CX20741/45 I
2
S Audio Codec with 2W Class-D,
Capless HP, and Digital Microphone
Features
2 pairs of independent DACs and 3
pairs of independent ADCs
Sampling rates include 16-bit, 44.1
kHz to 24-bit, 192 kHz for DACs, and
from 16-bit, 44.1 kHz to 24-bit; 96 kHz
for ADCs.
Integrated 2 WRMS (per channel)
class-D stereo speaker amplifier
Capless headphone eliminates BOM
Dedicated Line Output
Multiple input/output retaskable ports
Stereo Digital Microphone interface
Integrated boost for all microphones
Two independent SPDIF outputs
Integrated regulators maximize
performance
Microphone Security Control
Integrated headphone limiter (GS
Mark)
D-Flex Power Management
Wake on PC BEEP
PopShield eliminates pops and clicks
Fidelity exceeds Microsoft WHCK
requirements
Jack sense detects up to 8 jacks
Digital Mixer
Compliant with all Intel High Definition
Audio Specifications
Selectable 1.5V/3.3 V link signaling
Available in 48-/56-QFN and in 48-/
64-QFP packages
Overview
The CX20741/45 are I
2
S audio codecs with integrated stereo Class-D speaker
amplifiers, capless headphone amplifiers and provides 98 dB dynamic range. The
CX20745 supports the Industrial temperature range while the CX20741 supports the
Commercial temperature range.
The integrated filter-less Class-D stereo amplifier with Spread Spectrum EMI dispersion
technology is capable of driving up to 2W RMS per channel into 4
Ω
speakers. Built-in,
fully configurable hardware EQ and Dynamic Range Compression improve frequency
response, maximize output volume, and get maximum audio performance from
integrated speakers while remaining independent of driver and OS.
A stereo pair of capless headphone drivers includes integrated short circuit protection
and auto-recovery. These high performance headphone drivers save cost by eliminating
external headphone amplifiers and DC blocking capacitors. The capless architecture
outputs a full-range frequency response of 98 dB or better. Both Apple and Nokia style
headsets are supported as well inline command sensing for headset button controls.
One single-ended analog line output can be used to drive powered speakers or external
devices. One stereo differential Microphone/Line In port is available and it is re-taskable
to single-ended. Programmable microphone boost and bias is provided. Local analog
loopbacks with EQ/DR from Line or Microphone inputs to the outputs can be configured.
A digital microphone interface allows interfacing to two digital microphones. That
interface includes a hardware DC-level filter that eliminates problems caused by digital
microphones with DC offset with programmable clock outputs. Hardware Automatic Gain
Control (AGC) is available for all microphone paths to normalize the capture levels in real
time. The digital I/Os, I
2
C and I
2
S interfaces support a wide range of and all run at 3.3V.
The Hardware Digital Volume Control supports up-down buttons as well as an infinity
volume control knob commonly found in high-end AV equipment.
Two integrated Low Dropout Regulators (LDOs) generate the internal clean power rails
needed for analog and digital. All output ports feature PopShield circuitry that eliminates
pops and clicks. Jack sensing is available that can detect up to four jacks with
programmable switch de-bounce times.
.
Software
Linux
Android 3.x/4.x
DSP Plug-ins
Voice input processing
Block Diagram
Applications
Tablets
Portable Media Players
Smartphones
Digital Docking Stations
Part Number CX20741/45
Description
I
2
S Audio Codec
CONEXANT [ CONEXANT SYSTEMS, INC ]
