Texas Instruments ADS8920BEVM-PDK Скачать руководство пользователя страница 20 | Manualshive

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Texas Instruments ADS8920BEVM-PDK Скачать руководство пользователя страница 20

ADS8920BEVM-PDK Operation

20

SBAU270 – July 2016

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Copyright © 2016, Texas Instruments Incorporated

ADS8920BEVM-PDK

Figure 12. Spectral Analysis Tool

Finally, the FFT tool includes windowing options that are required to mitigate the effects of non-coherent
sampling (this discussion is beyond the scope of this document). The 7-Term Blackman Harris window is
the default option and has sufficient dynamic range to resolve the frequency components of up to a 24-bit
ADC. Note that the

None

option corresponds to not using a window (or using a rectangular window) and is

not recommended.

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Содержание ADS8920BEVM-PDK

Страница 1: ...PDK This kit is an evaluation platform for the ADS8920B which is an 16 bit 1 MSPS fully differential input successive approximation register SAR analog to digital converter ADC that features an enhanc...

Страница 2: ...Materials PCB Layout and Schematics 25 7 1 Bill of Materials 25 7 2 PCB Layout 28 7 3 Schematics 31 List of Figures 1 OPA625 Differential Input Driving Path 6 2 Common Mode Selection Jumpers 7 3 ADS8...

Страница 3: ...ted ADS8920BEVM PDK 1 J7 and J3 SMA Connectors Description 5 2 J4 and J6 Headers Description 5 3 J1 and J2 Configuration per Input Common Mode 7 4 External Source Requirements for Evaluation of the AD...

Страница 4: ...USB cable to connect to a computer 1 1 ADS8920BEVM PDK Features The ADS8920BEVM PDK includes the following features Hardware and software required for diagnostic testing as well as accurate performan...

Страница 5: ...ce must be differential or balanced keeping the negative and positive inputs to the board symmetric such that Vs Vs at any given time Table 1 J7 and J3 SMA Connectors Description Pin Number Signal Des...

Страница 6: ...he two OPA625 operational amplifiers drive the ADS8920B differential inputs with 2 2 impedance up to 7 MHz that properly drives the low dynamic impedance of the ADC inputs at 1 MSPS Figure 1 OPA625 Di...

Страница 7: ...to the 1 k of the input resistor thereby moving the output common mode of the OPA625 amplifiers To compensate for this change in output common mode R1 can be modified according to the particular exte...

Страница 8: ...g conditions at a full device throughput of 1 MSPS 3 Digital Interfaces As noted in Section 1 the EVM interfaces with the PHI that in turn communicates with the computer over USB There are two devices...

Страница 9: ...inimize inductance along the load current path 5 ADS8920BEVM PDK Initial Setup This section explains the initial hardware and software setup procedure that must be completed for the proper operation o...

Страница 10: ...yright 2016 Texas Instruments Incorporated ADS8920BEVM PDK Figure 3 ADS8920B Software Installation Prompts As a part of the ADS8920BEVM GUI installation a prompt with a Device Driver Installation will...

Страница 11: ...S8920BEVM PDK NOTE A notice may appear on the screen stating that Widows cannot verify the publisher of this driver software Select Install this driver software anyway The ADS8920BEVM PDK requires Lab...

Страница 12: ...2016 Submit Documentation Feedback Copyright 2016 Texas Instruments Incorporated ADS8920BEVM PDK After these installations verify that C Program Files x86 Texas Instruments ADS8920BEVM is as shown in...

Страница 13: ...er and evaluating the performance of the ADS8920B 1 Connect the ADS8920BEVM to the PHI Install the two screws as indicated in Figure 7 2 Use the USB cable provided to connect the PHI to the computer L...

Страница 14: ...on www ti com 14 SBAU270 July 2016 Submit Documentation Feedback Copyright 2016 Texas Instruments Incorporated ADS8920BEVM PDK 3 Launch the ADS8920BEVM GUI software as shown in Figure 8 Figure 8 Launc...

Страница 15: ...options in this pane allow the user to choose from various SPI and multiSPI host interface options available on the ADS8920B The host always communicates with the ADS8920B using the standard SPI prot...

Страница 16: ...DC sampling rate can differ from the target value depending on the applied SCLK frequency and selected Device Mode and the closest match achievable is displayed This pane therefore allows the user to...

Страница 17: ...ues on this page correspond to the Host Configuration Settings that enable ADC sampling at the maximum sampling rate specified for the ADC The register values can be edited by double clicking the corr...

Страница 18: ...rive circuits The user can trigger a capture of the data of the selected number of samples from the ADS8920B as per the current interface mode settings using the capture button as indicated in Figure...

Страница 19: ...in Table 4 Table 4 External Source Requirements for Evaluation of the ADS8920B Specification Description Specification Value Signal frequency 2 kHz External source type Balanced differential External...

Страница 20: ...ncludes windowing options that are required to mitigate the effects of non coherent sampling this discussion is beyond the scope of this document The 7 Term Blackman Harris window is the default optio...

Страница 21: ...erated by the various sources connected to the ADC when measuring a dc signal The cumulative effect of noise coupling to the ADC output from sources such as the input drive circuits the reference driv...

Страница 22: ...d the external source must meet the requirements in Table 5 Table 5 External Source Requirements for ADS8920B Evaluation Specification Description Specification Value Signal frequency 2 kHz External s...

Страница 23: ...a low noise dc differential input to the ADC Set the parameters for the Reference Settling test The various test parameters are Samples This parameter defines the number of consecutive samples to be c...

Страница 24: ...ADS8920BEVM PDK Operation www ti com 24 SBAU270 July 2016 Submit Documentation Feedback Copyright 2016 Texas Instruments Incorporated ADS8920BEVM PDK Figure 15 Reference Settling Tool...

Страница 25: ...3 ZRB18AD71A106KE01L 5 C13 C39 C45 C50 C51 MuRata CAP CERM 10 F 10 V 10 X7T 0603 GRM1885C1H102FA01J 3 C16 C31 C42 MuRata CAP CERM 1000 pF 50 V 1 C0G NP0 0603 C2012X7S1A226M125AC 1 C20 TDK CAP CERM 22...

Страница 26: ...nt Compact SMT 5015 2 TP6 TP7 Keystone Test Point Miniature SMT REF5050AIDGKT 1 U1 Texas Instruments Low Noise Very Low Drift Precision Voltage Reference 40 to 125 degC 8 pin VSSOP DGK Green RoHS no S...

Страница 27: ...u Co Ltd RES 4 99 k 0 1 0 1 W 0603 RG1608P 2491 B T5 0 R22 Susumu Co Ltd RES 2 49 k 0 1 0 1 W 0603 ERJ 3RQFR22V 0 R25 R26 Panasonic RES 0 22 ohm 1 0 1W 0603 RG1608P 303 B T5 0 R27 Susumu Co Ltd RES 30...

Страница 28: ...s www ti com 28 SBAU270 July 2016 Submit Documentation Feedback Copyright 2016 Texas Instruments Incorporated ADS8920BEVM PDK 7 2 PCB Layout Figure 16 through Figure 19 illustrate the EVM PCB layout F...

Страница 29: ...com Bill of Materials PCB Layout and Schematics 29 SBAU270 July 2016 Submit Documentation Feedback Copyright 2016 Texas Instruments Incorporated ADS8920BEVM PDK Figure 17 ADS8920BEVM PCB Layer 2 GND...

Страница 30: ...Materials PCB Layout and Schematics www ti com 30 SBAU270 July 2016 Submit Documentation Feedback Copyright 2016 Texas Instruments Incorporated ADS8920BEVM PDK Figure 18 ADS8920BEVM PCB Layer 3 Power...

Страница 31: ...Schematics 31 SBAU270 July 2016 Submit Documentation Feedback Copyright 2016 Texas Instruments Incorporated ADS8920BEVM PDK Figure 19 ADS8920BEVM PCB Layer 4 Bottom Layer 7 3 Schematics Figure 20 thro...

Страница 32: ...F C35 AGND AGND 1 2 3 J6 TSM 103 01 L SV AGND 1 F C36 AGND 0 R52 5 2V 1 F C40 AGND 1 F C38 AGND EVM_DVDD REF_BUF 0 01 F C34 AGND 0 01 F C37 10 F C28 DNP 10 F C29 DNP 10 F C27 DNP 10 F C24 DNP AGND AGN...

Страница 33: ...DNP AGND 1 F 0603 C5 AGND AGND 47 F C3 AGND 5 2V 0 1 R2 AGND 1 F C2 AGND 5 2V 0 22 R8 10 F C4 AGND 5016 TP4 REFOUT 10 0k R5 20 0k R15 20 0k R10 AGND J2 87898 0204 AGND J1 87898 0204 280k R1 1 F C6 AGN...

Страница 34: ...B Logo3 FCC disclaimer Rafael Ordonez H5 1891 H8 1891 H6 1891 H7 1891 H1 PMSSS 440 0025 PH H2 PMSSS 440 0025 PH H3 PMSSS 440 0025 PH H4 PMSSS 440 0025 PH LOGO PCB Logo2 Texas Instruments Label Assembl...

Страница 35: ...ing the warranty period to the address designated by TI and that are determined by TI not to conform to such warranty If TI elects to repair or replace such EVM TI shall have a reasonable time to repa...

Страница 36: ...transmitter has been approved by Industry Canada to operate with the antenna types listed in the user guide with the maximum permissible gain and required antenna impedance for each antenna type indic...

Страница 37: ...ified allowable ranges some circuit components may have elevated case temperatures These components include but are not limited to linear regulators switching transistors pass transistors current sens...

Страница 38: ...REMOVAL OR REINSTALLATION ANCILLARY COSTS TO THE PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES RETESTING OUTSIDE COMPUTER TIME LABOR COSTS LOSS OF GOODWILL LOSS OF PROFITS LOSS OF SAVINGS LOSS OF USE L...

Страница 39: ...sponsible for compliance with all legal regulatory and safety related requirements concerning its products and any use of TI components in its applications notwithstanding any applications related inf...

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