Analog Devices EVAL-AD7276SDZ User manual

EVAL-AD7276SDZ User Guide
UG-450
One Technology Way •P. O . Box 9106 •Norwood, MA 02062-9106, U.S.A. •Tel: [phone] •Fax: [phone] •www.analog.com
Evaluating the AD7276, 3 MSPS, 12-Bit ADC
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.Rev. 0 | Page 1 of 20
FEATURES
Full featured evaluation board for the AD7276
PC control in conjunction with the system demonstration
platform (EVAL-SDP-CB1Z)
PC software for control and data analysis (time and
frequency domain)
Standalone capability
EVALUATION KIT CONTENTS
EVAL-AD7276SDZ evaluation board
Evaluation software CD for the AD7276
9 V mains power supply adapter
ADDITIONAL EQUIPMENT NEEDED
EVAL-SDP-CB1Z system demonstration platform, includes a
USB cable
Precision analog signal source
SMB cables
PC running Windows XP SP2, Windows Vista, or Windows 7
with USB 2.0 port
ONLINE RESOURCES
Documents
AD7276 data sheet
EVAL-AD7276SDZ user guide
Required Software
EVAL-AD7276SDZ evaluation software
GENERAL DESCRIPTION
The EVAL-AD7276SDZ is a full featured evaluation board that can
be used to easily evaluate all features of the AD7276. The AD7276
is a 12-bit, high speed, low power successive approximation ADC.
The part operates from a single 2.35 V to 3.6 V power supply and
features throughput rates of up to 3 MSPS. The part contains a
low noise, wide bandwidth track-and-hold amplifier that can
handle input frequencies greater than 55 MHz.
The evaluation board can be controlled via the system demon-
stration platform (SDP). The E VA L -SDP-CB1Z board allows
the evaluation board to be controlled via the USB port of a PC
using the AD7276 evaluation software. The EVA L-AD7276SDZ
generates all required power supplies on board and supplies power
to the E VAL -SDP-CB1Z controller board. On-board components
include the following:
AD8022: dual high speed, low noise op amp
ADA4000-1: single, low cost, precision JFET input operational
amplifier
AD780: 2.5 V/3.0 V ultrahigh precision band gap voltage
reference
ADP1613: step-up PWM dc-to-dc switching converter
ADP1720: 50 mA, high voltage, micropower linear regulator
ADP7104: 20 V, 500 mA, low noise, CMOS LDO
ADM1185: quad voltage monitor and sequencer
ADG3308: low voltage, 1.15 V to 5.5 V, 8-channel bidirectional
logic level translator
FUNCTIONAL BLOCK DIAGRAM
Figure 1.
5V
+
–
VCC
VAMP–
VAMP+
GND
GND
VIN
VIN
UNBIASED
EVAL-AD7276SDZ
EVAL-SDP-CB1Z
CONTROLLER
BOARD
BF527
DSP
SERIAL
INTERFACE
AD7276
GND
V
DD
SDATA
SCLK
CS
V
IN
ADG3308
LEVEL
SHIFTER
OP AMP
SUPPLIES
VIN GND
7V TO
9V
DC
INPUT JACK
VIN
ON-BOARD
POWER SUPPLIES
ADP7104
SDP +5V
ADP1720
+3.3V
ADP1613
±5V
ADM1185
POWER
SEQUENCER
ADA4000-1
BUFFER
ADA4000-1
BUFFER
AD8022
BIAS-UP
CIRCUIT
AD780
REF
48MHz
SCLK
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TABLE OF CONTENTS
Features .............................................................................................. 1
Evaluation Kit Contents................................................................... 1
Additional Equipment Needed....................................................... 1
Online Resources.............................................................................. 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Getting Started .................................................................................. 3
Quick Start Steps .......................................................................... 3
Software Installation Procedures................................................ 4
Evaluation Board Setup Procedures........................................... 7
Evaluation Board Hardware ............................................................ 8
AD7276 Device Description ....................................................... 8
Power Supplies .............................................................................. 8
Link Configuration Options ........................................................... 9
Setup Conditions .......................................................................... 9
Evaluation Board Circuitry........................................................... 11
Analog Inputs ............................................................................. 11
Reference Options...................................................................... 11
Sockets/Connectors ................................................................... 11
Modes of Operation ....................................................................... 12
SDP Controlled Mode ............................................................... 12
Standalone Mode........................................................................ 12
How to Use the Software for Evaluating the AD7276 ............... 13
Setting Up the System for Data Capture ................................. 13
Overview of the Main Window................................................ 15
Generating a Waveform Analysis Report................................ 16
Generating a Histogram of the ADC Code Distribution ..... 17
Generating a Fast Fourier Transform of AC Characteristics ......18
Generating a Summary of the Waveform, Histogram, and
Fast Fourier Transform.............................................................. 19
Related Links................................................................................... 20
REVISION HISTORY
4/13—Revision 0: Initial Version

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GETTING STARTED
QUICK START STEPS
To begin using the evaluation board, do the following:
1. With the EVA L-SDP-CB1Z board disconnected from the
USB port of the PC, install the AD7276 evaluation board
software from the CD included in the evaluation board kit.
The PC must be restarted after the software installation is
complete. (For complete software installation instructions,
see the Software Installation Procedures section.)
2. Connect the E VAL -SDP-CB1Z board to the E VAL -
AD7276SDZ board as shown in Figure 2. Screw the two
boards together using the nylon screw-nut set included in
the evaluation board kit to ensure that the boards are
connected firmly together.
3. Connect the 9 V power supply adapter included in the
evaluation board kit to Connector J1 on the E VA L-
AD7276SDZ board.
4. Connect the E VAL -SDP-CB1Z board to the PC using the
supplied USB cable. If you are using Windows® XP, you may
need to search for the E VA L -SDP-CB1Z drivers. Choose to
automatically search for the drivers for the E VA L -SDP-CB1Z
board if prompted by the operating system.
5. Launch the EVAL -AD7276SDZ software from the Analog
Devices subfolder in the Programs menu.
Figure 2. Hardware Configuration—Setting up the EVAL-AD7276SDZ
(EVAL-AD7276SDZ on Left and EVAL-SDP-CB1Z on Right)
9V PSU
EVAL-SDP-CB1Z
USB TO PC
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SOFTWARE INSTALLATION PROCEDURES
The E VA L -AD7276SDZ evaluation kit includes a CD containing
software to be installed on your PC before you begin using the
evaluation board.
There are two parts to the installation:
•AD7276 evaluation board software installation
•EVA L-SDP-CB1Z system demonstration platform board
drivers installation
Warning
The evaluation board software and drivers must be installed
before connecting the evaluation board and E VA L -SDP-CB1Z
board to the USB port of the PC to ensure that the evaluation
system is correctly recognized when it is connected to the PC.
Installing the AD7276 Evaluation Board Software
To install the AD7276 evaluation board software,
1. With the EVA L-SDP-CB1Z board disconnected from the
USB port of the PC, insert the installation CD into the CD-
ROM drive.
2. Double-click the setup.exe file to begin the evaluation
board software installation. The software is installed to the
following default location: C:\Program Files\Analog
Devices\E VA L -AD7276_77_78SDZ\AD7276.
3. A dialog box appears asking for permission to allow the
program to make changes to your computer. Click Yes .
Figure 3. AD7276 Evaluation Board Software Installation:
Granting Permission for Program to Make Changes
4. Select the location to install the software, and then click Next.
Figure 4. AD7276 Evaluation Board Software Installation:
Selecting the Location for Software Installation
5. A license agreement appears. Read the agreement, and then
select I accept the License Agreement and click Next.
Figure 5. AD7276 Evaluation Board Software Installation:
Accepting the License Agreement
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6. A summary of the installation is displayed. Click Next to
continue.
Figure 6. AD7276 Evaluation Board Software Installation:
Reviewing a Summary of the Installation
7. A dialog box informs you when the installation is
complete. Click Next.
Figure 7. AD7276 Evaluation Board Software Installation:
Indicating When the Installation Is Complete
Installing the EVAL-SDP-CB1Z System Demonstration
Platform Board Drivers
After the installation of the evaluation board software is complete,
a welcome window is displayed for the installation of the EVAL -
SDP-CB1Z system demonstration platform board drivers.
1. With the EVA L-SDP-CB1Z board still disconnected from
the USB port of the PC, make sure that all other applications
are closed, and then click Next.
Figure 8. EVAL-SDP-CB1Z Drivers Setup:
Beginning the Drivers Installation
2. Select the location to install the drivers, and then click Next.
Figure 9. EVAL-SDP-CB1Z Drivers Setup:
Selecting the Location for Drivers Installation
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3. Click Install to confirm that you would like to install the
drivers.
Figure 10. EVAL-SDP-CB1Z Drivers Setup:
Granting Permission to Install Drivers
4. To complete the drivers installation, click Finish, which
closes the installation wizard.
Figure 11. EVAL-SDP-CB1Z Drivers Setup:
Completing the Drivers Setup Wizard
5. Before using the evaluation board, you must restart your
computer. A dialog box opens, giving you the following
options: Restart, Shut Down, Restart Later. Click the
appropriate button.
Figure 12. EVAL-SDP-CB1Z Drivers Setup:
Restarting the Computer
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EVALUATION BOARD SETUP PROCEDURES
The AD7276 evaluation board connects to the EVA L -SDP-
CB1Z system demonstration board. The E VA L -SDP-CB1Z
board is the controller board, which is the communication link
between the PC and the main evaluation board. Figure 2 shows
a photograph of the connections made between the AD7276
daughter board and the E VA L -SDP-CB1Z board.
After following the instructions in the Software Installation
Procedures section, set up the evaluation and SDP boards as
detailed in this section.
Warning
The evaluation software and drivers must be installed before con-
necting the evaluation board and E VAL -SDP-CB1Z board to
the USB port of the PC to ensure that the evaluation system is
correctly recognized when it is connected to the PC.
Configuring the Evaluation and SDP Boards
1. Connect the E VAL -AD7276SDZ board to Connector A or
Connector B of the EVAL -SDP-CB1Z board (see Figure 2).
a. Screw the two boards together using the nylon screw-
nut set included in the evaluation board kit to ensure
that the boards are connected firmly together.
2. Connect the 9 V power supply adapter included in the evalu-
ation board kit to Connector J1 of the EVA L-AD7276SDZ
board. (Alternatively, a bench power supply can be used to
power the EVA L-AD7276SDZ via Connector J2. See Table 1
for more information about the connections and options
for the required power supplies.)
3. Connect the E VAL -SDP-CB1Z board to the PC using the
supplied USB cable.

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EVALUATION BOARD HARDWARE
AD7276 DEVICE DESCRIPTION
The AD7276 can interface to microprocessors or DSPs.
The input signal is sampled on the falling edge of CS, and the
conversion is also initiated at this point. There are no pipeline
delays associated with the part.
The AD7276 uses advanced design techniques to achieve very
low power dissipation at high throughput rates.
The reference for the part is taken internally from VDD. This
allows the widest dynamic input range to the ADC; therefore,
the analog input range for the part is 0 V to VDD. The conversion
rate is determined by the SCLK.
For more information about the AD7276, refer to the AD7276 data
sheet, which should be used in conjunction with this user guide.
POWER SUPPLIES
The E VA L -AD7276SDZ can be used in two modes: SDP
controlled mode and standalone mode (see the Modes of
Operation section for more information).
When the E VA L -AD7276SDZ board is used in conjunction with
the EVA L-SDP-CB1Z board (SDP controlled mode), connect the
ac transformer to Connector J1 on the E VA L -AD7276SDZ
board. The VDD, +AMP, and −AMP supplies are generated on
board. When the E VAL -AD7276SDZ board is used in standalone
mode, the VDD and amplifier supplies must be sourced from
external sources (see Table 1).
Alternatively, a bench power supply can be connected to J2 to
supply 7 V to 9 V.
Table 1. External Power Supplies Required
Power Supply Connector Voltage Range Purpose
VIN1 J1 or J2 7 V to 9 V Supplies all on-board power supplies, generating all required voltages to run the
evaluation board
+AMP J3-3 +5 V Supplies the positive rail of the amplifier
−AMP J3-1 −5 V Supplies the negative rail of the amplifier
VDD J4 2.35 V to 3.6 V Supplies the VDD digital supply
1When VIN is supplied, all other power supplies are available on board. If the VIN supply is not used, all other power supplies must be sourced from an external source.

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LINK CONFIGURATION OPTIONS
There are multiple jumper (LKx) options that must be set
correctly to select the appropriate operating setup before you
begin using the evaluation board. The functions of these
options are outlined in Table 2.
SETUP CONDITIONS
Care should be taken before applying power and signals to the
evaluation board to ensure that all link positions are as required
by the operating mode. There are two modes in which to operate
the evaluation board. The evaluation board can be operated in
SDP controlled mode to be used with the SDP board, or the
evaluation board can be used in standalone mode.
Table 3 shows the default positions in which the links are set when
the evaluation board is packaged. When the board is shipped, it
is assumed that you are going to operate the evaluation board
with the SDP board (SDP controlled mode).
Table 2. Link Option Functions
Link No. Function
LK1 −AMP. Amplifier negative voltage supply selection.
Position A: the amplifier negative voltage is supplied from the on-board supply.
Position B: the amplifier negative voltage is supplied from an external source via J3 Terminal 1.
LK2 +AMP. Amplifier positive voltage supply selection.
Position A: the amplifier positive voltage is supplied from the on-board supply.
Position B: the amplifier positive voltage is supplied from an external source via J3 Terminal 3.
LK3 Bias-up voltage selection. Selects the voltage level that is supplied to U4.
Position A: the bias-up voltage level that is supplied to U4 is VDD.
Position B: the bias-up voltage level that is supplied to U4 is 0 V.
LK4 VDD source selection.
Position A: VDD is sourced from U5.
Position B: VDD is sourced externally via J4.
LK5 U5 output voltage selection.
Inserted: the U5 output voltage is 3.0 V.
Removed: the U5 output voltage is 2.5 V.
LK6 VIN unbiased input impedance selection.
Inserted: the VIN unbiased input impedance is 51 Ω.
LK7 CS signal.
Position A: the CS signal is connected to EVAL-SDP-CB1Z.
Position B: the CS signal is connected externally via J6.
LK8 Biased-up input signal.
Inserted: the biased-up input signal is connected to the U7 input buffer.
LK9 SCLK signal.
Position A: the SCLK signal is connected to EVAL-SDP-CB1Z.
Position B: the SCLK signal is connected externally via J8.
LK10 Buffer input source.
Position A: the input signal is connected to the U7 input buffer.
Position B: the input signal connected to the U7 input buffer is set to 0 V.
LK11 VIN input impedance selection.
Inserted: the VIN input impedance is 51 Ω.
LK12 SDATA signal.
Position A: the SDATA signal is connected to EVAL-SDP-CB1Z.
Position B: the SDATA signal is connected externally via J9.
Table 3. Default Link Positions for Packaged EVAL-AD7276SDZ
Link No. Position Function
LK1 A The amplifier negative voltage is supplied from the on-board supply.
LK2
A
The amplifier positive voltage is supplied from the on-board supply.
LK3 A The selected voltage level that is supplied to U4 is VDD.
LK4 A VDD is sourced from U5.

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Link No. Position Function
LK5 Inserted The U5 output voltage is 3.0 V.
LK6 Inserted The VIN unbiased input impedance is 51 Ω.
LK7 A The CS signal is connected to EVAL-SDP-CB1Z.
LK8 Inserted The biased-up input signal is connected to the U7 input buffer.
LK9 A The SCLK signal is connected to EVAL-SDP-CB1Z.
LK10 A The input signal is connected to the U7 input buffer.
LK11 Inserted The VIN input impedance is 51 Ω.
LK12 A The SDATA signal is connected to EVAL-SDP-CB1Z.