WM8816_04 Datasheet, PDF (1/13 Pages) Wolfson Microelectronics plc – Stereo Digital Volume Control

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Stereo Digital Volume Control
WM8816
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.
BLOCK DIAGRAM
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
LIN
LGND
Zero
Crossing
Detector
Peak
Level
Detector
LFO
LMO
-
+
LEFT OUT
CSB
MUTEB
DATA
CCLK
RGND
RIN
WM8816 ^Control
DAC
Zero
Crossing
Detector
Peak
Level
Detector
AVDD
AGND
DVDD
DGND
External Opamps
+
RMO
-
RFO
RIGHT OUT
WOLFSON MICROELECTRONICS plc
www.wolfsonmicro.com
Product Preview, October 2004, Rev 1.5
Copyright 2004 Wolfson Microelectronics plc