Datasheet

MAX9880A

Low-Power, High-Performance

Dual I

S Stereo Audio Codec

______________________________________________________________________________________ 49

ADDRESS

(SEE NOTE)

Input MXINL MXINR AUXCAP AUXGAIN AUXCAL AUXEN 0x22

BITS FUNCTION

MXINL/MXINR

Left/Right ADC Audio Input Mixer

00 = No input selected

01 = Left/right analog microphone

10 = Left/right line input

11 = Left/right analog microphone + line input

Note: If the right line input is disabled, then the left line input is connected to both mixers. Enabling the left

and right digital microphones disables the left and right audio mixer, respectively. See the DIGMICL/

DIGMICR bit description for more details.

AUXCAP

Auxiliary Input Capture

0 = Update AUX with the voltage at JACKSNS/AUX.

1 = Hold AUX for reading.

AUXGAIN

Auxiliary Input Gain Calibration

0 = Normal operation

1 = The input buffer is disconnected from JACKSNS/AUX and connected to an internal voltage reference.

While in this mode, read the AUX register and store the value. Use the stored value as a gain

calibration factor, k, on subsequent readings. AUXCAL must remain set for time indicated in Table 17 to

guarantee an accurate offset calibration.

AUXCAL

Auxiliary Input Offset Calibration

0 = Normal operation

1 = JACKSNS/AUX is disconnected from the input and the ADC automatically calibrates out any internal

offsets. AUXCAL must remain set for time indicated in Table 17 to guarantee an accurate offset

calibration.

AUXEN

Auxiliary Input Enable

0 = Use JACKSNS/AUX for jack detection.

1 = Use JACKSNS/AUX for DC measurements.

Note: Set MXINR = 00, ADLEN = 1, and ADREN = 1 when AUXEN = 1.

Table 18. ADC Input Register

Note: Register addresses listed are for I

C. To get the SPI address, add 0x200 with the following exception: Register 0xFF is not

accessible through SPI.