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PDF WM8775 Data sheet ( Hoja de datos )

Número de pieza WM8775
Descripción 24 BIT 96 KHZ ADC WITH 4 CHANNEL I/P MULTIPLEXER
Fabricantes Wolfson Microelectronics plc 
Logotipo Wolfson Microelectronics plc Logotipo



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WM8775
24-bit, 96kHz ADC with 4 Channel I/P Multiplexer
DESCRIPTION
The WM8775 is a high performance, stereo audio ADC
with a 4 channel input mixer. The WM8775 is ideal for
digitising multiple analogue sources for surround sound
processing applications for home hi-fi, automotive and
other audio visual equipment.
A stereo 24-bit multi-bit sigma delta ADC is used with a
four stereo channel input selector. Each channel has
programmable gain control. Digital audio output word
lengths from 16-32 bits and sampling rates from 32kHz
to 96kHz are supported.
The audio data interface supports I2S, left justified, right
justified and DSP digital audio formats.
The device is controlled via a 2 or 3 wire serial interface.
The interface provides access to all features including
channel selection, volume controls, mutes, de-emphasis
and power management facilities.
The device is available in a 28-lead SSOP package. The
WM8775 is software compatible with the WM8776.
BLOCK DIAGRAM
FEATURES
Audio Performance
102dB SNR (‘A’ weighted @ 48kHz)
-90dB THD
ADC Sampling Frequency: 32kHz – 96kHz
Four stereo ADC inputs with analogue gain adjust from
+24dB to –21dB in 0.5dB steps
Digital gain adjust from -21.5dB to -103dB.
Programmable Automatic Level Control (ALC) or Limiter on
ADC input
3-Wire SPI Compatible or 2-wire Serial Control Interface
Master or Slave Clocking Mode
Programmable Audio Data Interface Modes
I2S, Left, Right Justified or DSP
16/20/24/32 bit Word Lengths
2.7V to 5.5V Analogue, 2.7V to 3.6V Digital supply Operation
APPLICATIONS
Surround Sound AV Processors and Hi-Fi systems
Automotive Audio
AINOPL
AINOPR
AINVGL
AINVGR
AIN1L
AIN1R
AIN2L
AIN2R
AIN3L
AIN3R
AIN4L
AIN4R
VMID
W
WM8775
STEREO
ADC
AUDIO INTERFACE
ALC AND
DIGITAL FILTERS
MCLK
DOUT
ADCLRC
BCLK
CONTROL INTERFACE
WOLFSON MICROELECTRONICS plc
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Production Data, October 2008, Rev 4.4
Copyright ©2008 Wolfson Microelectronics plc

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WM8775 pdf
Production Data
WM8775
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are stress ratings only. Permanent damage to the device may be caused by continuously operating at
or beyond these limits. Device functional operating limits and guaranteed performance specifications are given under Electrical
Characteristics at the test conditions specified.
ESD Sensitive Device. This device is manufactured on a CMOS process. It is therefore generically susceptible
to damage from excessive static voltages. Proper ESD precautions must be taken during handling and storage
of this device.
Wolfson tests its package types according to IPC/JEDEC J-STD-020B for Moisture Sensitivity to determine acceptable storage
conditions prior to surface mount assembly. These levels are:
MSL1 = unlimited floor life at <30°C / 85% Relative Humidity. Not normally stored in moisture barrier bag.
MSL2 = out of bag storage for 1 year at <30°C / 60% Relative Humidity. Supplied in moisture barrier bag.
MSL3 = out of bag storage for 168 hours at <30°C / 60% Relative Humidity. Supplied in moisture barrier bag.
The Moisture Sensitivity Level for each package type is specified in Ordering Information.
CONDITION
Digital supply voltage
Analogue supply voltage
Voltage range digital inputs (MCLK, ADCLRC, BCLK, DI, CL, CE and
MODE)
Voltage range analogue inputs
Master Clock Frequency
Operating temperature range, TA
Junction Temperature, TJ
Storage temperature
Notes:
1. Analogue and digital grounds must always be within 0.3V of each other.
MIN
-0.3V
-0.3V
DGND -0.3V
AGND -0.3V
-25°C
-25°C
-65°C
MAX
+3.63V
+7V
DVDD + 0.3V
AVDD +0.3V
37MHz
+85°C
+125°C
+150°C
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Digital supply range
Analogue supply range
SYMBOL
DVDD
AVDD
TEST CONDITIONS
Ground
Difference DGND to AGND
AGND, DGND
Note: Digital supply DVDD must never be more than 0.3V greater than AVDD.
MIN
2.7
2.7
-0.3
TYP
0
0
MAX
3.6
5.5
+0.3
UNIT
V
V
V
V
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PD, Rev 4.4, October 2008
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WM8775 arduino
Production Data
WM8775
Test Conditions
AVDD = 5V, DVDD = 3.3V, AGND = 0V, DGND = 0V, TA = +25oC, fs = 48kHz, MCLK = 256fs unless otherwise stated
PARAMETER
Program Register Input Information
CL Frequency
CL Low Pulse-Width
CL High Pulse-Width
Hold Time (Start Condition)
Setup Time (Start Condition)
Data Setup Time
DI, CL Rise Time
DI, CL Fall Time
Setup Time (Stop Condition)
Data Hold Time
Pulse width of spikes that will be suppressed
SYMBOL
t1
t2
t3
t4
t5
t6
t7
t8
t9
tps
MIN TYP MAX
0 526
1.3
600
600
600
100
300
300
600
900
05
Table 5 2-Wire Control Interface Timing Information
UNIT
kHz
us
ns
ns
ns
ns
ns
ns
ns
ns
ns
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PD, Rev 4.4, October 2008
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