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PDF WM8785 Data sheet ( Hoja de datos )
| Número de pieza | WM8785 | |
| Descripción | Stereo ADC | |
| Fabricantes | Wolfson Microelectronics | |
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24-Bit, 192kHz Stereo ADC
WM8785
DESCRIPTION
FEATURES
The WM8785 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 has a selectable high pass
filter to remove residual DC offsets. The device also supports a
TDM bus for data out.
The device is controlled via a 2 or 3 wire serial interface. The
interface 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.
• SNR 111dB (‘A’ weighted @ 48kHz)
• THD -102dB (at -0.1dB)
• Sampling Frequency: 8 – 192kHz
• 2 or 3 Wire Microprocessor 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
• A TDM bus is supported for data out
• 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
BLOCK DIAGRAM
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Production Data, December 2006, Rev 4.1
Copyright ©2006 Wolfson Microelectronics plc
1 page  
Production Data
WM8785
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
Voltage range analogue inputs
Master Clock Frequency
Operating temperature range, TA
Storage temperature after soldering
Note: 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
-65°C
MAX
+3.63V
+7V
DVDD + 0.3V
AVDD +0.3V
40MHz
+85°C
+150°C
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Digital supply range
Analogue supply range
Ground
SYMBOL
TEST CONDITIONS MIN
TYP MAX UNIT
DVDD
2.7 3.6 V
AVDD
4.5 5.5 V
DGND,AGND
0V
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PD Rev 4.1 December 2006
5
5 Page 
Production Data
WM8785
POWER-ON RESET
The WM8785 has an internal power-on reset circuit. The reset sequence is entered at power-on or
power-up (DVDD). Until the internal reset is removed, DOUT is forced to zero. DOUT remains zero
for a count equal to 32 sample clocks, after power up. (This count is driven by MCLK and is
independent of any external LRCLK).
Figure 6 POR Circuit
Figure 7 POR Timing
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PD Rev 4.1 December 2006
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet WM8785.PDF ] | |
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