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July 2001

Mixed-Signal Products

User’s Guide

SLOU118

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Summary of Contents for THS4121

Page 1: ...July 2001 Mixed Signal Products User s Guide SLOU118...

Page 2: ...esign TI does not warrant or represent that any license either express or implied is granted under any patent right copyright mask work right or other intellectual property right of TI covering or rel...

Page 3: ...handling or use of the goods Please be aware that the products received may not be regulatory compliant or agency certified FCC UL CE etc Due to the open construction of the product it is the user s r...

Page 4: ...here is uncertainty as to the load specification please contact a TI field representative During normal operation some circuit components may have case temperatures greater than 60 C The EVM is design...

Page 5: ...awareness It is recommended that the user initially review the data sheet of the device under test It is also helpful to review the schematic and layout of the THS4121 EVM to determine the design tech...

Page 6: ...et literature number SLOS319A Application report literature number SLOA054B Fully Differential Amplifiers FCC Warning This equipment is intended for use in a laboratory test environment only It gen er...

Page 7: ...t Configuration 1 3 1 5 THS4121 EVM Schematic 1 4 1 6 Additional Sample Schematics 1 5 1 7 THS4121 EVM Layout 1 7 2 Using the THS4121 EVM 2 1 2 1 Required Equipment 2 2 2 2 Power Supply Setup 2 2 2 3...

Page 8: ...ansformer 1 5 1 5 VICR Level Shifter 1 6 1 6 Butterworth Filter With Multiple Feedback 1 6 1 7 Top Layer Silkscreen 1 7 1 8 Top Layer 1 Signals 1 7 1 9 Internal Plane Layer 2 Ground Plane 1 8 1 10 Int...

Page 9: ...of the EVM In addition the schematic of the default circuit has been added to depict the components mounted on the EVM when it is received by the customer This configuration correlates to the single...

Page 10: ...t it to the mid rail Having the input signal centered at the mid rail reduces the peaking effect RPU resistors in this EVM work as input signal level shifters Therefore they can be used to shift the i...

Page 11: ...range see the device data sheet Supply current ICC see the device data sheet Output drive IO see the device data sheet For complete THS4121 amplifier IC specifications parameter measurement informati...

Page 12: ...THS4121 EVM Schematic 1 4 Introduction and Description 1 5 THS4121 EVM Schematic Figure 1 2 Schematic 150 150 150 150 VDD VDD VSS VSS VDD VSS VDD VSS VDD VDD...

Page 13: ...mination Resistor R3a R6b Note Fully differential in fully differential out signal path See the Texas Instruments February 2001 Analog Applications Journal for the information on the termination resis...

Page 14: ...U1 RPU2 VSS Note Shiftingthe VICR within the specified range in the data sheet via RPU1 and RPU2 if the VICR is out of the specified range See the Application section of the data sheet for the THS4121...

Page 15: ...ayout 1 7 Introduction and Description 1 7 THS4121 EVM Layout Figure 1 7 Top Layer Silkscreen TEXAS INSTRUMENTS THS4121 EVM REV A VDD VSS Figure 1 8 Top Layer 1 Signals TEXAS INSTRUMENTS THS4121 EVM R...

Page 16: ...THS4121 EVM Layout 1 8 Introduction and Description Figure 1 9 Internal Plane Layer 2 Ground Plane Figure 1 10 Internal Plane Layer 3 Power Plane...

Page 17: ...THS4121 EVM Layout 1 9 Introduction and Description Figure 1 11 Bottom Layer 4 Ground and Signal...

Page 18: ...1 10 Introduction and Description...

Page 19: ...ous EVM terminals and their functions In addition it suggests the components and equipment needed to operate the EVM Topic Page 2 1 Required Equipment 2 2 2 2 Power Supply Setup 2 2 2 3 Input and Outp...

Page 20: ...upply to 1 65 V 2 Make sure the dc power supply is turned off before proceeding to the next step 3 Connect the positive terminal of the power supply to the positive terminal of the current meter numbe...

Page 21: ...ion generator to J1 VI on the EVM 5 Using a BNC to SMA cable connect the oscilloscope to J3 VO on the EVM 6 Using a BNC to SMA cable connect the oscilloscope to J4 VO on the EVM Set the oscilloscope t...

Page 22: ...Turn on the function generator 4 Verify the oscilloscope is showing two 1 MHz sine waves with amplitude of 0 125 V The dc offset of the signal must be below 50 mV Note VOUT and VOUT should be 180 deg...

Page 23: ...o consider the following steps to ensure optimal performance in terms of bandwidth phase margin gain and peaking 1 Connect the power supply according to the power supply set up section 2 2 2 Use prope...

Page 24: ...at the center point of the power supply For example if 1 65 sources are used the VOCM level will be set to zero 2 7 Butterworth Filter An example of a Butterworth filter implemented with multiple feed...

Page 25: ...C4 C5 C6 Capacitor 0 1 F ceramic 0805 4 Murata GRM40 X7R104K25 C7 C8 Capacitor 6 8 F 35 V 20 tantalum SM 7343 2 Sprague 293D685X9035D2T C1A C1B C2 C3A C3B Open 0805 5 J1 J2 J3 J4 SMT_PCB_MT SMA jack...

Page 26: ...sistor 150 1 0805 2 Digi Key R11 Resistor 10 k 1 0805 1 Digi Key P10 KCTR ND R10 RX3 RX6 Resistor 49 9 1 1206 3 Digi Key P49 9FTR ND R16 R7 Open 1206 2 R36aA R36aB R36bA R36bB High precision resistor...

Page 27: ...nce This improves high frequency bypassing and reduces harmonic distortion A proper ground plane on both sides of the PCB should be used with high speed circuit design This provides low inductive grou...

Page 28: ...g a transmission line with its characteristic impedance the amplifier s load then appears to be purely resistive and reflections are absorbed at each end of the line Another advantage of using an outp...

Page 29: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Texas Instruments THS4121EVM...

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