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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
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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
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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
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
