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OPA2134UA Datasheet(PDF) 8 Page - Burr-Brown (TI) |
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OPA2134UA Datasheet(HTML) 8 Page - Burr-Brown (TI) |
8 / 14 page 8 ® OPA134/2134/4134 APPLICATIONS INFORMATION OPA134 series op amps are unity-gain stable and suitable for a wide range of audio and general-purpose applications. All circuitry is completely independent in the dual version, assuring normal behavior when one amplifier in a package is overdriven or short-circuited. Power supply pins should be bypassed with 10nF ceramic capacitors or larger to minimize power supply noise. OPERATING VOLTAGE OPA134 series op amps operate with power supplies from ±2.5V to ±18V with excellent performance. Although specifications are production tested with ±15V supplies, most behavior remains unchanged throughout the full operating voltage range. Parameters which vary signifi- cantly with operating voltage are shown in the typical performance curves. OFFSET VOLTAGE TRIM Offset voltage of OPA134 series amplifiers is laser trimmed and usually requires no user adjustment. The OPA134 (single op amp version) provides offset trim connections on pins 1 and 8, identical to 5534 amplifiers. Offset voltage can be adjusted by connecting a potentiometer as shown in Figure 1. This adjustment should be used only to null the offset of the op amp, not to adjust system offset or offset produced by the signal source. Nulling offset could change the offset voltage drift behavior of the op amp. While it is not possible to predict the exact change in drift, the effect is usually small. TOTAL HARMONIC DISTORTION OPA134 series op amps have excellent distortion character- istics. THD+Noise is below 0.0004% throughout the audio frequency range, 20Hz to 20kHz, with a 2k Ω load. In addition, distortion remains relatively flat through its wide output voltage swing range, providing increased head- room compared to other audio amplifiers, including the OP176/275. FIGURE 1. OPA134 Offset Voltage Trim Circuit. V+ V– 100k Ω OPA134 single op amp only. Use offset adjust pins only to null offset voltage of op amp—see text. Trim Range: ±4mV typ OPA134 6 7 8 4 3 2 1 10nF 10nF In many ways headroom is a subjective measurement. It can be thought of as the maximum output amplitude allowed while still maintaining a very low level of distortion. In an attempt to quantify headroom, we have defined “very low distortion” as 0.01%. Headroom is expressed as a ratio which compares the maximum allowable output voltage level to a standard output level (1mW into 600 Ω, or 0.7746Vrms). Therefore, OPA134 series op amps, which have a maximum allowable output voltage level of 11.7Vrms (THD+Noise < 0.01%), have a headroom specification of 23.6dBu. See the typical curve “Headroom - Total Harmonic Distortion + Noise vs Output Amplitude.” DISTORTION MEASUREMENTS The distortion produced by OPA134 series op amps is below the measurement limit of all known commercially available equipment. However, a special test circuit can be used to extend the measurement capabilities. Op amp distortion can be considered an internal error source which can be referred to the input. Figure 2 shows a circuit which causes the op amp distortion to be 101 times greater than normally produced by the op amp. The addition of R3 to the otherwise standard non-inverting amplifier FIGURE 2. Distortion Test Circuit. R 2 OPA134 R 1 Signal Gain = 1+ Distortion Gain = 1+ R 3 V O = 3Vrms Generator Output Analyzer Input Audio Precision System One Analyzer(1) R L 1k Ω IBM PC or Compatible SIG. GAIN DIST. GAIN R 1 R 2 R 3 ∞ 100 Ω 10 Ω 1k Ω 1k Ω 1k Ω 10 Ω 11 Ω ∞ 1 11 101 101 101 101 NOTE: (1) Measurement BW = 80kHz R 2 R 1 R 2 R 1 II R3 |
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