Audio

Speakers-on-a-Chip

Conexant’s portfolio includes a comprehensive suite of semiconductor

solutions for communications and consumer applications.

The CX20707 is one of Conexant’s Speakers-on-a-Chip (SPoC) embedded audio

solutions designed for voice communication applications, such as Two-way

Intercoms, Security Intercoms, and Doorphone Systems. The device features a

proprietary on-chip Digital Signal Processor (DSP), Codec, Mono Class-D Driver,

I2S and I2C interfaces, high performance 24-bit DAC’s and ADC’s, a range of

digital and analog input/output channel selections for flexible routing and mixing,

and a mono capless headphone driver in a cost-effective single-chip package.

The DSP runs a suite of turnkey audio and voice enhancement algorithms that

dramatically improve sound quality. This product is part of the CX2070x SPoC family,

which includes CX20702, CX20703, CX20704, CX20705, CX20706 and CX20709.

The device features multiple high performance 24-bit DACs for mono speaker

output, multiple 24-bit high performance ADCs supporting mono microphone

and mono line input, mono capless headphone output or mono single-ended/

differential line output, support for bi-directional 12S, PCM, S/PDIF-out with

independent sampling rates, and a range of digital and analog input/output

channel selections for flexible routing and mixing. Different audio sampling

rates ranging from 8 kHz to 96 kHz are generated directly from the master clock

without the need for external PLL. The mono Class-D amplifier drives a maximum

of 2.5 W (average) from the integrated amplifier. The device can be controlled

and configured by both read and write capability through I2C and Serial Peripheral

Interface (SPI), or UART.

The on-chip DSP runs a suite of innovative Conexant proprietary voice processing

algorithms and audio post processing effects that that delivers a clear, rich and

full sound experience to the end user and frees-up processing power for other

applications without compromising on cost and future firmware scalability. Key

audio innovations include Subband Acoustic Echo Suppression and Cancellation,

Noise Reduction, Subband Line Echo Cancellation, Equalizer, Dynamic Range

Compression, and Mic Auto Gain Control. The embedded SPoC Configuration

Toolbox allows for fast configuration and performance optimization.

The CX20707 turnkey solution eliminates the need for a multiple-chip reference

design, making it easy and economical for manufacturers to design products for

high quality intercom applications. A complete evaluation kit with reference board

and all the necessary technical documents and software is available.

The SoC is packaged in an environmentally-friendly, RoHS/Green-compliant 76-pin

QFN (Quad Flat No leads) package.

Applications

•Two-wayIntercom

•SecurityIntercom

•DoorphoneSystems

Distinguishing Features

• 24-bit DAC/ADC, SNR 102 dB, THD - 92 dB at

48 kHz 3.3 V

• Programmable on-chip proprietary DSP

– Subband acoustic echo suppression and

cancellation

– Noise reduction for inbound speech (far end)

and outbound speech (near end)

– Subband line echo canceller

– Dynamic loudness adaptor

– Mic auto gain control

– Digital equalizer (10 bands/channel)

– Dynamic range compression

• One 2-wire I2C or 4-wire SPI slave, or UART

interface for external MCU

• 2.5 W BTL mono Class-D speaker amplifier

• Mono microphone interfaces with on-chip bias

supply

• Flexible power management

• Audio sample rate: 8, 11.025, 12, 16, 22.05, 24, 32,

44.1, 48, 64, 88.2, 96 kHz

Part Number CX20707

Description

Speakers-on-a-Chip with On-chip

Voice/Audio DSP, Integrated I2S/ I2C

Codec, and Mono Class-D Amplifier

Speakers-on-a-Chip with On-chip Voice/Audio DSP, Integrated

I2S/I2C Codec, and Mono Class-D Amplifier

CX20707