Datasheet

MAX9880A
Low-Power, High-Performance
Dual I
2
S Stereo Audio Codec
24 ______________________________________________________________________________________
Pin Description
PIN
TQFN-EP WLP
NAME FUNCTION
1 B2 SDA/DIN
I
2
C Serial-Data Input/Output (MODE = 0). Connect a pullup resistor to DVDD for
full output swing. SPI compatible serial-data input (MODE = 1).
2 B3 SCL/SCLK
I
2
C Serial-Clock Input (MODE = 0). Connect a pullup resistor to DVDD for full
output swing. SPI-compatible serial clock input (MODE = 1).
3 A2 X1
Crystal Oscillator Input. Connect load capacitor and one terminal of the crystal
to this pin. Acceptable input frequency range: 10MHz to 30MHz.
4 A3 X2
Crystal Oscillator Output. Connect load capacitor and second terminal of the
crystal to this pin.
5 B4 CS SPI-Compatible, Active-Low Chip-Select Input
6 B5 DOUT SPI-Compatible Serial-Data Output
7 A5 MODE I
2
C/SPI Mode Select Input (MODE = 0 for I
2
C mode, MODE = 1 for SPI mode)
8 A4 IRQ
Hardware Interrupt Output. IRQ can be programmed to go low when bits in the
status register 0x00 are set. Read status register 0x00 to clear IRQ once set.
Repeat faults have no effect on IRQ until it is cleared by reading the I
2
C status
register 0x00. Connect a 10k pullup resistor to DVDD for full output swing.
9 A6 AVDD Analog Power Supply. Bypass to AGND with a 1µF capacitor.
10 B6 REF Converter Reference. Bypass to AGND with a 2.2µF capacitor (1.23V nominal).
11, 14,
28, 33,
35, 48
C4, D4,
C5, D6
N.C. No Connection. Connect to GND.
12 A7 PREG
Positive Internal Regulated Supply. Bypass to AGND with a 1µF capacitor (1.6V
nominal).
13 C6 REG
PREG/2 Voltage Reference. Bypass to AGND with a 1µF capacitor (0.8V
nominal)
15 A8 AGND Analog Ground
16 B7 MICVDD Microphone Bias Power Supply. Bypass to AGND with a 1µF capacitor.
17 B8 MICBIAS
Low-Noise Microphone Bias. Connect a 2.2k to 470 resistor to the positive
output of the microphone. Bypass to AGND with a 1µF capacitor.
18 C7
MICLN/
DIGMICCLK
Left Negative Differential Microphone Input. AC-couple a microphone with a series
1µF capacitor. Also digital microphone clock output. Selectable through I
2
C.
19 D7
MICLP/
DIGMICDATA
Left Positive Differential Microphone Input. AC-couple a microphone with a
series 1µF capacitor. Also digital microphone data input. Selectable through
I
2
C.
20 C8
MICRP/
SPDMDATA
Right Positive Differential Microphone Input or SPDM Data Output. AC-couple a
microphone with a series 1µF capacitor. Selectable through I
2
C.
21 D8
MICRN/
SPDMCLK
Right Negative Differential Microphone Input or SPDM Clock Output. AC-couple
a microphone with a series 1µF capacitor. Selectable through I
2
C.
22 D5 JACKSNS/AUX
Jack Sense. Detects the presence or absence of a jack. See the Headset
Detection section. When used as an auxiliary ADC input, AUX is used to
measure DC voltages.