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OPA734 Datasheet(PDF) 9 Page - Texas Instruments |
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OPA734 Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 18 page  OPA734, OPA2734 OPA735, OPA2735 SBOS282A − DECEMBER 2003 − REVISED FEBRUARY 2004 www.ti.com 9 Low-gain (< 20) operation demands that the auto-zero circuitry correct for common-mode rejection errors of the main amplifier. Because these errors can be larger than 0.1% of a full-scale input step change, one calibration cycle (100 µs) can be required to achieve full accuracy. The term clock feedthrough describes the presence of the clock frequency in the output spectrum. In auto-zeroed op amps, clock feedthrough may result from the settling of the internal sampling capacitor, or from the small amount of charge injection that occurs during the sample-and-hold of the op amp offset voltage. Feedthrough can be minimized by keeping the source impedance relatively low (< 1k Ω) and matching the source impedance on both input terminals. If the source resistance is high (> 1k Ω) feedthrough can generally be reduced with a capacitor of 1nF or greater in parallel with the source or feedback resistors. See the circuit application examples. LAYOUT GUIDELINES Attention to good layout practices is always recom- mended. Keep traces short. When possible, use a PCB ground plane with surface-mount components placed as close to the device pins as possible. Place a 0.1 µF capacitor closely across the supply pins. These guidelines should be applied throughout the analog circuit to improve performance and provide benefits such as reducing the electromagnetic-interference (EMI) susceptibility. R 1 V EX V OUT V REF R 1 OPA734 R R RR +10V 1nF 1nF Figure 2. Single Op Amp Bridge Amplifier Circuit 1/2 OP A 2735 R 3 10k Ω R 3 10k Ω R 1 1k Ω 1/2 OP A 2735 R 2 1k Ω C 4 1nF C 4 1nF R G 10V C 1 (1) 1nF C 2 (1) 10nF C 3 (1) 1nF V REF = 15V 2 4 6 REF102 NOTE: (1) Place close to input pins. R R RR G= 1 + 2 R 3 R G Figure 3. Differential Output Bridge Amplifier |
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Similar Description - OPA734 |
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