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PDF WM8740 Data sheet ( Hoja de datos )
| Número de pieza | WM8740 | |
| Descripción | 24-bit/ High Performance 192kHz Stereo DAC | |
| Fabricantes | Wolfson Microelectronics plc | |
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WM8740
24-bit, High Performance 192kHz Stereo DAC
DESCRIPTION
The WM8740 is a very high performance stereo DAC
designed for audio applications such as CD, DVD, home
theatre systems, set top boxes and digital TV. The WM8740
supports data input word lengths from 16 to 24-bits and
sampling rates up to 192kHz. The WM8740 consists of a
serial interface port, digital interpolation filter, multi-bit sigma
delta modulator and stereo DAC in a small 28-pin SSOP
package. The WM8740 also includes a digitally controllable
mute and attenuator function on each channel.
The internal digital filter has two selectable roll-off
characteristics. A sharp or slow roll-off can be selected
dependent on application requirements. Additionally, the
internal digital filter can be by-passed and the WM8740
used with an external digital filter.
The WM8740 supports two connection schemes for audio
DAC control. The SPI-compatible serial control port
provides access to a wide range of features including on-
chip mute, attenuation and phase reversal. A hardware
controllable interface is also available.
FEATURES
• 120dB SNR (‘A’ weighted mono @48kHz), THD+N: -104dB
@ FS
• 117dB SNR (‘A’ weighted stereo @48kHz), THD+N: -104dB
@ FS
• Sampling frequency: 8kHz to 192kHz
• Selectable digital filter roll-off
• Optional interface to industry standard external filters
• Differential mono mode needing no glue logic
• Input data word: 16 to 24-bit
• Hardware or SPI compatible serial port control modes:
- Hardware mode: mute, de-emphasis, audio format
control
- Serial mode: mute, de-emphasis, attenuation (256
steps), phase reversal
• Fully differential voltage outputs
APPLICATIONS
• CD, DVD audio
• Home theatre systems
• Professional audio systems
BLOCK DIAGRAM
WOLFSON MICROELECTRONICS plc
To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews
Production Data, April 2010, Rev 4.4
Copyright ©2010 Wolfson Microelectronics plc
1 page  
WM8740
Production Data
PIN NAME
TYPE
DESCRIPTION
Hardware Mode
Normal Mode
23 CSBIWO Digital input
Wordlength:
Internal pull-down Low for 16-bit data.
High for 20-bit
(normal) or 24-bit
I2S data.
24 MODE
Digital input
Low for hardware
Internal pull-up mode.
25 MUTEB
Digital input
Low to soft mute.
Internal pull-up
High for normal
operation.
26 MD/DM0
Digital input
De-emphasis mode
Internal pull-up select bit 0.
27 MC/DM1
Digital input
De-emphasis mode
Internal pull-up select bit 1.
28 ML/I2S
Digital input
Audio serial format:
Internal pull-up
Low – right justified.
High – I2S.
Note: Digital input pins have Schmitt trigger input buffers.
Differential Mode
Wordlength:
Low for 16-bit data.
High for 20-bit
(normal) or 24-bit
I2S data.
Low for left
mono mode.
High for right
mono mode
Low to soft mute.
High for normal
operation.
Low for no
de-emphasis.
High for 44.1kHz
de-emphasis.
Low for normal filter
operation.
High for filter slow
roll-off.
Audio serial format:
Low – right justified.
High – I2S.
8X Mode
Wordlength:
Low for 20-bit data.
High for 24-bit data.
DINR
Low to soft mute.
High for normal
operation.
LRP – LRCLK
polarity select.
Unused.
Leave unconnected.
Input data format:
Low – right justified.
High – left justified.
Software
Mode
Low for
serial
interface
operation.
High for
software
mode.
Low to
soft mute.
High for
normal
operation.
Control serial
interface
data signal.
Control serial
interface
clock signal.
Control serial
interface
load signal.
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.
CONDITION
MIN MAX
Supply voltage
-0.3V
+7.0V
Input
GND -0.3V
VDD + 0.3V
Operating temperature range, TA
Storage temperature prior to soldering
-40°C
+85°C
30°C max / 85% RH max
Storage temperature after soldering
-65°C
+150°C
Note: It is strongly recommended that AVDD, AVDDL and AVDDR are tied together. AGND, AGNDL and AGND right
must also be tied together.
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PD, Rev 4.4, April 2010
5
5 Page 
WM8740
Production Data
In a real application the designer is unlikely to have control of the relative power up sequence of
AVDD and DVDD. Using the POR circuit to monitor VMIDLL ensures a reasonable delay between
applying power to the device and Device Ready.
Figure 5 and Figure 6 show typical power up scenarios in a real system. Both AVDD and DVDD must
be established and VMIDL must have reached the threshold Vporr before the device is ready and can
be written to. Any writes to the device before Device Ready will be ignored.
Figure 5 shows DVDD powering up before AVDD. Figure 6 shows AVDD powering up before DVDD.
In both cases, the time from applying power to Device Ready is dominated by the charge time of
VMIDLL. In the case where AVDD is powered long before DVDD, thus allowing VMIDL to charge
above Vporr, the PORB will not release until DVDD passes the Vpord threshold. This situation is
shown in Figure 7.
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PD, Rev 4.4, April 2010
11
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet WM8740.PDF ] | |
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