Datasheet

MAX9867
Ultra-Low Power Stereo Audio Codec
20 ______________________________________________________________________________________
Pin Description
PIN/BUMP
TQFN-EP WLP
NAME FUNCTION
1 A2 DGND Digital Ground
2 B3 SCL I
2
C Serial-Clock Input. Connect a pullup resistor to a 1.7V to 3.3V supply.
3 A3 SDA I
2
C Serial-Data Input/Output. Connect a pullup resistor to a 1.7V to 3.3V supply.
4C3 IRQ
Hardware Interrupt Output. IRQ can be programmed to pull low when bits in
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 register 0x00.
Connect a 10kΩ pullup resistor to a 1.7V to 3.3V supply.
5 A4 AVDD Analog Power Supply. Bypass to AGND with a 1µF capacitor.
6 B4 REF Converter Reference. Bypass to AGND with a 2.2µF capacitor (1.23V nominal).
7 A5 PREG
Positive Internal Regulated Supply. Bypass to AGND with a 1µF capacitor (1.6V
nominal).
8 B5 REG PREG/2 Voltage Reference. Bypass to AGND with a 1µF capacitor (0.8V nominal).
9 A6 AGND Analog Ground
10 B6 MICBIAS
Low-Noise Microphone Bias. Connect a 2.2kΩ to 470Ω resistor to the positive
output of a microphone (1.525V nominal). Bypass to AGND with a 1µF capacitor.
11 C5
MICLN/
DIGMICCLK
Left Negative Differential Microphone Input or Digital Microphone Clock Output.
For analog microphones, AC-couple to the negative output of a microphone with a
1µF capacitor. For digital microphones, connect to the clock input of the
microphone.
12 C6
MICLP/
DIGMICDATA
Left Positive Differential Microphone Input or Digital Microphone Data Input. For
analog microphones, AC-couple to the positive output of a microphone with a 1µF
capacitor. For digital microphones, connect to the data output of the
microphone(s). Up to two digital microphones can be connected.
13 C4 MICRP
Right Positive Differential Microphone Input. AC-couple to the positive output of a
microphone with a 1µF capacitor.
14 D6 MICRN
Right Negative Differential Microphone Input. AC-couple to the negative output of
a microphone with a 1µF capacitor.
15 D5 LINL Left-Line Input. AC-couple analog audio signal to LINL with a 1µF capacitor.
16 E6 LINR Right-Line Input. AC-couple analog audio signal to LINR with a 1µF capacitor.
17 D4 JACKSNS/AUX
Jack Sense or Auxiliary ADC Input. When configured for jack detection, JACKSNS
detects the presence or absence of a jack. See the Mode Configuration section
for details. When configured as an auxiliary ADC input, AUX is used to measure
DC voltages.
18 E5 PGND Headphone Power Ground
19 D3 ROUTP
Positive Right-Channel Headphone Output. Connect directly to the load in
differential and capacitorless mode. AC-couple to the load in single-ended mode.
20 E4 ROUTN
Negative Right-Channel Headphone Output. Inverting output in differential mode.
Leave unconnected in capacitorless and fast turn-on single-ended mode. Bypass
with a 1µF capacitor to AGND in clickless, single-ended mode.
21 D2 LOUTN
Negative Left-Channel Headphone Output. Noninverting output in differential
mode. Common headphone return in capacitorless mode. Leave unconnected in
fast turn-on single-ended mode. Bypass with a 1µF capacitor to AGND in clickless
single-ended mode.