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WM8741, WM8742, WM8746

Table of contents:
Info of WM8741
Info of WM8742
Info of WM8746

WM8741, WM8742, WM8746 Selling Leads, Datasheet

MFG:WOLFSON Package Cooled:stock D/C:09+

WM8741, WM8742, WM8746 Datasheet download

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Part Number: WM8741

MFG: WOLFSON

Package Cooled: stock

D/C: 09+

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WM8741 General 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 bitstream 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 ccessed by hardware control interface.

The WM8741 is available in a convenient 28-SSOP package, and is pin compatible with the WM8740.

WM8741 Maximum Ratings

CONDITION	MIN	MAX
Digital supply voltage, DVDD	-0.3V	+4.5V
Analogue supply voltage, AVDD	-0.3V	+7V
Voltage range digital inputs	DGND - 0.3V	DVDD + 0.3V
Voltage range analogue inputs	AGND - 0.3V	AVDD + 0.3V
Master Clock Frequency		38.462MHz
Operating temperature range, T_A	-25	+85
Storage temperature	-65	+150
Ambient temperature (supplies applied)	-55	+125
Pb free package body temperature (soldering 10 seconds)		+260
Pb free package body temperature (soldering 2 minutes)		+183

Notes:
1. Analogue and digital grounds must always be within 0.3V of each other.

WM8741 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, 3.0V to 3.6V digital supply operation
• 28-lead SSOP Package

WM8741 Typical Application

• Professional audio systems
• CD, DVD, SACD audio
• Home theatre systems
• A/V receivers

WM8741 Connection Diagram

WM8746 General Description

WM8746 is a high performance 6-channel DAC designedfor audio applications such as DVD, home theatre systems,and digital TV. The WM8746 supports data input wordlengths from 16 to 32-bits and sampling rates up to 192kHz.The WM8746 can convert up to 6 channels at sample ratesfrom 8 to 192kHz. Additionally WM8746 supports 2channels at 192kHz and 4 channels at 96kHzsimultaneously.

The WM8746 consists of a serial interface port, digitalinterpolation filters, multi-bit sigma delta modulators and 6DACs in a small 28-pin SSOP package. The WM8746 alsoincludes a digitally controllable mute and attenuator functionon each channel.

The WM8746 supports a variety of connection schemes foraudio DAC control. The serial control interface providesaccess to a wide range of featuresincluding on-chip mute,attenuation and phase reversal. A hardware controllableinterface is also available. It is pin-compatible with theWM8736, (apart from RSTB pin which is typically unused).The WM8746 is an ideal device to interface to AC-3,DTS, and MPEG audio decoders for surround soundapplications, or for use in "universal" high definition audioplayers supporting DVD-A formats.

WM8746 Maximum Ratings

CONDITION	MIN	MAX
Digital supply voltage	-0.3V	+7V
Analogue supply voltage	-0.3V	+7V
Voltage range digital inputs	DGND -0.3V	DVDD +0.3V
Voltage range analogue inputs	AGND -0.3V	AVDD +0.3V
Master Clock Frequency		37MHz
Operating temperature range, T_A	-25°C	+85°C
Storage temperature prior to soldering	30°C max / 85% RH max
Storage temperature	-65°C	+150°C
Storage temperature		+240°C
Package body temperature (soldering 2 minutes)		+183°C

WM8746 Features

• 6-Channel DAC
• Audio Performance− 106dB SNR ('A' weighted @ 48kHz) DAC− -96dB THD
• DAC Sampling Frequency: 8kHz 192kHz
• 3-Wire Serial Control Interface
• Programmable Audio Data Interface Modes− I2S, Left, Right Justified or DSP− 16/20/24/32 bit Word Lengths
• Independent Digital Volume Control on Each Channel with127.5dB Range in 0.5dB Steps
• 3.0V 5.5V Supply Operation
• 28-Pin SSOP Package
• Exceeds Dolby Class A Performance Requirements
• Pin Compatible with WM8736

WM8746 Typical Application

• DVD and DVD 'Universal' Players
• Home theatre systems
• Digital broadcast receivers

WM8746 Connection Diagram

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