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LTC2382CMS-16PBF Datasheet(PDF) 11 Page - Linear Technology |
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LTC2382CMS-16PBF Datasheet(HTML) 11 Page - Linear Technology |
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11 / 24 page  LTC2382-16 11 238216f APPLICATIONS INFORMATION Single-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 LTC2382-16. 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 LTC2382-16. The LT6350 is also available in H-grade to complement the extended temperature operation of the LTC2382-16 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 LTC2382-16 to full datasheet performance without degrading the SNR or THD. The LT6350 can also be used to buffer and convert single-ended signals larger than the input range of the LTC2382-16 in order to maximize the signal swing that can be digitized. Figure 6 shows the LT6350 converting a 0V-5V single-ended input signal to the ±2.5V differential input range of the LTC2382-16. In this case, the first amplifier in the LT6350 is configured as an inverting amplifier stage, which acts to attenuate the input signal down to the 0V-2.5V input range of the LTC2382-16. In the inverting amplifier configuration, the single-ended input signal source no longer directly drives a high impedance input of the first amplifier. The input impedance is instead set by resistor RIN. RIN must be chosen carefully based on the source impedance of the signal source. Higher values of RIN tend to degrade both the noise and distortion of the LT6350 and LTC2382-16 as a system. R1, R2 and R3 must be selected in relation to RIN to achieve the desired attenuation and to maintain a balanced input impedance in the first amplifier. Table 1 shows the resulting SNR and THD for several values of RIN, R1, R2 and R3 in this configuration. Figure 6a shows the resulting FFT when using the LT6350 as shown in Figure 6. The LT6350 can also be used to buffer and convert large, true bipolar signals which swing below ground to the ±2.5V differential input range of the LTC2382-16. Figure 7 shows the LT6350 being used to convert a ±10V true bipolar signal for use by the LTC2382-16. The input impedance is again set by resistor RIN. Table 2 shows the resulting SNR and THD for several values of RIN. Figure 7a shows the resulting FFT when using the LT6350 as shown in Figure 7. LT6350 VCM = VREF/2 2.5V to 0V 0V to 2.5V 0V to 2.5V 238216 F05 OUT1 RINT RINT OUT2 8 4 5 2 1 + – + – – + FREQUENCY (kHz) 0 50 100 150 200 250 –180 –60 –40 –20 –80 –100 –120 –140 –160 0 238216 F05a SNR = 92.2dB THD = –106dB SINAD = 92dB SFDR = 107dB 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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