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LTC2383CMS-16PBF Datasheet(PDF) 11 Page - Linear Technology |
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LTC2383CMS-16PBF Datasheet(HTML) 11 Page - Linear Technology |
11 / 24 page LTC2383-16 11 238316f APPLICATIONS INFORMATION time is important even for DC inputs, because the ADC inputs draw a current spike when entering acquisition. For best performance, a buffer amplifier should be used to drive the analog inputs of the LTC2383-16. The amplifier provides low output impedance, which produces fast settling of the analog signal during the acquisition phase. It also provides isolation between the signal source and the current spike the ADC inputs draw. Input Filtering The noise and distortion of the buffer amplifier and signal source must be considered since they add to the ADC noise and distortion. Noisy input signals should be filtered prior to the buffer amplifier input with an appropriate filter to minimize noise. The simple 1-pole RC lowpass filter (LPF1) shown in Figure 4 is sufficient for many applications. AnotherfilternetworkconsistingofLPF2andthe100Ωseries input resistors should be used between the buffer and ADC inputs to both minimize the noise contribution of the buffer and to help minimize disturbances reflected into the buffer from sampling transients. Long RC time constants at the analoginputswillslowdownthesettlingoftheanaloginputs. Therefore, LPF2 requires a wider bandwidth than LPF1. A buffer amplifier with a low noise density must be selected to minimize degradation of the SNR. With the 482kHz lowpass filter shown in Figure 4, the LT6350 provides the full data sheet performance of the LTC2383-16. High quality capacitors and resistors should be used in the RC filters since these components can add distortion. NPO and silver mica type dielectric capacitors have excellent linearity. Carbon surface mount resistors can generate distortion from self heating and from damage that may occur during soldering. Metal film surface mount resistors are much less susceptible to both problems. 50Ω 3300pF 6600pF 50Ω 500Ω 100Ω 100Ω LPF2 LPF1 BW = 482kHz BW = 48kHz SINGLE-ENDED- TO-DIFFERENTIAL DRIVER SINGLE-ENDED- INPUT SIGNAL LTC2383-16 IN+ IN– 238316 F04 LT6350 Single-Ended-to-Differential Conversion For single-ended input signals, a single-ended to differential conversion circuit must be used to produce a differential signal at the inputs of the LTC2383-16. The LT6350 ADC driver is recommended for performing single-ended-to- differential conversions.The LT6350 is flexible and may be configured to convert single-ended signals of various amplitudes to the ±2.5V differential input range of the LTC2383-16. The LT6350 is also available in H-grade to complement the extended temperature operation of the LTC2383-16 up to 125°C. Figure 5 shows the LT6350 being used to convert a 0V to 2.5V single-ended input signal. In this case, the first amplifier is configured as a unity gain buffer and the single- ended input signal directly drives the high-impedance input of the amplifier. As shown in the FFT of Figure 5a, the LT6350 drives the LTC2383-16 to full datasheet performance without degrading the SNR or THD . Figure 4. Input Signal Chain LT6350 VCM = VREF/2 2.5V to 0V 0V to 2.5V 0V to 2.5V 238316 F05 OUT1 RINT RINT OUT2 8 4 5 2 1 + – + – – + FREQUENCY (kHz) 0 100 200 300 400 500 –180 –60 –40 –20 –80 –100 –120 –140 –160 0 238316 F05a SNR = 92.2dB THD = –106.2dB SINAD = 92dB SFDR = 110.4dB Figure 5. LT6350 Converting a 0V-2.5V Single-Ended Signal to a ±2.5V Differential Input Signal Figure 5a. 32k Point FFT Plot for Circuit Shown in Figure 5 |
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