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PDF WM8741 Data sheet ( Hoja de datos )

Número de pieza WM8741
Descripción 24-bit 192kHz DAC
Fabricantes Wolfson Microelectronics 
Logotipo Wolfson Microelectronics Logotipo



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WM8741
24-bit 192kHz DAC with Advanced Digital Filtering
DESCRIPTION
The WM8741 is a very high performance stereo DAC
designed for audio applications such as professional
recording systems, A/V receivers and high specification CD,
DVD and home theatre systems. The device supports PCM
data input word lengths from 16 to 32-bits and sampling
rates up to 192kHz. The WM8741 also supports DSD bit-
stream data format, in both direct DSD and PCM-converted
DSD modes.
The WM8741 includes fine resolution volume and soft mute
control, digital de-emphasis and a range of advanced digital
filter responses, followed by a digital interpolation filter,
multi-bit sigma delta modulator and stereo DAC. Wolfson’s
patented architecture optimises the linearity of the DAC and
provides maximum insensitivity to clock jitter.
The digital filters include several selectable roll-off and
performance characteristics. The user can select between
standard sharp or slow roll-off responses. In addition, the
WM8741 includes a selection of advanced digital filter
characteristics including non-half band filters and minimum
phase filters.
This flexibility provides a range of benefits, such as
significantly reduced pre-ringing and minimal group delay.
The internal digital filters can also be by-passed and the
WM8741 used with an external digital filter.
The WM8741 supports two connection schemes for audio
DAC control. The 2/3 wire serial control interface provides
access to all features. A range of features can also be
accessed by hardware control interface.
The WM8741 is available in a convenient 28-SSOP
package, and is pin compatible with the WM8740.
FEATURES
Advanced Ultra High Performance Multi-bit Sigma-Delta
Architecture
128dB SNR (‘A’-weighted mono @ 48kHz)
125dB SNR (‘A’-weighted stereo @ 48kHz)
123dB SNR (non-weighted stereo @ 48kHz)
-100dB THD @ 48kHz
Differential analogue voltage outputs
High tolerance to clock jitter
PCM Mode
Sampling frequency: 32kHz to 192kHz
Input data word length support: 16 to 32-bit
Supports all standard audio interface formats
Selectable advanced digital filter responses
Includes linear/minimum phase and range of
tailored characteristics
Enables low pre-ringing, minimal latency
Optional interface to industry standard external filters
Digital volume control in 0.125dB steps with soft ramp
and soft mute
Anti-clipping mode to prevent distortion even with input
signals recorded up to 0dB
Selectable de-emphasis support
Zero Flag output
DSD Mode
DSD bit-stream support for SACD applications
Support for normal or phase modulated bit-streams
Direct or PCM converted DSD paths (DSD Plus)
DSD mute
Hardware or software control modes:
2 and 3 wire serial control interface support
Pin compatible with WM8740
4.5V to 5.5V analogue, 3.15V to 3.6V digital supply
operation
28-lead SSOP Package
APPLICATIONS
Professional audio systems
CD, DVD, SACD audio
Home theatre systems
A/V receivers
WOLFSON MICROELECTRONICS plc
Production Data, February 2013, Rev 4.3
Copyright 2013 Wolfson Microelectronics plc

1 page




WM8741 pdf
Production Data
WM8741
PIN DESCRIPTION (SOFTWARE CONTROL MODE)
PIN NAME
TYPE
PCM MODE
DESCRIPTION
8FS PCM MODE
DSD MODES
1
LRCLK /
Digital input Audio interface left/right Audio interface left/right DSD left audio data in
DSDL
clock input
clock input
2
DIN /
Digital input Audio interface data input Audio interface left data Unused
DINL
input
3
BCLK /
Digital input Audio interface bit clock Audio interface bit clock 64fs system clock input
DSD64CLK
input
input
4
FSEL /
Digital input Unused
DINR
Tri-level
Audio interface right data Unused
input
5
MCLK
Digital input Master clock input
Master clock input
Unused
6
DIFFHW
Digital input Differential mono mode Differential mono mode Differential mono mode
Internal pull- selection
selection
selection
down
0 = normal operation
0 = normal operation
0 = normal operation
1 = differential mono
mode
1 = differential mono
mode
1 = differential mono
mode
7 DGND
Supply
Digital ground
Digital ground
Digital ground
8 DVDD
Supply
Digital supply
Digital supply
Digital supply
9
AVDDR
Analogue Input Right analogue positive Right analogue positive Right analogue positive
reference
reference
reference
10
AGNDR
Analogue Input Right analogue negative Right analogue negative Right analogue negative
reference
reference
reference
11 VMIDR
Analogue
Output
Right analogue midrail
decoupling pin
Right analogue midrail
decoupling pin
Right analogue midrail
decoupling pin
12 VOUTRP
Analogue
Output
Right DAC positive
output
Right DAC positive
output
Right DAC positive
output
13 VOUTRN
Analogue
Output
Right DAC negative
output
Right DAC negative
output
Right DAC negative
output
14 AGND
Supply
Analogue ground
Analogue ground
Analogue ground
15 AVDD
Supply
Analogue supply
Analogue supply
Analogue supply
16 VOUTLN
Analogue
Left DAC negative output Left DAC negative output Left DAC negative output
Output
17 VOUTLP
Analogue
Left DAC positive output Left DAC positive output Left DAC positive output
Output
18 VMIDL
Analogue
Output
Left analogue midrail
decoupling pin
Left analogue midrail
decoupling pin
Left analogue midrail
decoupling pin
19
AGNDL
Analogue Input Left analogue negative
Left analogue negative
Left analogue negative
reference
reference
reference
20
AVDDL
Analogue Input Left analogue positive
Left analogue positive
Left analogue positive
reference
reference
reference
21
ZFLAG
Digital Output Zero flag output
Zero flag output
Zero flag output
22 OSR/DSDR Digital input Unused
Unused
Tri-level
23 IWO /
Digital
Buffered audio interface Unused
DOUT
input/output data output
DSD right audio data in
Unused
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PD, Rev 4.3, February 2013
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WM8741 arduino
Production Data
WM8741
TEST CONDITIONS
AVDD = 5V, DVDD = 3.3V, AGND, DGND = 0V, TA = +25oC, 1kHz test signal, fs = 48kHz, MCLK = 512fs unless otherwise
stated.
PARAMETER
Internal Analogue Filter
Bandwidth
Passband edge response
Analogue Output Levels
PCM full scale differential
output level
DSD Direct differential
output level
DSD Plus differential output
level
Minimum resistance load
SYMBOL
TEST CONDITIONS
-3dB
20kHz
Into 10kload, 0dBFS input
Into 10kload, 0dBDSD input
Into 10kload, 0dBDSD input
To midrail or AC coupled
MIN
TYP
MAX
UNIT
474
-0.0077
kHz
dB
2
0.948
0.991
VRMS
VRMS
VRMS
2 k
Maximum capacitance load
Output DC level
Reference Levels
Potential divider resistance
Voltage at VMIDL/VMIDR
AVDD to VMIDL/VMIDR and
VMIDL/VMIDR to AGND
1
AVDD/2
10
AVDD/2
Notes:
1. Ratio of output level with 1kHz full scale input, to the output level with all zeros into the digital input, measured ‘A’
weighted over a 20Hz to 20kHz bandwidth.
2. All performance measurements done with 20kHz low pass filter. Failure to use such a filter will result in higher THD
and lower SNR and Dynamic Range readings than are found in the Electrical Characteristics. The low pass filter
removes out of band noise; although it is not audible it may affect dynamic specification values.
nF
V
k
V
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PD, Rev 4.3, February 2013
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