Texas Instruments SoundPlus INA1651EVM, User Manual, Page: 12 / 20

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Texas Instruments SoundPlus INA1651EVM User Manual Download Page 12

Board Layout

12

SBOU212 – September 2018

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Copyright © 2018, Texas Instruments Incorporated

INA1651EVM SoundPlus™ High Common-Mode Rejection Line Receiver
Evaluation Module

5

Board Layout

This section provides a description of the INA1651EVM board layout and layer illustrations.

5.1

Layout

The board layout for the INA1651EVM is shown in

and

. The top layer consists of all

signal traces and is poured with a solid ground plane. The traces of the positive input (IN+ A) and negative
input (IN- A) were kept as balanced as possible to reduce the possibility of a differential voltage from
developing due to trace impedance mismatch. The decoupling capacitors, C5, C6, C11, and C12, were
positioned as close as possible to the power supply pins of the device. Minimal traces were routed on the
bottom layer so that a large solid ground plane could be poured. Vias were placed at the ground
connection of every component to provide a low-impedance path on the bottom layer back to the supply
ground. The trace from J8 to VREF A was kept as short as possible to maintain the exceptional common-
mode rejection of the INA1651.

Figure 11. Top Layer PCB Layout

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Summary of Contents for SoundPlus INA1651EVM

Page 1: ...651EVM SoundPlus High Common Mode Rejection Line Receiver Evaluation Module This user s guide contains information for the INA1651 as well as support documentation for the INA1651 evaluation module EVM Included are the performance specifications set up procedure modifications measured data printed circuit board PCB layout schematic and bill of materials of the INA1651EVM Figure 1 INA1651 SoundPlus...

Page 2: ...2 Bill of Materials 15 6 3 Reference 15 List of Figures 1 INA1651 SoundPlus Evaluation Module EVM 1 2 Simplified INA1651EVM Schematic 3 3 RC Charging Rate 5 4 J8 Connection for Single Supply Operation 7 5 J8 Connection for Dual Supply Operation 8 6 Common Mode Rejection Ratio CMRR Measurement 15 V Supplies 1 VRMS Input 90 kHz MBW 9 7 THD N vs Amplitude Measurement 15 V Supplies 1 kHz Output 22 kHz...

Page 3: ...mmary A summary of the INA1651EVM performance specifications is provided in Table 1 Specifications are given for a supply voltage of VS 15 V at an ambient temperature of 25 C unless otherwise noted Table 1 INA1651EVM Measured Performance Summary Specification Test Conditions Measured Performance Common Mode Rejection Ratio CMRR VIN 1 VRMS at 1 kHz 90 dB THD N at 1 kHz VIN 22 dBu 121 dB Second Harm...

Page 4: ...e the output of the INA1651 Equation 1 calculates the high pass corner frequency of input A and input B due to capacitors C7 and C9 on the input where C7 C9 RIN is the differential input impedance of the INA1651 1 Equation 2 calculates the high pass corner frequency due to capacitor C8 and resistors R2 and R3 on the output 2 Resistors R2 and R3 form a voltage divider on the output of the INA1651 a...

Page 5: ... at multiple time constants Table 2 Final Capacitor Voltage Time Constant τRC Final Capacitor Voltage 1 63 2 2 86 4 3 95 0 4 98 1 5 99 3 6 99 7 To decrease the settling time of the VMID OUT voltage the Zener diode D1 can be populated The Zener voltage of the diode should be chosen to be greater than 100 mV more than one half of the supply voltage Equation 6 calculates the recommended Zener voltage...

Page 6: ...beled as VCC the negative power supply connections are labeled as VEE and the ground connections are labeled as GND For the minimum and maximum supply voltages of the INA1651EVM refer to the INA1651 product data sheet SBOS818 4 2 Input Connections Input signals for the input are applied to the INA1651EVM through the use of the female XLR connector J1 or terminal block J3 The female XLR connector f...

Page 7: ...es the option to connect pins VREF A and COM A to ground or VMID OUT In single supply operation place a shunt in the upper position pins 2 to 3 of J8 as indicated by the red box in Figure 4 to connect VREF A and COM A pins to VMID OUT Figure 4 J8 Connection for Single Supply Operation For dual supply operation place a shunt in the lower position pins 1 to 2 of J8 as indicated by the red box in Fig...

Page 8: ...om 8 SBOU212 September 2018 Submit Documentation Feedback Copyright 2018 Texas Instruments Incorporated INA1651EVM SoundPlus High Common Mode Rejection Line Receiver Evaluation Module Figure 5 J8 Connection for Dual Supply Operation ...

Page 9: ...rms common mode signal to the input and measuring the gain of the signal at the output The frequency of the input signal was swept from 20 Hz to 90 kHz and the measurement bandwidth of the Audio Precision APx555 was set to 90 kHz Figure 6 shows a measurement of the CMRR Figure 6 Common Mode Rejection Ratio CMRR Measurement 15 V Supplies 1 VRMS Input 90 kHz MBW 4 6 THD N vs Amplitude The THD N vs A...

Page 10: ...rmed by sweeping the input signal from 20 Hz to 20 kHz with the measurement bandwidth of the Audio Precision APx555 set to 90 kHz Figure 8 shows the THD N vs Frequency measurement with an amplitude of 1 VRMS on the output of the INA1651 Note that capacitor C8 on the output of the INA1651 can increase distortion at low frequencies due to non linear effects of the capacitor Therefore capacitor C8 is...

Page 11: ...018 Texas Instruments Incorporated INA1651EVM SoundPlus High Common Mode Rejection Line Receiver Evaluation Module 4 8 Fast Fourier Transform FFT The FFT measurements were taken with a 1 kHz 10 VRMS signal on the output of the INA1651 A 10 VRMS fundamental corresponds to 0 dBc in the FFT measurement Figure 10 shows an FFT of the INA1651 output The second harmonic was measured to be 142 86 dBc Figu...

Page 12: ... the positive input IN A and negative input IN A were kept as balanced as possible to reduce the possibility of a differential voltage from developing due to trace impedance mismatch The decoupling capacitors C5 C6 C11 and C12 were positioned as close as possible to the power supply pins of the device Minimal traces were routed on the bottom layer so that a large solid ground plane could be poured...

Page 13: ...yout 13 SBOU212 September 2018 Submit Documentation Feedback Copyright 2018 Texas Instruments Incorporated INA1651EVM SoundPlus High Common Mode Rejection Line Receiver Evaluation Module Figure 12 Bottom Layer PCB Layout ...

Page 14: ...2018 Texas Instruments Incorporated INA1651EVM SoundPlus High Common Mode Rejection Line Receiver Evaluation Module 6 Schematic Bill of Materials and Reference This section contains the schematic bill of materials and references for the INA1651EVM 6 1 Schematic Figure 13 illustrates the EVM schematic Figure 13 Schematic ...

Page 15: ...stone J1 J2 J3 3 Standard Banana Jack Uninsulated 5 5mm Keystone_575 4 575 4 Keystone J4 1 Terminal Block 3 5mm Pitch 3x1 TH 10 5x8 2x6 5mm ED555 3DS On Shore Technology J5 1 Header 100mil 2x1 Tin TH Header 2 PIN 100mil Tin PEC02SAAN Sullins Connector Solutions J6 1 Receptacle 160mil 3 Position R A TH Receptacle 160mil 3 Position R A TH PQG3FRA112 Switchcraft J7 1 RCA Jack 1Pos Tin Red R A TH RCA ...

Page 16: ...y set forth above or credit User s account for such EVM TI s liability under this warranty shall be limited to EVMs that are returned during 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 repair such EVM or provide replacements Repaired EVMs shall be warr...

Page 17: ...the user guide with the maximum permissible gain and required antenna impedance for each antenna type indicated Antenna types not included in this list having a gain greater than the maximum gain indicated for that type are strictly prohibited for use with this device Concernant les EVMs avec antennes détachables Conformément à la réglementation d Industrie Canada le présent émetteur radio peut fo...

Page 18: ...ed loads Any loads applied outside of the specified output range may also result in unintended and or inaccurate operation and or possible permanent damage to the EVM and or interface electronics Please consult the EVM user guide prior to connecting any load to the EVM output If there is uncertainty as to the load specification please contact a TI field representative During normal operation even ...

Page 19: ...COST OF 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 LOSS OF DATA OR BUSINESS INTERRUPTION NO CLAIM SUIT OR ACTION SHALL BE BROUGHT AGAINST TI MORE THAN TWELVE 12 MONTHS AFTER THE EVENT THAT GAVE RISE TO THE CAUSE OF ACTION HAS OCCURRED 8 2 Specif...

Page 20: ...se resources are subject to change without notice TI grants you permission to use these resources only for development of an application that uses the TI products described in the resource Other reproduction and display of these resources is prohibited No license is granted to any other TI intellectual property right or to any third party intellectual property right TI disclaims responsibility for...

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