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w wm9010 low power, class g stereo headphone driver wolfson microelectronics plc to receive regular email updates, sign up at http://www.wolfsonmicro.com/enews production data, february 2011, rev 4.0 copyright ? 2011 wolfson microelectronics plc description the wm9010 is a low power stereo headphone driver designed for mobile handset and portable media player (pmp) applications. class g amplifier technology is used to achieve high power efficiency and low quiescent current. stereo analogue inputs accept 1vrms line level inputs; the hi-fi output drivers deliver up to 28mw into a 32 ? load. an integrated charge pump circuit generates split-rail voltage supplies to power the ground-referenced headphone driver. the wm9010 incorporates wolfson silent switch? technology to provide pop and click suppression whenever the wm9010 is enabled or disabled. the wm9010 is supplied in a 12-pin csp package. features ? hi-fi audio headphone drivers (104db snr - ?a? weighted) ? stereo analogue audio inputs ? ground-referenced, cap-less headphone outputs ? integrated charge pump and oscillator circuits ? low quiescent current ? rf noise suppression ? pop and click suppression ? 12-pin csp package (1.84 x 1.34 x 0.7mm) applications ? mobile handsets ? portable media players (pmp) ? notebooks / laptop computers ? lcd televisions inl inr hpoutl hpoutr ena gnd vdd wm9010 charge pump oscillator pop and click suppression rf noise suppression inref - + - +
wm9010 production data w pd, february 2011, rev 4.0 2 table of contents description ....................................................................................................... 1 features............................................................................................................. 1 applications ..................................................................................................... 1 table of contents ......................................................................................... 2 pin configuration ........................................................................................... 3 ordering information .................................................................................. 3 pin description ................................................................................................ 3 absolute maximum ratings ......................................................................... 4 recommended operating conditions ..................................................... 4 electrical characteristics ...................................................................... 5 terminology ............................................................................................................. 6 device description ......................................................................................... 7 introduction ............................................................................................................ 7 headphone driver .................................................................................................. 7 charge pump ............................................................................................................. 8 applications information ........................................................................... 9 recommended external components ............................................................. 9 pcb layout considerations ................................................................................ 9 package dimensions .................................................................................... 10 important notice .......................................................................................... 11 address: ................................................................................................................... 11 revision history ............................................................................................ 12
production data wm9010 w pd, february 2011, rev 4.0 3 pin configuration the wm9010 is supplied in a 12-pin csp format. the pin configuration is illustrated below, showing the top-down view from above the chip. hpoutl inl 1 a c b cpvoutn gnd inr cpca ena cpcb cpvoutp hpoutr 4 3 2 ordering information order code temperature range package moisture sensitivity level peak soldering temperature wm9010ecsn/r -40 c to +85 c 12-pin csp (pb-free, tape and reel) msl1 260 o c note: reel quantity = 5000 pin description pin no name type description a1 inl analogue input left channel analogue input a2 inr analogue input right channel analogue input a3 vdd supply positive supply a4 gnd supply ground b1 inref analogue input input reference for inl and inr b2 ena digital input device enable / mute control b3 cpca analogue output charge pump fly-back capacitor pin b4 cpcb analogue output charge pump fly-back capacitor pin c1 hpoutl analogue output left headphone output c2 hpoutr analogue output right headphone output c3 cpvoutp analogue output charge pump positive supply decoupling pin c4 cpvoutn analogue output charge pump negative supply decoupling pin
wm9010 production data w pd, february 2011, rev 4.0 4 absolute maximum ratings absolute maximum ratings are stress ratings only. permanent damage to the device may be caused by continuously operating at or beyond these limits. device functional operating limits and guaranteed performance specifications are given under electrical characteristics at the test conditions specified. esd sensitive device. this device is manufactured on a cmos process. it is therefore generically susceptible to damage from excessive static voltages. proper esd precautions must be taken during handling and storage of this device. wolfson tests its package types according to ipc/jedec j-std-020b for moisture sensitivity to determine acceptable storage conditions prior to surface mount assembly. these levels are: msl1 = unlimited floor life at <30 c / 85% relative humidity. not normally stored in moisture barrier bag. msl2 = out of bag storage for 1 year at <30 c / 60% relative humidity. supplied in moisture barrier bag. msl3 = out of bag storage for 168 hours at <30 c / 60% relative humidity. supplied in moisture barrier bag. the moisture sensitivity level for each package type is specified in ordering information. condition min max supply voltage (vdd) -0.3v 2.5v voltage range digital input (ena) -0.7v 3.3v voltage range analogue inputs -0.7v vdd +0.7v operating temperature range, t a -40oc +85oc junction temperature, t jmax -40oc +150oc storage temperature after soldering -65oc +150oc recommended operating conditions parameter symbol min typ max unit supply voltage vdd 1.71 1.8 2.0 v ground gnd 0 v
production data wm9010 w pd, february 2011, rev 4.0 5 electrical characteristics test conditions vdd = 1.8v, inref = gnd = 0v, load resistance = 16 , t a = +25 o c, 1khz signal unless otherwise stated. parameter symbol test conditions min typ max unit analogue inputs (inl, inr) maximum input signal level single-ended input vdd/1.8 vrms input resistance 15 20 25 k input capacitance 3 pf headphone output path (hpoutl, hpoutr) output power p o r l = 32 ; thd+n = 0.1% 27 mw r l = 32 ; thd+n = 1% 28 r l = 16 ; thd+n = 0.1% 32 r l = 16 ; thd+n = 1% 34 signal to noise ratio snr a-weighted (20hz ? 20khz) 95 104 db total harmonic distortion + noise thd+n r l = 32 ; p o = 20mw (20hz ? 20khz) -90 db r l = 32 ; p o = 5mw (20hz ? 20khz) -91 r l = 16 ; p o = 20mw (20hz ? 20khz) -91 -81 r l = 16 ; p o = 5mw (20hz ? 20khz) -87 dc offset 0.5 2 mv channel separation r l = 16 80 87 db mute attenuation ena = 0 95 110 db power supply rejection psrr 100mv pk-pk @ 217hz on vdd 75 db maximum load capacitance hpoutl or hpoutr 2 nf digital input (ena) input high level 0.8 x vdd v input low level 0.2 x vdd v other parameters quiescent current i vdd ena = 1, inputs grounded 750 1000 a shutdown current i vdd ena = 0 0.9 2 a start-up time 13 ms
wm9010 production data w pd, february 2011, rev 4.0 6 terminology 1. signal-to-noise ratio (db) ? snr is the difference in level between a full scale output signal and the device output noise with no signal applied, measured over a bandwidth of 20hz to 20khz. (no auto-zero or mute function is employed). 2. total harmonic distortion (db) ? thd is the difference in level between a 1khz reference sine wave output signal and the sum of the harmonics of the output signal. the amplitude of the fundamental frequency of the output signal is compared to the rms value of the sum of the harmonics and expressed as a ratio. 3. total harmonic distortion plus noise (db) ? thd+n is the difference in level between a 1khz reference sine wave output signal and all noise and distortion products in the audio band. the amplitude of the fundamental reference frequency of the output signal is compared to the rms value of all other noise and distortion products and expressed as a ratio. 4. channel separation (l/r) (db) ? is a measure of the coupling between left and right channels. a full scale signal is applied to the left channel only, and the right channel amplitude is measured. next, a full scale signal is applied to the right channel only, and the left channel amplitude is measured. the worst case channel separation is quoted; this is the difference in level between the full-scale output and the cross-channel output signal level, expressed as a ratio. 5. power supply rejection ratio (db) ? psrr is a measure of ripple attenuation between a power supply rail and a signal output path. with the signal path idle, a small sine wave ripple is applied to power supply rail. the amplitude of the supply ripple is compared to the amplitude of the output signal generated and is expressed as a ratio. 6. mute attenuation - this is a measure of the difference in level between the full scale output signal and the output with mute applied (ie. ena = logic 0). 7. all performance measurements are carried out with 20khz aes17 low pass filter for distortion measurements, and an a-weighted filter for noise measurement. failure to use such a filter will result in higher thd and lower snr and dynamic range readings than are found in the electrical characteristics. the low pass filter removes out-of-band noise; although it is not audible, it may affect dynamic specification values.
production data wm9010 w pd, february 2011, rev 4.0 7 device description introduction the wm9010 is a low power stereo headphone driver designed for mobile handset and portable media player (pmp) applications. it is packaged in a 12-pin csp. the device comprises two analogue input pins, each accepting line signals up to 1vrms. the signal path gain is fixed at 0db. the headphone output drivers deliver up to 28mw into a 32 ? load. the wm9010 incorporates class g technology to achieve high efficiency and low quiescent current. an integrated charge pump circuit is used to generate the split (positive and negative) power rails from a single vdd supply. the ground-referenced headphone driver design reduces the device power consumption and also eliminates external dc-blocking capacitors on the audio output path. the wm9010 is enabled when a logic high level is detected on ena. note that the ena pin can support digital logic levels up to 2.7v. wolfson?s silent switch? technology is incorporated in order to minimise ?pop? noise whenever the wm9010 is enabled or disabled. a power on reset circuit ensures correct start-up and shut-down when vdd is switched on or off. the wm9010 is held in reset when the ena pin is held low, offering a low-power standby state. short circuit and thermal protection is also provided. headphone driver the wm9010 has two analogue input pins, inl and inr. the input signals are referenced to the inref pin, which is provided as a quiet ground reference connection. the maximum analogue input signal level varies with vdd, but is typically 0dbv (1vrms) when vdd = 1.8v. this is suitable for single-ended connection to line level input signals. the headphone output drivers are capable of driving up to 28mw into a 32 ? load such as a stereo headset or headphones. the outputs are ground-referenced, eliminating any requirement for ac coupling capacitors. this is achieved by having separate positive and negative supply rails powered by an on-chip charge pump. a pop-suppression circuit ensures that dc offsets are minimised, suppressing ?pop? noise and reducing power consumption. to obtain optimal dc offsets, the device should be powered on with no signal on the input pins. it is recommended to connect a zobel network to the headphone output pins hpoutl and hpoutr for best audio performance in all applications. the components of the zobel network have the effect of dampening high frequency oscillations or instabilities that can arise outside the audio band under certain conditions. possible sources of these instabilities include the inductive load of a headphone coil or an active load in the form of an external line amplifier. the capacitance of lengthy cables or pcb tracks can also lead to amplifier instability. the zobel network should comprise of a 20 resistor and 100nf capacitor in series with each other, as illustrated in figure 1. figure 1 external connections for hpoutl and hpoutr
wm9010 production data w pd, february 2011, rev 4.0 8 charge pump the wm9010 incorporates a charge pump circuit, which generates the supply rails for the headphone output drivers. the charge pump is powered from vdd, and generates split rails cpvoutp and cpvoutn. the circuit is adaptive according to the audio signal conditions, supporting the class g operation and ensuring optimum circuit configuration at all times. the switching clock for the charge pump is generated internally. the external connections for the charge pump are illustrated in figure 2. a fly-back capacitor is connected between the cpca and cpcb pins. de-coupling capacitors are required on cpvoutp and cpvoutn. an input decoupling capacitor may also be required at vdd, depending upon the system configuration. figure 2 external connections for charge pump
production data wm9010 w pd, february 2011, rev 4.0 9 applications information recommended external components figure 3 provides a summary of recommended external components for wm9010. note that the actual requirements may differ according to the specific target application. figure 3 wm9010 recommended external components diagram pcb layout considerations poor pcb layout will degrade the performance and be a contributory factor in emi, ground bounce and resistive voltage losses. all external components should be placed as close to the wm9010 device as possible, with current loop areas kept as small as possible.
wm9010 production data w pd, february 2011, rev 4.0 10 package dimensions dm078.a b: 12 ball w-csp package 1.840 x 1.340 x 0.7mm body, 0.50 mm ball pitch notes: 1. primary datum -z- and seating plane are defined by the spherical crowns of the solder balls. 2. a1 corner is identified by ink/laser mark on top package. 3. ?e? represents the basic solder ball grid pitch. 4. this drawing is subject to change without notice. 5. follows jedec design guide mo-211-c. a1 0.187 d d1 e e1 e 1.500 bsc 1.340 0.160 1.000 bsc 0.500 bsc 1.840 dimensions (mm) symbols min nom max note a 0.7 a2 0.488 0.500 0.512 3 f 1 0.725 0.675 0.2 0.213 0.160 h 0.267 a1 corner top view e d 2 detail 2 detail 2 a a2 a1 z bbb z 1 solder ball e1 a detail 1 c b e e bottom view 1 43 2 f 1 f 2 h 3 d1 0.05 4 x 4 4 f 2 detail 1 1.820 1.320 1.360 1.860
production data wm9010 w pd, february 2011, rev 4.0 11 important notice wolfson microelectronics plc (?wolfson?) products and services are sold subject to wolfson?s terms and conditions of sale, delivery and payment supplied at the time of order acknowledgement. wolfson warrants performance of its products to the specifications in effect at the date of shipment. wolfson reserves the right to make changes to its products and specifications or to discontinue any product or service without notice. customers should therefore obtain the latest version of relevant information from wolfson to verify that the information is current. testing and other quality control techniques are utilized to the extent wolfson deems necessary to support its warranty. specific testing of all parameters of each device is not necessarily performed unless required by law or regulation. in order to minimize risks associated with customer applications, the customer must use adequate design and operating safeguards to minimise inherent or procedural hazards. wolfson is not liable for applications assistance or customer product design. the customer is solely responsible for its selection and use of wolfson products. wolfson is not liable for such selection or use nor for use of any circuitry other than circuitry entirely embodied in a wolfson product. wolfson?s products are not intended for use in life support systems, appliances, nuclear systems or systems where malfunction can reasonably be expected to result in personal injury, death or severe property or environmental damage. any use of products by the customer for such purposes is at the customer?s own risk. wolfson does not grant any licence (express or implied) under any patent right, copyright, mask work right or other intellectual property right of wolfson covering or relating to any combination, machine, or process in which its products or services might be or are used. any provision or publication of any third party?s products or services does not constitute wolfson?s approval, licence, warranty or endorsement thereof. any third party trade marks contained in this document belong to the respective third party owner. reproduction of information from wolfson datasheets is permissible only if reproduction is without alteration and is accompanied by all associated copyright, proprietary and other notices (including this notice) and conditions. wolfson is not liable for any unauthorised [ alteration of such information or for any reliance placed thereon. any representations made, warranties given, and/or liabilities accepted by any person which differ from those contained in this datasheet or in wolfson?s standard terms and conditions of sale, delivery and payment are made, given and/or accepted at that person?s own risk. wolfson is not liable for any such representations, warranties or liabilities or for any reliance placed thereon by any person. address: wolfson microelectronics plc 26 westfield road edinburgh eh11 2qb united kingdom tel :: +44 (0)131 272 7000 fax :: +44 (0)131 272 7001 email :: sales@wolfsonmicro.com
wm9010 production data w pd, february 2011, rev 4.0 12 revision history date rev originator changes 18/02/11 4.0 ct/jmacd product status updated to production data max and min electrical characteristics figures added. 4.0 jmacd/is bandwidth specifications added to snr and thd+n in electrical characteristics

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