CS47L15 datasheet(32/279 Pages) CIRRUS

номер детали	CS47L15

подробное описание детали	Smart Codec with Low-Power Audio DSP

PDF	279 Pages

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производитель	CIRRUS [Cirrus Logic]

домашняя страница	http://www.cirrus.com

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DS1137F2

CS47L15

4.2 Input Signal Path

The IN2 analog input path supports differential connection only, as shown in Fig. 4-2. The IN2 analog line input

configuration is shown in Fig. 4-9. The gain of the IN2 signal path PGA is fixed at 14 dB.

Note that IN2 analog input supports ground-referenced input signals only. Input capacitors must not be used on the IN2x

pins.

Figure 4-9. Differential Line Input

4.2.3

Analog Input—Speaker Current Monitoring

The IN2 analog input path is optimized for supporting speaker-protection applications. In these applications, the IN2 pins

are used to provide feedback from current-monitoring connections on the Class D speaker outputs. Speaker-protection

software, running on the integrated DSP core, enables the operational limits to be continually optimized for the particular

loudspeaker and the prevailing conditions.

Typical connections for speaker-protection applications, including the analog feedback path to the IN2 pins, are shown in

Fig. 4-10.

Figure 4-7. Single-Ended Line Input

Figure 4-8. Differential Line Input

GND

Line

To ADC

VREF

IN1xN

IN1xP

PGA

–

To ADC

VREF

IN1xN

IN1xP

Line

PGA

–

To ADC

VREF

IN2N

IN2P

Line

PGA

–

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