National Semiconductor
DAC161S055 User’s Guide
October, 2010
Rev – 1.01
RoHS Compliant
Evaluation Board User's Guide
DAC161S055 16-Bit, Low Glitch, Buffered Voltage-Output
Digital to Analog Converter
2010 National Semiconductor Corporation
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National Semiconductor
DAC161S055 User’s Guide
1. Introduction
The DAC161S055 Evaluation Board Design Kit (consisting of the DAC161S055 Evaluation Board, this User’s
Guide and the optional SPUSI2 board from National Semiconductor) is intended to ease evaluation and
design-in of the National Semiconductor DAC161S055 16-bit Digital to Analog Converter.
The evaluation board can be used in either the ‘Stand-Alone mode’ or the ‘Computer mode’. In the ‘StandAlone mode’, the user can interface to the part using the on board TEST_PORT with external pattern
generators and other suitable test equipment or with a ribbon cable attached to their microprocessor’s
evaluation board.
In the ‘Computer mode’, data can be sent to the DAC161S055 using the SPUSI2 board and the TinyI2CSPI
software. The SPUSI2 board can be purchased, and the TinyI2CSPI software downloaded for free, at
http://www.national.com/analog/webench/sensors/spusi2 . The TinyI2CSPI software operates under Microsoft
Windows and allows the user to send and receive individual SPI transactions. The TinyI2CSPI software
therefore will be useful for applications where you want to set an output value and observe that value.
2010 National Semiconductor Corporation
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DAC161S055 User’s Guide
2. Board Assembly
The DAC161S055 evaluation board comes fully assembled and ready for use. Refer to the Bill of Materials for
a description of components, to Figure 1 for major component placement, and to the schematic at the end of
this document.
Power Supply Banana Jacks
Jumper J1
Output BNC
GPSI14/16 header
DAC161S055
Jumper J2
“TEST_PORT”
Figure 1: Location of major components
2010 National Semiconductor Corporation
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National Semiconductor
VREF_TP,
DAC161S055 User’s Guide
VREF test point and ground. Located above the DAC161S055
GND_VREF
VA_TP, GND_VA
VA external supply and ground. Located between the part and the Vout BNC
Table 1: Test Points on the DAC161S055 Evaluation Board
GPSI16/GPSI14
16 pin dual row right angle male header. Connect 14 pin to SPUSI board. The 16 pin are
for forward compatibility.
TEST_PORT
18 pin dual row male header. Allows access to SPI signals, Vout, and on board control
signals. Allows for grounding of control signals (LDACB, MZB, CLRB) using a jumper.
Table 2: Connectors on the DAC161S055 Evaluation Board
J1
Selects reference source for VREF – either external or on board LM4120-4.1.
J2
Connects Vout to the TEST_PORT.
Table 3: Jumpers
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DAC161S055 User’s Guide
3. Quick Start
The fastest way to start using the DAC161S055 evaluation board is to use it in Computer Mode with the
SPUSI2 board and the TinyI2CSPI software.
3.1 Computer Mode
You will need a power supply for VA and a power supply for VDDIO. If you choose to use an external
reference, you will also need a power supply VREF.
•
•
For using the external VREF from the banana jack, connect pin 1 to pin 2 on jumper J1.
To use the onboard LM4120-4.1 regulator, connect pin 3 to pin 2 on jumper J1
•
Determine if you want to start up at zero or mid scale for the DAC output. If zero, connect pins 5
(gnd) and 6 (MZB) on the TEST_PORT header.
•
Determine if you would like to have the DAC update every time you write data to it (instead of
having to write data and then write an update command). If so, short pins 9 and 10 (gnd and
•
LDACB) on the TEST_PORT header.
Connect the SPUSI2 board to the DAC161S055 evaluation board. Ensure that you line up the
SPUSI2 board with the GPSI14 pins as shown on the board (see Figure 2 ). Note that one set of
•
•
Connect the power (VA and VDDIO, optionally VREF) to the board and turn on the supplies.
Connect the SPUSI2 board to your computer via the USB cable.
pins will not match the header.
Figure 2: DAC161S055 Eval board connected to SPUSI board.
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DAC161S055 User’s Guide
•
Start the TinyI2CSPI software on your computer.
•
Once the program has started, select “Add SPI” to get an SPI interface window.
•
The settings needed to communicate with the DAC161S055 are
o
CS=1
o
CKPOL=0
o
CKPHA=0
o
Bits=24
•
Type the command (in HEX) that you wish to send to the DAC161S055 into the MOSI field.
See Figure 3 for some example commands. Pressing “Execute” will send the command to
the DAC.
•
The MISO field will update once “Execute” is pressed. It will be ’00 0000’ for the first
execution. It will be the last command for each subsequent execution as long as a clear
command has not been sent.
•
The DAC output will be available at the Vout BNC after executing a command that updates
the output.
•
Go to http://www.national.com/analog/webench/sensors/spusi2#tinyi2cspi to download the
TinyI2CSPI personality file for this board.
Figure 3: Example commands in TinyI2CSPI interface
2010 National Semiconductor Corporation
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DAC161S055 User’s Guide
4. Functional Description
4.1 DAC Reference Circuitry
This evaluation board includes two options to source the voltage reference, VREF. The options are selecting
the fixed, on board +4.096V voltage reference (LM4120-4.1) to source VREF or using the external banana jack
to source VREF. To select the +4.1V reference, short pins 2 & 3 of J1. To select the external reference, short
pins 1 & 2 of J1. J1 can be driven by a power supply set between +2.7 V and +5.25 V.
4.2 SPI Interface
The DAC161S055 requires three SPI input pins. It has one output pin. The input pins are Serial Clock
(SCLK), Chip Select Bar (CSB), and data in or Master Out Slave In (MOSI). The user must provide input
signals for SCLK, CSB and MOSI. The user can optionally use the data out or Master In Slave Out (MISO) pin
to use the DAC161S055 in a Daisy Chain configuration as described in the data sheet.
4.2.1
Serial Clock (SCLK, CSB, MISO, MOSI)
These signals are provided by the SPUSI2 board in Computer Mode. In Stand Alone Mode, these signals
must be provided by the user either on the TEST_PORT or the GPSI 14/16 header. The signal levels are TTL
and CMOS compatible. The voltage expected is set by the value of VDDIO that is applied to the board.
4.3 Other I/O
The DAC161S055 requires three other digital I/O pins: LDACB, CLRB and MZB.
4.3.1
Load DAC (LDACB) and Clear (CLRB)
These two signals must be provided by the user. In computer mode, you can set the levels by either leaving
the pin on the TEST_PORT unconnected, in which case it floats high, or by shorting the pin to the ground pin
on the header using a jumper. The signal level for CSB is TTL and CMOS compatible. The voltage expected
is set by the value of VDDIO that is applied to the board.
4.3.2
Mid Scale or Zero Output (MZB)
The MZB pin must be provide by the user. In computer mode, the level can be set by leaving the pin floating
(for a high) or shorting it to ground on the TEST_PORT header using a jumper. The signal level for MISO is
TTL and CMOS compatible. Unlike all the other pins, the voltage expected is set by the value of VA that is
applied to the board so that the output is set when the VA supply comes up.
5. Hardware Schematic
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National Semiconductor
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DAC161S055 User’s Guide
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DAC161S055 User’s Guide
6. DAC161S055 Evaluation Board Bill of Materials
Item
Designator
1
AA1
2
C1, C2, C3
10uF
3
C7, C9
0.01uF
4
C8, C10,
C13
C14, C17
0.1uF
5
Value
0.022uF
6
GND, VA,
VDDIO,
VREF
7
8
GND1,
GND2
GPSI16
9
J1
10
J2
11
L1
12
13
R1, R2, R3
R4
10.0k
0
14
R5
10k
15
R6, R8
49.9k
16
17
R7
RG
27
100
18
TEST_PORT
19
U1
20
U2
21
VOUT
Black
2010 National Semiconductor Corporation
Description
Manufacturer
Printed Circuit Board
TBD
Ceramic, X5R, 10V,
10%
Ceramic, X7R, 50V,
10%
Ceramic, X7R, 16V,
10%
Ceramic, X7R, 16V,
10%
Uninsulated Standard
.175 Female Banana
Jack Panel Mount
Kemet
C0805C106K8PACTU
3
Kemet
C0805C103K5RACTU
2
Kemet
C0603C104K4RACTU
3
Kemet
C0603C223K4RACTU
2
Emerson
Network Power
Connectivity
Solutions
Keystone
Electronics
Molex
108-0740-001
4
5011
2
90122-0768
1
3M
961103-6404-AR
1
3M
961102-6404-AR
1
Murata
NFM41PC204F1H3L
1
Vishay-Dale
Vishay-Dale
CRCW080510K0FKEA
CRCW08050000Z0EA
3
1
Vishay-Dale
CRCW080510K0JNEA
1
Panasonic
ERJ-6ENF4992V
2
Vishay-Dale
Panasonic
CRCW060327R0JNEA
ERJ-6GEYJ101V
1
1
3M
961218-6404-AR
1
National
Semiconductor
DAC161S055
1
National
Semiconductor
LM4120AIM5-4.1
1
Amphenol
Connex
31-5329-72RFX
1
Test Point, TH,
Multipurpose, Black
2x8 CONN HEADER
16POS .100" R/A GOLD
CONN 1X3 HEADER
100mil pitch
CONN 1X2 HEADER
100mil pitch
FILTER LC HIGH FREQ
.2UF 1806
1%, 0.125W
RES, 0 ohm, 5%,
0.125W, 0805
RES, 10k ohm, 5%,
0.125W, 0805
RES, 49.9k ohm, 1%,
0.125W, 0805
5%, 0.1W
RES, 100 ohm, 5%,
0.125W, 0805
2x9 CONN HEADER
18POS .100"
Precision 16-bit, Low
Glitch, Buffered VoltageOutput DAC
Precision Micropower
Low Dropout Voltage
Reference
Connector, TH, 75 Ohm
BNC
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PartNumber
Quantity
1
Rev: 1.01
National Semiconductor
DAC161S055 User’s Guide
Notes
2010 National Semiconductor Corporation
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DAC161S055 User’s Guide
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 DAC161S055 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.
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2010 National Semiconductor Corporation
Page 11 of 11
Rev: 1.01
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