82
WM8816
Stereo Digital Volume Control
WOLFSON MICROELECTRONICS LTD
www.wolfsonmicro.com
Advanced Information, October 2001, Rev 1.2.
Copyright
2001 Wolfson Microelectronics Ltd
.
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 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.
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
Zero
Crossing
Detector
Zero
Crossing
Detector
Peak
Level
Detector
Peak
Level
Detector
CSB
MUTEB
DATA
CCLK
LGND
LIN
DAC
LFO
LMO
RIN
RGND
RFO
RMO
AVDD
AGND
DVDD
DGND
+
-
+
-
LEFT OUT
RIGHT OUT
External Opamps
Control
WM8816
WM8816
Advanced Information
AI Rev 1.2 October 2001
2
PIN CONFIGURATION
ORDERING INFORMATION
DEVICE
TEMP. RANGE
PACKAGE
XWM8816EDW
-40 to +85
o
C
16-pin SOIC (plastic)
10
9
14
13
12
11
5
6
7
1
2
3
4
CCLK
DGND
RGND
RIN
RFO
AGND
RMO
DVDD
CSB
LGND
LIN
LFO
AVDD
LMO
8
15
16
MUTEB
DATA
PIN DESCRIPTION
PIN
NAME
TYPE
DESCRIPTION
1
AVDD
Supply
Supply Voltage for Analogue Circuitry
2
LMO
Analogue Output
External Op-amp Inverting Input (Left Channel)
3
LFO
Analogue Input
External Op-amp Feedback Signal (Left Channel)
4
LIN
Analogue Input
Input Signal (Left Channel)
5
LGND
Analogue Input
Input Signal Ground (Left Channel)
6
CSB
Digital Input
Chip Select (active low)
7
DVDD
Supply
Supply Voltage for Digital Circuitry
8
MUTEB
Digital Input
Mute (active low)
9
DATA
Digital In / Out
Serial Interface Data Input / Output (tri-state)
10
CCLK
Digital Input
Serial Interface Clock
11
DGND
Supply
Digital Ground
12
RGND
Analogue Input
Input Signal Ground (Right Channel)
13
RIN
Analogue Input
Input Signal (Right Channel)
14
RFO
Analogue Input
External Op-amp Feedback Signal (Right Channel)
15
RMO
Analogue Output
External Op-amp Inverting Input (Right Channel)
16
AGND
Supply
Analogue Ground
WM8816
Advanced Information
AI Rev 1.2 October 2001
2
PIN CONFIGURATION
ORDERING INFORMATION
DEVICE
TEMP. RANGE
PACKAGE
XWM8816EDW
-40 to +85
o
C
16-pin SOIC (plastic)
10
9
14
13
12
11
5
6
7
1
2
3
4
CCLK
DGND
RGND
RIN
RFO
AGND
RMO
DVDD
CSB
LGND
LIN
LFO
AVDD
LMO
8
15
16
MUTEB
DATA
PIN DESCRIPTION
PIN
NAME
TYPE
DESCRIPTION
1
AVDD
Supply
Supply Voltage for Analogue Circuitry
2
LMO
Analogue Output
External Op-amp Inverting Input (Left Channel)
3
LFO
Analogue Input
External Op-amp Feedback Signal (Left Channel)
4
LIN
Analogue Input
Input Signal (Left Channel)
5
LGND
Analogue Input
Input Signal Ground (Left Channel)
6
CSB
Digital Input
Chip Select (active low)
7
DVDD
Supply
Supply Voltage for Digital Circuitry
8
MUTEB
Digital Input
Mute (active low)
9
DATA
Digital In / Out
Serial Interface Data Input / Output (tri-state)
10
CCLK
Digital Input
Serial Interface Clock
11
DGND
Supply
Digital Ground
12
RGND
Analogue Input
Input Signal Ground (Right Channel)
13
RIN
Analogue Input
Input Signal (Right Channel)
14
RFO
Analogue Input
External Op-amp Feedback Signal (Right Channel)
15
RMO
Analogue Output
External Op-amp Inverting Input (Right Channel)
16
AGND
Supply
Analogue Ground
P101 / Q501,Q502 : WM8816
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