TSA7887-EVB User`s Guide
Contents
1. down at the end of each conversion regardless of the state of the CS input ADC wake up time from full shutdown is 5us and system design should ensure that at least 5us have elapsed before attempting to perform a conversion in this mode otherwise an invalid conversion result may occur PM Mode 4 In this operating mode the TSA7887 is configured for standby operation after conversion Sections of the TSA7887 are powered down however the internal 2 5 V reference voltage remains powered up While PM Mode 4 is similar to PM Mode 3 PM Mode 4 operation allows the TSA7887 to power up much faster For optimal performance the Control Registers REF bit DB5 should be a zero 0 to ensure the internal reference is enabled remains enabled Internal 2 5V reference used Leave jumper HDR2 unconnected Internal 2 5V reference disabled External TS6001A 2 5V reference can be used If REF 0 Pin 4 is a reference voltage pin and internal 2 5V reference is used If REF 1 jumper HDR2 should be set to position 2 3 in order to use external TS6001A 2 5V reference voltage If REF 0 or 1 HDR2 is to be set to position 1 2 The device is now in two channel operation and Vpp is used as the reference voltage AINO is selected as the input signal AIN1 is selected as the input signal Table 3 TSA7887 Parameter States for evaluation with GUI Page 6 TSA7887 EVB Rev 1 0 TSA7887 Demo Board SILICON LAB DESIGNATION DESCRIPTION L2. Power Supply In order to evaluate the TSA7887 jumper J2 is to be set to position 2 3 and jumper HDR2 is to be left unconnected The default configuration for J2 and HDR2 is 1 2 and unconnected respectively Refer to Figure 5 and Table 1 The default configuration on the board is for Vpp 3 3V For this evaluation we will use an external 5V power supply and an external 5V reference voltage The following steps are to be performed 1 Connect the TSA7887 demo board to the ViperBoard via the 34 pin socket X1 2 With the HP6624A power supply connect the positive terminal of the power supply to the positive terminal on J1 and the negative terminal of the power supply to the GND terminal of J1 Set the voltage to 5V and turn it off With the Khron Hite 526 DC power supply connect the positive terminal of the power supply to terminal 2 on HDR2 and connect the negative terminal of the power supply to the GND terminal of J1 Set the voltage to 5V and turn it off 3 Set the function generator frequency amplitude and offset to 10kHz 4 98Vep and 2 5V respectively Then connect the BNC cable from the signal generator to the BNC connector AINO on the TSA7887 demo board Set the output of the signal generator to OFF 4 Turn on the power supplies TSA7887 EVB Rev 1 0 S 5 LICON LAB To run the GUI go to Start gt All Programs gt TouchStoneEvalBoard 2 2 11 gt 01 Touchstone Evaluation App The GUI should
3. IN1 each with an analog input range from O to Vrer In two channel operation the analog input range is OV to Voo With jumper HDR2 the TS6001A 2 5V external reference or input AIN1 can be selected Four power management operating modes are available namely PM Mode 1 PM Mode 4 Refer to Table 2 In two channel operation and when using the internal reference modes 1 and 3 allow a maximum sampling rate of 80ksps while using the ViperBoard Figure 5 shows the TSA7887 demo board schematic Figure 2 and Figure 3 show a picture of the top and bottom of the TSA7887 demo board respectively Figure 1 shows a picture of the TSA7887 demo board with the ViperBoard connected A USB cable is used to interface the ViperBoard to a PC with Windows Vista 32 bit Vista 64 bit XP 7 For the Touchstone ADC Evaluation Platform GUI user s manual and for the necessary driver and GUI installer files needed to successfully evaluate the TSA7887 with the ViperBoard please refer to www silabs com Page 2 Quick Start Procedure Equipment TSA7887 Demo Board Nano River Tech ViperBoard USB cable Computer with Windows Vista 32 bit 64 bit XP 7 Vv Vv V WV ViperBoard driver and GUI software installed to PC refer to Touchstone ADC Evaluation Platform GUI user s manual gt Low noise Signal Generator Stanford Research Systems Model DS360 or better w BNC cable gt HP 6624A DC Power Supply gt Khron Hite Corp Model 526 Precision DC
4. MSOP TSA7887 Demo Board MSOP Package TSA7887DB SOIC TSA7887 Demo Board SOIC Package TSDA VB Nano River Technologies ViperBoard IFTTIIEITHHTILETEETIEATTELTIT EEEH EG ete rete EE EE EE Na pa ba pag i Figure 1 TSA7887 Evaluation Board with ViperBoard Touchstone SEMICONDUCTOR 408 383 9363 TSA7B887 DEMO BOARD 2 5 ee Ba oS Figure 2 TSA7887 Evaluation Board Figure 3 TSA7887 Evaluation Board Top View Bottom View Page 1 2014 Silicon Laboratories Inc All rights reserved TSA7887 Demo Board SILICON LABS Description The TSA7887 demo board provides an easy to use scheme for evaluating the TSA7887 The default configuration of the demo board in conjunction with the Nano River Technologies ViperBoard is for operation at a supply voltage of Vpp 3 3V The TSA7887 demo board includes a 74ALVC164245 signal level translator in order to translate signal levels from Vpp of the TSA7887 to 3 3V signal voltage levels necessary for the ViperBoard The TSA7887 and the ViperBoard are connected via an on board 34 pin socket X1 A separate power supply can be used to power the TSA7887 from 2 7V to 5 25V The TSA7887 demo can be evaluated without the ViperBoard A BNC connector is available for input AINO and AIN1 of the TSA7887 It is recommended to use a low noise signal generator in order to acquire optimal SNR and THD results The TSA7887 s provides one or two analog inputs AINO and A
5. TSA7887 Demo Board gt DC Power Supply gt Low noise Signal Generator Stanford Research oystems Model DS360 or better w BNC cable gt Ammeter In order to evaluate the TSA7887 using the TSA7887 demo board only additional input signals for the CS SCLK DIN pins will be necessary along with an oscilloscope to monitor the inputs and output The following steps are to be performed 1 Set the voltage of the power supply between 2 7V and 5 25V and turn it off Connect the positive terminal of the DC power supply to pin 12 labeled as 3 3V on X1 and the ground terminal to pin 2 labeled as GND Refer to Figure 5 2 TSA7887 Demo Board Timing signals for the TSA7887 input signals AINO AIN1 CS DIN and SCLK should be set according to the desired measurement while following the product datasheet timing specifications Refer to the TSA7887_ product datasheet Timing Specifications TSA7887 Control Register Description and Description of Operation section for details Access to these pins is available through the 34 pin socket X1 labeled as SCLK CS DIN and DOUT The corresponding pins on X1 are 10 8 5 and 6 respectively To measure the supply current of the TSA7887 place jumper J2 to position 2 3 Then apply an external power supply to J1 An ammeter can now be connected in series with the power supply for a static supply current measurement of the TSA7887 The s
6. appear and on the top right hand side the status should be PC disconnected and No Type for demo board type Both should be highlighted in red indicating that the Nano River Tech ViperBoard and the TSA7887 demo board are not connected Connect one side of the supplied USB cable to the ViperBoard USB connector Connect the other side to a USB port on the PC After approximately three seconds the status on the GUI screen will switch to PC Connected and TSA7887 indicating the ViperBoard and the TSA7887 demo board were recognized successfully by the software The green LED on the TSA7887 demo board should be ON and the green LED on the ViperBoard D2 should be ON In the TSA7887 ADC section set PMO 1 and REF 1 In the sampling section of the GUI enter 125ksps Use the default FFT length of 8192 Refer to Figure 4 and Table 2 and Table 3 Turn on the signal generator On the GUI screen click on continuous in the sampling section and monitor the results on the screen The top plot shows a samples vs code plot and the bottom plot is an FFT plot The SNR and THD values should be approximately 71dB and 80dB respectively Please refer to Figure 4 for an example of what the results should look like In this case the SNR and THD values are 71dB and 83dB respectively TSA7887 EVB Rev 1 0 TSA7887 Demo Board Additional Functions As shown in the TSA7887 ADC section of the GUI the TSA7887 mode of
7. d C10 C11 PR 1uF 10 BENE s 0603 capacitor SMD6032 4 7uF 10 capacitor SMD6032 capacitor 0603 capacitor 0805 1500 1 0603 1kQ 1 oe AINO AINI __ _2_ BNC connecior 1 2 pin terminal block X 34pinsocket J2 HDR2 U2 1 74ALVC164245 translating transceiver TS6001A TSA7887 Table 4 Component list 7 Touchstone SEMICONDUCTOR 408 383 9363 TSA7887 DEMO BOARD External PS RI6 LED m m Eres z 000000000 erelelelelelelelele 0000000 elejeje jo o o e Figure 8 Bottom Layer 1 Figure 9 Bottom Layer 2 Silicon Laboratories Inc Page 7 400 West Cesar Chavez Austin TX 78701 TSA7887 EVB Rev 1 0 1 512 416 8500 www silabs com SILICON LABS About Proset AGE simpy Do you have an innovative idea to Pd keep the world lle Mi connected gt E Explore Our Featured Products Energy friendly solut for a Smarter mor Microcontrollers Wireless amp RF Pomer op watt energy Pom Smart Connected Energy Friendly Products Quality Support and Community www silabs com products www silabs com quality community silabs com Disclaimer Silicon Laboratories intends to provide customers with the latest accurate and in depth documentation of all peripherals and modules available for system and software implementers using or intending to use the Silicon Laboratories products Characterization data available modules and peripherals memo
8. icro logo and combinations thereof the world s most energy friendly microcontrollers Ember amp EZLink amp EZMac EZRadio EZRadioPRO DSPLL ISOmodem 6G Precision328 ProSLICG SIPHYG USBXpress and others are trademarks or registered trademarks of Silicon Laboratories Inc ARM CORTEX Cortex M3 and THUMB are trademarks or registered trademarks of ARM Holdings Keil is a registered trademark of ARM Limited All other products or brand names mentioned herein are trademarks of their respective holders Silicon Laboratories Inc 400 West Cesar Chavez Austin TX 78701 USA SILICON LABS
9. operation can be selected Please refer to Figure 4 and Table 3 10 To ensure proper GUI operation always stop a continuous conversion before changing the state of any of the parameters as described in Table 3 Then make the necessary jumper connections on the board Now the parameters can be changed in the GUI according to the connections made on the TSA7887 demo board Then select continuous to run 11 To perform a single conversion press the single button in the sampling section 12 For details on the Touchstone evaluation platform GUI refer to the Touchstone ADC Evaluation Platform GUI users manual on our website at www silabs com Page 3 TSA7887 Demo Board ICON LABS E ADC Evaluation Platform Ioj xi File Help single wait for HW signal core continuous at rate 125 kSP5 Sampling section Sampling i REF SIN DUAL CH PM1 PMO TSA7887 ADC section ape C ORef enabled OAINI Vref Vref OAINO n co iRefdisabled C 1AINIjVref AIN1 C 1AINI 5 1 Displaying T5 7887 Samples vs Code plot 0 2046 4096 5144 alsz samples FFT plot is 0 10000 20000 30000 40000 SO000 60000 0000 FreqrHz FFT length alge Window Hanning SNR ose Bin Resolution is 2588 He THD 4508 Figure 4 T5A7887 Response with GUI Page 4 TSA7887 EVB Rev 1 0 SILICON LABS Evaluation with TSA7887 Demo Board Only DNI Equipment
10. ry sizes and memory addresses refer to each specific device and Typical parameters provided can and do vary in different applications Application examples described herein are for illustrative purposes only Silicon Laboratories reserves the right to make changes without further notice and limitation to product information specifications and descriptions herein and does not give warranties as to the accuracy or completeness of the included information Silicon Laboratories shall have no liability for the consequences of use of the information supplied herein This document does not imply or express copyright licenses granted hereunder to design or fabricate any integrated circuits The products must not be used within any Life Support System without the specific written consent of Silicon Laboratories A Life Support System is any product or system intended to support or sustain life and or health which if it fails can be reasonably expected to result in significant personal injury or death Silicon Laboratories products are generally not intended for military applications Silicon Laboratories products shall under no circumstances be used in weapons of mass destruction including but not limited to nuclear biological or chemical weapons or missiles capable of delivering such weapons Trademark Information Silicon Laboratories Inc Silicon Laboratories Silicon Labs SiLabs and the Silicon Labs logo CMEMS EFM EFM32 EFR Energy Micro Energy M
11. sic Lass TS5 887 Demo Board A Micropower 2 channel 125 ksps Serial Output 12 bit SAR ADC FEATURES DESCRIPTION gt Quick and easy Interface to computer for The demo board for the TSA7887 is a completely evaluation via Nano River Technologies assembled and tested circuit board that can be used ViperBoard and USB cable for evaluating the TSA7887 For easy and quick evaluation of the TSA7887 a Nano Hiver Tech gt Input BNC connection Vi iperBoard with an onboard microcontroller and gt On board 3 3V supply voltage FPGA for signal processing is available The gt On board TS6001A 2 5V reference voltage ViperBoard interfaces to any computer via USB port gt External power supply connection available and a user friendly Windows OS compatible software gt Fully Assembled and Tested is available for evaluation gt 2 2in x 3in 2 layer circuit board The TSA7887 an alternate source for the AD7887 is a self contained 2 channel high speed micropower 12 bit analog to digital converter ADC oea that operates from a single 2 7V to 5 25V power SA7887 DEMO BOARD supply The TSA7887 is capable of a 125 ksps T NN EC j2 Ho throughput rate with an external 2MHz serial clock Incense e E CO v e and draws 0 85mA supply current spipIETETRT TT 3 orp ry a h heaps Product data sheet and additional documentation can n be found at www silabs com ORDERING INFORMATION Order Number Description TSA7887DB
12. upply current should be less than 900LA Please refer to Figure 5 and table 1 Pin 4 10 13 17 19 22 24 25 28 34 39 41 43 45 48 lied to GND Pin 1 7 18 tied to VDD Pin 31 42 tied to 3 3V V VDD to pin 1 7 18 Len pon T I T 3 TAALVC164245 U3 Lc C4 TS7003 Ji yF TO 1yF External Power Supply te Figure 5 TSA7887 Evaluation Board Circuit TSA7887 EVB Rev 1 0 DIN V csiv SCLK V DOUT V to pin 31 42 3 3V V DIN V C10 C12 TO0 tyF ow S 34 pin Socket Page 5 TSATS87 Demo Beare SILICON LABS Seemed ee foe HE TSA7887DB w ES Voo 3 3V EN Refer to 34 pin et River Tech EM Table 3 socket iperBoard 5 B s 1 2 two channel 2 3 Apply 2 7 TSA7887 Only on board reference to 5 25V to Unconnected external reference or internal reference TSA7887 Only 2 7V Supply Current to Measurement 5 25V Table 1 J1 J2 HDR2 and X1 connections PM Mode 1 In this operating mode the TSA7887 s power down mode is enabled if its CS input is a one a 1 and is operating in full power mode when its CS input is a zero a O Thus the TSA7887 is powered down on a low to high CS transition and is powered up on a high to low CS transition PM Mode 2 In this operating mode and regardless of the status of any of the logic inputs the TSA7887 is always fully powered up PM Mode 3 In this operating mode the TSA7887 is automatically powered
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