Electronic Components Datasheet Search |
|
OPA376AIDCKRG4 Datasheet(PDF) 11 Page - Burr-Brown (TI) |
|
|
OPA376AIDCKRG4 Datasheet(HTML) 11 Page - Burr-Brown (TI) |
11 / 23 page www.ti.com CAPACITIVE LOAD AND STABILITY ACTIVE FILTERING C 1 1nF C 150pF 2 R 3 5.49kW R 1 5.49kW R 2 12.4kW V+ V OUT V IN OPA376 (V+)/2 DRIVING AN ANALOG-TO-DIGITAL 10 to W 20W V+ V IN V OUT R S R L C L OPA376 OPA376 OPA2376 OPA4376 SBOS406B – JUNE 2007 – REVISED SEPTEMBER 2007 The OPA376 series of amplifiers may be used in The OPA376 series is well-suited for filter applications where driving a capacitive load is applications requiring a wide bandwidth, fast slew required. As with all op amps, there may be specific rate, low-noise, single-supply operational amplifier. instances where the OPAx376 can become unstable, Figure 26 shows a 50kHz, 2nd-order, low-pass filter. leading to oscillation. The particular op amp circuit The components have been selected to provide a configuration, layout, gain and output loading are maximally-flat Butterworth response. Beyond the some of the factors to consider when establishing cutoff frequency, roll-off is –40dB/dec. The whether an amplifier will be stable in operation. An op Butterworth response is ideal for applications amp in the unity-gain (+1V/V) buffer configuration and requiring predictable gain characteristics such as the driving a capacitive load exhibits a greater tendency anti-aliasing filter used ahead of an analog-to-digital to be unstable than an amplifier operated at a higher converter (ADC). noise gain. The capacitive load, in conjunction with the op amp output resistance, creates a pole within the feedback loop that degrades the phase margin. The degradation of the phase margin increases as the capacitive loading increases. The OPAx376 in a unity-gain configuration can directly drive up to 250pF pure capacitive load. Increasing the gain enhances the ability of the amplifier to drive greater capacitive loads (see the typical characteristic plot, Small-Signal Overshoot vs Capacitive Load. In unity-gain configurations, capacitive load drive can be improved by inserting a small (10 Ω to 20Ω) resistor, RS, in series with the output, as shown in Figure 25. This resistor significantly reduces ringing while maintaining dc performance for purely capacitive loads. However, if there is a resistive load in parallel with the capacitive load, a voltage divider is created, introducing a gain error at the output and slightly reducing the output swing. The error introduced is proportional to the ratio Figure 26. Second-Order Butterworth 50kHz Low-Pass Filter RS/RL, and is generally negligible at low output current levels. CONVERTER The low noise and wide gain bandwidth of the OPA376 family make it an ideal driver for ADCs. Figure 27 illustrates the OPA376 driving an ADS8327, 16-bit, 250kSPS converter. The amplifier is connected as a unity-gain, noninverting buffer. Figure 25. Improving Capacitive Load Drive Copyright © 2007, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): OPA376 OPA2376 OPA4376 |
Similar Part No. - OPA376AIDCKRG4 |
|
Similar Description - OPA376AIDCKRG4 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |