THS3061EVM User’s Guide September 2002 High Performance Linear Products SLOU145
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 ( VS) should be no greater than 15 V for dual supply or 30 V for single supply. The differential input signal (VID) should be no greater than 3 V. The output current (IO) should be no greater than 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 THS3061EVM - Chapter 3—THS3061EVM 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 THS3061EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 3 THS3061EVM Applications . . . . . . . . . . . . . . . . . . . .
Chapter 1 Introduction and Description The Texas Instruments THS3061 evaluation module (EVM) helps designers evaluate the performance of the THS3061 operational amplifier. Also, this EVM is a good example of high-speed PCB design. This document details the THS3061EVM.
Evaluation Schematic When used as an inverting amplifier in the default configuration connected to a 50-Ω input measurement instrument, R7 causes a slight gain error. The total voltage gain is the negative ratio of the feedback resistor R5 and the gain resistor R3, times the voltage divider created by R6-R7, and the measurement device input termination resistance. This gain follows the equation: V O + – R5 R3 V I ǒ Ǔ R7 ø 50 W + –0.
Chapter 2 Using the THS3061 EVM This section shows how to connect the THS3061EVM to test equipment. It is recommended that the user connect the EVM as shown in this section to avoid damage to the EVM or the THS3061 installed on the board. Figure 2-1. THS3061EVM Interconnection Diagram Figure 2-1 shows the connections to measure the output while a signal is inserted into EVM’s noninverting input. For an inverting signal path, the signal source can be connected to J1 instead.
Chapter 3 THS3061EVM Applications Example applications are presented in this chapter. These applications demonstrate the most popular circuits, but many other circuits can be constructed. The purpose of the EVM board is for the user to experiment with different circuits, exploring new and creative design techniques, which is the function of an evaluation board. 3.1 Inverting Gain Stage The circuit described in Chapter 1 is an inverting gain stage with a voltage divider on the output.
Noninverting Gain Stage 3.2 Noninverting Gain Stage 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. R7 has been removed, as it was in the inverting gain stage shown above. The following equation indicates the voltage gain from J2 to J4: V ǒ W Ǔ+1 Ǔ ǒ50 50 W ) R6 O + 1 ) R5 R3 V I (2) Figure 3-2. Noninverting Gain Stage R5 Vs+ R3 562 W R2 0 J2 Vin+ 2 3 562 W 7 U1 THS3061 6 + R6 49.9 J4 Vout 4 VsR4 49.
Chapter 4 EVM Hardware Description This chapter describes the EVM hardware. It includes the EVM parts list, and printed circuit board layout. Table 4-1.
Figure 4-1.
