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PDF WM8786 Data sheet ( Hoja de datos )
| Número de pieza | WM8786 | |
| Descripción | Stereo ADC | |
| Fabricantes | Cirrus Logic | |
| Logotipo |  |
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WM8786
24-bit, 192kHz Stereo ADC
DESCRIPTION
The WM8786 is a stereo audio ADC with differential inputs
designed for high performance recordable media
applications. Data is provided as a PCM output.
Stereo 24-bit multi-bit sigma-delta ADCs are used with
digital audio output word lengths of 16 to 32 bits, and
sampling rates from 8kHz to 192kHz. The device also has a
high pass filter to remove residual DC offsets.
The device is hardware controlled. Pin programming
provides access to all features including oversampling rate,
audio format, powerdown, master/slave control and digital
signal manipulation. The device is supplied in a 20-lead
SSOP package.
BLOCK DIAGRAM
FEATURES
SNR 111dB (‘A’ weighted @ 48kHz)
THD -102dB (at -0.1dB)
Sampling Frequency: 8 – 192kHz
Hardware Control Interface
Master or Slave Clocking Mode
Programmable Audio Data Interface Modes
- I2S, Left, Right Justified or DSP
- 24-Bit Word Length
Supply Voltages
- Analogue 4.5 to 5.5V
- Digital core: 2.7V to 3.6V
20-lead SSOP package
APPLICATIONS
Recordable DVD Players
Personal Video Recorders
High End Sound Cards
Studio Audio Processing Equipment
DGND
DVDD
AINR+
AINR-
AINL+
AINL-
ADC
DIGITAL
FILTER
WM8786
ADC
DIGITAL
FILTER
LRCLK
BCLK
DOUT
CLOCK
CIRCUITRY
MCLK
CONTROL
INTERFACE
50k 50k
http://www.cirrus.com
Copyright Cirrus Logic, Inc., 2004–2015
(All Rights Reserved)
Rev 4.4
FEB ‘15
1 page  
WM8786
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.
Cirrus 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 <30C / 85% Relative Humidity. Not normally stored in moisture barrier bag.
MSL2 = out of bag storage for 1 year at <30C / 60% Relative Humidity. Supplied in moisture barrier bag.
MSL3 = out of bag storage for 168 hours at <30C / 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
Voltage range analogue inputs
Master Clock Frequency
Operating temperature range, TA
Storage temperature after soldering
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
-40C
-65C
MAX
+3.63V
+7V
DVDD + 0.3V
AVDD +0.3V
40MHz
+85C
+150C
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Digital supply range
Analogue supply range
Ground
SYMBOL
DVDD
AVDD
DGND,AGND
TEST
CONDITIONS
MIN
TYP
MAX
UNIT
2.7 3.6 V
4.5 5.5 V
0V
Rev 4.4
5
5 Page 
WM8786
DIGITAL FILTER CHARACTERISTICS
The WM8786 digital filter characteristics scale with sample rate.
PARAMETER
TEST CONDITIONS
ADC Sample Rate (Single Rate - 48Hz typically)
Passband
+/- 0.005dB
-6dB
Passband Ripple
Stopband
Stopband Attenuation
f > 0.546fs
Group Delay
ADC Sample Rate (Dual Rate - 96kHz typically)
Passband
+/- 0.005dB
-6dB
Passband Ripple
Stopband
Stopband Attenuation
f > 0.546fs
Group Delay
ADC Sample Rate (Quad Rate - 192kHz typically)
Passband
+/- 0.005dB
-3dB
-6dB
Passband Ripple
Stopband
Stopband Attenuation
f > 0.75fs
Group Delay
ADC High Pass Filter
Corner Frequency
-3dB
-0.5dB
-0.1dB
Table 1 Digital Filter Characteristics
MIN
0
0.546fs
-85
0
0.546fs
-85
0
0.75fs
-85
TYP
0.5fs
MAX
0.454fs
+/- 0.005
32/fs
0.5fs
0.454fs
+/- 0.005
32/fs
0.45fs
0.5fs
0.25fs
+/- 0.005
10/fs
3.7
10.4
21.6
UNIT
dB
dB
s
dB
dB
s
dB
dB
s
Hz
TERMINOLOGY
1. Stop Band Attenuation (dB) - the degree to which the frequency spectrum is attenuated (outside audio band)
2. Pass-band Ripple – any variation of the frequency response in the pass-band region
HIGH PASS FILTER TRANSFER CHARACTERISTIC
The high pass filter response is defined by the following polynomial:
H(z
)
1
-
1- z-1
(1 - )z
-1
where α = 2-11 for single rate (48k) mode
α = 2-12 for dual rate (96k) mode
α = 2-13 for quad rate (192k) mode
Rev 4.4
11
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet WM8786.PDF ] | |
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