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PDF WM8971L Data sheet ( Hoja de datos )
| Número de pieza | WM8971L | |
| Descripción | STEREO CODEC FOR PORTABLE AUDIO APPLLICATIONS | |
| Fabricantes | Wolfson Microelectronics plc | |
| Logotipo |  |
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WM8971L
Stereo CODEC for Portable Audio Applications
DESCRIPTION
The WM8971L is a low power, high quality stereo codec
designed for portable digital audio applications.
The device integrates complete interfaces to stereo or mono
microphones and a stereo headphone. External component
requirements are drastically reduced as no separate
microphone or headphone amplifiers are required.
Advanced on-chip digital signal processing performs
graphic equaliser, and automatic level control for the
microphone or line input.
The WM8971L can operate as a master or a slave, with
various master clock frequencies including 12 or 24MHz for
USB devices, or standard 256fs rates like 12.288MHz and
24.576MHz. Different audio sample rates such as 96kHz,
48kHz, 44.1kHz are generated directly from the master
clock without the need for an external PLL.
The WM8971L operates at supply voltages down to 1.8V,
although the digital core can operate at voltages down to
1.42V to save power, and the maximum for all supplies is
3.6 Volts. Different sections of the chip can also be powered
down under software control.
The WM8971L is supplied in a very small and thin 5x5mm
QFN package, ideal for use in hand-held and portable
systems.
BLOCK DIAGRAM
FEATURES
• DAC SNR 98dB (‘A’ weighted), THD –84dB at 48kHz, 3.3V
• ADC SNR 95dB (‘A’ weighted), THD -82dB at 48kHz, 3.3V
• Complete Stereo / Mono Microphone Interface
- Programmable ALC / Noise Gate
• On-chip 400mW BTL Speaker Driver (mono)
• On-chip Headphone Driver
- >40mW output power on 16Ω / 3.3V
- THD –80dB at 20mW, SNR 90dB with 16Ω load
- No DC blocking capacitors required (capless mode)
• Separately mixed mono output
• Digital Graphic Equaliser
• Low Power
- 7mW stereo playback (1.8V / 1.5V supplies)
- 14mW record and playback (1.8V / 1.5V supplies)
• Low Supply Voltages
- Analogue 1.8V to 3.6V
- Digital core: 1.42V to 3.6V
- Digital I/O: 1.8V to 3.6V
• 256fs / 384fs or USB master clock rates: 12MHz, 24MHz
• Audio sample rates: 8, 11.025, 16, 22.05, 24, 32, 44.1, 48,
88.2, 96kHz generated internally from master clock
• 5x5x0.9mm QFN package
APPLICATIONS
• Digital Still Cameras
• MP3 Player / Recorders
• Minidisc Player / Recorders
• Portable Digital Music Systems
WOLFSON MICROELECTRONICS plc
www.wolfsonmicro.com
Advanced Information, March 2004, Rev 3.0
Copyright 2004 Wolfson Microelectronics plc
1 page  
Advanced Information
PIN DESCRIPTION
PIN NO
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
NAME
MCLK
DCVDD
DBVDD
DGND
BCLK
DACDAT
DACLRC
ADCDAT
ADCLRC
MONOOUT
NC
ROUT1
LOUT1
HPGND
ROUT2
LOUT2
HPVDD
AVDD
AGND
VREF
VMID
MICBIAS
HPDETECT
NC
MIC
NC
RINPUT1
LINPUT1
MODE
CSB
SDIN
SCLK
TYPE
Digital Input
Supply
Supply
Supply
Digital Input / Output
Digital Input
Digital Input / Output
Digital Output
Digital Input / Output
Analogue Output
No Connect
Analogue Output
Analogue Output
Supply
Analogue Output
Analogue Output
Supply
Supply
Supply
Analogue Output
Analogue Output
Analogue Output
Analogue Input
No Connect
Analogue Input
No Connect
Analogue Input
Analogue Input
Digital Input
Digital Input
Digital Input/Output
Digital Input
WM8971L
DESCRIPTION
Master Clock
Digital Core Supply
Digital Buffer (I/O) Supply
Digital Ground (return path for both DCVDD and DBVDD)
Audio Interface Bit Clock
DAC Digital Audio Data
Audio Interface Left / Right Clock/Clock Out
ADC Digital Audio Data
Audio Interface Left / Right Clock
Mono Output
No Connect
Right Output 1 (Line or Headphone)
Left Output 1 (Line or Headphone)
Supply for Analogue Output Drivers (LOUT1/2, ROUT1/2)
Right Output 1 (Line or Headphone or Speaker)
Left Output 1 (Line or Headphone or Speaker)
Supply for Analogue Output Drivers (LOUT1/2, ROUT1/2,
MONOUT)
Analogue Supply
Analogue Ground (return path for both AVDD and MVDD)
Reference Voltage Decoupling Capacitor
Midrail Voltage Decoupling Capacitor
Microphone Bias
Headphone Plug-in Detection
No Connect
Single Ended Microphone Input
No Connect
Right Channel Input 1
Left Channel Input 1
Control Interface Selection
Chip Select / Device Address Selection
Control Interface Data Input / 2-wire Acknowledge output
Control Interface Clock Input
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AI Rev 3.0 March 2004
5
5 Page 
Advanced Information
SPEAKER OUTPUT THD VERSUS POWER
WM8971L
-10
-20
-30
-40
-50
-60
-70
0
Speaker Pow er vs THD+N (8Ohm BTL load)
AVDD=1.8V
AVDD=2.5V
AVDD=3.3V
100 200 300 400 500
Pow er (m W)
10
8
6
4
2
0
0
Speaker Power vs THD+N (8 Ohm BTL load)
AVDD=1.8V
AVDD=2.5V
AVDD=3.3V
100 200 300 400 500
Power (mW)
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AI Rev 3.0 March 2004
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet WM8971L.PDF ] | |
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