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AD73322LAST Datasheet(PDF) 28 Page - Analog Devices |
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AD73322LAST Datasheet(HTML) 28 Page - Analog Devices |
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28 / 40 page  REV. 0 AD73322L –28– VFBN1 GAIN 1 VREF VINN1 VINP1 VFBP1 VOUTP1 VOUTN1 REFOUT REFERENCE AD73322L VREF 50k 100pF 50k 100pF 50k 50k REFCAP 0.1 F 0/38dB PGA +6/–15dB PGA CONTINUOUS TIME LOW-PASS FILTER Figure 26. Analog Input (DC-Coupled) Using Internal Amplifiers In the case of ac coupling, a capacitor is used to couple the signal to the input of the ADC. The ADC input must be biased to the internal reference (REFCAP) level which is done by connecting the input to the REFOUT pin through a 10 k Ω resistor as shown in Figure 27. VFBN1 GAIN 1 VREF VINN1 VINP1 VFBP1 VOUTP1 VOUTN1 REFOUT REFERENCE VREF 100 100 0.1 F REFCAP 0.1 F 0/38dB PGA 0.047 F 0.047 F 10k 0.1 F 10k +6/–15dB PGA CONTINUOUS TIME LOW-PASS FILTER AD73322L Figure 27. Analog Input (AC-Coupled) Differential If the ADC is being connected in single-ended mode, the AD73322L should be programmed for single-ended mode using the SEEN and INV bits of CRF and the inputs connected as shown in Figure 28. When operated in single-ended input mode, the AD73322L can multiplex one of the two inputs to the ADC input. VFBN1 GAIN 1 VREF VINN1 VINP1 VFBP1 VOUTP1 VOUTN1 REFOUT REFERENCE 0/38dB PGA VREF 0.047 F 100 10k 0.1 F REFCAP 0.1 F +6/–15dB PGA CONTINUOUS TIME LOW-PASS FILTER AD73322L Figure 28. Analog Input (AC-Coupled) Single-Ended If best performance is required from a single-ended source, it is possible to configure the AD73322L’s input amplifiers as a single-ended to differential converter as shown in Figure 29. VFBN1 GAIN 1 VREF VINN1 VINP1 VFBP1 VOUTP1 VOUTN1 REFOUT REFERENCE 0/38dB PGA 50k 100pF 50k 100pF 50k 50k REFCAP 0.1 F VREF +6/–15dB PGA CONTINUOUS TIME LOW-PASS FILTER AD73322L Figure 29. Single-Ended to Differential Conversion On Analog Input Interfacing to an Electret Microphone Figure 30 details an interface for an electret microphone which may be used in some voice applications. Electret microphones typically feature a FET amplifier whose output is accessed on the same lead which supplies power to the microphone; there- fore this output signal must be capacitively coupled to remove the power supply (dc) component. In this circuit the AD73322L input channel is being used in single-ended mode where the internal inverting amplifier provides suitable gain to scale the input signal relative to the ADC’s full-scale input range. The buffered internal reference level at REFOUT is used via an external buffer to provide power to the electret microphone. This provides a quiet, stable supply for the microphone. If this is not a concern, then the microphone can be powered from the system power supply. |
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