THS3062EVM User’s Guide September 2002 High Performance Linear Products SLOU146
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.
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.
EVM WARNINGS AND RESTRICTIONS It is important to operate this EVM within the specified input and output ranges described in the EVM user’s guide. The input supply voltage must not exceed ±15 V for dual supply or 30 V for single supply. The differential input signal must not exceed ±3 V. The output current must not exceed 150 mA. Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM.
Information About Cautions and Warnings Preface Read This First How to Use This Manual This document contains the following chapters: - Chapter 1—Introduction and Description - Chapter 2—Using The THS3062EVM - Chapter 3—THS3062EVM Applications - Chapter 4—EVM Hardware Description Information About Cautions and Warnings This book may contain cautions and warnings. This is an example of a caution statement.
Trademarks FCC Warning This equipment is intended for use in a laboratory test environment 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 are designed to provide reasonable protection against radio frequency interference.
Contents Contents 1 Introduction and Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.1 Evaluation Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 2 Using the THS3062EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 3 THS3062EVM Applications . . . . . . . . . . . . . . . . . . . . . .
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Chapter 1 Introduction and Description This chapter provides a description of the THS3062EVM dual high-speed operational amplifier along with a schematic diagram. 1.1 Evaluation Schematic As delivered, the EVM has a fully functional example circuit, requiring added power supplies, a signal source, and a monitoring instrument. The default schematic diagram is provided in Figure 1-1.
Evaluation Schematic The noninverting gain of the EVM channel 1 amplifier, when using the default configuration, is affected by the same slight gain error plus the gain error imposed by the inverting input termination resistor, R2. The following equation shows the gain for this situation: V ǒ O+ 1) R6 V R1 ) R2 I ø 50 W Ǔ ǒR4 R4 Ǔ + 0.908 ø 50 W ) R5 (2) EVM Channel 2: The default configuration for EVM channel 2 provides for a voltage gain of +1.
Evaluation Schematic Figure 1-1. Schematic of the THS3062EVM J9 J7 FB2 FB1 -VS +VS + -VS(IN) C5 22 mF + +VS(IN) GND J8 TP1 TP2 C6 22 mF R6 562 W +VS C10 100 pF 2 3 R2 54.9 W R5 J1 V1out 49.9 W 4 R3 49.9 W J3 V1in+ U1A 8 THS3062 1 + R1 562 W - J2 V1in- C8 0.1 mF C9 100 pF C7 0.1 mF R4 953 W -VS R7 750 W U1B 6 5 R9 * R10 49.9 W J5 V2in+ + R8 * - J4 V2in- 7 R11 J6 V2out 49.
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Chapter 2 Using the THS3062EVM This chapter shows how to connect the THS3062EVM to test equipment. It is recommended that the user connect the EVM as described in this chapter to avoid damage to the EVM or the THS3062 installed on the board. Figure 2.1 shows how to connect power supplies, a 50-Ω signal source, and a 50-Ω monitoring instrument. Figure 2-1.
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Chapter 3 THS3062EVM Applications Example applications are presented in this chapter. These applications demonstrate the most popular circuits to the user, but many other circuits can be constructed. The user is encouraged to experiment with different circuits, exploring new and creative design techniques. 3.1 Inverting Gain Stage The circuit described in chapter 2 is an inverting gain stage with a voltage divider on the output.
Noninverting Gain Stage 3.2 Noninverting Gain Stage For a noninverting stage in EVM channel 1, the EVM can be modified to eliminate the gain error imposed by R2 by replacing R2 with a 0-Ω resistor. This is shown in Figure 3-2. R4 has been removed as shown in the inverting gain stage example above. The following equation indicates the voltage gain from J3 to J1: ǒ V W Ǔ+1 Ǔ ǒ50 50 W ) R5 O + 1 ) R6 V R1 I (5) Figure 3-2.
Chapter 4 EVM Hardware Description This chapter describes the EVM hardware. It includes the EVM parts list, component placement diagram, and printed-circuit board layout. Table 4-1.
Figure 4-1. Top Layer 1 (Signals and Silkscreen) for THS3062EVM Figure 4-2.
Figure 4-3. Internal Plane (Layer 3) Power Layer Figure 4-4.
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