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MAX9880A Evaluation Kit
Measuring DC Voltages (AUX)
To utilize this feature, configure jumper JU7 according to
Table 19, remove the shunt from jumper JU29, ensure that
a headphone plug is not plugged in to jumper JU3, and
enable the AUX block on the Analog Audio tab, and refer
to the ADC section in the MAX9880A IC data sheet for
setup and configuration details. The applied DC voltage
(V AUX ) is divided down before measured by the device’s
ADC. The measured DC voltage (V DC ) is:
pads provided on the EV kit, in conjunction with the JU10
and JU11 jumpers. Refer to the Headphone Modes sec-
tion of the MAX9880A IC data sheet.
To facilitate evaluation with single-ended and capaci-
torless output modes, the EV kit provides two 3.5mm
headphone jacks (J3, J4). The J4 headphone jack is
configured for capacitorless output mode and the J3
headphone jack is configured for single-ended output
mode.
V DC =
R5
(R5 + R6)
x V AUX
On-Board LDOs
The EV kit includes on-board LDO linear regulators (U6,
where the default divider ratio is equal to 1/2.
Audio Inputs and Outputs
The U1 device’s audio inputs and outputs are routed
to the various connectors, headers, and pads on the
EV kit. Table 20 lists the audio input connections and
Table 21 lists the audio output connections. Refer to the
MAX9880A IC data sheet and EV kit software for audio
signal routing details (i.e., which audio inputs can be
routed to the available audio outputs).
Headphone Outputs
The U1 device supports three headphone output modes,
single-ended, differential, and capacitorless. All three
modes can be evaluated using the ROUT_ and LOUT_
Table 20. Audio Inputs
U8, U9, and U10), allowing the EV kit to operate without
external power supplies. These LDO regulators provide
power to the U1 device’s power-supply pins: DVDD,
MICVDD, PVDD, AVDD, and DVDDS1. The LDO regula-
tor outputs can be isolated from the power-supply pins
through jumpers JU14–JU17, and JU22, respectively.
A fifth LDO linear regulator (U7) provides power to the
MAXQ2000 circuit, level translators (U4, U17), crystal
oscillator (Y2), stereo digital audio transceiver (U11),
USB stereo audio DAC (U12), and S/PDIF connectors
(J5, J6). All the LDO linear regulators are powered by the
USB bus voltage (+5V) from the J7 mini-USB connector.
Table 21. Audio Outputs
AUDIO
INPUT
J1
J2
J6
J10
MICL_ pad
MICR_ pad
U15
U16
U1 PIN
LINL
LINR
S1 interface*
S2 interface*
MICL_
MICR_
MICL_
MICL_
DESCRIPTION
Single-ended left line input
(LINEINL)
Single-ended right line input
(LINEINR)
S/PDIF audio input from U11
USB audio input from U12
Left analog microphone
Right analog microphone
Left digital microphone
(DIGMIC_)
Right digital microphone
(DIGMIC_)
AUDIO
OUTPUT
J3
J4
J5
J8
J9
ROUT_ pads
LOUT_ pads
U1 PIN
ROUTP and
LOUTP
ROUTP, LOUTP,
and LOUTN
S1 interface*
LOUTR
LOUTL
ROUT_
LOUT_
DESCRIPTION
Single-ended headphone
output with jack detection
Capless headphone
output
S/PDIF audio output on
U11
Single-ended line output
(OUTR)
Single-ended line output
(OUTL)
Right headphone output
Left headphone output
* S_ interface pins = SDOUTS_, SDINS_, BCLKS_,
and LRCLKS_.
* S_ interface pins = SDOUTS_, SDINS_, BCLKS_, and LRCLKS_.
26
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