KX1400 Audio Playback IC
The KX1400 is an audio playback IC
designed to play 8 kHz audio data
directly to an external speaker via an
on-chip digital audio processor and
class-D driver. Both 12-bit PCM and
4-bit IMA ADPCM data formats are
supported. It also has a built-in tone
generator capable of generating
tones at 4096 different frequencies.
The on-chip audio processor
eliminates the need for an external
low-pass filter in most cases. The
KX1400 utilizes low-power CMOS
technology and provides a stand-by
power-savings state, making it well
suited for battery-powered
The KX1400 operates in either a
standalone mode or interfaced to a
microcontroller (MCU) host. Audio data
is provided to the KX1400 from either a
user-programmed external serial
memory or from the host MCU. Under
MCU control, the user can select
phrases or tone sequences to play from
the external memory, play tone
sequences via commands, or stream
audio data directly to the on-chip audio
processor. In standalone mode, no
MCU is required; on reset, the KX1400
plays a single phrase from external
memory and then returns to a stand-by
power-saving state.
Example Application Circuit
The example circuit shown in the right
column below shows the KX1400 in
host-controlled operation with audio
data stored in external serial memory.
Commands are sent from the MCU to
play tones and audio phrases from
external memory. Audio data and
commands can also be stored in the
MCU's data memory and transmitted to
the KX1400, eliminating the need for
an external memory IC.
applications.
+VDD
VDD
SPO -
SPO+
VDD2
MSIZE
MODE
RST
MSSL
MISO
MCLK
MOSI
CS
SO
SCK
SI
VCC
MSSL
MCLK
MOSI
P1.0
CS
GND
SCL
Serial
Memory
SDI
BUSY
P1.1
RDY (Optional)
XTAL1
CLKOUT (Optional)
Optional
H ost MC U
GPO1
GPO 2
GND
GND
Conexant Part
Ordering Number
Number
Description
Packages
Part Number KX1400
KX1400EG-11Z
KX1400DK-EVK
KX1400EG-11Z
KX1400DK-EVK
KX1400 Audio Playback IC
KX1400 Evaluation Kit
24QFN 4x4mm
Description KX1400 Audio
Playback IC
The devices are lead-free (Pb free) and RoHS compliant
