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LTC1415 Datasheet(PDF) 13 Page - Linear Technology |
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LTC1415 Datasheet(HTML) 13 Page - Linear Technology |
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13 / 24 page ![]() 13 LTC1415 APPLICATIONS INFORMATION 4.096V to 2.048V and shifts the common mode voltage from half of full scale to 2.274V. AC Coupled Inputs The analog inputs can be AC coupled for applications where the input has no DC information. The input of the ADC does need to be DC biased at midscale. Figures 10d and 10e demonstrate AC coupling and the required bias- ing. Figure 10d shows the ADC with a full scale of 4.096V, a common mode voltage of 2.048V and an input that swings from 0V to 4.096V. This circuit has the lowest noise (SINAD = 72dB to 100kHz) but will have distortion INPUT FREQUENCY (Hz) 80 70 60 50 40 30 20 10 0 1k 100k 1M 2M LTC1415 • F10a 10k Figure 10a. CMRR vs Input Frequency Figure 10b. Shifting the Input Range Up from Ground by 200mV LTC1415 +AIN ANALOG INPUT 1.25V TO 3.298V –AIN VREF REFCOMP AGND LTC1415 • F10c 1 2 3 4 5 10 µF 24 Ω 1 µF VOUT = 1.2V LT1004-1.2 Figure 10c. 2.048V Input Range with a Common Mode Voltage of 2.274V. For Low Distortion AC Applications LTC1415 +AIN ANALOG INPUT 4.096VP-P –AIN VREF REFCOMP AGND LTC1415 • F10d 1 2 3 4 5 10 µF 2k 2k Figure 10d. 4.096VP-P Input Range with AC Coupling. For Low Noise AC Applications LTC1415 +AIN ANALOG INPUT 2.048VP-P –AIN VREF REFCOMP AGND LTC1415 • F10e 1 2 3 4 5 10 µF 1 µF 25 Ω 1k 9k 1k – + LT1004-1.2 Figure 10e. 2.048VP-P Input Range with AC Coupling. For Low Distortion AC Applications LTC1415 +AIN ANALOG INPUT 0.2V TO 4.296V –AIN VREF REFCOMP AGND LTC1415 • F10b 1 2 3 4 5 10 µF R2 3.9k R1 200 Ω |
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