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Texas Instruments THS4012, User Manual

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Texas Instruments THS4012 User Manual Download Page 27

2-1

Reference

 

Reference

This chapter includes a complete schematic, parts list, and PCB layout
illustrations for the THS4012 EVM.

Topic

Page

2.1

THS4012 EVM Complete Schematic

2–2

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

2.1

THS4012 Dual High-Speed Operational Amplifier EVM Parts List

2–3

. . 

2.2

THS4012 EVM Board Layouts

2–4

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Chapter 2

Summary of Contents for THS4012

Page 1: ...THS4012 Dual High Speed Operational Amplifier Evaluation Module May 1999 Mixed Signal Products User s Guide SLOU041...

Page 2: ...ED INTENDED AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN LIFE SUPPORT APPLICATIONS DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS Inclusion of TI products in such applications is understood to...

Page 3: ...ronment only It generates uses and can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to subpart J of part 15 of FCC rules which ar...

Page 4: ...iv...

Page 5: ...Using The THS4012 EVM In The Inverting Mode 1 9 1 7 THS4012 EVM Differential Input 1 10 1 8 Using The THS4012 EVM WIth Differential Inputs 1 14 1 9 THS4012 EVM Specifications 1 14 1 10 THS4012 EVM Per...

Page 6: ...c Differential Input Inverting Operation 1 12 1 6 THS4012 EVM Frequency Response with Gain 2 1 15 1 7 THS4012 EVM Phase Response with Gain 2 1 15 1 8 PowerPAD PCB Etch and Via Pattern 1 17 1 9 Maximum...

Page 7: ...sign and thermal considerations Topic Page 1 1 Feature Highlights 1 2 1 2 Description 1 3 1 3 THS4012 EVM Noninverting Operation 1 4 1 4 Using The THS4012 EVM In The Noninverting Mode 1 6 1 5 THS4012...

Page 8: ...3 dB at 15 VCC and Gain 2 J 5 V to 15 V Operation J Noninverting Single Ended Inputs Inverting Capable Through Component Change J Module Gain Set to 2 Noninverting Adjustable Through Compo nent Chang...

Page 9: ...TEXAS R2 R3 R4 R5 R6 C3 R7 C5 C4 R8 R9 R10 R11 R12 R13 R14 C6 R15 J5 Vout2 J1 Vin1 J4 Vin2 Note The EVM is shipped with the following component locations empty C3 C6 R2 R4 R8 R10 R12 Although the THS4...

Page 10: ...8 2 3 R3 0 R5 1 k R6 1 k VCC C3 x F R7 49 9 Vout1 J3 C4 0 1 F VCC J1 Vin1 R1 49 9 U1 B THS4012 7 6 5 R11 0 R13 1 k R14 1 k C6 x F R15 49 9 Vout2 J5 J4 Vin2 R9 49 9 C5 0 1 F The gain of the EVM can eas...

Page 11: ...output will divide the output signal level by a factor of 2 assuming the output isolation resistor on the EVM board remains 50 Similar effects can occur at the input depending upon how the input signa...

Page 12: ...ck J2 locations marked VCC and VCC 4 Connect an oscilloscope to the module SMA output connector J3 J5 through a 50 nominal impedance cable an oscilloscope having a 50 input termination is preferred fo...

Page 13: ...o the R4 location on the board 2 Move resistor R11 to the R10 location and R13 to the R12 location on the board This configuration is shown in Figure 1 3 Note that compensation capacitors C3 and C6 ar...

Page 14: ...T Channel 2 where RT is the source impedance Any resistor on the EVM board can be replaced with a resistor of a different value however care must be taken because the surface mount solder pads on the...

Page 15: ...s to the module terminal block J2 locations marked VCC and VCC 4 Connect an oscilloscope to the module SMA output connector J3 J5 through a 50 nominal impedance cable an oscilloscope having a 50 input...

Page 16: ...dding a resistor on the board 1 Remove resistors R1 and R9 2 Add a 100 resistor to the R8 location on the board This configuration noninverting is shown in Figure 1 4 For a noninverting differential i...

Page 17: ...EVM board remains 50 Similar effects can occur at the input depending upon how the input signal sources are configured The gain equations given above assume no signal loss in either the input or the...

Page 18: ...the EVM inputs can easily be changed to support a particular application by changing the ratio of resistors R6 and R4 channel 1 and R14 and R12 channel 2 as described in the following equation Inverti...

Page 19: ...t will divide the output signal level by a factor of 2 assuming the output isolation resistor on the EVM board remains 50 Similar effects can occur at the input depending upon how the input signal sou...

Page 20: ...ope having a 50 input termination is preferred for examining very high frequency signals 5 Set the power supply to ON 6 Connect the differential signal input across the module SMA input con nectors J1...

Page 21: ...THS4012 EVM Frequency Response with Gain 2 f Frequency Hz 1 0 1M 4 100k 2 3 500M Output Amplitude dB 5 7 6 10M 100M VCC 5 V and 15 V VO 0 2 VRMS RL 150 1 Figure 1 7 shows the typical phase response o...

Page 22: ...mize stray capacitance and reduce ground plane noise coupling into these pins This is especially important for the inverting pin while the amplifier is operating in the noninverting mode Because the v...

Page 23: ...king through the holes is not a problem during reflow 3 Additional vias may be placed anywhere along the thermal plane outside of the thermal pad area This helps dissipate the heat generated by the TH...

Page 24: ...re PD Maximum power dissipation of THS4012 IC watts TMAX Absolute maximum junction temperature 150 C TA Free ambient air temperature C JA JC CA JC Thermal coefficient from junction to case 4 7 C W for...

Page 25: ...nsfer of heat away from the PowerPAD IC package More details on proper board layout can be found in the THS4012 Low noise Dual Differential Receiver data sheet SLOS216 For more general information on...

Page 26: ...1 20 General...

Page 27: ...a complete schematic parts list and PCB layout illustrations for the THS4012 EVM Topic Page 2 1 THS4012 EVM Complete Schematic 2 2 2 1 THS4012 Dual High Speed Operational Amplifier EVM Parts List 2 3...

Page 28: ...lue of X are not supplied on the board but can be installed by the user to reconfigure the EVM for noninverting and or differential operation Figure 2 1 THS4012 EVM Schematic C1 6 8 F VCC 1 GND 2 VCC...

Page 29: ...re Tech Digi Key ED1515 ND J1 J3 J4 J5 Connector SMA 50 vertical PC mount through hole Amphenol ARF1205 ND R1 R7 R9 R15 Resistor 49 9 1 1 8 W SM 1206 R5 R6 R13 R14 Resistor 1 k 1 1 8 W SM 1206 R3 R11...

Page 30: ...in the following illustrations They are not to scale and appear here only as a reference Figure 2 2 THS4012 EVM Component Placement Silkscreen and Solder Pads VCC C1 C2 VCC U1 J2 GND R1 J3 Vout1 SLOP...

Page 31: ...THS4012 EVM Board Layouts 2 5 Reference Figure 2 3 THS4012 EVM PC Board Layout Component Side...

Page 32: ...THS4012 EVM Board Layouts 2 6 Reference Figure 2 4 THS4012 EVM PC Board Layout Back Side...

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