National Semiconductor DAC081C081 User Manual Download Page 1

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http://www.national.com

National

Semiconductor

Dec. 19, 2007

Rev - 1.0

CMC

Evaluation Board User's Guide

DAC121C08XEB, DAC101C08XEB, DAC081C08XEB

Micro Power Digital-to-Analog Converter (DAC)

with an I

C-Compatible Interface

12-bit 10-bit 8-bit

DAC121C085/

DAC121C081

DAC101C085/

DAC101C081

DAC081C085/

DAC081C081

Summary of Contents for DAC081C081

Page 1: ...19 2007 Rev 1 0 CMC Evaluation Board User s Guide DAC121C08XEB DAC101C08XEB DAC081C08XEB Micro Power Digital to Analog Converter DAC with an I2 C Compatible Interface 12 bit 10 bit 8 bit DAC121C085 DAC121C081 DAC101C085 DAC101C081 DAC081C085 DAC081C081 ...

Page 2: ...nctional Description 6 4 1 Jumper Settings 6 4 2 I2 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 ...

Page 3: ...signal analyzer can be used with the board to evaluate the DAC121C085 performance In the Computer mode data capture and evaluation is simplified by connecting this board to National Semiconductor s Data Capture Board order number WAVEVSN 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 W...

Page 4: ...to the timing diagrams in the datasheet for further timing details The DAC supports any of the three standard I 2 C speed ranges Ensure the I 2 C master device is configured to drive 5V CMOS logic 5 Connect the I 2 C master device to Serial 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 2 C bu...

Page 5: ...valuation 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 Figure 3 WV4 to DAC121C08XEB Connection Figure 4 J1 WV4S Header 5 Perform step 7 of section 3 1 to configure the loading of the analog output VOUT 6 Perform step 8 of s...

Page 6: ...s which can be increased to interface to a noisy I 2 C bus In Computer Mode the I 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 In Stand Alone Mode the I 2 C interface must be driven by an external device See section 1 4 5 o...

Page 7: ...he DAC board To set VREF 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 If you wish to supply VA externally connect a DC voltage supply to connector J2 Connect GND to the center te...

Page 8: ...ystem Settings Dialog 5 Navigate to the DAC121C08XEB Evaluation Board window 6 Configure the I 2 C Interface speed as seen in Figure 7 Standard mode Fast Mode and High Speed mode are supported Figure 7 I 2 C Speed Select 7 Configure the I 2 C address of the DAC The DAC121C085 will respond to I 2 C address 0x0C by default with pins A0 and A1 floating no jumpers on JP5 Change the I 2 C slave address...

Page 9: ... 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 ...

Page 10: ... A0 1 A1 2 SCL 3 SDA 4 VREF 7 VOUT 8 VA 6 GND 5 U1 DAC121C085 C2 0 1uF 1 2 3 4 5 6 7 JP5 ADDRESS SELECT 1 TP7 AGND 1 TP5 AGND 1 2 3 J2 VIN C1 200pF D2 RED LED 2 4 6 8 10 1 3 5 7 9 11 12 13 14 J3 WV4 R1 2K C8 0 1uF 1 TP3 AGND 1 2 J5 LED C10 0 1uF D1 RED LED R6 1K C3 1uF C7 1uF 1 2 3 JP9 VA SELECT L1 100uH OE 1 A 2 GND 3 Y 4 VCC 5 U2 NC7SZ126P5X_NL 1 2 JP8 I_VA R8 51 R9 51 1 TP2 AGND 1 2 4 3 5 J4 VO...

Page 11: ...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 Digikey S5803 21 ND WV4S 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 ...

Page 12: ...gic Input Refer to Figure 2 for a pin out diagram 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 VOUT Load Select Configures the load on VOUT Refer to Table 1 JP5 I2 C Address Select Configures the DAC s I2 C address Refer to Table 1 ...

Page 13: ...13 http www national com Blank Page ...

Page 14: ...HE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION As used herein 1 Life support devices or systems are devices or systems which a are intended for surgical implant into the body or b support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in a significant injury to the user 2 A cr...

Page 15: ...for use in safety critical applications such as life support where a failure of the TI product would reasonably be expected to cause severe personal injury or death unless officers of the parties have executed an agreement specifically governing such use Buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications and acknowledge and agre...

Page 16: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Texas Instruments DAC101C08XEB NOPB DAC081C08XEB NOPB ...

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