Product Brief

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.
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Applications
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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.
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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.
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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.
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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
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• 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
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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
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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
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Configurable low power and high performance modes
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Four-wire audio I2S/PCM output supports the four
ADC’s data, and also supports TDM
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Three-wire audio I2S/PCM input on the CX20811 that
supports mono DACs
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I2S master and slave mode support
Integrated PLL supports 900kHz up to 50MHz input
clocks in master mode, and 256Fs in slave mode
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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
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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)
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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
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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
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–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.
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004-1011PBR00