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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 ADC121C02XEB, ADC101C02XEB, and ADC081C02XEB 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. 

LIFE SUPPORT POLICY 

NATIONAL'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR 
SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF 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 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 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. 

 

National Semiconductor Corporation

 

Americas

 

Tel:      1-800-272-9959 
Fax:     1-800-737-7018 
Email: [email protected] 

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Email: [email protected] 
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English   Tel: +49 (0) 870 24 0 2171 
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National Semiconductor 
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Response Group

 

Tel:  65-2544466 
Fax: 65-2504466 
Email:[email protected] 

National 
Semiconductor 
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Tel:   81-3-5639-7560 
Fax:  81-3-5639-7507 

www.national.com 

 

 

 

 

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.

 

Содержание ADC121C021

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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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