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LTC1405 Datasheet(PDF) 11 Page - Linear Technology |
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LTC1405 Datasheet(HTML) 11 Page - Linear Technology |
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11 / 20 page  11 LTC1405 1405fa Table 2. Comparison of Analog Input Configurations SUPPLIES COUPLING VREF GAIN AIN + AIN – COMMENTS ±5V DC 4.096V 1x ±2.048 0 Best SNR, THD 5V DC 4.096V 2x 2.5 ± 1.024 2.5 Best SINAD, THD for Single Supply 5V DC 2.048V 1x 2.5 ± 1.024 2.5 Worse Noise than Above Case 5V DC 4.096V 1x 2.5 ± 2.048 2.5 Best Single Supply Noise, THD Is Not Optimal 5V DC 4.096V 1x 0 to 4.096 2.048 Same As Above ±5V AC 4.096V 1x ±1.024 ±1.024 Very Best SNR, THD (Transformer) 5V AC 4.096V 1x 2.5 ± 1.024 2.5 ± 1.024 Very Best SNR, THD for Single Supply (Transformer) APPLICATIO S I FOR ATIO 1405 F05 1µF +AIN VSS VIN 2.5V LTC1405 5V –AIN VCM 1405 F06 +AIN VSS VIN 4.096V 0V 5V 2.048V LTC1405 5V –AIN SENSE Figure 4. DC Coupling a Ground Centered Signal (Dual Supply System) Figure 5. DC Coupling a Signal Centered Around 2.5V (Single Supply System) Figure 6. DC Coupling a 0V to 4.096V Signal AC Coupling the Input The analog inputs to the LTC1405 can also be AC coupled through a capacitor, though in most cases it is simpler to directly couple the input to the ADC. Figure 7 shows an example where the input signal is centered around ground and the ADC operates from a single 5V supply. Note that the performance would improve if the ADC was operated from a dual supply and the input was directly coupled (as in Figure 4). With AC coupling the DC resistance to ground should be roughly matched for AIN+ and AIN– to maintain offset accuracy. DC Coupling the Input In most applications the analog input signal can be directly coupled to the LTC1405 inputs. If the input signal is centered around ground, such as when dual supply op amps are used, simply connect AIN– to ground and con- nect VSS to – 5V (Figure 4). In a single power supply system with the input signal centered around 2.5V, con- nect AIN– to VCM and VSS to ground (Figure 5). If the input signal is not centered around ground or 2.5V, the voltage for AIN– must be generated externally by a resistor divider or a voltage reference (Figure 6). 1405 F07 +AIN VSS VIN 1µF 0V C C RR LTC1405 5V –AIN VCM Figure 7. AC Coupling to the LTC1405. Note That the Input Signal Can Almost Always Be Directly Coupled with Better Performance 1405 F04 1µF +AIN VSS VIN 0V LTC1405 5V –5V –AIN VCM |
Similar Part No. - LTC1405_1 |
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