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OPA301AID Datasheet(PDF) 11 Page - Texas Instruments |
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OPA301AID Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 27 page  OPA300, OPA2300 OPA301, OPA2301 SBOS271D − MAY 2003 − REVISED JUNE 2007 www.ti.com 11 DRIVING CAPACITIVE LOADS When using high-speed operational amplifiers, it is extremely important to consider the effects of capacitive loading on amplifier stability. Capacitive loading will interact with the output impedance of the operational amplifier, and depending on the capacitor value, may significantly decrease the gain bandwidth, as well as introduce peaking. To reduce the effects of capacitive loading and allow for additional capacitive load drive, place a series resistor between the output and the load. This will reduce available bandwidth, but permit stable operation with capacitive loading. Figure 3 illustrates the recommended relationship between the resistor and capacitor values. Capacitive Load (pF) 1 10 100 100 75 50 25 0 Figure 3. Recommended RS and CL Combinations Amplifiers configured in unity gain are most susceptible to stability issues. The typical characteristic, Frequency Response vs Capacitive Load, describes the relation- ship between capacitive load and stability for the OPA300/OPA301 series. In unity gain, the OPA300/OPA301 series is capable of driving a few picofarads of capacitive load without compromising stability. Board level parasitic capacitance can often fall into the range of a picofarad or more, and should be minimized through good circuit-board layout practices to avoid compromising the stability of the OPA300/OPA301. For more information on detecting parasitics during testing, see the Application Note Measuring Board Parasitics in High-Speed Analog Design (SBOA094), available at the TI web site www.ti.com. DRIVING A 16-BIT ADC The OPA300/OPA301 series feature excellent THD+noise, even at frequencies greater than 1MHz, with a 16-bit settling time of 150ns. Figure 4 shows a total single supply solution for high-speed data acquisition. The OPA300/OPA301 directly drives the ADS8401, a 1.25 mega sample per second (MSPS) 16-bit data converter. The OPA300/OPA301 is configured in an inverting gain of 1, with a 5V single supply. Results of the OPA300/OPA301 performance are summarized in Table 1. ADS8401 10 Ω V IN 1.5nF 130pF (mica) OPA30x 1820 Ω f S =1.25MSPS f=10kHz 5V 130pF (mica) 1820 Ω Figure 4. The OPA30x Drives the 16-Bit ADS8401 PARAMETER RESULTS (f = 10kHz) THD −99.3dB SFDR 101.2dB THD+N 84.2dB SNR 84.3dB Table 1. OPA30x Performance Results Driving a 1.25MSPS ADS8401 |
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