CS47L15 datasheet(30/279 Pages) CIRRUS

30 / 279 page

DS1137F2

CS47L15

4.2 Input Signal Path

Figure 4-2. Input Signal Paths

4.2.1

Analog Microphone Input

Up to four analog microphones can be connected to the CS47L15, in single-ended or differential configuration. The input

configuration and pin selection for the IN1 signal paths is controlled using IN1x_SRC, as described in Section 4.2.7.

Note: The IN2 analog input path is optimized for supporting speaker-protection applications. It is not suitable for

connection to microphones.

The CS47L15 includes external accessory-detection circuits that can report the presence of a microphone and the status

of a hook switch or other push buttons. When using this function, it is recommended to use the IN1BLP or IN1BRP analog

microphone input paths to ensure best immunity to electrical transients arising from the push buttons.

For single-ended input, the microphone signal is connected to the noninverting input of the PGAs (IN1xP). The inverting

inputs of the PGAs are connected to an internal reference in this configuration.

For differential input, the noninverted microphone signal is connected to the noninverting input of the PGAs (IN1xP), while

the inverted (or noisy ground) signal is connected to the inverting input pins (IN1xN).

ADC

IN1ALN/DMICCLK

IN1ALP/DMICDAT

CLK

DAT

IN1BLN

IN1BLP

ADC

IN2N

IN2P

CLK

DAT

SPKRXDAT

IN1ARN

IN1ARP

IN1BRN

IN1BRP

Digital Mic

Interface

Digital Mic

Interface

SPKCLK timing signal from PDM output path

IN1L_PGA _VOL [6:0]

IN1L_SRC

00 = Differential IN1ALP – IN1ALN

01 = Single-ended IN1ALP (non-inverting)

10 = Differential IN1BLP – IN1BLN

11 = Single-ended IN1BLP (non-inverting)

IN1L_ENA

IN1L_VOL

IN1L_MUTE

IN1R_VOL

IN1R_MUTE

IN1L_HPF

IN1R_HPF

IN_HPF_CUT

IN1_MODE

IN1R_PGA_VOL

IN1R_ENA

IN1_OSR

IN1_DMIC_SUP

IN2L_ENA

IN2L_VOL

IN2L_MUTE

IN2R_VOL

IN2R_MUTE

IN2L_HPF

IN2R_HPF

IN2_MODE

IN2R_ENA

IN2_OSR

IN_VD_RAMP

IN_VI_RAMP

IN1R_SRC

00 = Differential IN1ARP – IN1ARN

01 = Single-ended IN1ARP (non-inverting)

10 = Differential IN1BRP – IN1BRN

11 = Single-ended IN1BRP (non-inverting)

Digital Core

IN2R input

IN2L input

IN1L input

IN1R input

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