WM8816 Datasheet, PDF (1/12 Pages) Wolfson Microelectronics plc – 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 -40° to 85°C.
WM8816
Stereo Digital Volume Control
Advanced Information, September 2000, Rev 1.1
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
LIN (4)
LGND (5)
Zero
Crossing
Detector
Peak
Level
Detector
(3) LFO
(2) LMO
-
+
LEFT OUT
CSB (6)
MUTEB (8)
DATA (9)
CCLK (10)
Control
DAC
WM8816
External Opamps
RGND (12)
RIN (13)
Zero
Crossing
Detector
Peak
Level
Detector
+
(15) RMO
-
(14) RFO
RIGHT OUT
(1)
AVDD
(16)
AGND
(7)
DVDD
WOLFSON MICROELECTRONICS LTD
Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK
Tel: [phone]
Fax: [phone]
Email: [e-mail]
http://www.wolfson.co.uk
(11)
DGND
Advanced information data sheets contain
preliminary data on new products in the
pre-production phase of development.
Supplementary data will be published at a
later date.
2000 Wolfson Microelectronics Ltd.