CX20810/CX20811 High-Definition Voice Capture IC AudioSmart™ Product Brief Four-Channel High Performance Microphone Array ADCs with Programmable Pre-amplifier and Class D PWM Out The CX20810 and CX20811 are the industry's first dedicated voice capture ICs that are designed to service the most demanding voice interactive applications. • • • Applications • • • Voice interactive products Voice capture systems In-vehicle infotainment gpio_0 PL L gpio_1 D ig ita l 3 .3 V LDO C o re 1.2V C h a rg e-Pu m p vdd 33_ref An a lo g 3.3V LDO vref R eferences gpio_2 vs s_ a n a _2 vd d 3 3 _ a n a _ 2 vs s_ a n a _1 vd d 3 3 _ a n a _ 1 vd d _ ld o 3 3 o u t vd d _ ld o 3 3 in vs s_ cp 1 2 vd d _ cp 1 2 o u t cp 1 2 _ fly n cp 1 2 _ fly p vd d _ cp 1 2 in cp 1 2 _ e n a vss _ p wr ld o 3 3 d ig _ o u t ld o 3 3 d ig _ e n System Block Diagram vd d 1 8 _ p ll The CX20811 adds a mono digital PWM class D amplifier for ringer and audio playback functions. The class D amplifier output drives up to 1W-rms into a 4 load. The PWM output can be configured to support an external output stage amplifier for higher output power applications. • vd d _ i2 s The CX20810 features high-resolution digital and analog gain control over a wide range, allowing a selection of optimal operating points for microphones with a wide range of sensitivity. The smooth gain ramping circuit allows dynamically adjusting microphone gain without introducing audible artifacts. • • Digitally controlled gain adjustment: – Analog gain 0dB to 30dB with 0.5dB steps – Digital gain –74dB to 12dB with 0.125dB steps – Gain ramping minimizes audible artifacts when gain switching Integrated offset calibration to minimize the BOM Four programmable biquads to configure Q-notch, HPF, or other type of filters Integrated LDO allows single supply (3V~5.5V) to minimize the BOM Integrated charge pump for power management Consumes very low power; 0.02mW in sleep mode Digital class D PWM output up to 1W into 4 speakers on the CX20811 vd d 3 3 _ d ig The CX20810 is a high performance, analog front-end, high-definition voice capture IC for voice recognition, control, and conferencing applications. The device supports a microphone array with up to four synchronized ADCs and programmable pre-amplifiers. Each preamplifier has a dedicated micbias supply that eliminates crosstalk. The entire input path guarantees 106dB dynamic range, which allows the voice system to use the full performance of a high SNR microphone using low microphone boost to prevent microphone saturation. This path is critical for far field applications, and also ideal for compact speaker-phone designs where the microphone and speakers are in close proximity. • vd d Product Overview vrefp vrefn gpio_3 vss _ref i2c _dev_id0 s_sda s _scl m clk tx _clk tx_data_1 m ic -in PGA AD C AAF m ic -in PGA AD C AAF m ic -in PGA AD C AAF m ic -in PGA ana_inp1 ana_inn1 D e cim a tio n Filte rs Q-n o tch Filte r H ig h p a ss Filte rs Pro g ra m m a b le Ga in M ixin g ana_inp2 ana_inn2 ana_inp3 ana_inn3 ana_inp4 ana_inn4 tx_data_2 tx_lrck PW M M o d u la to r rx_clk PW M D rive r rx_data CX20810, CX20811 Conexant Confidential • www.conexant.com • 004-1011PBR00 M ic Bias m icbias 1 M ic Bias m icbias 2 M ic Bias m icbias 3 M ic Bias m icbias 4 vss _ p wm vss _ana_3 p w m_ o u tn rx_lrck vd d 3 3 _ p wm • • Four high-performance ADCs with pre-amplifiers Microphone/line input support Dynamic range: 106dB at PGA gain = 0dB THD+n: –85dB measured at –1dBFS Supported audio sample rates of: 8kHz, 16kHz, 22.05kHz, 24kHz, 32kHz, 44.1kHz, 48kHz, 88.2kHz, and 96kHz ADCs channels mixer Four micbias voltages from 1.5V to 4V AAF vss _ p wm • • • • • i2c_dev_id1 AD C p w m_ o u tp Key Features rstn F IF O s + inter fac e + r egis ter s test CX20810/CX20811 High-Definition Voice Capture IC | AudioSmart™ Product Brief Additional Features • Configurable low power and high performance modes • Four-wire audio I2S/PCM output supports the four ADC’s data, and also supports TDM • Three-wire audio I2S/PCM input on the CX20811 that supports mono DACs • • I2S master and slave mode support Integrated PLL supports 900kHz up to 50MHz input clocks in master mode, and 256Fs in slave mode • Two-wire I2C slave interface for external MCU Four general GPIOs Support of 1.8V and 3.3V digital I/Os CX20810: 48 QFN, 6x6 CX20811: 60 QFN, 7x7 • • • • Ordering Information Part Number Description CX20810-11Z Four-channel input only. Package 6x6mm QFN CX20811-11Z Four-channel input with playback 7x7mm QFN digital PWM class D amplifier. Electrical Characteristics TA = 25 oC, AVDD = DVDD = 3.3 V, 1kHz signal, fs = 48kHz, PGA gain = 0dB Parameter Minimum Typical Maximum Unit Comments Recommended Operating Conditions Analog Voltage Supply (Input to LDO) 3.15 - 5.25 V LDO and charge pump integrated. Digital Core Power Supply - 1.2 2 V LDO and charge pump integrated. Digital I/O Supply—3.3V 3.15 3.3 3.45 V 3.3V signaling levels. Digital I/O Supply—1.8V 1.71 1.8 1.89 V 1.8V Signaling level. Ground (AGND, PGND, DGND) - 0 - - - SNR (A-weighted) - 106 - dB Microphone gain = 6dB (measured at –60dBFS input). THD - –89 - dB Microphone gain = 0dB (measured at –1dBFS input). Microphone Input Power Supply Rejection Ratio - 90 - dB At 217Hz. Mute Attenuation 80 - - dB - Input Resistance 8 - 500 k Input PGA gain setting dependent. Micbias Bias Voltage 1.5 - 4 V - Bias Current - - 10 - - Noise in the Signal Bandwidth - –116 - dBV 20kHz bandwidth. PWM (CX20811 Only) Full-scale Output - 2 - Vrms Scales with supply. SNR (A-weighted) - 89 - dB AVDD = 3.3V, 4 load. THD+n - –53.1 - dB AVDD = 3.3V, 4 load. www.conexant.com Headquarters: 1901 Main Street, Suite 300 Irvine, CA,92614 General Information: U.S. and Canada: 888-855-4562 | International: 1 + 949-483-3000 © 2014 Conexant Systems, Inc. All rights reserved. 004-1011PBR00