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WM8985 Schematic ( PDF Datasheet ) - Wolfson Microelectronics

Teilenummer WM8985
Beschreibung Multimedia CODEC
Hersteller Wolfson Microelectronics
Logo Wolfson Microelectronics Logo 




Gesamt 30 Seiten
WM8985 Datasheet, Funktion
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WM8985
Multimedia CODEC with Class D Headphone and Line Out
DESCRIPTION
FEATURES
The WM8985 is a low power, high quality, feature-rich stereo
CODEC designed for portable multimedia applications that
require low power consumption and high quality audio.
The device integrates preamps for stereo differential mics, and
includes class D and class AB drivers for headphone and
differential or stereo line output. External component
requirements are reduced as no separate microphone or
headphone amplifiers are required.
Advanced DSP features include a 5-band equaliser, an
ALC/limiter for the microphone or line input through the ADC
and a digital playback limiter. Additional digital filtering options
are available in the ADC path, to cater for application filtering
such as ‘wind noise reduction’ and a programmable notch filter.
Highly flexible mixers enable many new application features,
with the option to record and playback any combination of voice,
line inputs and digital audio such as FM Radio or MP3.
The WM8985 digital audio interface can operate in master or
slave mode, while an integrated PLL provides flexible clocking
schemes.
The WM8985 operates at analogue supply voltages from 2.5V to
3.3V, although the digital core can operate at voltages down to
1.71V to save power. Additional power management control
enables individual sections of the chip to be powered down
under software control.
Stereo CODEC:
DAC SNR 98dB, THD -84dB (‘A’ weighted @ 48kHz)
ADC SNR 92.5dB, THD -83dB (‘A’ weighted @ 48kHz)
Headphone driver with ‘capless’ option
- 40mW/channel output power into 16/ 3.3V AVDD2
- Class D headphone driver
- Class AB headphone / line Driver
- PSRR 70dB at 217Hz
Stereo, mono or differential line output
Mic Preamps:
Stereo differential or mono microphone interfaces
Programmable preamp gain
Pseudo differential inputs with common mode rejection
Programmable ALC / Noise Gate in ADC path
Low-noise bias supplied for electret microphones
Other Features:
Enhanced 3-D function for improved stereo separation
Digital playback limiter
5-band Equaliser (record or playback)
Programmable ADC High Pass Filter (wind noise reduction)
Programmable ADC Notch Filter
Aux inputs for stereo analog input signals or ‘beep’
PLL supporting various clocks between 8MHz-50MHz
Sample rates supported (kHz): 8, 11.025, 16, 12, 16, 22.05,
24, 32, 44.1, 48
Low power, low voltage
2.5V to 3.6V analogue supplies
1.71V to 3.6V digital supplies
5x5mm 32-lead QFN package
APPLICATIONS
Portable audio player / FM radio
Multimedia Mobile Handsets
WOLFSON MICROELECTRONICS plc
Production Data, February 2013, Rev 4.7
Copyright 2013 Wolfson Microelectronics plc






WM8985 Datasheet, Funktion
WM8985
Production Data
PIN DESCRIPTION
PIN NAME
TYPE
DESCRIPTION
1 LIP
2 LIN
Analogue Input
Analogue Input
Left MIC pre-amp positive input
Left MIC pre-amp negative input
3 L2/GPIO2
4 RIP
Analogue Input
Analogue Input
Left channel line input/secondary mic pre-amp positive input/GPIO2 pin
Right MIC pre-amp positive input
5 RIN
Analogue Input
Right MIC pre-amp negative input
6 R2/GPIO3
Analogue Input
Right channel line input/secondary mic pre-amp positive input/GPIO3 pin
7
LRC
Digital Input / Output DAC and ADC sample rate clock
8
BCLK
Digital Input / Output Digital audio bit clock
9 ADCDAT
Digital Output
ADC digital audio data output
10 DACDAT
11 MCLK
Digital Input
Digital Input
DAC digital audio data input
Master clock input
12 DGND
13 DCVDD
14 DBVDD
Supply
Supply
Supply
Digital ground
Digital core logic supply
Digital buffer (I/O) supply
15
CSB/GPIO1
Digital Input / Output 3-Wire control interface chip Select / GPIO1 pin
16 SCLK
Digital Input
3-Wire control interface clock input / 2-wire control interface clock input
17
SDIN
Digital Input / Output 3-Wire control interface data input / 2-Wire control interface data input
18 MODE
Digital Input
Control interface selection
19 AUXL
20 AUXR
21 OUT4
Analogue Input
Analogue Input
Analogue Output
Left auxiliary input
Right auxiliary input
Right line output / mono mix output
22 OUT3
23 ROUT2
Analogue Output
Analogue Output
Left line output
Class D or class AB headphone output right
24 AGND2
25 LOUT2
Supply
Analogue Output
Analogue ground (ground reference for ROUT2/LOUT2 and OUT3/OUT4)
Class D or class AB headphone output left
26 AVDD2
27 VMID
28 AGND1
Supply
Reference
Supply
Analogue supply (feeds output amplifiers ROUT2/LOUT2 and OUT3/OUT4)
Decoupling for ADC and DAC reference voltage
Analogue ground (ground reference for all input amplifiers, PLL, ADC and
DAC, internal bias circuits, output amplifiers LOUT1, ROUT1)
29 ROUT1
30 LOUT1
Analogue Output
Analogue Output
Class AB headphone or line output right
Class AB headphone or line output left
31 AVDD1
Supply
Analogue supply (feeds all input amplifiers, PLL, ADC and DAC, internal
bias circuits, output amplifiers LOUT1, LOUT2))
32 MICBIAS
Analogue Output
Microphone bias
Note:
It is recommended that the QFN ground paddle should be connected to analogue ground on the application PCB. Refer to
the application note WAN_0118 on “Guidelines on How to Use QFN Packages and Create Associated PCB Footprints”.
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PD, Rev 4.7, February 2012
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WM8985 pdf, datenblatt
WM8985
Production Data
Test Conditions
DCVDD=1.8V, AVDD1=AVDD2=DBVDD=3.3V, TA = +25oC, 1kHz signal, fs = 48kHz, 24-bit audio data unless otherwise stated.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
DAC to left and right mixer into headphone 16load on LOUT2 and ROUT2, Class AB mode
LOUT2VOL, ROUT2VOL, DACLVOL and DACRVOL = 0dB
Full-scale output
Signal to Noise Ratio 3
SNR
A-weighted
AVDD1/3.3
90 97
Vrms
dB
AVDD1=AVDD2=3.3V
22Hz to 20kHz
95.5
dB
AVDD1=AVDD2=3.3V
Total Harmonic Distortion 4
THD
Po = 20mW, RL=16
-80 -75 dB
Total Harmonic Distortion + Noise 5
THD+N
Po = 20mW, RL=16
-77 -70 dB
Channel Separation 6
1kHz signal
100 dB
DAC to left and right mixer into headphone 16load on LOUT2 and ROUT2, Class D mode, Lfilter = 33uH Cfilter = 220nf
LOUT2VOL, ROUT2VOL, DACLVOL and DACRVOL = 0Db
Full-scale output
Signal to Noise Ratio 3
SNR
A-weighted
AVDD1/3.3
90 97
Vrms
dB
AVDD1=AVDD2=3.3V
Total Harmonic Distortion 4
THD
Po = 20mW, RL=16
-79 -75 dB
Channel Separation 6
1kHz signal
PWM Rise Time
PWM Fall Time
PWM Switching Frequency
DCLKDIV = 1000
Efficiency
RL = 16, tPW = 20ns,
PO = 20mW
Power Supply Rejection
PSRR
100mVpp ripple @217Hz
injected on AVDD2
Idle Current
No analogue output signal
on either channel
Bypass paths to left and right output mixers. BYPL2LMIX = 1 and BYPR2RMIX = 1
Maximum PGA gain into mixer
Gain adjusted by
BYPLMIXVOL and
BYPRMIXVOL
Minimum PGA gain into mixer
Gain adjusted by
BYPLMIXVOL and
BYPRMIXVOL
BYPLMIXVOL and BYPRMIXVOL
gain step into mixer
Guaranteed monotonic
Mute attenuation
BYPL2LMIX = 0 BYPR2RMIX
=0
Analogue outputs (LOUT1, ROUT1, LOUT2, ROUT2)
Maximum Programmable Gain
Gain adjusted by
L/ROUT1VOL and
L/ROUT2VOL
Minimum Programmable Gain
Gain adjusted by
L/ROUT1VOL and
L/ROUT2VOL
Programmable Gain step size
Guaranteed monotonic
Mute attenuation
1kHz, full scale signal
L/ROUT1MUTE = 1
L/ROUT2MUTE = 1
100
1.5
1.5
1.4
72
70
0.5
+6
-15
3
100
+6
-57
1
85
dB
ns
ns
MHz
%
dB
mA
dB
dB
dB
dB
dB
dB
dB
dB
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PD, Rev 4.7, February 2012
12

12 Page





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