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부품번호 | WM8816 기능 |
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기능 | Stereo Digital Volume Control | ||
제조업체 | Wolfson Microelectronics plc | ||
로고 | |||
전체 12 페이지수
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)
WM8816
Control
DAC
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: +44 (0) 131 667 9386
Fax: +44 (0) 131 667 5176
Email: [email protected]
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.
WM8816
TEST CONDITIONS
AVDD = 5.0V, AGND = 0V, TA = 25°C, unless otherwise stated.
PARAMETER
SYMBOL TEST CONDITIONS
MIN
Audio Performance
Noise (Note 1)
Gain = 0dB
VIN = 0V, VOUT with OP275,
A-weighed
N Gain = -60dB
Gain = mute
Total Harmonic Distortion plus
Noise
THD+N
VIN= 1Vrms, gain=0dB,
VOUT with OP275,
DC to 20 kHz
Dynamic Range (Note 1)
DR
120
Crosstalk (Note 1)
CR
Between channels,
-100
Digital Inputs / Outputs
gain=0dB, fIN=1kHz
Input low voltage
VIL All digital inputs
Input high voltage
VIH All digital inputs 0.7 DVDD
Output low voltage
VOL ILoad = 2mA
Output high voltage
Control Interface Timing
VOH
ILoad = 2mA
DVDD -0.4
Clock Frequency
Period of CCLK high
fCCLK
tWHC
VIH to VIH
500
Period of CCLK low
Rise time of CCLK
Fall time of CCLK
Hold time, CCLK high to CSB low
Setup time, CSB low to CCLK
high
tWLC
tRC
tFC
tHCHS
tSSLCH
VIL to VIL
VIL to VIH
VIH to VIL
500
20
100
Setup time, valid DATA to CCLK
high
tSDCH
100
Hold time, CCLK high to invalid
DATA
tHCHD
100
Setup time, CCLK low to valid
DATA
Hold time, CSB high or 16th
CCLK low to invalid DATA
Hold time, 16th CCLK high to
CSB high
tDCLD
tDSZ
tHLCHS
Load = 100pF
Load = 3.3kΩ
20
200
Setup time, CSB high to CCLK
high
tSSHCH
200
Note:
1. Guaranteed by design.
TYP
4
2.5
0.001
(100)
130
-110
Advanced Information
MAX
13
UNIT
µV rms
%
(dB)
dB
dB
0.3 DVDD
0.4
1
100
100
200
200
V
V
V
V
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
WOLFSON MICROELECTRONICS LTD
AI Rev 1.1 September 2000
4
4페이지 Advanced Information
REGISTER MAP
REGISTER
Peak Detector Status
CR4
ADDRESS BYTE BITS
76543210
X 1 0 1 1 R/W X X
Peak Detector
Reference
CR3
X 1 1 0 0 R/W X X
Left Channel Gain
CR2
X 1 1 0 1 R/W X X
Right Channel Gain
CR1
X 1 1 1 0 R/W X X
Test, CR5
Both Channel Gains
X 1 1 1 1 R/W X X
X 1 0 0 1WX X
Table 1 Register Map Description
WM8816
DATA BYTE
MSB…LSB
Function
Output code
00000000
No overload
00000001
Right overload
00000010
Left overload
00000011
Both overload
Input code
DAC output
11111111
255/256 × 18V
11111110
254/256 × 18V
11111101
253/256 × 18V
::
00000010
2/256 × 18V
00000001
1/256 × 18V
00000000
AGND
Input code
Gain dB
11111111
+15.5
11111110
+15.0
11111101
+14.5
::
11100000
0.0
00000010
-111.0
00000001
-111.5
00000000
mute
Input code
Gain dB
11111111
+15.5
11111110
+15.0
11111101
+14.5
::
11100000
0.0
00000010
-111.0
00000001
-111.5
00000000
mute
Reserved
Write to both gain registers
Notes:
1. Address bit 2 is the read / write bit (1 for read, 0 for write).
2. X are don’t cares, set to 1 for minimum power consumption.
3. All registers are set to their default value (all zeros) during power-on reset, except CR3 which is set to 255.
WOLFSON MICROELECTRONICS LTD
AI Rev 1.1 September 2000
7
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부품번호 | 상세설명 및 기능 | 제조사 |
WM8816 | Stereo Digital Volume Control | Wolfson Microelectronics plc |
WM8816-MICRO-EV1M | Micro-Controller Board User Handbook | Wolfson Microelectronics |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |