output/

Daisy-chain input

J2.16 SCL SCL In/Out High I2C™clock for

EEPROM

J2.17 TOUT CONVST In High Convert start signal

J2.18 DGND DGND In/Out None Digital ground

J2.19 GPIO5 RESET In High Reset signal, active low

J2.20 SDA SDA In/Out High I2C data for EEPROM

Note that many of the pins on J2 are connected directly to the ADS8331/32. Some of the control signals

on the EVM may have weak pull-up resistors to provide default settings for the pins. See the ADS8331

and ADS8332 product data sheet for complete details on these pins.

4ADS833xEVM User's Guide SBAU176A–August 2010–Revised May 2011

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Power Supplies

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

J3.2 –VA –10V to –15V Yes

J3.3 +5VA +5V analog supply No

J3.4 –5VA –5V analog supply No

J3.5 DGND Digital ground input Yes

J3.6 AGND Analog ground input Yes

J3.7 +1.8VD 1.8V digital supply No

J3.8 VD1 Unused No

J3.9 +3.3VD 3.3V digital supply Yes/Optional

J3.10 +5VD +5V Yes/Optional

The ADS833xEVM board requires several power supplies in order to power all of the installed

components. The onboard OPA211 drives the ADC input. In order to have the full common-mode input

range of 0V to 4.096V, the OPA211 requires ±10V power supplies. The +10V power supply is also used to

power the REF5040 and TL750L05 +5V regulator. The +5V derived from the low-dropout regulator (LDO)

powers the +VA analog voltage source for the ADS833x and the OPA350, which drives the reference

input.

The benefit of using a regulator to create +5V ensures that the ADC and OPA350 are powered at the

same time as the input drive circuitry. Otherwise, applying power to the OPA211 and attempting to drive

the ADC inputs before powering on the ADS833x could cause potential damage or cause the ADC to

power up in an unknown state.

The digital voltage supply for the ADS833x is controlled by jumper JP7. By default, the jumper is in the 1-2

position, set to use the +5VD to power the ADC VBD supply. The +3.3VD supply is also an option.

5 Voltage Reference

The ADS833xEVM comes with an onboard Texas Instruments' REF5040. The reference voltage signal

can either be connected directly to the ADS8331/32 or filtered through a OPA350 unity gain buffer before

connection to the ADC. Jumpers JP5 and JP12 control whether the reference voltage signal is routed

through the OPA350 buffer or connected directly to the ADC.

It is recommended that the power supply be turned off while setting the jumper settings to control whether

or not the reference buffer is enabled. Doing so will verify that the EVM is not damaged as the OPA350 is

switched in or out. If you are unable to turn off the power, care must be taken with regard to the order that

JP5 and JP12 are changed when changing from the OPA350 buffer. When bypassing the OPA350, make

sure that the JP12 jumper is removed first, before the JP5 jumper is moved to the 2-3 position. This

procedure ensures that the reference signal is not driven from two different places.

The ADS833xEVM board is designed to either use the onboard 4.096V reference from the REF5040 or an

external source that can be connected to header J1. Jumper J6 is used to select the ADC reference

source.

6 Clock Source

The clock for the ADS8331/32 can come from one of two sources: the ADC internal oscillator or externally

using the SCLK (SCLK/2). Pin J2.3 is used for the SCLK input.

SBAU176A–August 2010–Revised May 2011 ADS833xEVM User's Guide

EVM Operation

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7 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. Each channel currently has installed 0Ωresistors in series and pads to

install a capacitor (left open by default). Simply replacing the 0Ωresistor and installing a capacitor creates

a low-pass filter. Note that each of these analog inputs are referenced to the analog ground of the EVM

board.

The ADS833xEVM also has the option to use an onboard signal conditioning filter between the mux and

ADC input. Using signal conditioning here helps to minimize the cost of a design by allowing the user to

drive all eight of the analog input channels using a single op amp. In the EVM design, the OPA211 is used

in a unity-gain configuration in combination with a 34.8Ωand 750pf first-order RC filter. This configuration

has been tested to meet the ac specifications in the ADS8331 and ADS8332 product data sheet. See the

appendix for a complete schematic of the EVM board.

7.2 Digital Control

The digital control signals can be applied directly to J6 (top or bottom side). The modular ADS833xEVM

can also be connected directly to a DSP or microcontroller interface board, such as the 5-6K Interface

EVM or HPA-MCU Interface boards available from Texas Instruments. For a list of compatible interface

and/or accessory boards for the EVM or the ADS8331/32, see the relevant product folder on the TI web

site.

7.3 Default Jumper Settings and Switch Positions

Figure 2 shows the jumpers found on the EVM and the respective factory default conditions for each.

Figure 2. ADS833xEVM Default Jumper Locations

6ADS833xEVM User's Guide SBAU176A–August 2010–Revised May 2011

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EVM Operation

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. The OPA211 in a unity-gain configuration is placed between the MUXOUT

and ADCIN pins to give an example of how to drive any of the input channels using a single op amp. All of

the hardware options found on the ADS833xEVM are controlled through jumpers and switches.

Jumper JP3 controls whether the OPA211 unity-gain buffer, used to drive the analog input signals, is

enabled or bypassed. By default, JP3 is in the 1-2 position to route the signal through the op amp buffer

and RC filter before reaching the converter input. Moving the jumper to the 2-3 position bypasses the

OPA211 and routes the input signal only through a first-order, low-pass filter.

Jumper JP4 is used to route the FS/CS signal from the ADS8331/32 to either pin J2.1 or J2.7 and J2.9.

By default, the jumper is in the 2-3 position, routing the signal to J2.7 and J2.9.

As mentioned previously, the ADS833xEVM has the option to use an onboard OPA350 to drive the

reference voltage. Two jumpers are used to route the reference voltage through the op amp. JP5 routes

the signal through the OPA350 and JP12 connects the op amp output to the ADC reference voltage. Both

jumpers must be properly placed in order to use or bypass the reference buffer. By default, JP5 is in the

1-2 position and JP12 is installed, routing the reference voltage through the OPA350 and connecting it to

the ADC reference. If JP12 is removed and JP5 is in the 2-3 position, the OPA350 can be bypassed. See

the Reference Voltage section for more information on bypassing the op amp.

JP6 selects the reference source. By default, JP6 is in the 1-2 using the REF5040 installed on the EVM. If

an external reference voltage is needed, simply set JP6 to the 2-3 position. An external reference signal

can then be applied to pin 20 on the J1 header.

Jumper JP7 selects between using a +3.3VD or +5VD voltage to power the +VBD signal of the ADC. By

default, the jumper is in the 1-2 position to use +5VD.

JP9 allows you to use an external source to trigger the CONVST. By default, the jumper is installed

routing the CONVST signal to the J2 header. If the jumper is removed, the CONVST signal can be

controlled via an external source to the jumper pin.

Additionally, there is one switch used to control the RESET signal of the ADC. S1 is a pushbutton switch

used to perform a hardware reset of the ADC.

Table 4 lists the jumpers found on the EVM and the factory default conditions for each of the configurable

jumpers.

Table 4. List of Configured Jumpers

Jumper Default Position Switch Description

Enable the OPA211 buffer amplifier to drive ADC

JP3 1-2 inputs

JP4 2-3 Route CS signal to J2.7 and J2.9

Enable the OPA350 buffer amplifier to drive

JP5 1-2 reference voltage

JP6 1-2 Use onboard REF5040 for ADC reference

JP7 1-2 +VBD to +5V

JP9 Installed Connect CONVST signal to J2 header

JP12 Installed Route reference signal from OPA350 to ADC

SW1 N/A Pushbutton switch to control Reset signal

SBAU176A–August 2010–Revised May 2011 ADS833xEVM User's Guide

Schematics and Layout

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8 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

ADS8331 ADS8332

Item No. Qty Qty Ref Des (1) Description Manufacturer Part Number

1 0 0 C1, C2, C3, C4, Not installed

C5, C6, C7, C8

2 5 5 C11, C18, C22, Capacitor, ceramic 10UF 6.3V X5R 20% TDK C1608X5R0J106M

C25, C27 0603

3 3 3 C16, C23, C34 Capacitor, ceramic 10UF 10V X5R 10% Murata GRM219R61A106KE44D

0805

4 6 6 C12, C13, C15, Capacitor, ceramic 0.1UF 16V 10% X7R Murata GRM188R71C104KA01D

C24, C28, C30 0603

5 2 2 C17, C31 Capacitor, ceramic 1.0UF 16V X5R 10% TDK C1608X5R1C105K

0603

6 1 1 C26 Capacitor, ceramic 1000PF 50V 5% Murata GRM1885C1H102JA01D

C0G 0603

7 2 2 C32, C33 Capacitor, tantalum 10UF 35V 20% Kemet B45196H6106M309

SMD

8 1 1 C35 Capacitor, tantalum 22UF 20V 10% Kemet T491C226K020AT

SMD

9 2 2 J1A, J2A (Top 10-pin, Dual row, SM header (20 Pos.) Samtec TSM-110-01-T-DV-P

Side)

10 2 2 J1B, J2B (Bottom 10-pin, Dual row, SM header (20 Pos.) Samtec SSW-110-22-F-D-VS-K

Side)

11 1 1 J3A (Top Side) 5-pin, Dual low, SM header (10 Pos.) Samtec TSM-105-01-T-DV-P

12 1 1 J3B (Bottom Side) 5-pin, Dual row, SM header (10 Pos.) Samtec SSW-105-22-F-D-VS-K

13 5 5 JP3, JP4, JP5, Header strip, 3 pin (1x3) Samtec TSW-103-07-L-S

JP6, JP7

14 0 0 JP8 Not installed

15 2 2 JP9, JP12 Header strip, 2 pin (1x2) Samtec TSW-102-07-L-S

6 6 R1, R2, R3, R4, Resistor, 0Ω1/10W 5% 0603 SMD Panasonic ERJ-3GEY0R00V

R15, R16

16 0 0 R5, R6, R7, R8 Not installed

0 4 Resistor, 0Ω1/10W 5% 0603 SMD Panasonic ERJ-3GEY0R00V

17 2 2 R13, R22 Resistor, .47Ω1/10W 5% 0603 Panasonic ERJ-3RQJR47V

18 7 7 R14, R27, R28, Resistor, 33Ω1/10W 5% 0603 SMD Panasonic ERJ-3GEYJ330V

R29, R33, R34,

R35

19 4 4 R17, R18, R25, Resistor, 10kΩ1/10W 5% 0603 SMD Yageo RC0603JR-0710KL

R36

20 2 2 R19, R20 Resistor, 4.99kΩ1/10W 1% 0603 SMD Panasonic ERJ-3EKF4991V

21 1 1 R26 Resistor, 34.8Ω1/10W 1% 0603 SMD Panasonic ERJ-3EKF34R8V

22 0 0 R30, R31, R32 Not installed

23 1 1 S1 Switch, LT 6MM Panasonic EVQ-PHK03T

24 5 5 TP1, TP2, TP3, Test point - Single .025 pin, red Keystone 5000

TP7, TP10

25 2 2 TP11, TP12 Test point - Single .025 pin, black Keystone 5001

26 1 1 U1 IC LDO pos-volt reg 5V 8-SOIC Texas TL750L05CDR

Instruments

27 3 3 U2 IC Op Amp GP R-R 80MHZ SGL 8SOIC Texas OPA211ID

Instruments

(1) The following reference designators are not used:

•C9, C10, C14, C19, C20, C21, C29, R9, R10, R11, R12, R21, R23, R24, TP4, TP5, TP6, TP8, TP9, JP1, JP2, JP10, JP11, U6

8ADS833xEVM User's Guide SBAU176A–August 2010–Revised May 2011

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Schematics and Layout

Table 5. Bill of Materials (continued)

ADS8331 ADS8332

Item No. Qty Qty Ref Des (1) Description Manufacturer Part Number

1 0 U3 IC ADC 16-bit 500kSPS 4-Ch 24VQFN Texas ADS8331IBRGET

Instruments

28 0 1 U3 IC ADC 16-bit 500kSPS 8-Ch 24VQFN Texas ADS8332IBRGET

Instruments

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 REF5040AID

Instruments

31 1 1 U7 IC Op Amp GP R-R 38MHZ SGL 8SOIC Texas OPA350UA

Instruments

32 7 7 N/A 0.100 Shunt - black Samtec SNT-100-BK-T

SBAU176A–August 2010–Revised May 2011 ADS833xEVM User's Guide

Schematics and Layout

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Figure 3. ADS833xEVM: Top Layer

Figure 4. ADS833xEVM: Bottom Layer

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