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MAX9880A Evaluation Kit
Detailed Description of Hardware
The MAX9880A EV kit evaluates the MAX9880A low-
power, high-performance, stereo audio codec with
audio processing (U1). The EV kit includes input and
output RCA connections, capless and single-ended
headphone connectors (J3, J4), and two on-board digital
microphones (U15, U16). The EV kit also includes USB-
powered low-dropout (LDO) linear regulators that allow
the EV kit to be evaluated without any external supplies.
These LDOs provide the 1.8V and 3.3V voltages required
by the U1 device and support circuitry.
Table 13. SPI Interface
Integrated into the EV kit design is a digital audio trans-
ceiver (U11) and a USB stereo audio DAC (U12). The
digital audio transceiver provides audio input and output
through the on-board TOSLINK connectors (J5, J6), and
the USB stereo audio DAC provides audio input through
the mini-USB connector (J10).
The EV kit also includes a MAXQ2000 microcontroller (U5)
that interfaces with the U1 device’s I 2 C and SPI control
bus and allows the EV kit to be evaluated with the EV kit
software. See the Detailed Description of Software section.
MAXQ2000 SPI INTERFACE
SEG1/P0.1
P5.4/ SS
P5.6/SCLK
P5.7/MISO
P5.5/MOSI
MAXQ2000 GPIO
K2
K9
K10
K11
K12
NET NAME
CS2
CS1
CCLK
MAXQ_MISO
CDIN
FUNCTION
Chip select for the U1 SPI interface
Chip select for the U11 SPI interface
SPI SCLK clock
Master in/slave out
Master out/slave in
Figure 20. Advanced User Interface (3-Wire Interface Tab)
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