National Semiconductor DAC121C085, DAC101C081, DAC101C085, DAC121C081, DAC081C081 User Manual

Dec. 19, 2007

National Semiconductor

Rev - 1.0

CMC

Evaluation Board User's Guide

DAC121C08XEB, DAC101C08XEB, DAC081C08XEB

Micro Power Digital-to-Analog Converter (DAC)

with an I2C-Compatible Interface

12-bit 10-bit 8-bit

DAC121C085/

DAC121C081

DAC101C085/

DAC101C081

DAC081C085/

DAC081C081

1 http://www.national.com

Table of Contents

1.0 Introduction ........................................................................................................... 3

2.0 Board Assembly.................................................................................................... 4

3.0 Quick Start............................................................................................................ 4

3.1 Stand-Alone Mode..................................................................................... 4

3.2 Computer Mode......................................................................................... 5

4.0 Functional Description........................................................................................... 6

4.1 Jumper Settings ........................................................................................ 6

2

4.2 I

C Interface .............................................................................................. 6

4.3 DAC Reference Circuitry ........................................................................... 6

4.4 Analog Output ........................................................................................... 7

4.5 Power Supply Connections........................................................................ 7

5.0 Software Operation and Settings .......................................................................... 8

6.0 Evaluation Board Specifications............................................................................ 9

7.0 Hardware Schematic............................................................................................. 10

8.0 Evaluation Board Bill of Materials.......................................................................... 11

A1.0 Summary Tables of Test Points, Jumpers, and Connectors ............................... 12

2 http://www.national.com

1.0 Introduction

A

A

The DAC121C08XEB Design Kit (consisting of the
DAC Evaluation Board and this User's Guide) is
designed to ease evaluation and
design-in of National Semiconductor’s
DAC121C081/DAC121C085 family of Digital-to­Analog Converters (DACs). The Micro-Power
DACs feature Rail-to-Rail Output and an I
Compatible interface. This User’s Guide supports
all three resolutions of the DAC family. The
evaluation board comes with the full-featured
MSOP-8 version of the DAC. For the 12-bit
resolution, the DAC121C085 is used. For the 10­bit resolution, the DAC101C085 is used. For the
8-bit resolution, the DAC081C085 is used. All the
devices in the family (DAC121C085,
DAC101C085, and DAC081C085) will be referred
to as the DAC121C085 in this document.

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 DAC121C085 performance.

2

C-

In the Computer mode, data capture and
evaluation is simplified by connecting this board to
National Semiconductor’s Data Capture Board
(order number W AVEVSN BRD 4.4). The Data
Capture (WV4) Board is connected to a personal
computer running WaveVision software through a
USB port. The WaveVision4 software runs on
Microsoft Windows, and the latest version can be
downloaded from the web at

http://www.national.com/adc

.

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 DAC121C085 with a variety of preset
waveforms and custom waveforms. The software
also allows the user to configure the I

2

C serial

Interface.

Data transmitted to the DAC121C085, via the

2

C interface, is converted to an analog waveform

I
by U1, the DAC121C085.

JP10

3P3V Select

J1

WV4S

Connector

J3

WV4 Connector

JP5

dd Select

U1

DAC121C085

JP4

Output Load

J4

V

OUT

JP7

V

Select

REF

J2

V

Input

A

JP9

V

Select

3 http://www.national.com

Figure 1: Component and Test Point Locations

2.0 Board Assembly

A

The DAC121C08XEB 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
Figure 12 for the Evaluation Board schematic.

3.0 Quick Start

The evaluation board may be used in the Stand­Alone mode or Computer mode. In Stand-Alone
mode, a Pattern Generator is used to interface to
the DAC’s I
WaveVision4 Board is used to drive the DAC’s I
interface. In either case, a Signal Analyzer is used
to evaluate the analog output signal.

3.1 Stand-Alone Mode

Refer to Figure 1 for locations of test points and
major components.

1. Connect a clean analog (not switching) +5V
power source to Power Connector J2 on the
DAC121C08XEB board. Ground the middle
terminal and connect +5V to the bottom
terminal closest to JP9.

2. Make the following required jumper
connections, see Table 1 for more details:

3. Turn on the power source.

4. Configure a pattern generator or other I
master device to interface to the
DAC121C085. Refer to the timing diagrams
in the datasheet for further timing details. The
DAC supports any of the three standard I
speed ranges. Ensure the I
is configured to drive 5V CMOS logic.

5. Connect the I
Interface Header J3 (WV4). Refer to Figure 2
below for connection details. NOTE: The
board comes with pull-up resistors (R6 and
R7). Any other pull-ups on the I
be disabled.

2

C Interface. In Computer Mode, a

• JP9 - pins 2 & 3

• JP7 - pins 2 & 3

• JP6 - pins 1 & 2

• JP8 - pins 1 & 2

2

C master device to Serial

2

C master device

2

C bus must

2

C

2

C

2

C

14

13

12

11

10

9

8

7

5

6

SCL

SD

Figure 2: J3 (WV4) Interface Header

4 2 3

J3
WV4

1

6. The Analog Output signal can be seen DC
coupled at J5, or AC coupled at SMA
connector J4. See the board schematic of
Figure 12 for details.

7. Select the desired output load by adding
jumpers to JP4. Connect a jumper across the
two left pins near the “C” to add a 200pF load
capacitance to ground. Connect a jumper
across the two right side pins near the “R” to
add a 2kΩ resistive load. See Table 1 for
jumper configurations.

2

8. The DAC121C085 will respond to I
0x0C by default with pins A0 and A1 floating.
Change the I

2

C slave address of the DAC by

C address

adding jumpers to JP5. A0 is controlled by
pins 1,2, & 3 of JP5. A1 is controlled by pins
5, 6, & 7. Refer to Table 1 for a detailed
description of the I

2

C Slave address settings.
NOTE: Jumper Setting changes to the pin­configurable slave address will not take effect
until the DAC is power-cycled.

4 http://www.national.com

3.2 Computer Mode

(

)

N

(

)

N

(

)

Refer to Figure 1 for locations of test points and
major components. The board comes configured
for “plug-and-play” WaveVision evaluation.

1. Run the W aveVision 4 program, version 4.4 or
higher is required to interface to the WV4
board. While the program is loading, continue
below.

2. Connect a USB cable between the WV4 board
and the PC running the WaveVision 4
software.

3. Make the following required jumper
connections, see Table 1 for more details:

• JP9 - pins 1 & 2

• JP7 - pins 2 & 3

• JP6 - pins 1 & 2

• JP8 - pins 1 & 2

• JP10 - pins 1 & 2

4. Connect the J1 header on the
DAC121C08XEB evaluation board to the WV4
serial connector (J7) on the WV4 board.
Refer to Figure 3 for the serial connection and

Figure 4 for the J1 header pin out.
Note: J1 on the DAC121C08XEB is

intentionally stuffed on the bottom side of the
board.

+3.3V

SDA

EEPROM

13

11

14

12

+5V

SCL

(EEPROM)

/C

9

10

/C

7

8

GND

SCL

DAC

5

6

GND

3

4

SDA

DAC

1

2

J1
WV4S

Figure 4: J1 (WV4S) Header

5. Perform step 7 of section 3.1 to configure the
loading of the analog output (V

6. Perform step 8 of section 3.1 to configure the

2

C slave address of the DAC.

I

OUT

).

7. Connect a clean (not switching) +5.0V power
source with a 350mA current limit to power
connector J1 on the WV4 board. Turn on the
power supply.

8. Refer to Section 5.0 on Software Operation
and Settings to setup the WaveVision 4
software.

Figure 3: WV4 to DAC121C08XEB Connection

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4.0 Functional Description

4.1 Jumper Settings

Table 1 describes the function of the various
jumpers on the DAC121C08XEB evaluation
board. The evaluation board schematic is shown
in Figure 12.

Jumper

JP4

JP5

JP6 Enable V

JP7

JP8 Enable VA supply to the DAC.

JP9

JP10

Jumper JP4 (V

Left side

pins near

“C”

Pins 1 & 2 Pins 2 & 3

Load Select (See Below)

V

OUT

2

C Address Select (See Below)

I

supply to the DAC.

REF

Use external

V

from J2.

REF

Use VA from the

WV4 board

Use 3.3V supply

from the WV4

board

Set V

Use external VA

Use external

3.3V supply from

Load Select)

OUT

= VA

REF

from J2.

TP6.

Connect a 200pF load capacitance

from V

to GND

OUT

4.2 I2C Interface

The DAC supports all three I

2

C speeds, including
Hs-Mode (3.4MHz). In Hs-Mode the maximum
DAC conversion rate is 188.9kHz. The board is
designed with 1kΩ I

2

C pull-up resistors on both
the SDA and SCL lines (R6 & R7). Also, series
resistors for SCL and SDA are designed into the
board (R8 & R9). The board is shipped with 51Ω
series resistors which can be increased to
interface to a noisy I

In Computer Mode, the I

2

C bus.

2

C interface is driven by
the WaveVision4 board. The WaveVision4
software allows the user to drive the DAC121C085
with various digitized signals. Refer to Section 5.0
“Software Operation and Settings” for further
information.

2

In Stand-Alone Mode, the I

C interface must be
driven by an external device. See section 1.4.5 of
the DAC121C081/DAC121C085 datasheet for a
typical write sequence timing diagram.

2

The maximum digital input level of the I

C

interface depends on the analog supply voltage

). The interface operates at normal CMOS

(V

A

logic levels. See the Electrical Characteristics
section of the datasheet for further details.

The SDA signal is accessible by connecting to
pin 2 of the WV4 connector (J3). The SCL signal
is accessible by connecting to pin 6 of J3.

Please refer to section 1.4 of the datasheet for a
detailed description of the I

2

C interface. Refer to

the Philips I2C Specification for further details.

Right side

pins near

“R”

Connect a 2kΩ load resistance from

V

to GND

OUT

4.3 DAC Reference Circuitry

The reference voltage for the DAC121C085 is
selected by JP7. (See Table 1 for details.) The

Jumper JP5 (I

2

C Address Select)

Address

0x0C No jumpers

0x0D Short pins 2 & 3.

0x0E Short pins 1 & 2.

0x08 Short pins 6 & 7.

0x09 Short pins 2 & 3 and pins 6 & 7.

0x0A Short pins 1 & 2 and pins 6 & 7.

0x4C Short pins 5 & 6.

0x4D Short pins 2 & 3 and pins 5 & 6.

0x4E Short pins 1 & 2 and pins 5 & 6.

Table 1: Jumper Configurations

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reference can either be selected as the V
or an externally supplied voltage (J2). The analog
output range of the DAC121C085 can be scaled
by adjusting the reference voltage (V
lower the V

, the smaller the output range. V

REF

REF

can be set anywhere from 1.0V to V
independent of V
from +2.7V to +5.5V. In any case, V

and can be set anywhere

REF

has little

REF

to no PSRR and must be as clean as possible to
reduce noise feedthrough on V

OUT

.

supply

A

). The

REF

. VA is

A

4.4 Analog Output

A

A

R

The analog output of this Eval board is available in
two places. For a DC coupled output, pin 1 of J5
provides V

and pin 2 provides AGND. An AC

OUT

coupled output is provided by the SMA connector
(J4). See Figure 5 below for details.

If using a spectrum analyzer to look at the output
of the DAC, the AC coupled output (J4) is
recommended.

For very low frequency (i.e. less than 1kHz), use
J5 to see the output signal DC coupled. For an
AC coupled output at low frequencies, simply
replace the AC coupling capacitor at C9 with a
larger capacitor. Use the J4 SMA to look at the
AC coupled output.

AC Coupled

V

If you wish to supply V

externally, connect a DC

A

voltage supply to connector J2. Connect GND to
the center terminal and V

to the bottom terminal.

A

Place a jumper across pins 2 and 3 of JP9 to
select V

_REMOTE. This voltage (VA) can be set

A

anywhere from +2.7V to +5.5V. The source of

is controlled by the JP7 jumper. To set

V

REF

V
V

, short pins 2 & 3. To use an external

REF=VA

from the top terminal of J2, short pins 1 & 2.

REF

Refer to Figure 6 for a diagram of the power
supply connections.

V

REF

V

OUT

Figure 5: Analog Output

4.5 Power Supply Connections

In Computer mode, the board can be powered by
either an external supply or the local WaveVision4
board supply. In Stand-alone mode, the
Evaluation Board must be powered by an external
supply.

If you wish to use the local supply from the
WaveVision4 Board, place a jumper across pins 1

and 2 of JP9. This connection will supply +5V to

on the DAC board. To set V

V

A

REF=VA

, simply
short pins 2 & 3 of JP7. For WaveVision to
recognize the board, the 3P3V supply must be
enabled as well. Do this by placing a jumper
across pins 1 and 2 of JP10. The board comes
configured to use the local supply. The default
jumper settings are shown in Figure 1.

Figure 6: Power Supply Connections

Typical supply currents when applying an external
supply to V

• For V

• For V

and V

A

are as follows:

REF

= +3.3V, I = 7mA

A

= +5.0V, I = 12mA

A

Note: These values are specified for a
continuously operating DAC in High Speed Mode,
driving a full-scale sinewave output. The majority
of this current is for powering devices external to
the DAC121C085 such as the pull-up resistors
and the LED.

GND

V

emote

7 http://www.national.com

5.0 Software Operation and Settings

The WaveVision4 software is included with the
WaveVision4 board and the latest version can be
downloaded from National's web site at
http://www.national.com/adc
software version 4.4 or later is required to evaluate
this device with the WV4 system.

To install this software, follow the procedure in the
WaveVision4 Board 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.

1. From the WaveVision main menu, go to

Settings, then Capture Settings to open the
System Settings dialog.

2. Under board type, select WaveVision4 (USB).

3. Turn on the power to both boards, then click

on the "Reset" button and await the firmware
download. After the firmware has

downloaded, WaveVision will open up a
control panel window for the DAC121C08XEB.

4. Click on the "Close" button to close the

System Settings Dialog.

. WaveVision4

7. Configure the I
DAC121C085 will respond to I
0x0C by default with pins A0 and A1 floating
(no jumpers on JP5). Change the I

2

C address of the DAC. The

2

C address

2

C slave
address of the DAC by adding jumpers to JP5.
Refer to Table 1 for a detailed description of

2

C address settings. The address in

the I
Figure 8 must match the address configured
by A0 and A1.
NOTE: Jumper Setting changes to the pin­configured slave address will not take effect
until the DAC is power-cycled.

Figure 8: I2C Address

8. Perform register level control of the DAC by
writing 16-bit words to the DAC Data Register.
To write the DAC, simply type a 16-bit hex
value into the “Manual DAC Control” field and
press Enter or click the “Write DAC Register”
button. See Figure 9.

5. Navigate to the DAC121C08XEB Evaluation
Board window.

2

6. Configure the I

C Interface speed as seen in
Figure 7. Standard mode, Fast Mode, and
High Speed mode are supported.

Figure 7: I2C Speed Select

Figure 9: Manual DAC Control

9. To put the DAC into power-down mode, select
a power-down option from the “Power-down
Mode” box and click the “Set Mode” button.

Figure 10: DAC Power-down Control

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10. Configure the digital waveform to be
converted by the DAC as seen in Figure 11.

Please see the WaveVision4 User’s Manual
for detailed instructions. The ability to drive
preset waveforms or custom data is provided.

Figure 11: Waveform Configuration

11. Press the “Start” button to begin driving the
digital waveform to the DAC.

6.0 Evaluation Board Specifications

Board Size: 2.8" x 2.0" (7.2 cm x 5.1 cm)

Power Requirements Min: +2.7V , 6mA Max: +5.5V, 16mA

I2C Interface Speed: 100 kHz, 400kHz, or 3.4 MHz

Analog Output

AC Coupled
Output Range:

Impedance: User Selectable: 2KΩ, 200pF, or ∞.

-(VA/2) to (VA/2)

The WaveVision4 Board will continuously send the
waveform out to the DAC over the I

2

C interface
until the “Stop” button is pressed. Please refer to
Section 4.4 for details on measuring the Analog
Output of the DAC.

The Digital Waveform is plotted in the main
WaveVision window for added convienience. This
waveform may be further analyzed by clicking on
the magnifying glass icon, then clicking and
dragging across a specific area of the plot for
better data inspection. See the WaveVision4
Board User's Guide for details.

If this board is used in conjunction with the
WaveVision4 Data Capture Board and
WaveVision software, a USB cable is needed to
connect WaveVision4 Board to the host computer.
See the WaveVision4 Board User's Guide for
details.

9 http://www.national.com

7.0 Hardware Schematic

VREF

AGND

VA_REMOTE

J2

VIN

123

3

VREF_EXT

JP7

VREF

123

AGND

1

TP1

AGND

JP4

3

1

CR

VOUT

TP2

AGND

1

5
4 3

J4

VOUT

HEADER 4X2_0

AGND

1

VA

JP5

R1

2K

C1

VOUT

AGND

J5

LED

200pF

1
2

C9 1uF

2

VOUT

JP6

4

2

ADDRESS S ELECT

L1 100uH

I_VREF

C10

0.1uF

C3

1uF

C2

0.1uF

8

VOUT

A01A12SCL3SDA

U1

1234567

VAA0AGNDVAA1

2
1

7

VREF

2

VREF=VA

1

5P0V_WV

VA

2
1

JP8

I_VA

C11

0.1uF

C5

1uF

C4

0.1uF

6

5

VA

GND

DAC121C08 5

4

R8 51

AGND

REM

WV

JP9

VA SELECT

VA

VA

1

TP4

VA

AGND VA

1

TP3

AGND

R9 51

U2

NC7SZ126P5X_NL

GND

Y

4

5

3

A

2

VA

OE

VCC

1

VA

D1

R10

510

RED LED

WV4S

2468101214

J1

WV4S

13579

SDA_DUT

Figure 12: DAC121C08XEB Evaluation Board Schematic

10 http://www.national.com

R7

1K

VA

R6

1K

SCLSDA

11

13

SCLHS_E

SCL_DUT

3P3V_WV 5P0V_WV

C6

NS

VA

WV4

13579

J3

WV4

246

SDA_DUT

AGND

1

TP5

AGND

U3

24C02

GND

SDA

5

6

7

1112

1314

8

10

SCLHS_E

SDA SCL

SCL_DUT

3P3V

8

C8

3P3V

C7

3P3V_WV

123

JP10

3P3V

WV

REM

4

A2

SCL

3

A1

WP

2

A0

VCC

1

3P3V 3P3V

0.1uF

1uF

R11

1

TP6

3P3V

3P3V_REMOTE

D2

510

RED LE D

3P3V

AGND

1

TP7

AGND

8.0 Evaluation Board Bill of Materials

Quantity Reference PCB

Footprint

1 C1 rc0603 10V 200pF

6 C2,C4,C6,C8,C10,C11 rc0603 10V 0.1uF

4 C3,C5,C7,C9 c1206 10V 1uF

2 D1,D2 D1206-21 Digikey 516-1440-1-ND RED LED

1 JP4 hdr2x2 HEADER 4X2_0

1 JP5 hdr1x7 Digikey S1011E-36-ND ADDRESS

1 JP6 hdr1x2 Digikey S1011E-36-ND I_VREF

1 JP7 hdr1x3 Digikey S1011E-36-ND VREF

1 JP8 hdr1x2 Digikey S1011E-36-ND I_VA

1 JP9 hdr1x3 Digikey S1011E-36-ND VA SELECT

1 JP10 hdr1x3 Digikey S1011E-36-ND 3P3V

1 J1 hdr2x7_2mm-

rh

1 J2 ED120-3 Digikey ED1609-ND VIN

1 J3 berg2x7p Digikey A26529-40-ND WV4

1 J4 SMA VOUT

1 J5 hdr1x2 Digikey S1011E-36-ND LED

1 L1 1206 Digikey 445-1543-1-ND 100uH

1 R1 rc0603 2K

2 R6,R7 rc0603 1K

2 R10,R11 rc0603 510

2 R8,R9 rc0603 51

5 TP1,TP2,TP3,TP5,TP7 tp_60c40dp Digikey S1011E-36-ND AGND

1 TP4 tp_60c40dp Digikey S1011E-36-ND VA

1 TP6 tp_60c40dp Digikey S1011E-36-ND 3P3V_REMOTE

1 U1 mso8SD-8 DAC121C085

1 U2 sc70-5 NS

1 U3 so8 24C02

Source Source Part # Rating Value

SELECT

Digikey S5803-21-ND W V4S

11 http://www.national.com

APPENDIX

A1.0 Summary Tables of Test Points, Jumpers, and Connectors

Test Points on the DAC121C08XEB Evaluation Board

TP1: AGND Ground. Located at the top center of the board.

TP2: AGND Ground. Located at the top center of the board.

TP3: AGND Ground. Located at the bottom right of the board.

TP4: VA VA Test Point. Located at the bottom right of the board.

TP5: AGND Ground. Located at the top left of the board.

TP6: 3P3V 3.3V test point. Located at the top left of the board.

TP7: AGND Ground. Located at the bottom left of the board.

Connectors on the DAC121C08XEB Evaluation Board

J1: WV4S Header Wave Vision 4 Serial connector. Stuffed on the bottom side of the board intentionally.

J2: Terminal Block VREF, AGND, VA_REMOTE. External power supply connector.

J3: Serial Interface
Header

J4: SMA Connector VOUT_AC. AC Coupled Analog Output.

J5: 2-pin Header VOUT. DC Coupled Analog Output.

Selection Jumpers on the DAC121C08XEB Evaluation Board (Refer to Table 1 in Section 4.0 for configuration details)

JP4: V

Load Select

OUT

JP5: I2C Address
Select

JP6: I_VREF Enables V

JP7: V

Select Selects the V

REF

JP8: I_VA Enables VA supply to the DAC. Also used to measure isolated VA current.

JP9: VA Select Selects the V

JP10: 3P3V Select Selects the 3.3V source for powering the WaveVision EEPROM (U3). Always set to pins 1 and 2 for

Serial Interface header. Logic Input. (Refer to Figure 2 for a pin-out diagram.)

Configures the load on V

Configures the DAC’s I

. Refer to Table 1.

OUT

2

C address. Refer to Table 1. Note: Changes to the pin-configured I2C slave

address do not take effect until the DAC is power-cycled.

supply to the DAC. Also used to measure isolated V

REF

REF

REF

source. V

source. V

is either supplied externally or connected to VA by this jumper.

REF

is either supplied externally or connected to VA by this jumper.

REF

current.

REF

WaveVision operation.

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13 http://www.national.com

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
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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 DAC121C08XEB, DAC101C08XEB, & DAC081C08XEB Evaluation Boards are intended for product evaluation purposes only
and are not intended for resale to end consumers, are not authorized for such use and are 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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National does not assume any responsibility for any circuitry described, no circuit patent licenses are implied and National reserves the right at any time
without notice to change said circuitry and specifications.

14 http://www.national.com

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2. A critical component is any component in a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life
support device or system, or to affect its safety or
effectiveness.

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