National Semiconductor ADC121S625B User Manual Download | Manualshive

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http://www.national.com

National

Semiconductor

July 25, 2006

Rev - 2.1/CS

RoHS Compliant

Evaluation Board User's Guide

ADC121S625 12-Bit, 50 kSPS to 200 kSPS, Differential

Input, Micro-Power Sampling A/D Converter

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Summary of Contents for ADC121S625B

Page 1: ...ttp www national com National Semiconductor July 25 2006 Rev 2 1 CS RoHS Compliant Evaluation Board User s Guide ADC121S625 12 Bit 50 kSPS to 200 kSPS Differential Input Micro Power Sampling A D Converter ...

Page 2: ...nal Description 5 4 1 The Signal Input 5 4 2 ADC Reference Circuitry 5 4 3 ADC Clock Circuit 5 4 4 Digital Data Output 5 4 5 Power Supply Connections 5 5 0 Software Operation and Settings 6 6 0 Hardware Schematic 7 7 0 Evaluation Board Specifications 8 8 0 ADC121S625B Evaluation Board Bill of Materials 8 9 0 Tables of Test Points Jumpers and Connectors 9 ...

Page 3: ...and running WaveVision4 software The WaveVision4 program can be downloaded from the web at http www national com adc The WaveVision4 software operates under Microsoft Windows The signal at the Analog Input is digitized captured and displayed on a PC monitor in the time and frequency domain The software will perform an FFT on the captured data upon command This FFT plot shows dynamic performance in...

Page 4: ...rential signal sources centered at a DC bias point should be connected across pins 1 3 of J3 Pin 2 of J3 is ground 7 Remove the shorts across pins 1 2 and pins 3 4 of JP2 when driving the ADC input from J3 8 Select the 2 5V shunt voltage reference as VREF by shorting pins 2 3 of JP1 or select VA as VREF by shorting pins 1 2 of JP1 If it is desirable to provide an external reference voltage the jum...

Page 5: ...VREF by shorting pins 1 2 of JP1 If it is desirable to provide an external reference voltage the jumper must be removed from JP1 and pin 2 may be driven directly If it is desirable to change the LM4040DIM3 2 5 to an LM4040 with a different voltage carefully remove it and adjust the value of R3 to limit the current through the LM4040 4 3 ADC Clock Circuit The crystal based oscillator provided on th...

Page 6: ... outlined in Section 3 2 are completed click on Acquire then Samples from the Main Menu you can also press the F1 shortcut key If a dialog box opens select Discard or press the Escape key to start collecting new updated samples A plot of the selected number of samples will be displayed Make sure there is no clipping of data samples The samples may be further analyzed by clicking on the magnifying ...

Page 7: ...forated Board A rea 5P0V J3 VIN_DC 1 2 3 U3 24C02 A0 1 A1 2 A2 3 GND 4 SDA 5 SCL 6 WP 7 VCC 8 C4 1 0uF C3 0 1uF C7 470pF CSB WV 4 C8 470pF A GND TP7 AGND 1 SCLK A GND TP6 AGND 1 CLKSEND C12 0 1uF TP4 VA 1 TP5 3P3V 1 JP2 HEADER 2X2 2 4 1 3 R10 0 SDA R9 NS SCL 3P3V CSB 3P3V SCLK CLKSEND V IN_DC WV 4S CLKSEND CLKSEND J1 WV4S 2 4 6 8 10 12 14 1 3 5 7 9 11 13 C14 1 0uF J5 5P0V_REMOTE 1 2 SCLK DOUT DOUT...

Page 8: ...e header Digikey S5803 21 ND WV4S 13 1 J2 header Digikey S1011E 36 ND VIN_AC 14 1 J3 header Digikey S1011E 36 ND VIN_DC 15 1 J4 header Digikey S2041E 30 ND WV4 16 1 J5 term_block Digikey ED1609 ND 5P0V_REMOTE 17 1 J6 BNC Digikey ARF1177 ND CLK 18 2 L1 L2 sm l_1210 Digikey 445 15435 1 ND 100uH 19 1 R1 sm r_0805 P2 0KATR ND 2K 20 2 R3 R2 sm r_0805 311 5 10KCRTR ND 5 1K 21 6 R4 R5 R9 R10 R15 R16 sm r...

Page 9: ...S625B Evaluation Board J1 WV4S 14 pin dual row right angle male header Connects to WV4S board J2 VIN_AC Three pin male header Differential AC input J3 VIN_DC Three pin male header Differential DC input J4 WV4 14 pin dual row male header Connects to WV4 board J5 5P0V_REMOTE Terminal Block Power connector for 5P0V J6 CLK_IN BNC Connector External clock input Selection Jumpers on the ADC121S625B Eval...

Page 10: ... 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 componen...

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