CX20741 Datasheet, PDF (1/2 Pages) Conexant Systems, Inc – Dedicated Line Output

CX20741/45 I²S 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
Software
‹ Linux
‹ Android 3.x/4.x
‹ DSP Plug-ins
‹ Voice input processing
Overview
The CX20741/45 are I²S 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, I²C and I²S 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.
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Block Diagram
Applications
‹ Tablets
‹ Portable Media Players
‹ Smartphones
‹ Digital Docking Stations
Part Number CX20741/45
Description I²S Audio Codec