AD73322LYRU datasheet(28/40 Pages) AD

Part #	AD73322LYRU

Description	Low Cost, Low Power CMOS General-Purpose Dual Analog Front End

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REV. 0

AD73322L

–28–

VFBN1

GAIN

1

VREF

VINN1

VINP1

VFBP1

VOUTP1

VOUTN1

REFOUT

REFERENCE

AD73322L

VREF

50k

100pF

50k

100pF

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

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

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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