WM8816

w Stereo Digital Volume Control DESCRIPTION The WM8816 is a highly linear stereo volume control for audio systems. The design is based on resistor chains with external op-amps, which provides flexibility for the supply voltage, signal swing, noise floor and cost optimisation. The gain of each channel can be independently programmed from -111.5dB to +15.5dB through a digital serial control interface. Audible clicks on gain changes are eliminated by changing gains only when a zero crossing has been detected in the signal. The device also features peak level detection, which can be used for Automatic Gain Control. The WM8816 operates from a single +5V supply and accepts signal input levels up to ±18V. The WM8816 is available in a 16-pin SOIC package. It is guaranteed over a temperature range of -20° to +60°C. WM8816 FEATURES • • • • • • • • Gain range from -111.5dB to +15.5dB 0.5dB Gain step size Total Harmonic Distortion 0.001% (100dB) typical Crosstalk -110dB typical Input signals up to ±18V Zero Detection for Gain Changes Hardware and Software Mute Power On/Off Transient Suppression APPLICATIONS • • • • Audio Amplifiers Consumer Audio / Entertainment Systems Mixing Desks Audio Recording Equipment BLOCK DIAGRAM LFO LIN LMO LGND LEFT OUT Zero Crossing Detector Peak Level Detector + CSB MUTEB DATA CCLK External Opamps WM8816 Control DAC Zero Crossing Detector Peak Level Detector RMO + RIGHT OUT RGND - RFO RIN AVDD AGND DVDD DGND WOLFSON MICROELECTRONICS plc www.wolfsonmicro.com Product Preview, October 2004, Rev 1.5 Copyright 2004 Wolfson Microelectronics plc WM8816 TABLE OF CONTENTS Product Preview DESCRIPTION .......................................................................................................1 FEATURES.............................................................................................................1 APPLICATIONS .....................................................................................................1 BLOCK DIAGRAM .................................................................................................1 PIN CONFIGURATION...........................................................................................3 ORDERING INFORMATION ..................................................................................3 PIN DESCRIPTION ................................................................................................3 ABSOLUTE MAXIMUM RATINGS.........................................................................4 RECOMMENDED OPERATING CONDITIONS .....................................................4 ELECTRICAL CHARACTERISTICS ......................................................................5 CONTROL INTERFACE TIMING DIAGRAM ................................................................. 6 REGISTER MAP ........................................................................................................... 8 PERFORMANCE GRAPHS....................................................................................9 RECOMMENDED EXTERNAL COMPONENTS ..................................................10 RECOMMENDED EXTERNAL COMPONENTS VALUES ........................................... 10 APPLICATION RECOMMENDATIONS ....................................................................... 11 PACKAGE DIMENSIONS ....................................................................................12 IMPORTANT NOTICE ..........................................................................................13 ADDRESS: .................................................................................................................. 13 w Rev 1.5 October 2004 2 Product Preview WM8816 PIN CONFIGURATION AVDD LMO LFO LIN LGND CSB DVDD MUTEB 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 AGND RMO RFO RIN RGND DGND CCLK DATA ORDERING INFORMATION DEVICE XWM8816EDW/V XWM8816GEDW/V TEMPERATURE RANGE -20 to +60oC -20 to +60oC PACKAGE 16-pin SOIC (plastic) Wide 16-pin SOIC Wide (Lead Free) MOISTURE SENSITIVITY LEVEL MSL3 MSL3 PEAK SOLDERING TEMPERATURE 240°C 260°C PIN DESCRIPTION PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 NAME AVDD LMO LFO LIN LGND CSB DVDD MUTEB DATA CCLK DGND RGND RIN RFO RMO AGND TYPE Supply Analogue Output Analogue Input Analogue Input Analogue Input Digital Input Supply Digital Input Digital In / Out Digital Input Supply Analogue Input Analogue Input Analogue Input Analogue Output Supply DESCRIPTION Supply Voltage for Analogue Circuitry External Op-amp Inverting Input (Left Channel) External Op-amp Feedback Signal (Left Channel) Input Signal (Left Channel) Input Signal Ground (Left Channel) Chip Select (active low) Supply Voltage for Digital Circuitry Mute (active low) Serial Interface Data Input / Output (tri-state) Serial Interface Clock Digital Ground Input Signal Ground (Right Channel) Input Signal (Right Channel) External Op-amp Feedback Signal (Right Channel) External Op-amp Inverting Input (Right Channel) Analogue Ground w PP Rev 1.5 October 2004 3 WM8816 ABSOLUTE MAXIMUM RATINGS Product Preview 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 susceptible to damage from excessive static voltages. To optimise the distortion and noise performance of pins 3, 4, 13 and 14, the on-chip ESD protection circuitry has been restricted, and consequently only achieves 300V when characterised to the Human Body Model. 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