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WM8955L Schematic ( PDF Datasheet ) - Wolfson Microelectronics plc

Teilenummer WM8955L
Beschreibung STEREO DAC FOR PORTABLE AUDIO APPLICATIONS
Hersteller Wolfson Microelectronics plc
Logo Wolfson Microelectronics plc Logo 




Gesamt 30 Seiten
WM8955L Datasheet, Funktion
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WM8955L
Stereo DAC for Portable Audio Applications
DESCRIPTION
FEATURES
The WM8955L is a low power, high quality stereo DAC with
integrated headphone and loudspeaker amplifiers, designed to
reduce external component requirements in portable digital
audio applications.
The on-chip headphone amplifiers can deliver 40mW into a 16Ω
load. Advanced on-chip digital signal processing performs bass
and treble tone control.
The WM8955L can operate as a master or a slave, and
includes an on-chip PLL. It can use most master clock
frequencies commonly found in portable systems, including
USB, GSM, CDMA or PDC clocks, or standard 256fs clock
rates. Different audio sample rates such as 48kHz, 44.1kHz,
8kHz and many others are supported.
The WM8955L operates on supply voltages from 1.8V up to
3.6V, although the digital core can operate on a separate supply
down to 1.42V, saving power. Different sections of the chip can
also be powered down under software control.
The WM8955L is supplied in a very small and thin 5x5mm QFN
package, ideal for use in hand-held and portable systems.
BLOCK DIAGRAM
DAC SNR 98dB, THD -86dB (‘A’ weighted @ 48kHz, 3.3V)
On-chip 400mW BTL Speaker Driver (mono)
On-chip Headphone Driver
- 40mW output power on 16Ω / 3.3V
- SNR 96dB, THD –79dB at 20mW with 16Ω load
Stereo and Mono Line-in mix into DAC output
Separately Mixed Stereo and Mono Outputs
Digital Tone Control and Bass Boost
Low Power
- Down to 7mW for stereo playback (1.8V / 1.5V supplies)
- 10μW Shutdown Mode
Low Supply Voltages
- Analogue and Digital I/O: 1.8V to 3.6V
- Digital core: 1.42V to 3.6V
Master clocks supported: GSM, CDMA, PDC, USB or
standard audio clocks
Audio sample rates supported: 8, 11.025, 12, 16, 22.05, 24,
32, 44.1, 48, 88.2, 96kHz
32-lead QFN package, 5x5x0.9mm size, 0.5mm lead pitch
APPLICATIONS
Smartphone / Multimedia Phone
Digital Audio Player
WOLFSON MICROELECTRONICS plc
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Production Data, May 2010, Rev 4.3
Copyright ©2010 Wolfson Microelectronics plc






WM8955L Datasheet, Funktion
WM8955L
Production Data
ELECTRICAL CHARACTERISTICS
Test Conditions
DCVDD = 1.5V, AVDD = HPVDD = 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 Line-Out (L/ROUT1 with 10kΩ / 50pF load)
Signal to Noise Ratio
SNR
AVDD = 3.3V
98 dB
(A-weighted)
AVDD = 1.8V
95
Total Harmonic Distortion
THD
AVDD = 3.3V
-86 dB
AVDD = 1.8V
-82
Channel Separation
1kHz signal
100 dB
Analogue Mixer Inputs (LINEINL/R to L/ROUT1 with 10kΩ / 50pF load)
Full-scale Input Signal Level
VINFS
AVDD = 3.3V
1.0 V rms
AVDD = other
AVDD/3.3
Signal to Noise Ratio
SNR
AVDD = 3.3V
98 dB
Line-in to Line-Out
AVDD = 1.8V
95
(A-weighted)
Total Harmonic Distortion
THD
AVDD = 3.3V
-94 dB
AVDD = 1.8V
-90 dB
Input Resistance
(signal enters one mixer only)
RLINEIN
PGA gain = 0dB
PGA gain = +6dB
20.5
10.5
kΩ
Input Resistance
PGA gain = 0dB
10.25
(signal enters two mixers)
PGA gain = +6dB
5.25
MONOIN- input resistance
RMONOIN-
any gain
20 kΩ
Mute Attenuation
-91 dB
Analogue Outputs (LOUT1/2, ROUT1/2, MONOOUT)
0dB Full scale output voltage
AVDD/3.3
Vrms
Mute attenuation
1kHz, full scale signal
-94
dB
Channel Separation
-91 dB
Headphone Output (LOUT1/2, ROUT1/2 with 16 or 32Ω load)
Output Power per channel
Total Harmonic Distortion
PO
THD
Output power is very closely correlated with THD; see below.
HPVDD=1.8V, RL=32Ω
PO=5mW
0.018
-75
HPVDD=1.8V, RL=16Ω
PO=5mW
0.025
-72
HPVDD=3.3V, RL=32Ω,
PO=20mW
0.013
-78
%
dB
HPVDD=3.3V, RL=16Ω,
PO=20mW
0.011
-79
Signal to Noise Ratio
SNR
HPVDD = 3.3V
92 96
dB
(A-weighted)
HPVDD = 1.8V
95 dB
Speaker Output (LOUT2/ROUT2 with 8Ω bridge tied load, ROUT2INV=1)
Output Power
PO Output power is very closely correlated with THD; see below and graphs
Total Harmonic Distortion
THD
Po=200mW, RL=8Ω,
HPVDD=3.3V
-63
0.07
dB
%
Po=400mW, RL=8Ω
HPVDD=3.3V
-35
1.8
Signal to Noise Ratio
(A-weighted)
SNR
HPVDD=3.3V, RL=8Ω
95
dB
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PD, Rev 4.3, May 2010
6

6 Page









WM8955L pdf, datenblatt
WM8955L
AUDIO PATHS OVERVIEW
Production Data
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PD, Rev 4.3, May 2010
12

12 Page





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