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Texas Instruments THS4012 manual

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Table of contents for the manual

  • Page 1

    May 1999 Mixed-Signal Products User ’ s Guide SLOU041[...]

  • Page 2

    IMPORT ANT NOTICE T exas Instruments (TI) reserves the right to make changes to its products or to discontinue any semiconductor product or service without notice, and advises its customers to obtain the latest version of relevant information to verify , before placing orders, that the information being relied on is current. TI warrants performance[...]

  • Page 3

    iii Chapter Title—Attribute Reference Preface Related Documentation From T exas Instruments THS4012 DUAL LOW -NOISE HIGH-SPEED OPERA TIONAL AMPLIFIER (literature number SLOS216) This is the data sheet for the THS4012 operational amplifier integrated circuit that is used in the THS4012 evaluation module. FCC Warning This equipment is intended for [...]

  • Page 4

    iv[...]

  • Page 5

    Running Title—Attribute Reference v Chapter Title—Attribute Reference Contents 1 General 1-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 Feature Highlights 1-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [...]

  • Page 6

    Running Title—Attribute Reference vi Figures 1–1 THS4012 Evaluation Module 1-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–2 THS4012 EVM Schematic — Noninverting Operation 1-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3 THS4012 EVM Schematic — Inverting Oper[...]

  • Page 7

    1-1 General General This chapter details the T exas Instruments (TI  ) THS4012 dual high-speed operational amplifier evaluation module (EVM), SLOP230. It includes a list of EVM features, a brief description of the module illustrated with a pictorial and a schematic diagram, EVM specifications, details on connecting and using the EVM, and discuss[...]

  • Page 8

    Feature Highlights 1-2 General 1.1 Feature Highlights THS4012 Dual High-Speed Operational Amplifier EVM features include: High Bandwidth — 75 MHz, –3 dB at ± 15 V CC and Gain = 2 ± 5-V to ± 15-V Operation Noninverting Single-Ended Inputs — Inverting-Capable Through Component Change Module Gain Set to 2 (Noninverting) — Adjustable Through[...]

  • Page 9

    Description 1-3 General 1.2 Description The TI THS4012 dual high-speed operational amplifier evaluation module (EVM) is a complete dual high-speed amplifier circuit. It consists of the TI THS4012 dual low-noise high-speed operational amplifier IC, along with a small number of passive parts, mounted on a small circuit board measuring approximately 1[...]

  • Page 10

    THS4012 EVM Noninverting Operation 1-4 General 1.3 THS4012 EVM Noninverting Operation The THS4012 EVM is shipped preconfigured for dual-channel noninverting operation, as shown in Figure 1–2. Note that compensation capacitors C3 and C6 are not installed. Figure 1–2. THS4012 EVM Schematic — Noninverting Operation C1 6.8 µ F –VCC 1 GND 2 +VC[...]

  • Page 11

    THS4012 EVM Noninverting Operation 1-5 General Any of the resistors 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 board are somewhat fragile and will not survive many desoldering/soldering operations. External factors can significantly affect the ef f[...]

  • Page 12

    Using the THS4012 EVM In The Noninverting Mode 1-6 General 1.4 Using the THS4012 EVM In The Noninverting Mode The THS4012 EVM operates from power-supply voltages ranging from ± 5 V to ± 15 V . As shipped, the EVM is configured for inverting operation and the gain is set to 4. Signal inputs on the module are terminated for 50- Ω nominal source i[...]

  • Page 13

    THS4012 EVM Inverting Operation 1-7 General 1.5 THS4012 EVM Inverting Operation Although the THS4012 EVM is shipped preconfigured for dual-channel noninverting operation, it can be reconfigured for inverting operation by making the following component changes: 1) Move resistor R3 to the R2 location and R5 to the R4 location on the board. 2) Move re[...]

  • Page 14

    THS4012 EVM Inverting Operation 1-8 General The gain of the EVM 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: Inverting Gain –R F R G –R 6 R 4 and –R 14 R 12 In addition, some applications, such as those for[...]

  • Page 15

    Using the THS4012 EVM In The Inverting Mode 1-9 General 1.6 Using the THS4012 EVM In The Inverting Mode The THS4012 EVM operates from power-supply voltages ranging from ± 5 V to ± 15 V . As shipped, the EVM is configured for inverting operation. Move the resistors as detailed above to configure the EVM for noninverting operation, which sets the g[...]

  • Page 16

    THS4012 EVM Differential Input 1-10 General 1.7 THS4012 EVM Differential Input The THS4012 EVM is shipped preconfigured for dual-channel, single-ended noninverting operation. It can be reconfigured for single-channel, differential operation, either noninverting or inverting. 1.7.1 Differential Input, Noninverting Operation Configure the THS4012 EVM[...]

  • Page 17

    THS4012 EVM Differential Input 1-1 1 General The gain of the EVM can easily be changed to support a particular application by simply changing the ratio of resistors R6 and R5 (channel 1) and R14 and R13 (channel 2) as described in the following equation: Noninverting Gain 1 R F R G 1 R 6 R 5 and 1 R 14 R 13 In addition, some applications, such as t[...]

  • Page 18

    THS4012 EVM Differential Input 1-12 General Figure 1–5. THS4012 EVM Schematic — Differential Input (Inverting Operation) C1 6.8 µ F –VCC 1 GND 2 +VCC 3 J2 C2 6.8 µ F –VCC +VCC – + U1:A THS4012 1 4 8 2 3 R4 1 k Ω R6 1 k Ω +VCC C3 x µ F R7 49.9 Ω V out1 J3 C4 0.1 µ F –VCC R2 0 Ω J1 Vin1 R8 100 Ω – + U1:B THS4012 7 6 5 R12 [...]

  • Page 19

    THS4012 EVM Differential Input 1-13 General 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 board are somewhat fragile and will not survive many desoldering/soldering operations. External factors can significantly affect the ef fective gain[...]

  • Page 20

    Using the THS4012 EVM With Differential Inputs 1-14 General 1.8 Using the THS4012 EVM With Differential Inputs The THS4012 EVM operates from power-supply voltages ranging from ± 5 V to ± 15 V . Move resistors on the board as detailed above for either noninverting or inverting operation to configure the EVM for differential input operation. Signal[...]

  • Page 21

    THS4012 EVM Performance 1-15 General 1.10 THS4012 EVM Performance Figure 1–6 shows the typical frequency response of the THS4012 EVM using the noninverting configuration (G = 2). T ypical – 0.1 dB bandwidth is 25 MHz and – 3-dB bandwidth is 75 MHz with both a ± 15-V power supply and a ± 5-V power supply . Figure 1–6. THS4012 EVM Frequency[...]

  • Page 22

    General High-Speed Amplifier Design Considerations 1-16 General 1.1 1 General High-Speed Amplifier Design Considerations The THS4012 EVM layout has been designed and optimized for use with high-speed signals and can be used as an example when designing THS4012 applications. Careful attention has been given to component selection, grounding, power s[...]

  • Page 23

    General PowerP AD Design Considerations 1-17 General 1.12 General PowerP AD Design Considerations The THS4012DGN IC is mounted in a special package incorporating a thermal pad that transfers heat from the IC die directly to the PCB. The PowerP AD package is constructed using a downset leadframe. The die is mounted on the leadframe but is electrical[...]

  • Page 24

    General PowerP AD Design Considerations 1-18 General 8) With these preparatory steps in place, the THS4012DGN IC is simply placed in position and run through the solder reflow operation as any standard surface-mount component. This results in a part that is properly installed. The actual thermal performance achieved with the THS4012DGN in its Power[...]

  • Page 25

    General PowerP AD Design Considerations 1-19 General Correct PCB layout and manufacturing techniques are critical for achieving adequate transfer of heat away from the PowerP AD 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 the P[...]

  • Page 26

    1-20 General[...]

  • Page 27

    2-1 Reference Reference This chapter includes a complete schematic, parts list, and PCB layout illustrations for the THS4012 EVM. T opic 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 [...]

  • Page 28

    THS4012 EVM Complete Schematic 2-2 Reference 2.1 THS4012 EVM Complete Schematic Figure 2–1 shows the complete THS4012 EVM schematic. The EVM is shipped preconfigured for dual-channel, single-ended inverting operation. Components showing a value of X are not supplied on the board, but can be installed by the user to reconfigure the EVM for noninve[...]

  • Page 29

    THS4012 Dual High-Speed Operational Amplifier EVM Parts List 2-3 Reference 2.2 THS4012 Dual High-Speed Operational Amplifier EVM Parts List T able 2–1. THS4012 EVM Parts List Reference Description Size Manufacturer/Supplier Part Number C1, C2 Capacitor , 6.8 µ F , 35 V , T antalum, SM Sprague 293D685X9035D2T C4, C5 Capacitor , 0.1 µ F , Ceramic[...]

  • Page 30

    THS4012 EVM Board Layouts 2-4 Reference 2.3 THS4012 EVM Board Layouts Board layout examples of the THS4012 EVM PCB are shown 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 V out1 SLOP230 THS4012 EV[...]

  • 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[...]