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BUF634 Datasheet(PDF) 9 Page - Burr-Brown (TI) |
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BUF634 Datasheet(HTML) 9 Page - Burr-Brown (TI) |
9 / 11 page ® BUF634 9 HIGH FREQUENCY APPLICATIONS The BUF634’s excellent bandwidth and fast slew rate make it useful in a variety of high frequency open-loop applications. When operated open-loop, circuit board layout and bypassing technique can affect dynamic performance. For best results, use a ground plane type circuit board layout and bypass the power supplies with 0.1 µF ceramic chip capacitors at the device pins in parallel with solid tantalum 10 µF capacitors. Source resistance will affect high-frequency peaking and step response overshoot and ringing. Best response is usually achieved with a series input resistor of 25 Ω to 200Ω, depending on the signal source. Response with some loads (especially capacitive) can be improved with a resistor of 10 Ω to 150Ω in series with the output. OP AMP RECOMMENDATIONS OPA177, OPA1013 Use Low IQ mode. G = 1 stable. OPA111, OPA2111 OPA121, OPA234(1), OPA130(1) OPA27, OPA2107 Low IQ mode is stable. Increasing CL may cause OPA602, OPA131(1) excessive ringing or instability. Use Wide BW mode. OPA627, OPA132(1) Use Wide BW mode, C1 = 200pF. G = 1 stable. OPA637, OPA37 Use Wide BW mode. These op amps are not G = 1 stable. Use in G > 4. NOTE: (1) Single, dual, and quad versions. OPA NOTE: (1) C 1 not required for most common op amps. Use with unity-gain stable high speed op amps. V IN V O V+ V– BUF634 C 1 (1) Wide BW mode (if required) BW FIGURE 5. High Performance Headphone Driver. FIGURE 8. Bridge-Connected Motor Driver. 1/2 OPA2234 9k Ω BUF634 1k Ω V IN ±1V Motor 1/2 OPA2234 BUF634 10k Ω 10k Ω ±20V at 250mA FIGURE 7. Current-Output Valve Driver. OPA177 BUF634 Valve V IN ±2V 10 Ω I O = ±200mA FIGURE 4. Boosting Op Amp Output Current. C(1) C(1) pseudo ground + 12V – BUF634 10k Ω 10µF +24V 10k Ω + 12V – NOTE: (1) System bypass capacitors. + FIGURE 6. Pseudo-Ground Driver. OPA132 Drives headphones or small speakers. 5k Ω BUF634 100k Ω 1µF R L = 100Ω f 1kHz 20kHz THD+N 0.015% 0.02% 250 Ω G = +21 V IN V– BW V+ |
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