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PDF WM9714L Data sheet ( Hoja de datos )
| Número de pieza | WM9714L | |
| Descripción | AC 97 Audio CODEC | |
| Fabricantes | Wolfson Microelectronics | |
| Logotipo |  |
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AC’97 Audio CODEC
WM9714L
DESCRIPTION
FEATURES
The WM9714L is a highly integrated input/output device
designed for mobile computing and communications.
The chip is architected for dual CODEC operation, supporting
Hi-Fi stereo Codec functions via the AC link interface, and
additionally supporting voice Codec functions via a PCM type
Synchronous Serial Port (SSP). A third, auxiliary DAC is
provided which may be used to support generation of
supervisory tones, or ring-tones at different sample rates to the
main codec.
• AC’97 Rev 2.2 compatible stereo codec
- DAC SNR 94dB, THD –85dB
- ADC SNR 87dB, THD –86dB
- Variable Rate Audio, supports all WinCE sample rates
- Tone Control, Bass Boost and 3D Enhancement
• On-chip 45mW headphone driver
• On-chip 400mW mono or stereo speaker drivers
• Stereo, mono or differential microphone input
- Automatic Level Control (ALC)
- Mic insert and mic button press detection
The device can connect directly to mono or stereo
microphones, stereo headphones and a stereo speaker,
reducing total component count in the system. Cap-less
connections to the headphones, speakers, and earpiece may be
used, saving cost and board area. Additionally, multiple analog
input and output pins are provided for seamless integration with
analog connected wireless communication devices.
• Auxiliary mono DAC (ring tone or DC level generation)
• Seamless interface to wireless chipset
• Additional PCM/I2S interface to support voice CODEC
• PLL derived audio clocks.
• Supports input clock ranging from 2.048MHz to 78.6MHz
• 1.8V to 3.6V supplies (digital down to 1.62V, speaker up to
4.2V)
• 7x7mm 48-lead QFN package
All device functions are accessed and controlled through a
single AC-Link interface compliant with the AC’97 standard. APPLICATIONS
The 24.576 MHz masterclock can be input directly or generated
internally from a 13MHz (or other frequency) clock by an on-chip • Personal Digital Assistants (PDA) with or without phone
PLL. The PLL supports a wide range of input clock from • Smartphones
2.048MHz to 78.6MHz.
www.DataShee•t4UH.coamndheld and Tablet Computers
The WM9714L operates at supply voltages from 1.8V to 3.6V.
Each section of the chip can be powered down under software
control to save power. The device is available in a small
leadless 7x7mm QFN package, ideal for use in hand-held
portable systems.
BLOCK DIAGRAM
WOLFSON MICROELECTRONICS plc
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Pre-Production, June 2006, Rev 3.0
Copyright 2006 Wolfson Microelectronics plc
1 page  
Pre-Production
WM9714L
PIN DESCRIPTION
PIN NAME
TYPE
DESCRIPTION
1 DBVDD
Supply
Digital I/O Buffer Supply
2 MCLKA
Digital Input Master Clock A Input
3 MCLKB / GPIO6 / (ADA / MASK) Digital In/Out Master Clock B Input / GPIO6 / (ADA output / MASK input)
4 DGND1
Supply
Digital Ground (return path for both DCVDD and DBVDD)
5 SDATAOUT
Digital Input Serial Data Output from Controller / Input to WM9714L
6 BITCLK Digital Output Serial Interface Clock Output to Controller
7 DGND2
Supply
Digital Ground (return path for both DCVDD and DBVDD)
8 SDATAIN Digital Output Serial Data Input to Controller / Output from WM9714L
9 DCVDD
Supply
Digital Core Supply
10 SYNC
Digital Input Serial Interface Synchronisation Pulse from Controller
11 RESETB / GPIO7 Digital In / Out Reset (asynchronous, active Low, resets all registers to their
default) / GPIO7
12
AUX4 / GPIO8 / (SPDIF)
Analogue In / Out Auxiliary ADC input / GPIO8 / (SPDIF digital audio output)
13 AVDD2
Supply
Analogue Supply
14 NC Analogue Input Do not connect
15 NC Analogue Input Do not connect
16 NC Analogue Input Do not connect
17 NC Analogue Input Do not connect
18 AGND3
Supply
Analogue Ground
19 PCBEEP Analogue Input Line Input to analogue audio mixers, typically used for beeps
20 MONOIN Analogue Input Mono Input (RX)
21 MIC1 Analogue Input Microphone preamp A input 1
22 MICCM Analogue Input Microphone common mode input
23 LINEL Analogue Input Left Line Input
24 LINER Analogue Input Right Line Input
25 AVDD
Supply
Analogue Supply (audio DACs, ADCs, PGAs, mic amps, mixers)
26 AGND
Supply
Analogue Ground
27
VREF
Analogue Output Internal Reference Voltage (buffered CAP2)
28
MICBIAS
Analogue Output Bias Voltage for Microphones (buffered CAP2 × 1.8)
29 MIC2A / COMP1 / AUX1 Analogue Input Microphone preamp A input 2 / COMP1 input / Auxillary ADC input
30 MIC2B / COMP2 / AUX2 Analogue Input Microphone preamp B input / COMP2 input / Auxillary ADC input
31 MONO Analog output Mono output driver (line or headphone)
32
CAP2
Analogue In / Out Internal Reference Voltage (normally AVDD/2, if not overdriven)
33
OUT4
Analogue Output Auxillary output driver (speaker, line or headphone)
34 SPKGND
Supply
Speaker ground (feeds output buffers on pins 33, 35, 36 and 37)
35
SPKL
Analogue Output Left speaker driver (speaker, line or headphone)
36
SPKR
Analogue Output Right speaker driver (speaker, line or headphone)
37
OUT3
Analogue Output Auxillary output driver (speaker, line or headphone)
38 SPKVDD
Supply
Speaker supply (feeds output buffers on pins 33, 35, 36 and 37)
39 HPL Analogue Output Headphone left driver (line or headphone)
40 HPGND
Supply
Headphone ground (feeds output buffers on pins 39 and 41)
41
HPR
Analogue Output Headphone right driver (line or headphone)
42 AGND2
Supply
Analogue ground, chip substrate
43 HPVDD
Supply
Headphone supply (feeds output buffers on pins 39 and 41)
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PP Rev 3.0 June 2006
5
5 Page 
Pre-Production
WM9714L
DEVICE DESCRIPTION
INTRODUCTION
The WM9714L is a largely pin compatible upgrade to WM9712, with a PCM voice codec added. This
codec is interfaced via a PCM type audio interface which makes use of GPIO pins for connection.
It is designed to meet the mixed-signal requirements of portable and wireless smartphone systems. It
includes audio recording and playback, battery monitoring, auxiliary ADC and GPIO functions, all
controlled through a single 5-wire AC-Link interface. Additionally, PCM voice codec functions are
supported through provision of an additional voice DAC and a PCM audio serial interface.
A PLL is included to allow unrelated reference clocks to be used for generation of the AC link system
clock. Typically 13MHz or 2.048MHz references might be used as a reference.
SOFTWARE SUPPORT
The basic audio features of the WM9714L are software compatible with standard AC’97 device
drivers. However, to better support additional functions, Wolfson Microelectronics supplies custom
device drivers for selected CPUs and operating systems. Please contact your local Wolfson Sales
Office for more information.
AC’97 COMPATIBILITY
The WM9714L uses an AC’97 interface to communicate with a microprocessor or controller. The
audio and GPIO functions are largely compliant with AC’97 Revision 2.2. The following differences
from the AC’97 standard are noted:
• Pinout: The function of some pins has been changed to support device specific
features. The PHONE and PCBEEP pins have been moved to different locations
on the device package.
• Package: The default package for the WM9714L is a 7×7mm leadless QFN
package.
• Audio mixing: The WM9714L handles all the audio functions of a smartphone,
including audio playback, voice recording, phone calls, phone call recording, ring
tones, as well as simultaneous use of these features. The AC’97 mixer architecture
does not fully support this. The WM9714L therefore uses a modified AC’97 mixer
architecture with three separate mixers.
• Tone Control, Bass Boost and 3D Enhancement: These functions are implemented
in the digital domain and therefore affect only signals being played through the
audio DACs, not all output signals as stipulated in AC’97.
Some other functions are additional to AC’97:
• On-chip BTL loudspeaker driver for mono or stereo speakers
• On-chip BTL driver for ear speaker (phone receiver)
• Auxiliary mono DAC for ring tones, system alerts etc.
• Auxiliary ADC Inputs
• 2 Analogue Comparators for Battery Alarm
• Programmable Filter Characteristics for Tone Control and 3D Enhancement
• PCM interface to additional Voice DAC and existing audio ADCs
• PLL to create AC’97 system clock from unrelated reference clock input
PCM CODEC
The PCM voice codec functions typically required by mobile telephony devices are provided by an
extra voice DAC on the WM9714L, which is interfaced via a standard PCM type data interface, which
is constructed through optional use of 4 of the GPIO pins on WM9714L. The audio output data from
one or both of the audio ADCs can also be output over this PCM interface, allowing a full voice codec
function to be implemented. This PCM interface supports sample rates from 8 to 48ks/s using the
standard AC’97 master clock.
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PP Rev 3.0 June 2006
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet WM9714L.PDF ] | |
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