August 13, 2007
Rev -1.0
KTD
National Semiconductor
Evaluation Board User's Guide
DAC128S085 12-Bit, DAC108S085 10-Bit, DAC088S085 8-Bit
OCTAL Micro Power Digital-to-Analog Converter
with Daisy Chain Capability
© 2007 National Semiconductor Corporation.
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Table of Contents
1.0 Introduction........................................................................................................................................ 4
2.0 Board Assembly ............................................................................................................................... 5
3.0 Quick Start......................................................................................................................................... 5
3.1 Stand-Alone Mode ....................................................................................................5
3.2 Computer Mode ........................................................................................................5
4.0 Functional Description ..................................................................................................................... 6
4.1 Serial Interface ................................................................................................................... 7
4.2 DAC Reference Circuitry .................................................................................................. 7
4.3 Analog Output..................................................................................................................... 7
4.4 Power Supply Connections .............................................................................................. 7
5.0 Software Operation and Settings................................................................................................... 7
6.0 Evaluation Board Specifications .................................................................................................... 7
7.0 Hardware Schematic..............................................................................................................8
8.0 Board Layouts ........................................................................................................................9
9.0 Evaluation Board Bill of Materials .................................................................................................. 10
A1.0 Summary Tables of Test Points, Jumpers, and Connectors .................................................. 11
A2.0 Enlarged Timing Diagram............................................................................................................. 12
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1.0 Introduction
and the latest version can be downloaded from the web
at http://www.national.com/adc.
The DAC128S085EB Design Kit (consisting of the
DAC128S085 Evaluation Board and this User's Guide)
is designed to ease evaluation and design-in of the
National
Semiconductor
DAC128S085
12-Bit,
DAC108S085 10-Bit, and DAC088S085 8-Bit OCTAL
Micro Power Digital-to-Analog Converter with Daisy
Chain Capability. This family of pin-compatible DACs
will be referenced throughout this document as the
DAC128S085.
Note: WaveVision Software version 4.4 or later is
required to evaluate this part with the WV4 Evaluation
System.
The WaveVision software allows the user to drive the
DAC128S085 with a variety of preset and custom
waveforms. The software also allows the user to select
the clock frequency of the serial interface.
The evaluation board can be used in either of two
modes. In the Stand-Alone mode suitable test
equipment, such as a pattern generator and signal
analyzer, can be used with the board to evaluate the
DAC128S085 performance.
Data transmitted to the DAC128S085 via a serial
interface is converted to an analog waveform by U2/U3,
the DAC128S085. The board supports two different
packages, LLP (U2) and TSSOP (U3), and these
packages can either be driven simultaneously or
individually.
In the Computer mode, data capture and evaluation are
simplified by connecting this board to National
Semiconductor’s Data Capture Board (order number
WAVEVSN BRD 4.1 or higher). The Data Capture
(referenced throughtout this document as the WV4)
Board is connected to a personal computer running
WaveVision software through a USB port. The
WaveVision 4 software runs on Microsoft Windows,
Note: The eval board contains two packages with
separate headers for outputs, loads, power, ect. For the
remainder of this document, the headers for the
different packages are separated by a forward slash,
with the first value being for the LLP and the second
value
being
for
the
TSSOP
(LLP/TSSOP).
J3 WV4S
Connector
J4 WV4
Serial Interface
U3
DAC128S085
JP15
VOUT (A-D)
JP9
VOUT (E-H)
JP7
VOUT (A-D)
U2
DAC128S085
JP1
VOUT (E-H)
JP16
Output Load
JP14
I_VA
JP6
I_VA
JP13
VA Selection
JP11/JP8
Output Load
JP10
I_VREF2
J5
VA_REM & VREF_REM
JP2
Output Load
JP5
VA Selection
JP12
I_VREF1
JP3
I_VREF2
JP4
I_VREF1
J2
VA_REM & VREF_REM
Figure 1: Locations of Test Points and Major Components
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6.
2.0 Board Assembly
The DAC128S085 evaluation board comes fully
assembled and ready for use with the WV4 (or higher)
system. Refer to the Bill of Materials for a description of
components, to Figure 1 for major component
placement, and to Figure 7 for the Evaluation Board
schematic.
Connect your Logic Generator to the Serial
Interface header J4 (not currently populated).
Refer to Figure 3 below for connection details.
3.0 Quick Start
The DAC128S085 evaluation board may be used in the
Stand-Alone mode or Computer mode. In Stand-Alone
mode, a Pattern Generator is used to drive the
DAC128S085, and a Signal Analyzer is used to
evaluate the analog output signal. In Computer Mode,
a WV4 board is used to drive the DAC128S085 and a
Signal Analyzer is used to evaluate the analog output
signal.
Figure 3: J4 (WV4) Serial Interface Header
3.1 Stand-Alone Mode
Refer to Figure 1 or the evaluation board schematic
(Figure 7) for locations of test points and major
components.
7.
1.
Connect a clean analog (not switching) +5V power
source with a 500mA current limit to pin 3 of header
J2/J5 on the DAC128S085 board, ground pin 2 and
turn on the power. Place a jumper across pins 2 &
3 of header JP5/JP13 to select VA_REM (VA
Remote).
8.
2.
Place a jumper across pins 1 & 2 of JP6/JP14 to
power the VA of the DAC128S085.
The default setup is to use the VA_REM to power
both VA and VREF. To do this, place jumpers in the
following locations (see table 1 for details):
3.
4.
5.
The Analog Output signals of each channel can be
seen DC coupled at header JP1/JP15 for outputs
A-D and header JP7/JP9 for outputs E-H.
Select the desired output load by adding jumpers to
headers JP8/JP16 for outputs A-D and JP2/JP11
for outputs E-H. See Figure 4 for the configuration
of header JP8. Refer to table 1 in Section 4.0 or
the evaluation board schematic (Figure 7) for all
configurations.
• JP4/JP12 – pins 1 & 2 and pins 3 & 4
• JP3/JP10 – pins 1 & 2 and pins 3 & 4
To use separate supplies for VA and VREF, connect
a clean analog (not switching) +5V power source
with a 500mA current limit to pin 1 of header J2/J5
and turn on the power. Place jumpers in the
following locations (see table 1 for details):
• JP4/JP12 – pins 1 & 2
• JP3/JP10 – pins 1 & 2 and pins 3 & 4
Create the digital waveforms seen in Figure 2 with
your Logic Generator. Ensure that SCLK does not
exceed 40MHz. Refer to the DAC128S085
Datasheet for further details.
Figure 4: JP8 Load Select Header
3.2 Computer Mode
Refer to Figure 1 for locations of test points and major
components.
1.
2.
Run the WaveVision 4 program. While the program
is loading continue below.
Connect the J3 header on the DAC128S085
Evaluation board to the J7 serial connector on the
WV4 board. The Evaluation board can either be
powered by an external supply (recommended)
through J2/J5 or by the +5.0V and +3.3V supply
from the WaveVision. Refer to Figure 5 for the
serial connection and Figure 6 for specific pin
connection details.
Figure 2: Digital Input Timing Diagram
(Refer to Appendix 2.0 for an enlarged version)
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4.0 Functional Description
Table 1 describes the function of the various jumpers on
the DAC128S085 evaluation board. The Evaluation
Board schematic is shown in Figure 7.
Pins 1 & 2
Pins 2 & 3
JP5/
JP13
Select VA=5V from
WV4.1 Board
Select VA_REM
from J2/J5
JP6/
JP14
Power VA on
DAC128S085
NA
Pins 1 & 2
Pins 3 & 4
JP3/
JP10
Power VREF2 on
DAC128S085
Power VREF2 on
DAC128S085
JP4/
JP14
Power VREF1 on
DAC128S085
Uses one supply
voltage for VA and
VREF, separate
supplies if removed
JP8/
JP16
JP2/
JP11
Select 200pF
Output Load
Capacitance
VOUT_A
Select 200pF
Output Load
Capacitance
VOUT_E
Select 2kΩ Output
Load Resistance
VOUT_A
Select 2kΩ Output
Load Resistance
VOUT_E
Select 200pF
Output Load
Capacitance
VOUT_B
Select 200pF
Output Load
Capacitance
VOUT_F
Select 2kΩ Output
Load Resistance
VOUT_B
Select 2kΩ Output
Load Resistance
VOUT_F
Select 200pF
Output Load
Capacitance
VOUT_C
Select 200pF
Output Load
Capacitance
VOUT_G
Select 2kΩ Output
Load Resistance
VOUT_C
Select 2kΩ Output
Load Resistance
VOUT_G
Select 200pF
Output Load
Capacitance
VOUT_D
Select 200pF
Output Load
Capacitance
VOUT_H
Select 2kΩ Output
Load Resistance
VOUT_D
Select 2kΩ Output
Load Resistance
VOUT_H
Jumper
Figure 5: WV4 to DAC128S085 Connection
Jumper
Pin
1&2
Figure 6: J3 (WV4S) Header Connection
3.
4.
5.
6
7.
8.
Connect a USB cable between the WV4 board and
the PC running the WaveVision 4 software.
Connect a clean analog (not switching) +5V and
500mA current limit power source to Power
Connector J1 on the WV4 board, ground the GND
connector and turn on the power.
3&4
5&6
Place a jumper across pins 2 & 3 of JP5/JP13 on
the DAC128S085 board to select VA_REM.
VA and VREF can be supplied either together or
separately. The default selection is for VA and VREF
to be supplied from a single source. To accomplish
this, place jumpers in the following locations (see
table 1 for further details):
7&8
9 & 10
• JP6/JP14 - pins 1 & 2
• JP3/JP10 - pins 1 & 2 and pins 3 & 4
• JP4/JP12 - pins 1 & 2 and pins 3 & 4
Note: For separate supplies, remove the jumper
across pins 3 & 4 of header JP4/JP12.
Perform steps 7 and 8 of section 3.1 above.
Refer to section 5.0, “Software Operation and
Settings.”
11 & 12
13 & 14
15 & 16
Table 1: Jumper Configurations
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4.1 Serial Interface
5.0 Software Operation and Settings
In Computer Mode, the serial interface is driven by the
WV4 board. The WaveVision 4 software allows the
user to drive the DAC128S085 with various digitized
signals. Refer to “Software Operation and Settings” for
further information.
The WaveVision software is included with the WV4
board and the latest version can be downloaded from
National's web site at http://www.national.com/adc.
WaveVision software version 4.4 or later is required to
evaluate this device with the WV4 system.
In Stand-Alone Mode, the serial interface must be
driven by an external device. The three-wire interface
(SCLK, SYNC, DIN) is compatible with SPI, QSPI and
MICROWIRE, as well as most DSPs. See the Timing
Diagram (Figure 2) for information on a write sequence.
To install this software, follow the procedure in the
WAVEVSN BRD 4.1 User's Guide. Once the software
is installed, run it and set it up as follows:
Note: Before continuing, ensure that the WaveVision
Hardware is setup according to Section 3.2.
The maximum digital input level of the three-wire
interface is independent of the analog supply voltage
(VA). The range of all digital inputs is 0V to 5.25V
regardless of VA.
A write sequence begins by bringing the SYNC line low.
Once SYNC is low, the Binary data on the DIN line is
clocked into the 16-bit serial input register on the falling
edges of SCLK. After the 16th falling clock edge, the
SYNC is brought high and the programmed function (a
change in the mode of operation and/or a change in the
DAC register contents) is executed. For a new write
sequence to be executed, SYNC must be brought high
for the minimum specified time.
1.
From the WaveVision main menu, go to Settings,
then Capture Settings to open the System Settings
window.
2.
Under board type, select WaveVision 4 (USB).
3.
Turn on the power to both boards, then click on the
"Test" button and await the firmware download.
After the firmware has downloaded, WaveVision
will open up a control panel for the DAC128S085.
4.
Click on the "Accept" button to close the System
Settings Dialog.
5.
From the DAC128S085 Control Panel, configure
the digital waveform to be converted by the DAC.
Please see the WV4 User’s Manual for detailed
instructions. The ability to drive preset waveforms
or custom data is provided.
6.
Press the “Start” button to begin driving the digital
waveform to the DAC.
Since the DIN buffer draws more current when it is high,
it should idle low between write sequences to minimize
power consumption.
Please refer to the DAC128S085 datasheet for more
information.
4.2 DAC Reference Circuitry
The WV4 Board will continuously send the waveform
out to the DAC128S085 until the “Stop” button is
pressed. Please refer to Section 4.3 for details on
measuring the Analog Output of the DAC.
The reference voltage for the DAC128S085 is selected
by JP3/JP10 and JP4/JP14, see table 1 for further
details. The reference can either be supplied separatly
or using the supply voltage VA. In both cases, the range
of VREF is +0.5V to +5.5V. The analog output range of
the DAC128S085 can be set anywhere from 0V to VREF.
The Digital Waveform is plotted in the main WaveVision
window for added convenience. See the WV4 Board
User's Guide for details.
The analog output of this evaluation board is available
DC coupled at the header JP7/JP15 and JP1/JP9. For
loaded outputs refer to Figure 4 and table 1.
If this board is used in conjunction with the WAVEVSN
BRD 4.1 Data Capture Board and WaveVision software,
a USB cable is needed to connect WAVEVSN BRD 4.1
to the host computer. See the WV4 Board User's Guide
for details.
4.4 Power Supply Connections
6.0 Evaluation Board Specifications
4.3 Analog Output
In Computer mode, the board can be powered by either
an external supply or the local WV4 board supply. In
Stand-alone mode, the DAC128S085 board must be
powered by an external supply.
Board Size:
If you wish to supply VA externally, connect a DC
voltage supply to connector J2/J5 and place a jumper
across pins 2 & 3 of JP5/JP13 to select VA_REM. The
supply voltage (VA) can be set anywhere from 0V to
VREF.
4.85" x 3.55" (12.3 cm x 9 cm)
Power Requirements
Min: +2.7V , 3 mA Max: +5.5V, 5 mA
Max Clock Frequency:
40 MHz
Analog Output
DC Coupled
Impedance:
User Selectable: 2KΩ, 200pF, or ∞
If the supply voltage (VA) serves as the reference for the
DAC128S085, ensure a clean power supply is used.
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7.0 Hardware Schematic
Figure 7: DAC128S085 Evaluation Board Schematic
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8.0 Board Layouts
Figure 8: DAC128S085 Evaluation Board Top Layer with Silk Screen
Figure 9: DAC128S085 Evaluation Board Top Layer (left) and Bottom Layer (right)
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9.0 Evaluation Board Bill of Materials
Qty.
Reference
Rating
Value
sm/c_0603
10V
0.1uF
C2
sm/c_1206
10V
NS
16
C3,C5,C6,C7,C13,C14,
C15,C16,C17,C19,C20,
C22,C27,C28,C29,C30
sm/c_0603
10V
200pF
6
C4,C10,C12,C21,C24,
C26
sm/c_1206
10V
1uF
3
D1,D2,D3
sm/led_21
Digikey
516-1440-1-ND
4
JP1,JP7,JP9,JP15
blkcon.100/vh/tm1sq/w.100/4
Digikey
S1011E-36-ND
VOUT
4
JP2,JP8,JP11,JP16
BLKCON.100/VH/TM2OE/W.200/16/STD
Digikey
S2041E-30-ND
HEADER 8X2
2
JP3,JP10
blkcon.100/vh/tm1sq/w.100/4
Digikey
S1011E-36-ND
I_VREF2
2
JP4,JP12
blkcon.100/vh/tm1sq/w.100/4
Digikey
S1011E-36-ND
I_VREF1
2
JP5,JP13
blkcon.100/vh/tm1sq/w.100/3
Digikey
S1011E-36-ND
VA SELECTION
2
JP6,JP14
blkcon.100/vh/tm1sq/w.100/2
Digikey
S1011E-36-ND
I_VA
2
J1,J6
NS
SMA-5
C1,C8,C9,C11,C18,
C23,C25
1
7
PCB Footprint
Source
rf/sma/v_clr
Source Part #
RED LED
2
J2,J5
term_block/.300/3pos
Digikey
ED1609-ND
TERM
1
J3
blkcon/2mm/ra/tm2oe/w2mm/14
Digikey
S5803-21-ND
WV4S
1
J4
blkcon.100/vh/tm2oe/w.200/14
Digikey
S2041E-30-ND
WV4
2
L1,L2
sm/l_1206
Digikey
445-1543-1-ND
100uH
1
R1
sm/r_0603
200
16
R2,R3,R4,R5,R11,R12,
R13,R14,R15,R16,R17,
R18,R20,R21,R22,R23
sm/r_0603
2K
5
R6,R8,R9,R10,R24
sm/r_1206
51
2
R7,R19
sm/r_0805
200
6
TP1,TP2,TP4,TP6,
TP7,TP9
1
TP3
TP_500X/50/W_CASE
2
TP5,TP8
TP_500X/50/W_CASE
TP_500X/50/W_CASE
Digikey
S1011E-36-ND
AGND
Digikey
S1011E-36-ND
3P3V
Digikey
S1011E-36-ND
VA1
1
U1
sog.050/8/wg.244/l.200
24C02
1
U2
SOCKET_LLP.50M/16/WG4.00/EXP_PAD
DAC128S085CIMT
1
U3
SOCKET_SOG.65M/16/WG6.40/L5.00
DAC128S085CIMT
2
VIA1,VIA4
tp_37/60
Digikey
NS
DIN_CON
1
VIA2
tp_37/60
Digikey
NS
DOUT1
1
VIA3
tp_37/60
Digikey
NS
DOUT2
1
VIA5
tp_37/60
Digikey
NS
DIN1
1
VIA6
tp_37/60
Digikey
NS
DIN2
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APPENDIX
A1.0 Summary Tables of Test Points, Jumpers, and Connectors
Test Points on the DAC128S085 Evaluation Board
TP1: AGND
Ground. Located at the upper right of the board.
TP2: AGND
Ground. Located at the upper middle of the board.
TP3: 3P3V
3.3V test point. Located at the lower left of the board.
TP4: AGND
Ground. Located at the lower left of the board.
TP5: VA
VA Test Point. Located in the upper left of the board.
TP6: AGND
Ground. Located at the lower right of the board.
TP7: AGND
Ground. Located at the middle of the board.
TP8: VA
VA Test Point. Located in the upper right of the board.
TP9: AGND
Ground. Located in the upper right of the board.
Connectors on the DAC128S085 Evaluation Board
J1: SMA Footprint
Not Used
J2: Terminal Block
VA_REM and VREF_REM. External power supply connector for DAC U2.
J3: WV4.1 Connector
WaveVision 4.1 connector. (Refer to Figure 6 for a pin-out diagram.)
J4: Serial Interface
Serial Interface connector. (Refer to Figure 3 for a pin-out diagram.)
J5: Terminal Block
VA_REM and VREF_REM. External power supply connector for DAC U3.
J6: SMA Footprint
Not Used
Selection Jumpers on the DAC128S085 Evaluation Board (Refer to table 1 in Section 4.0 for configuration details)
JP1: Output Header
DC Coupled output for channels E-H for U2.
JP2: LOAD SELECT
Configures the output load for channels E-H for U2.
JP3: I_VREF2
Powers VREF2 and used to measure current going to VREF2.
JP4: I_VREF1
Powers VREF1, measure current going to VREF1, and selection for separate supplies for VREF and VA.
JP5: VA SELECTION
Selects source of VA.
JP6: I_VA
Powers VA and used to measure current going to VA.
JP7: Output Header
DC Coupled output for channels A-D for U2.
JP8: LOAD SELECT
Configures the output load for channels A-D for U2.
JP9: Output Header
DC Coupled output for channels E-H for U3.
JP10: I_VREF2
Powers VREF2 and used to measure current going to VREF2.
JP11: LOAD SELECT
Configures the output load for channels E-H for U3.
JP12: I_VREF1
Powers VREF1, measure current going to VREF1, and selection for separate supplies for VREF and VA.
JP13: VA SELECTION
Selects source of VA.
JP14: I_VA
Powers VA and used to measure current going to VA.
JP15: Output Header
DC Coupled output for channels A-D for U3.
JP16: LOAD SELECT
Configures the output load for channels A-D for U3.
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A2.0 Enlarged Timing Diagram
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BY USING THIS PRODUCT, YOU ARE AGREEING TO BE BOUND BY THE TERMS AND CONDITIONS OF NATIONAL
SEMICONDUCTOR'S END USER LICENSE AGREEMENT. DO NOT USE THIS PRODUCT UNTIL YOU HAVE READ AND
AGREED TO THE TERMS AND CONDITIONS OF THAT AGREEMENT. IF YOU DO NOT AGREE WITH THEM, CONTACT THE
VENDOR WITHIN TEN (10) DAYS OF RECEIPT FOR INSTRUCTIONS ON RETURN OF THE UNUSED PRODUCT FOR A
REFUND OF THE PURCHASE PRICE PAID, IF ANY.
The DAC124S085 Evaluation Board is intended for product evaluation purposes only and is not intended for resale to end
consumers, is not authorized for such use and is not designed for compliance with European EMC Directive 89/336/EEC, or for
compliance with any other electromagnetic compatibility requirements.
National Semiconductor Corporation does not assume any responsibility for use of any circuitry or software supplied or described.
No circuit patent licenses are implied.
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Following are URLs where you can obtain information on other Texas Instruments products and application solutions:
Products
Applications
Audio
www.ti.com/audio
Automotive and Transportation www.ti.com/automotive
Amplifiers
amplifier.ti.com
Communications and Telecom www.ti.com/communications
Data Converters
dataconverter.ti.com
Computers and Peripherals
www.ti.com/computers
DLP® Products
www.dlp.com
Consumer Electronics
www.ti.com/consumer-apps
DSP
dsp.ti.com
Energy and Lighting
www.ti.com/energy
Clocks and Timers
www.ti.com/clocks
Industrial
www.ti.com/industrial
Interface
interface.ti.com
Medical
www.ti.com/medical
Logic
logic.ti.com
Security
www.ti.com/security
Power Mgmt
power.ti.com
Space, Avionics and Defense
www.ti.com/space-avionics-defense
Microcontrollers
microcontroller.ti.com
Video and Imaging
www.ti.com/video
RFID
www.ti-rfid.com
OMAP Mobile Processors
www.ti.com/omap
Wireless Connectivity
www.ti.com/wirelessconnectivity
TI E2E Community Home Page
e2e.ti.com
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