WM8956 Datasheet, PDF (1/80 Pages) Cirrus Logic – Hi-Fi DAC with 1W Stereo Class D Speaker Drivers

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WM8956
Hi-Fi DAC with 1W Stereo Class D Speaker Drivers and
Headphone Drivers
DESCRIPTION
FEATURES
The WM8956 is a low power, high quality stereo DAC designed
for portable multimedia applications.
Stereo class D speaker drivers provide 1W per channel into 8
loads with a 5V supply. Low leakage, excellent PSRR and
pop/click suppression mechanisms also allow direct battery
connection to the speaker supply. Flexible speaker boost
settings allow speaker output power to be maximised while
minimising other analogue supply currents.
A highly flexible input configuration for up to three stereo
sources is integrated, with a complete microphone interface.
External component requirements are drastically reduced as no
separate microphone, speaker or headphone amplifiers are
required.
Stereo 24-bit sigma-delta DACs are used with low power over-
sampling digital interpolation filters and a flexible digital audio
interface.
The master clock can be input directly or generated internally by
an onboard PLL, supporting most commonly-used clocking
schemes.
The WM8956 operates at analogue supply voltages down to
2.7V, although the digital supplies can operate at voltages down
to 1.71V to save power. The speaker supply can operate at up
to 5.5V, providing 1W per channel into 8 loads. Unused
functions can be disabled using software control to save power.
The WM8956 is supplied in a very small and thin 5x5mm QFN
package, ideal for use in hand-held and portable systems.
 DAC SNR 99dB (‘A’ weighted), THD -87dB at 48kHz, 3.3V
 Pop and click suppression
 3D Enhancement
 Stereo Class D Speaker Driver
- <0.1% THD with 1W per channel into 8 BTL speakers
- 70dB PSRR @217Hz
- 87% efficiency (1W output)
- Flexible internal switching clock
 On-chip Headphone Driver
- 40mW output power into 16 at 3.3V
- Capless mode support
- THD+N -70dB at 20mW, SNR 99dB with 16 load
 Microphone Interface
- Pseudo differential for high noise immunity
- Integrated low noise MICBIAS
 Low Power Consumption
- 16mW headphone playback (2.7V / 1.8V supplies)
 Low Supply Voltages
- Analogue 2.7V to 3.6V (Speaker supply up to 5.5V)
- Digital core and I/O: 1.71V to 3.6V
 On-chip PLL provides flexible clocking scheme
 Sample rates: 8, 11.025, 12, 16, 22.05, 24, 32, 44.1, 48
 5x5x0.9mm QFN package
APPLICATIONS
 Mobile multimedia
 Portable media / DVD players
 Games consoles
DGND
DCVDD
LINPUT3/
JD2
Jack Detect
LINPUT2
vmid
LINPUT1
RINPUT1
vmid
RINPUT2
-17.25 to +30dB,
0.75dB steps
+
-12 -> 6dB,
3dB steps,
mute
-
0, 13, 20, 29dB, mute
-12 -> 6dB,
3dB steps,
mute
+
INPUT
PGAs
W
WM8956
-
0, 13, 20, 29dB, mute
+
-17.25 to +30dB,
0.75dB steps
-12 -> 6dB,
3dB steps,
mute
+
-12 -> 6dB,
3dB steps,
mute
RINPUT3/
JD3
MICBIAS
Jack Detect
50K 50K
DACREF
DBVDD
0 to -21dB,
3dB steps
0 to -21dB,
3dB steps
DAC DIGITAL FILTERS
DE-EMPHASIS
3D ENHANCE
VOLUME
DAC
DAC
DIGITAL AUDIO
INTERFACE
A-law and u-law support
0 to -21dB,
3dB steps
0 to -21dB,
3dB steps
GPIO1
PLL
LEFT
MIXER
MONO
MIXER
CLASS D
SPKVDD1
SPKVDD2
SPK_LP
-73 to 6dB
1dB steps,
mute
+BOOST
SPK_LN
-73 to 6dB
1dB steps,
mute
0dB / -6dB
HP_L
OUT3
RIGHT
MIXER
HP_R
-73 to 6dB
1dB steps,
mute
CLASS D
SPK_RN
CONTROL
INTERFACE
-73 to 6dB
1dB steps,
mute
+BOOST
SPK_RP
SPKGND1
SPKGND2
WOLFSON MICROELECTRONICS plc
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Production Data, November 2011, Rev 4.1
Copyright 2011 Wolfson Microelectronics plc