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WM8991 Schematic ( PDF Datasheet ) - Wolfson Microelectronics

Teilenummer WM8991
Beschreibung Mobile Multimedia CODEC
Hersteller Wolfson Microelectronics
Logo Wolfson Microelectronics Logo 




Gesamt 30 Seiten
WM8991 Datasheet, Funktion
www.DataSheet4U.com
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WM8991
Mobile Multimedia CODEC with
Dual-Mode Class AB/D Speaker Driver
DESCRIPTION
FEATURES
The WM8991 is a highly integrated ultra-low power hi-fi codec
designed for handsets rich in multimedia features such as
mobile TV, digital audio playback and gaming. Ultra-low power
and low noise interfaces to many other audio components in the
system are provided.
A powerful 1W speaker driver can operate in class D or AB
modes, providing total flexibility to the system designer. Low
leakage, high PSRR and pop/click suppression enable direct
battery connection for the speaker supply.
A very highly flexible input configuration supports multiple
microphone or line inputs (mono or stereo, single-ended or
differential).
Four headphone drivers support fully differential headset drive,
providing excellent crosstalk performance and bass response,
maximising stereo effects, and allowing the removal of large
and expensive headphone capacitors.
Stereo 24-bit sigma-delta ADCs and DACs provide hi-fi quality
audio record and playback, with a flexible digital audio interface
supporting most commonly-used clocking schemes. An
integrated low power PLL, an alternative DAC interface and
TDM support provide additional flexibility.
The WM8991 is supplied in very small and thin 5x5mm 65-ball
BGA package, ideal for use in portable systems.
DAC SNR 99dB (‘A’ weighted), THD -84dB at 48kHz, 3.3V
ADC SNR 94dB (‘A’ weighted), THD -82dB at 48kHz, 3.3V
Microphone interface (Up to four differential microphones)
1W Speaker driver
- 1W into 8BTL speaker at <0.1% THD
- 80dB PSRR @217Hz
- <1uA leakage with direct battery connection
- Software-selectable class D or AB mode
- Filterless connection supported
- Pop/Click suppression
Headphone / ear speaker drivers
- 40mW output power into 16at 3.3V
- Fully differential and capless modes supported
- Pop/Click suppression
4 Mono or stereo differential line outputs
Powerful GPIO functions
Ultra-low power consumption
- 8.3mW analogue voice call
- 13.7mW DAC playback to headphones
On-chip PLL provides flexible clocking scheme
Sample rates: 8, 11.025, 12, 16, 22.05, 24, 32, 44.1, 48kHz
65-ball 5x5mm BGA package
APPLICATIONS
Multimedia phones
GPS
WOLFSON MICROELECTRONICS plc
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Pre-Production, May 2008, Rev 3.1
Copyright ©2008 Wolfson Microelectronics plc






WM8991 Datasheet, Funktion
www.DataSheet4U.com
WM8991
PIN DESCRIPTION
PIN NO
B8
D1
NAME
MICBIAS
LIN1
TYPE
Analogue Output
Analogue Input
D2
LIN2
Analogue Input
C1
LIN3 /
Analogue Input /
GPI7
Digital Input
C2
LIN4 /
Analogue Input
RXN
E1
RIN1
Analogue Input
E2
RIN2
Analogue Input
F1
RIN3 /
Analogue Input /
GPI8
Digital Input
F2
RIN4 /
Analogue Input
RXP
H1 DCVDD
G1 DGND
G2
J1 DBVDD
A1 AVDD
B1
A6 AGND
B6
D4
D5
D6
E4
E5
E6
F4
F5
F6
A2 HPVDD
A3
A4 HPGND
A5
A7 SPKVDD
A8
C8 SPKGND
D8
J2 MCLK
J3 BCLK
H5 DACLRC
J5 DACDAT
H4 ADCLRC /
GPIO1
J4 ADCDAT
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Supply
Supply
Supply
Supply
Supply
Supply
Supply
Supply
Supply
Digital Input
Digital Input / Output
Digital Input / Output
Digital Input
Digital Input / Output
Digital Output
Pre-Production
DESCRIPTION
Microphone bias
Left channel single-ended MIC input /
Left channel negative differential MIC input
Left channel line input /
Left channel positive differential MIC input
Left channel line input /
Left channel negative differential MIC input /
Accessory or button detect input pin
Left channel line input /
Left channel positive differential MIC input /
Mono differential negative input (Rx voice -)
Right channel single-ended MIC input /
Right channel negative differential MIC input
Right channel line input /
Right channel positive differential MIC input
Right channel line input /
Right channel negative differential MIC input /
Accessory or button detect input pin
Left channel line input /
Left channel positive differential MIC input /
Mono differential positive input (Rx voice +)
Digital core supply
Digital ground (Return path for both DCVDD and DBVDD)
Digital buffer (I/O) supply
Analogue supply
Analogue ground (Return path for AVDD)
Note: D4 to F6 are GND_PADDLES for thermal conduction and must
be connected on the PCB for thermal reasons.
Headphone supply
Headphone ground (Return path for HPVDD)
Supply for speaker driver
Ground for speaker driver (Return path from SPKVDD)
Master clock
Audio interface bit clock
Audio interface DAC left / right clock
DAC digital audio data
Audio interface ADC left / right clock / GPIO1 pin
ADC digital audio data
PP, May 2008, Rev 3.1
6

6 Page









WM8991 pdf, datenblatt
www.DataSheet4U.com
WM8991
Pre-Production
ELECTRICAL CHARACTERISTICS
Test Conditions
DCVDD = 1.8V, DBVDD = 3.3V, AVDD = HPVDD = 3.3V, SPKVDD = 5V, TA = +25oC, 1kHz signal, fs = 48kHz,
PGA gain = 0dB, 24-bit audio data unless otherwise stated.
PARAMETER
TEST CONDITIONS
MIN
Analogue Input Pin Maximum Signal Levels (LIN1, LIN2, LIN3, LIN4, RIN1, RIN2, RIN3, RIN4)
A1 Maximum Full-Scale PGA
Single-ended PGA
Input Signal Level
input on LIN1, LIN3,
RIN1 or RIN3, output
Note 1: This changes in
to INMIXL or INMIXR
proportion to AVDD
Differential PGA input
(AVDD/3.3).
on LIN1/LIN2,
LIN3/LIN4, RIN1/RIN2
Note 2: When mixing input
PGA outputs and line
inputs the total signal
must not exceed 1Vrms
(0dBV).
or RIN3/RIN4, output
to INMIXL or INMIXR
Differential input to
two single-ended PGA
inputs on LIN1/LIN3
or RIN1/RIN3, output
Note 3: A 1.0Vrms
differential signal equates
to DIFFINL or
DIFFINR
to 0.5Vrms/-6dBV per
input.
A2 Maximum Full-Scale Line
Line input on LIN2,
Input Signal Level
LIN4, RIN2 or RIN4 to
INMIXL or INMIXR
Note 1: This changes in
proportion to AVDD
(AVDD/3.3).
Note 2: When mixing line
inputs, input PGA outputs
and DAC outputs the total
signal must not exceed
1Vrms (0dBV).
Line input on LIN2 or
RIN2 to SPKMIX
TYP
1.0
0
1.0
0
1.0
0
1.0
0
1.0
0
Note 3: A 1.0Vrms
differential signal equates
to 0.5Vrms/-6dBV per
input.
Line input on LIN3 or
RIN3 to LOMIX or
ROMIX
1.0
0
MAX
UNIT
Vrms
dBV
Vrms
dBV
Vrms
dBV
Vrms
dBV
Vrms
dBV
Vrms
dBV
Differential mono line
input on RXP/RXN to
RXVOICE
Differential mono line
input on RXP/RXN to
differential output on
OUT3/OUT4
1.0 Vrms
0 dBV
1.0 Vrms
0 dBV
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PP, May 2008, Rev 3.1
12

12 Page





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