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Summary of Contents for Texas Instruments THS4601EVM
- Page 1 THS4601EVM User’s Guide October 2002 High Performance Linear Products SLOU150...
- Page 2 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.
- Page 3 EVM IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety measures typically found in the end product incorporating the goods.
- Page 4 EVM schematic located in the EVM User’s Guide. When placing measurement probes near these devices during operation, please be aware that these devices may be very warm to the touch. Mailing Address: Texas Instruments Post Office Box 655303 Dallas, Texas 75265 Copyright 2002, Texas Instruments Incorporated...
- Page 5 Information About Cautions and Warnings Preface Read This First Information About Cautions and Warnings This book may contain cautions and warnings. This is an example of a caution statement. A caution statement describes a situation that could potentially damage your software or equipment. This is an example of a warning statement.
- Page 6 Enhanced Package, http://www-s.ti.com/sc/psheets/slma004/slma002.pdf Application report (literature number SLMA004), Power Pad Made Easy, http://www-s.ti.com/sc/psheets/slma004/slma004.pdf Application report (literature number SSYA008), Electrostatic Discharge (ESD), http://www-s.ti.com/sc/psheets/ssya008/ssya008.pdf Application report (literature number SLOA102), High Speed PCB Layout Tips, http://www-s.ti.com/sc/psheets/sloa102/sloa102.pdf Trademarks PowerPAD is a trademark of Texas Instruments.
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Page 7: Table Of Contents
Contents Contents Introduction and Description ........... . Evaluation Schematic . - Page 8 Figures Schematic of the THS4601EVM ..........
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Page 9: Introduction And Description
Chapter 1 Introduction and Description This EVM provides a platform for testing the THS4601 in 8-pin SOIC PowerPADt (DDA) package. It contains the high-speed op amp, a number of passive components, and various features and footprints that enable the user to experiment, test, and verify various operational amplifier circuit implementations. -
Page 10: Evaluation Schematic
Evaluation Schematic 1.1 Evaluation Schematic As delivered, the EVM has a fully functional example circuit—just add power supplies, a signal source, and monitoring instrument. See Figure 1-1 for a complete schematic diagram. EVM features include: Wide operating supply voltage range: ±5 V to ±15 V operation (see the device data sheet) Inverting and noninverting gain configurations supported Single supply capability—R5 through R7 to provide internal or external... -
Page 11: Schematic Of The Ths4601Evm
Evaluation Schematic Figure 1-1. Schematic of the THS4601EVM 100 Ω Z1 0 Ω 100 Ω Vin- Vout Vref 49.9 Ω Vout Vin+ 0 Ω THS4601 49.9 Ω 1 kΩ 22 µF 22 µF 0.1 µF 1000 pF 100 pF 100 pF 1000 pF 0.1 µF... -
Page 12: Using The Evm
Chapter 2 Using the EVM Figure 2-1 shows how to connect power supplies, signal source and monitor- ing instrument. It is recommended that the user connect the EVM as shown to avoid damage to the EVM or the op amp installed on the board. Figure 2-1. -
Page 13: Evm Applications
1 kΩ *Power supply decoupling is not shown Note: This schematic reflects the default THS4601EVM configuration. The gain measured from J2 to J3 is 2 when measured with a high impedance instrument at TP3 or J3, as determined by: V out + 1 ) Z5 The user might note that R3 and Z5 appear to be rather small resistances. -
Page 14: Ac-Coupled, Single Power Supply, Noninverting Gain Stage
Noninverting Gain Stages Figure 3-2. AC-Coupled, Single Power Supply, Noninverting Gain Stage 100 Ω 100 Ω Ω Vout Vref Vout Vin+ THS4601 49.9 Ω 1 kΩ *Power supply decoupling is not shown Z1 through Z3 are populated with dc-blocking capacitors, selected so they do not interfere with the frequencies that are of interest. -
Page 15: Inverting Gain Stages
Inverting Gain Stages 3.2 Inverting Gain Stages Figure 3-3. DC-Coupled, Dual Power Supply, Inverting Gain Stage Vin- Z1 0 W 100 W 100 W 61.9 W Vout Vout 49.9 W Z2 0 W THS4601 1 k W *Power supply decoupling is not shown The Gain measured from J1 to J3 is 1, as determined by: V out + * Z5... -
Page 16: Transimpedance Amplifier
Transimpedance Amplifier prefers, an external potential can be introduced at J7, and use only resistors R7 and R5. If the source of VS+ in the system is noisy, and there is a less noisy potential available in the system, it can be connected to J7. R7 and R5 can then be used as a voltage divider off the reference attached to J7 to create the VS+ divided-by-2 potential. -
Page 17: Wideband Photodiode Transimpedance Amplifier
Transimpedance Amplifier signal also places requirements on the amplifier’s dynamic range. Knowledge of the source’s output current levels, coupled with a desired voltage swing on the output, dictates the value of the feedback resistor, R4. The transfer function from input to output is V The large gain-bandwidth product of the THS4601 provides the capability for achieving both high transimpedance gain and wide bandwidth simultaneously. -
Page 18: Parasitic Capacitances In Photodiode Applications
Transimpedance Amplifier p(R4)GBP p(R4)GBP p(R4)GBP Z5 + Once the optimal feedback capacitor has been selected, the transimpedance bandwidth can be calculated: –3dB ) Z5 2p(R4) C The total source capacitance C is the sum of several distinct capacitances as shown in Figure 3-6. Figure 3-6. -
Page 19: Transimpedance Circuit Bode Plot
Transimpedance Amplifier Figure 3-7. Transimpedance Circuit Bode Plot Gain -20 dB/ 20 dB/Decade Decade Rate-of-Closure Noise Gain 20 dB/ Decade Zero Pole The performance of the THS4601 has been measured for a variety of transimpedance gains with a variety of source capacitances. The achievable bandwidths of the various circuit configurations are summarized numerically in the data sheet, SLOS388. -
Page 20: T-Network Gain Stages
T-Network Gain Stages Figure 3-8. Transimpedance Gains 10 kΩ TRANSIMPEDANCE BANDWIDTH 100 kΩ TRANSIMPEDANCE BANDWIDTH FOR VARIOUS SOURCE CAPACITANCES FOR VARIOUS SOURCE CAPACITANCES = 18 pF, = 0.6 pF = 18 pF, C = 2.2 pF = 47 pF, = 0.6 pF = 47 pF, = 3.3 pF = 100 pF,... -
Page 21: Simplified Evm Schematic For Inverting Gain
T-Network Gain Stages Figure 3-9. Simplified EVM Schematic for Inverting Gain Vin- Vout THS4601 The following assumes that Z4 and Z6 are resistors. Gain for the T-network stage is defined by the expression: V out + – R4 ) Z4 ) Z4 Looking at the expression above, the gain of the circuit is the standard inverting gain (the first term), modified by the second term. -
Page 22: Transimpedance Networks
Transimpedance Networks Figure 3-10. Simplified EVM Schematic for Noninverting Gain Vout THS4601 Vin+ 3.5 Transimpedance Networks The components R4, and Z4 through Z6 can be used to form several transimpedance networks. Transimpedance networks are used to implement custom filter responses based on the location of poles and zeros. Pole / zero filter design is beyond the scope of this EVM manual. -
Page 23: Single Real Poles, And Single Real Zero (Second Configuration)
Transimpedance Networks Figure 3-13. Single Real Pole and Single Real Zero (Second Configuration) Imag Real Iout Figure 3-14. Two Real Poles, One Real Zero Imag Real Iout Figure 3-15. One Real Pole, Two Complex Zeros Imag Real Iout EVM Applications 3-11... -
Page 24: Evm Hardware Description
Chapter 4 EVM Hardware Description Table 4-1. THS4601EVM Bill of Materials Item Description Reference Manfacturer’s Distributor’s Size Desginator Qty. Part No. Part No. Bead, ferrite, 3A, 80 Ω 1206 FB1, FB2 (Steward) (Digi-Key) HI1206N800R-00 240-010-1-ND Capacitor, 22 µf, tantalum, C3, C6... -
Page 25: Board Layout Views
Figure 4-1. Board Layout Views Bottom... - Page 26 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Texas Instruments THS4601EVM...
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