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LMV358 Datasheet(PDF) 19 Page - Texas Instruments |
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LMV358 Datasheet(HTML) 19 Page - Texas Instruments |
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19 / 50 page  OUT OUT cm REF V V 1 V V 2 2 + - + æ ö = = ç ÷ è ø 2 4 2 D IF F O U T O U T IN R E F 1 3 4 1 R R R V V V V 1 V 1 R R R R + - æ ö æ ö æ ö = - = ´ + - ´ + ç ÷ ç ÷ ç ÷ + è ø è ø è ø 4 2 2 out ref in 3 4 1 1 R R R V V 1 V R R R R - æ ö æ ö = ´ ´ + - ´ ç ÷ ç ÷ + è ø è ø OUT REF 4 3 4 2 1 1 2 + IN LMV358, LMV321, LMV324, LMV324S www.ti.com SLOS263W – AUGUST 1999 – REVISED OCTOBER 2014 Typical Application (continued) 9.1.1 Design Requirements The design requirements are as follows: • Supply voltage: 2.7 V • Reference voltage: 2.5 V • Input: 0.5 to 2 V • Output differential: ±1.5 V 9.1.2 Detailed Design Procedure The circuit in Figure 46 takes a single-ended input signal, VIN, and generates two output signals, VOUT+ and VOUT– using two amplifiers and a reference voltage, VREF. VOUT+ is the output of the first amplifier and is a buffered version of the input signal, VIN (see Equation 1). VOUT– is the output of the second amplifier which uses VREF to add an offset voltage to VIN and feedback to add inverting gain. The transfer function for VOUT– is Equation 2. VOUT+ = VIN (1) (2) The differential output signal, VDIFF, is the difference between the two single-ended output signals, VOUT+ and VOUT–. Equation 3 shows the transfer function for VDIFF. By applying the conditions that R1 = R2 and R3 = R4, the transfer function is simplified into Equation 6. Using this configuration, the maximum input signal is equal to the reference voltage and the maximum output of each amplifier is equal to the VREF. The differential output range is 2×VREF. Furthermore, the common mode voltage will be one half of VREF (see Equation 7). (3) VOUT+ = VIN (4) VOUT– = VREF – VIN (5) VDIFF = 2×VIN – VREF (6) (7) 9.1.2.1 Amplifier Selection Linearity over the input range is key for good dc accuracy. The common mode input range and the output swing limitations determine the linearity. In general, an amplifier with rail-to-rail input and output swing is required. Bandwidth is a key concern for this design. Because LMV358 has a bandwidth of 1 MHz, this circuit will only be able to process signals with frequencies of less than 1 MHz. 9.1.2.2 Passive Component Selection Because the transfer function of VOUT– is heavily reliant on resistors (R1, R2, R3, and R4), use resistors with low tolerances to maximize performance and minimize error. This design used resistors with resistance values of 36 k Ω with tolerances measured to be within 2%. If the noise of the system is a key parameter, the user can select smaller resistance values (6 k Ω or lower) to keep the overall system noise low. This ensures that the noise from the resistors is lower than the amplifier noise. Copyright © 1999–2014, Texas Instruments Incorporated Submit Documentation Feedback 19 Product Folder Links: LMV358 LMV321 LMV324 LMV324S |
Similar Part No. - LMV358_16 |
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Similar Description - LMV358_16 |
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