wm9001 Wolfson Microelectronics plc, wm9001 Datasheet
wm9001
Available stocks
Related parts for wm9001
wm9001 Summary of contents
Page 1
... Flexible speaker boost options (requiring no additional components) allow output volume to be maximised for various SPKVDD/AVDD combinations while minimising internal power consumption. The WM9001 is available in a 3x3mm QFN package, ideal for portable systems such as mobile phones, portable navigation devices, media players, laptop computers and electronic dictionaries. ...
Page 2
... WM9001 DESCRIPTION .......................................................................................................1 FEATURES.............................................................................................................1 APPLICATIONS .....................................................................................................1 TABLE OF CONTENTS .........................................................................................2 PIN CONFIGURATION...........................................................................................3 ORDERING INFORMATION ..................................................................................3 PIN DESCRIPTION ................................................................................................4 ABSOLUTE MAXIMUM RATINGS.........................................................................5 RECOMMENDED OPERATING CONDITIONS .....................................................5 THERMAL PERFORMANCE .................................................................................6 POWER DE-RATING .............................................................................................7 ELECTRICAL CHARACTERISTICS ......................................................................8 TERMINOLOGY .....................................................................................................9 TYPICAL POWER CONSUMPTION ....................................................................10 SPEAKER DRIVER PERFORMANCE .................................................................11 CLASS D MODE .......................................................................................................... 11 CLASS AB MODE ........................................................................................................ 11 PSRR PERFORMANCE.......................................................................................12 EFFICIENCY ........................................................................................................13 AUDIO SIGNAL PATHS.......................................................................................14 DEVICE DESCRIPTION ...
Page 3
... Pre-Production PIN CONFIGURATION The WM9001 is supplied in a 3mm x 3mm 16 pin QFN package ORDERING INFORMATION DEVICE MINIMUM ORDER QUANTITY QFN 121 WM9001GEFL QFN 3500 WM9001GEFL/R w QFN TEMPERATURE PACKAGE RANGE -40°C to 85°C QFN -40°C to 85°C QFN WM9001 MOISTURE PEAK SOLDERING SENSITIVITY LEVEL ...
Page 4
... WM9001 PIN DESCRIPTION PIN NO NAME 16 INP_SEL 15 LIP LIN 12 BSEL2 11 BSEL1 10 BSEL0 9 VMID 8 AVDD 7 CDMODE 6 AGND 5 SYNC 4 VOUTN 3 SPKGND 2 SPKVDD 1 VOUTP w TYPE Digital Input Analogue Input Enable Analogue Input Digital Input Digital Input Digital Input Analogue Output Midrail voltage decoupling capacitor ...
Page 5
... The EN and SYNC pins are compatible with low voltage (eg. 1.8v) logic levels from external devices, and can accept logic 1 digital inputs as low as 1.6V, even though the WM9001 AVDD supply minimum is 2.7V. This provides compatibility with a low voltage DVDD on a controlling device such as the WM8991 CODEC. ...
Page 6
... WM9001 THERMAL PERFORMANCE Thermal analysis should be performed in the intended application to prevent the WM9001 from exceeding maximum junction temperature. Several contributing factors affect thermal performance most notably the physical properties of the mechanical enclosure, location of the device on the PCB in relation to surrounding components and the number of PCB layers. Connecting the GND pins/paddle through thermal vias and into a large ground plane will aid heat extraction ...
Page 7
... The de-rating curves in Figure 1 are based on a sinusoidal input signal delivering a maximum output power of 1W into 8Ω. P [W] w CLASS D CLASS AB SPKVDD = 5.5V SPKVDD = 5V SPKVDD = 4.2V 1.0 0.9 SPKVDD = 3.6V 0.8 SPKVDD = 3.3V 0.7 0.6 SPKVDD = 3V 0.5 SPKVDD = 2.7V 0.4 0.3 0.2 0 Figure 1 Speaker Power De-Rating Curves limit the amount of power that can [ºC] PP, June 2009, Rev 3.2 WM9001 7 ...
Page 8
... WM9001 ELECTRICAL CHARACTERISTICS Test Conditions AVDD = 3.3V; SPKVDD = 5V +25 A PARAMETER Analogue Input Pins (LIN, LIP) Maximum Full-Scale Input Signal Level Differential Mode (INP_SEL=0): This is the maximum on each input pin; the total differential input is 2x this figure. Single-Ended Mode (INP_SEL=1): This is the maximum on LIP. ...
Page 9
... Mute Attenuation – This is a measure of the difference in level between the full scale output signal and the output with mute applied 1kHz input signal, BSEL[2:0] = 000 unless otherwise stated. TEST CONDITIONS Vmid capacitor = 4.7μF Vmid capacitor = 4.7μF WM9001 MIN TYP MAX 0.7×AVDD 1.6 0.3×AVDD 10 -0 ...
Page 10
... WM9001 TYPICAL POWER CONSUMPTION MODE GAIN EN BATTERY LEAKAGE OFF 0dB EN=0, AVDD=0V 0dB 0dB 0dB 0dB STANDBY LEAKAGE OFF Standby 0dB EN=0, AVDD enabled 2.1dB 2.1dB 3.6dB 3.6dB QUIESCENT Class AB Speaker Mode 0dB 8Ω 2.1dB 2.1dB 3.6dB 3.6dB Class D Speaker Mode 0dB 8Ω ...
Page 11
... CLASS D MODE 0.001 Figure 2 Class D Speaker Performance CLASS AB MODE 0.001 Figure 3 Class AB Speaker Performance w AVDD SPKVDD 2.7V 2.7V 3.0V 3.7V 3.3V 4.2V 3.3V 5.0V WM9001 THD+N Ratio v Output Power Class 0.1 0.01 0 0.2 0.4 0.6 Output Power (W) SPKVDD=5.0V, AVDD=3.3V, Gain=3.6dB SPKVDD=3.7V, AVDD=3.0V, Gain=2.1dB WM9001 THD+N Ratio v Output Power Class ...
Page 12
... CLASS D SPKVDD PSRR WM9001 Class D SPKVDD PSRR AVDD=3.3V, SPKVDD=5. Frequency (kHz) CLASS D AVDD PSRR WM9001 Class D AVDD PSRR AVDD=3.3V, SPKVDD=5. Frequency (kHz) PP, June 2009, Rev 3.2 Pre-Production Differential Mode Single-Emded Mode Differential Mode ...
Page 13
... Pre-Production EFFICIENCY Typical Efficiency versus output power curves are provided below for both class AB and class D modes. CLASS AB WM9001 Class AB Efficiency AVDD=3.3V, SPKVDD=5.0V, BSEL[2:0]=011 (x1.52) 100 200 400 600 Output Power (mW) w 100 ...
Page 14
... WM9001 AUDIO SIGNAL PATHS The WM9001 speaker driver can operate in two modes: 1. INP_SEL=0: Takes a differential audio input and produces a differential class AB or class D output. The audio signal path is illustrated below. Figure 4 Differential Mode Audio Signal Paths 2. INP_SEL=1: Takes a single-ended audio input and produces a differential class AB or class D output ...
Page 15
... The WM9001 is a powerful mono speaker driver, which can operate in class mode, providing total flexibility to the system designer. The WM9001 can deliver 1W in class D mode, Figure class AB mode, Figure 3, into an 8Ω load. The input can be configured either as a single channel differential line output offering good noise rejection characteristics single-ended line output for systems where there is no differential option ...
Page 16
... WM9001 INPUT SIGNAL PATH The line inputs to the WM9001 are identified as LIP and LIN on the pin diagram. These are a fully balanced differential input pair, with matched impedances on both terminals. The input stage of the WM9001 is driven by the voltage difference between these two pins. This results in a very low noise amplifier stage, as any common mode noise (unwanted signals that are present in equal amplitude on both pins) are cancelled out at the input and are not reproduced at the output ...
Page 17
... Note that ACGAIN = DCGAIN for all settings. w PIN NAME 7 CDMODE PIN NAME 12,11,10 BSEL[2:0] WM9001 DESCRIPTION Class AB/D Mode Select 0 = Class D mode 1 = Class AB mode DESCRIPTION Signal Boost Control 000 = 1.00x boost (+0dB) 001 = 1.27x boost (+2.1dB) 010 = 1.40x boost (+2.9dB) 011 = 1.52x boost (+3.6dB) 100 = 1 ...
Page 18
... To protect the WM9001 from damage due to overheating, a thermal shutdown circuit is included. If the junction temperature exceeds approximately 150ºC, then the WM9001 will be disabled. Note that the internal power dissipation of the WM9001 is significantly higher in class AB mode than in class D mode – see “Power De-Rating” section. ...
Page 19
... Pre-Production APPLICATIONS INFORMATION TYPICAL STAND-ALONE USAGE The WM9001 may be used as a differential speaker amplifier, as illustrated in Figure single-ended speaker amplifier in Figure 9. Figure 8 Operation of WM9001 as Stand-alone Differential Amplifier Figure 9 Operation of WM9001 as a Stand-alone Single-ended Amplifier In the both configurations DC blocking capacitors are required on the input paths. A typical application might use 1uF capacitors for this purpose, providing a high pass cut-off frequency of less than 20Hz ...
Page 20
... WM9001 TYPICAL USAGE WITH WM8991 CODEC The WM9001 may be used in conjunction with a CODEC such as the WM8991 to provide a complete stereo solution. Such a solution allows the left and right drivers to be positioned separately as close to the speakers as possible, minimising EMI emissions from long speaker cables. ...
Page 21
... Pre-Production SPEAKER SELECTION In Class D driver mode, the WM9001 output contains high frequency signals resulting from the switched PWM operation. To avoid the need for specific filter components important to make an appropriate choice of loudspeaker. Note that, for Class AB mode usage, the choice of speaker is not so important as there are no high frequency harmonics in the WM9001 output ...
Page 22
... Figure 12 Speaker Connection Losses The distance between the WM9001 and the speakers should be kept to a minimum to reduce series resistance, and also to reduce EMI. Further reductions in EMI can be achieved by additional passive filtering and/or shielding as shown in Figure 13. When additional passive filtering is used, low ESR components should be chosen to minimise series resistance between the WM9001 and the speaker, maximising efficiency ...
Page 23
... Pre-Production EXTERNAL COMPONENTS w WM9001 PP, June 2009, Rev 3.2 23 ...
Page 24
... WM9001 PACKAGE DIMENSIONS FL: 16 PIN QFN PLASTIC PACKAGE EXPOSED GROUND PADDLE BOTTOM VIEW A3 SIDE VIEW C SEATING PLANE A3 b Exposed lead Symbols MIN A 0. 0. 0.325 Tolerances of Form and Position aaa bbb ccc REF: JEDEC, MO-220, VARIATION VGGD-2. ...
Page 25
... Wolfson is not liable for any such representations, warranties or liabilities or for any reliance placed thereon by any person. ADDRESS Wolfson Microelectronics plc Westfield House 26 Westfield Road Edinburgh EH11 2QB United Kingdom Tel :: +44 (0)131 272 7000 Fax :: +44 (0)131 272 7001 Email :: sales@wolfsonmicro.com w WM9001 PP, June 2009, Rev 3.2 25 ...