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OPA1641AID Datasheet(PDF) 10 Page - Texas Instruments |
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OPA1641AID Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 21 page  100k 1M SourceResistance,R (W) S 100 1k 10k 10k 1k 100 10 1 R S E O E =e O n n S S +(i R ) +4kTR 2 2 2 ResistorNoise OPA1611 OPA1641 OPA1641 OPA1642 OPA1644 SBOS484 – DECEMBER 2009 www.ti.com APPLICATION INFORMATION The OPA1641, OPA1642, and OPA1644 are The equation in Figure 31 shows the calculation of unity-gain stable, audio operational amplifiers with the total circuit noise, with these parameters: very low noise, input bias current, and input offset • en = voltage noise voltage. Applications with noisy or high-impedance • In = current noise power supplies require decoupling capacitors placed • RS = source impedance close to the device pins. In most cases, 0.1 μF • k = Boltzmann's constant = 1.38 × 10–23 J/K capacitors are adequate. The front-page drawing shows a simplified schematic of the OPA1641. • T = temperature in degrees Kelvin (K) For more details on calculating noise, see the next OPERATING VOLTAGE section on Basic Noise Calculations. The OPA1641, OPA1642, and OPA1644 series of op amps can be used with single or dual supplies from an operating range of VS = +4.5V (±2.25V) and up to VS = +36V (±18V). These devices do not require symmetrical supplies; it only requires a minimum supply voltage of +4.5V (±2.25V). For VS less than ±3.5V, the common-mode input range does not include midsupply. Supply voltages higher than +40V can permanently damage the device; see Absolute Maximum Ratings table. Key parameters are specified over the operating temperature range, TA = –40°C to +85°C. Key parameters that vary over the supply voltage or temperature range are shown in the Typical Characteristics section of this data sheet. NOISE PERFORMANCE Figure 31 shows the total circuit noise for varying Figure 31. Noise Performance of the OPA1611 source impedances with the operational amplifier in a and OPA1641 in Unity-Gain Buffer Configuration unity-gain configuration (with no feedback resistor network and therefore no additional noise contributions). The OPA1641, OPA1642, and BASIC NOISE CALCULATIONS OPA1644 are shown with total circuit noise Low-noise circuit design requires careful analysis of calculated. The op amp itself contributes both a all noise sources. External noise sources can voltage noise component and a current noise dominate in many cases; consider the effect of component. The voltage noise is commonly modeled source resistance on overall op amp noise as a time-varying component of the offset voltage. performance. Total noise of the circuit is the The current noise is modeled as the time-varying root-sum-square combination of all noise component of the input bias current and reacts with components. the source resistance to create a voltage component of noise. Therefore, the lowest noise op amp for a The resistive portion of the source impedance given application depends on the source impedance. produces thermal noise proportional to the square For low source impedance, current noise is negligible, root of the resistance. This function is plotted in and voltage noise generally dominates. The Figure 31. The source impedance is usually fixed; OPA1641, OPA1642, and OPA1644 family has both consequently, select the op amp and the feedback low voltage noise and extremely low current noise resistors to minimize the respective contributions to because of the FET input of the op amp. As a result, the total noise. the current noise contribution of the OPA164x series is negligible for any practical source impedance, which makes it the better choice for applications with high source impedance. 10 Copyright © 2009, Texas Instruments Incorporated Product Folder Link(s): OPA1641 OPA1642 OPA1644 |
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