National Semiconductor ADC121C021 User Manual Download

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NOTE: The Evaluation Board is shipped with the Alert Option of the ADC. To
evaluate the Address Option, please order samples from

www.national.com

National

Semiconductor

January 3, 2008

Rev – 1.1/CC

RoHS Compliant

Evaluation Board User's Guide

C-Compatible, 12-Bit, 10-Bit, or 8-Bit

Analog-to-Digital Converter (ADC) with Alert Function

12-bit 10-bit 8-bit

ALERT Option

ADC121C021

ADC101C021

ADC081C021

ADDRESS Option

ADC121C027

ADC101C027

ADC081C027

Summary of Contents for ADC121C021

Page 1: ...from www national com National Semiconductor January 3 2008 Rev 1 1 CC RoHS Compliant Evaluation Board User s Guide I2 C Compatible 12 Bit 10 Bit or 8 Bit Analog to Digital Converter ADC with Alert F...

Page 2: ...rcuitry 7 4 4 I 2 C Interface 7 4 5 Alert Function 7 4 6 Automatic Conversion Mode 8 4 7 Power Supply Connections 8 5 0 Software Operation and Settings 8 5 1 Software Quick Start 8 5 2 Data Analysis 9...

Page 3: ...he board to evaluate the ADC121C021 s performance In the Computer mode data capture and evaluation are simplified by connecting the evaluation board to National Semiconductor s WaveVision 4 Data Captu...

Page 4: ...ut signal Figure 3 Figure 2 DC Coupled Input Configuration Figure 3 AC Coupled Input Configuration If needed the input can be terminated by adding an appropriate termination resistor at R3 The V_IN fo...

Page 5: ...ent limit to power connector TP7 Ground TP6 4 Move the shorting jumper at JP5 to pins 9 10 NOTE only two consecutive pins may be shorted on JP5 at a time 5 Turn on the power supply 6 Connect the input...

Page 6: ...oftware Operation and Settings to setup the WaveVision 4 software 4 0 Functional Description 4 1 Jumper Settings Table 1 describes the function of the various jumpers on the ADC121C021 evaluation boar...

Page 7: ...e better than 90dBc THD 4 3 ADC Reference Circuitry The ADC121C021 family is internally referenced Therefore the Analog to Digital converter gets its reference from the analog supply VA Hence a clean...

Page 8: ...ating in the computer mode the supply voltage for VA can be applied externally or supplied directly by the WV4 board through J1 The external supply voltage is selected by placing a jumper across pins...

Page 9: ...rt function and Automatic Conversion Mode are setup through the Configuration register After making changes to a register value press the Enter key to write the register Figure 10 10 To capture a data...

Page 10: ...the Control Panel window Each of the registers is read and displayed in the control panel To write to a register simply type in the 8 bit or 16 bit hex value to be written to the register and press En...

Page 11: ...tions D and E 5 4 2 Solutions Solution A Ensure power is supplied to the VA supply on the board A single jumper must be placed across either pins 1 2 pins 3 4 pins 7 8 or pins 9 10 of JP5 to select th...

Page 12: ...nd Located at the bottom right of the board TP9 WV_CLK_IN Not Used TP10 AGND Ground Located at the right side of the board Connectors on the ADC121C021 Evaluation Board J1 WV4S 14 pin dual row right a...

Page 13: ...7 9 JP5 1 1 TP7 VA_EXT L3 0 Ohm R 1 2 JP7 VA_EXT_SHUNT R12 0 1 1 VIA6 C7 10 0uF 1 2 JP2 V_PULL L1 100uH 1 2 3 JP1 INPUT SELECT 1 1 TP10 AGND 1 1 VIA5 R10 0 1 1 TP6 AGND C4 0 1uF R6 20 1 1 VIA10 R2 0 R...

Page 14: ...national com 14 9 0 Evaluation Board Layers Figure 11 ADC121C021 Evaluation Board All Layers with Silk Screen Figure 12 ADC121C021 Evaluation Board Top Layer Figure 13 ADC121C021 Evaluation Board Bott...

Page 15: ...513 40 ND 1 JP8 NS JUMPER 1 J1 WV4S HEAD Digikey S5803 07 ND Sullins PRPN072PARN RC 1 J2 V_IN TP Center Via of SMA Digikey 5011K ND 2 L1 L2 100uH IND Digikey 490 1056 1 ND Murata BLM31PG121SN1L 1 L3 0...

Page 16: ...THE 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 sus...

Page 17: ...ncy energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC or ICES 003 rules which are designed to provide reasonable protection against radio fr...

Page 18: ...na type and its gain should be so chosen that the equivalent isotropically radiated power e i r p is not more than that necessary for successful communication This radio transmitter has been approved...

Page 19: ...roduct only after you obtained the license of Test Radio Station as provided in Radio Law of Japan with respect to this product or 3 Use of this product only after you obtained the Technical Regulatio...

Page 20: ...property damage personal injury or death If there are questions concerning these ratings please contact a TI field representative prior to connecting interface electronics including input power and in...

Page 21: ...egulatory and safety related requirements concerning its products and any use of TI components in its applications notwithstanding any applications related information or support that may be provided...

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