Analog Devices EVAL-AD7656-1SDZ User manual

Evaluation Board User Guide
UG-AD7656-1/57-1/58-1
One Technology Way •P. O . Box 9106 •Norwood, MA 02062-9106, U.S.A. •Tel: [phone] •Fax: [phone] •www.analog.com
Evaluating the AD7656-1/57-1/58-1
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS. Rev. PrA | Page 1 of 32
FEATURES
Full-featured evaluation board for the AD7656-1/57-1/58-1
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
The following evaluation boards are covered by this user guide:
EVAL-AD7656-1SDZ
EVAL-AD7657-1SDZ
EVAL-AD7658-1SDZ
EVAL-AD7656-1/57-1/58-1SDZ KIT CONTENTS
EVAL-AD7656-1/57-1/58-1SDZ Evaluation Board
Evaluation Software CD for the AD7656-1/57-1/58-1
9V Mains power supply adapter
ADDITIONAL EQUIPMENT NEEDED
System Demonstration platform (EVAL-SDP-CB1Z)
Precision Analog signal source
SMB cables
USB Cables
EVALUATION BOARD DESCRIPTION
This User Guide describes the evaluation board for the
AD7656-1/57-1/58-1 which are 16-/14-/12-, Six-Channel
Simultaneous
Sampling 250 ksps ADCs respectively. The AD7656-1/57-1/58-1
contains six 16-/14-/12- low power SAR ADCs. The parts
operate from a single 4.75V to 5.25V supply and dual ± 12V
power supply and feature throughput rates of up to 250 ksps.
Full details on the AD7656-1/57-1/58-1 are available in the
AD7656-1/57-1/58-1 datasheets which are available from
Analog Devices and should be consulted in conjunction with
this User Guide when using
the Evaluation Board.
On-board components include the:
AD8597: Ultralow Distortion, Ultralow Noise Op Amp
(single)
AD8031: 2.7 V, 800 μA, 80 MHz Rail-to-Rail I/O Single
Amplifier
ADP1613: Step-Up PWM DC-to-DC Switching
Converter,
ADP3303-5: High Accuracy anyCAP™ 200 mA Low
Dropout Linear Regulator
ADP2301: 1.2 A, 20 V, 1.4 MHz non-synchronous step-
down switching regulator
ADM1185: Quad Voltage Monitor and Sequencer
ADP190: Logic Controlled, High-Side Power Switch
ADG3308: Low Voltage, 1.15 V to 5.5 V, 8-Channel
Bidirectional Logic Level Translator
ADR431: Ultralow Noise XFET® Voltage References
with Current Sink and Source Capability
AD780: 2.5 V/3.0 V Ultrahigh Precision Bandgap
Voltage Reference.
Various link options are described in the Evaluation Board
Hardware section.

UG-AD7656-1/57-1/58-1 Evaluation Board User Guide
Rev. PrA | Page 2 of 32
FUNCTIONAL BLOCK DIAGRAM
CONVST_A..C
WR
DB0..15
AVCC
AD7656-1
EVAL-SDP-CB1Z
CONTROLLER
BOARD
5V
BF527
DSP
PARALLEL
INTERFACE
ON-BOARD
POWER SUPPLIES
VSS
ADG3308
LEVEL
SHIFTERS
VSS
VDRIVE
VIN
DC
INPUT
JACK
VDD
GND
RD
V1
+
-
AD780/
ADR431
Ref
REFIN/
REFOUT
VDRIVE
DVCC
GND
DGND GND
EVAL-AD7656-1SDZ
ADP3303
(x2) +5V
ADP2301
SDP 5V
ADP1613
+/-15V
ADP190
3.3V
AM1185
POWER
SEQUENCER
OP AMP
SUPPLIES
AD8597
VIN
VDD
7-9V
BUSY
CS
W/B
RANGE
SER/PAR_SEL
H/S_SEL
RESET
HARDWARE
SELECT
REFCAPA..
REFCAPC
DVCC
AD8597
AD8597
AD8597
AD8597
AD8597
V2
V3
V4
V5
V6
3.3VIO
V1
V2
V3
V4
V5
V6
AVCCAGND
Figure 1 Functional Block Diagram

Evaluation Board User Guide UG-AD7656-1/57-1/58-1
Rev. PrA | Page 3 of 32
TABLE OF CONTENTS
Features...............................................................................................1
EVAL-AD7656-1/57-1/58-1SDZ KIT Contents .......................1
Additional Equipment Needed........................................................1
Evaluation Board Description .........................................................1
Functional Block Diagram...............................................................2
Table of Contents...............................................................................3
Revision History................................................................................3
EVAL-AD7656-1/57-1/58-1SDZ Quickstart Guide .....................4
Recommended Quick Start GUIDE...........................................4
Evaluation Board Hardware.............................................................5
AD7656-1/57-1/58-1 Device Description .....................................5
Hardware Link Options................................................................6
Power Supplies.............................................................................11
parallel interface..........................................................................11
Serial Interface.............................................................................11
Digital interface...........................................................................11
Analog Inputs ..............................................................................11
Reference Options.......................................................................11
Sockets/Connectors....................................................................12
EVAL-AD7656-1/57-1/58-1SDZ Basic Hardware Setup....13
Evaluation Board SoftwarE............................................................14
Software Installation...................................................................14
Launching The Software ............................................................16
Software Operation.....................................................................16
Description of User Software panel..........................................17
WaveForm Capture.....................................................................19
AC Testing - Histogram .............................................................20
DC Testing - Histogram.............................................................20
AC Testing - FFT Capture..........................................................21
Summary Tab...............................................................................22
Save File........................................................................................23
Load File.......................................................................................23
Evaluation Board Schematics and Artwork.................................24
REVISION HISTORY
04/12—Revision Pr A

UG-AD7656-1/57-1/58-1 Evaluation Board User
Guide
Rev. PrA | Page 4 of 32
EVAL-AD7656-1/57-1/58-1SDZ QUICKSTART GUIDE
RECOMMENDED QUICK START GUIDE
To install the software do the following:
(1) Install the AD7656-1/57-1/58-1 Software from the
enclosed CD. Ensure the EVAL-SDP-CB1Z board is
disconnected from the USB port of the PC while
installing the software. The PC must be restarted after
the installation.
(2) Connect the EVAL-SDP-CB1Z board to the EVAL-
AD7656-1/57-1/58-1SDZ board as shown in Figure
1Figure 2.
(3) Screwing the two boards together with the enclosed
nylon screw-nut set will ensure the boards connect
firmly together.
(4) Connect the 9V power supply adapter included in the
kit to connecter J702 on the EVAL-AD7656-1/57-
1/58-1SDZ board.
(5) Connect the EVAL-SDP-CB1Z board to the PC via the
USB cable. For Windows XP you may need to search
for the EVAL-SDP-CB1Z drivers. Choose to
automatically search for the drivers for the EVAL-
SDP-CB1Z board if prompted by the operating
system.
(6) Launch the EVAL-AD7656-1/57-1/58-1SDZ software
from the Analog Devices subfolder in the Programs
menu.
Figure 2 Evauation Board connection
.

Evaluation Board User
Guide UG-AD7656-1/57-1/58-1
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS. Rev. PrA | Page 5 of 32
EVALUATION BOARD HARDWARE
AD7656-1/57-1/58-1 DEVICE DESCRIPTION
The AD7656-1/AD7657-1/AD7658-1 are reduced decoupling
pin and software-compatible versions of
AD7656/AD7657/AD7658. The AD7656-1/AD7657-
1/AD7658-1 devices contain six 16-/14-/12-bit, fast, low power
successive approximation ADCs in a package designed on the
iCMOS® process (industrial CMOS). iCMOS is a process
combining high voltage silicon with submicron CMOS and
complementary bipolar technologies. It enables the
development of a wide range of high performance analog ICs
capable of 33 V operation in a footprint that no previous
generation of high voltage parts could achieve. Unlike analog
ICs using conventional CMOS processes, iCMOS components
can accept bipolar input signals while providing increased
performance, which dramatically reduces power consumption
and package size.
The AD7656-1/AD7657-1/AD7658-1 feature throughput rates
of up to 250 kSPS. The parts contain low noise, wide bandwidth
track-and-hold amplifiers that can handle input frequencies
up to 4.5 MHz.
The conversion process and data acquisition are controlled
using the CONVST signals and an internal oscillator. Three
CONVST pins (CONVST A, CONVST B, and CONVST C)
allow independent, simultaneous sampling of the three ADC
pairs. The AD7656-1/AD7657-1/AD7658-1 have a high speed
parallel and serial interface, allowing the devices to interface
with microprocessors or DSPs. When the serial interface is
selected, each part has a daisy-chain feature that allows multiple
ADCs to connect to a single serial interface.
The AD7656-1/AD7657-1/AD7658-1 can accommodate true
bipolar input signals in the ±4 × VREF and ±2 × VREF ranges.
Each AD7656-1/AD7657-1/AD7658-1 also contains an on-chip
2.5 V reference.
.

UG-AD7656-1/57-1/58-1 Evaluation Board User
Guide
Rev. PrA | Page 6 of 32
HARDWARE LINK OPTIONS
There are 23 link options, which must be set for the required operating setup before using the evaluation board. The functions of these
options are outlined in Table 1. Shows the position in which all the links are set when the evaluation board is packaged. Jumper and
solder link (LKx) options must be set correctly to select the appropriate operating setup before using the evaluation board. The default
link positions are shown in Table 2 and the functions of these options are outlined in Table 1
Table 1 Link Options
Link No. Function
LK1
H/S_SEL Selection
Position A: Software input selected.
Position B: Hardware input selected.
LK2
VREF Buffer Signal Selection
Position A: Unbuffered.
Position B: Buffered by U10 AD8031 Op Amp.
LK3
WR/REFEN/DIS Signal Selection
Position A: Controlled by EVAL-SDP1Z.
Position B: Connected to external socket J7-2.
Position C: Connected to GND.
Position D: Connected to VDRIVE.
LK4 V1 input jumper. When inserted input is shorted to GND.
LK5 V2 input jumper. When inserted input is shorted to GND.
LK6
RANGE Selection
Position A: Connected to VDRIVE.
Position B: Connected to GND.
LK7 STBY Selection
Position A: Connected to VDRIVE.
Position B: Connected to GND.
LK8 RESET Selection
Position A: Connected to VDRIVE.
Position B: Connected to GND.
Position C: Controlled by EVAL-SDP1Z.
LK9
W/B Selection
Position A: Connected to VDRIVE.
Position B: Connected to GND.
LK10
BUSY Selection
Position A: Controlled by EVAL-SDP1Z.
Position B: Connected to external socket J7-12.
LK11
CONVST_A Selection
Position A: Connected to external socket J7-8.
Position B: Controlled by EVAL-SDP1Z.
Position C: Connected to GND.
LK12
CS Source Signal Selection
Position A: Controlled by EVAL-SDP1Z.
Position B: Connected to external socket J7-1.
LK13
VREF Source Signal Selection
Position A: Sourced from U5 AD780.
Position B: Sourced from U3 ADR431.
LK14 V3 input jumper. When inserted input is shorted to GND.

Evaluation Board User
Guide UG-AD7656-1/57-1/58-1
Rev. PrA | Page 7 of 32
Link No. Function
LK15 V4 input jumper. When inserted input is shorted to GND.
LK16
VDRIVE Source Signal Selection
Position A: Sourced from onboard 3.3V. (Requires the SDP1Z board to be connected) .
Position B: Connected to external socket J7-14.
LK17 V5 input jumper. When inserted input is shorted to GND.
LK18 V6 input jumper. When inserted input is shorted to GND.
LK19
REFIN/REFOUT Source Selection
Inserted: External Reference connected
Removed: External Reference disconnected.
LK20
SER/PAR_SEL Selection
Position A: Connected to VDRIVE.
Position B: Connected to GND.
LK21 U5 AD780 Voltage Output Selection
Inserted: Output is 3V.
Removed: Output is 2.5V.
LK22
CONVST_A / CONVST_B Link Selection
Connects CONVST_A to CONVST_B when inserted.
LK23
RD Source Signal Selection
Position A: Controlled by EVAL-SDP1Z.
Position B: Connected to external socket J7-3.
LK24
REFCAPA Source Selection
Inserted: External Reference connected
Removed: External Reference disconnected.
LK25
DB10 / SDATA_C Destination Selection
Position A: data to EVAL-SDP1Z.
Position B: data to external socket J7-6.
LK26
DB7 / HBEN / DCEN Selection
Position A: data to EVAL-SDP1Z.
Position B: Connected to VDRIVE.
Position C: Connected to GND.
LK27
DB9 / SDATA_B Destination Selection
Position A: data to EVAL-SDP1Z.
Position B: Not used
Position C: data to external socket J7-5.
LK28 DB8 / SDATA_C Destination Selection
Position A: data to EVAL-SDP1Z.
Position B: Not used
Position C: data to external socket J7-4.
LK29 DB14/REFBUF/DIS EN Selection
Position A: data to EVAL-SDP1Z.
Position B: Connected to VDRIVE.
Position C: Connected to GND.
LK30 DB6 / SCLK Selection
Position A: Connected to EVAL-SDP1Z.
Position B: Not used
Position C: Connected to external socket J7-11.

UG-AD7656-1/57-1/58-1 Evaluation Board User
Guide
Rev. PrA | Page 8 of 32
Link No. Function
LK31
DB2 / SEL_C Selection
Position A: data to EVAL-SDP1Z.
Position B: Connected to VDRIVE.
Position C: Connected to GND.
LK32
DB1 / SEL_B Selection
Position A: data to EVAL-SDP1Z.
Position B: Connected to VDRIVE.
Position C: Connected to GND.
LK33
DB0 / SEL_A Selection
Position A: data to EVAL-SDP1Z.
Position B: Connected to VDRIVE.
Position C: Connected to GND.
LK34
CONVST_B Selection
Position A: Connected to external socket J7-9.
Position B: Controlled by EVAL-SDP1Z.
Position C: Connected to GND.
LK35
CONVST_C Selection
Position A: Connected to external socket J7-10.
Position B: Controlled by EVAL-SDP1Z.
Position C: Connected to GND.
LK36
CONVST_A / CONVST_C Link Selection
Connects CONVST_A to CONVST_C when inserted.
LK1011
Op Amp negative rail source Selection
Position A: -12V supplied from on board supply
Position B: negative rail supplied from external source via J100 terminal 1
LK1021
Op Amp positive rail source Selection
Position A: 12V supplied from on board supply
Position B: positive rail supplied from external source via J100 terminal 3
LK103
LK104
LK105
LK106
Sets the VDD and VSS levels when using the onboard supplies
Link ±12V ±15V
LK103 POP NOPOP
LK104 NOPOP POP
LK105 NOPOP POP
LK106 POP NOPOP
POP = Place both 0Ω resistors.
NOPOP = Neither 0Ω resistor is placed.
LK701 DVCC Selection
Position A: DVCC supplied from on board 5V supply
Position B: DVCC supplied from external source via J701-1
LK702 AVCC Selection
Position A: AVCC supplied from on board 5V supply
Position B: AVCC supplied from external source via J701-1
SL1 REFCAPA / REFCAPB Link Selection
Connects REFCAPA to REFCAPB when soldered
SL2 REFCAPB / REFCAPC Link Selection
Connects REFCAPB to REFCAPC when soldered
SL3
to
SL14
Not used. Leave unsoldered

Evaluation Board User
Guide UG-AD7656-1/57-1/58-1
Rev. PrA | Page 9 of 32
Link No. Function
SL15
V1 Buffer Selection
Position A: Input signal buffered through U4
Position B: Input signal taken directly from J1
SL16
V2 Buffer Selection
Position A: Input signal buffered through U7
Position B: Input signal taken directly from J2
SL17
V3 Buffer Selection
Position A: Input signal buffered through U8
Position B: Input signal taken directly from J3
SL18
V4 Buffer Selection
Position A: Input signal buffered through U9
Position B: Input signal taken directly from J4
SL19
V5 Buffer Selection
Position A: Input signal buffered through U11
Position B: Input signal taken directly from J5
SL20
V3 Buffer Selection
Position A: Input signal buffered through U12
Position B: Input signal taken directly from J6
1 Both LK101 and LK102 should always be in corresponding positions.
Table 2 Link Options -Setup condition
Link No. Position Function
LK1 A Software input selected
LK2 A VREF not buffered
LK3 A Connected to EVAL-SDP1Z
LK4 IN V1 input grounded
LK5 IN V2 input grounded
LK6 B
Input range set to ±4 × VREF ( Over ridden by control registers in software )
LK7 A Normal operation selected
LK8 C Connected to EVAL-SDP1Z
LK9 B Word mode selected
LK10 A Connected to EVAL-SDP1Z
LK11 B Connected to EVAL-SDP1Z
LK12 A Connected to EVAL-SDP1Z
LK13 A VREF sourced from AD780
LK14 IN V3 input grounded
LK15 IN V4 input grounded
LK16 A VDRIVE =3.3V from EVAL-SDP1Z supply
LK17 IN V5 input grounded
LK18 IN V6 input grounded
LK19 OUT External VREF disconnected
LK20 B Parallel mode selected
LK21 OUT AD780 VOUT = 2.5V
LK22 OUT
CONVST_A & CONVST_B not linked
LK23 A Connected to EVAL-SDP1Z
LK24 OUT External VREF disconnected
LK25 A Connected to EVAL-SDP1Z

UG-AD7656-1/57-1/58-1 Evaluation Board User
Guide
Rev. PrA | Page 10 of 32
LK26 A Connected to EVAL-SDP1Z
LK27 A Connected to EVAL-SDP1Z
LK28 A Connected to EVAL-SDP1Z
LK29 A Connected to EVAL-SDP1Z
LK30 A Connected to EVAL-SDP1Z
LK31 A Connected to EVAL-SDP1Z
LK32 A Connected to EVAL-SDP1Z
LK33 A Connected to EVAL-SDP1Z
LK34 B Connected to EVAL-SDP1Z
LK35 B Connected to EVAL-SDP1Z
LK36 OUT
CONVST_A CONVST_C not linked
LK1011 A Onboard op amp power used
LK1021 A Onboard op amp power used
LK103
LK104
LK105
LK106
NOPOP
POP
POP
NOPOP
Op amp supply rails set to ±15V
LK701 A Onboard DVCC used
LK702 A Onboard AVCC used
SL1 OUT REFCAPA & REFCAPB not linked
SL2 OUT REFCAPB & REFCAPC not linked
SL3 to
SL14
OUT Not used
SL15 A Input buffered
SL16 A Input buffered
SL17 A Input buffered
SL18 A Input buffered
SL19 A Input buffered
SL20 A Input buffered