National Semiconductor DAC121C085 User Manual Download Page 1

Page: 1 / 16

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 DAC121C085

Page 1: ...9 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 DAC...

Page 2: ...ctional 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 B...

Page 3: ...ignal 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 Dat...

Page 4: ...o 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 Co...

Page 5: ...aluation 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 o...

Page 6: ...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 v...

Page 7: ...e 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...

Page 8: ...stem 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...

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 are...

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...

Page 11: ...D 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 ED160...

Page 12: ...ic 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...

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

Page 14: ...E 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 sustai...

Page 15: ...or 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...

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