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lm4911 , lm4911q www.ti.com snas152m ? may 2004 ? revised june 2011 lm4911/lm4911q stereo 40mw low noise headphone amplifier with selectable capacitive coupled or ocl output check for samples: lm4911 , lm4911q 1 features key specifications 2 ? ocl or capacitively coupled outputs (patent ? psrr at 217hz and 1khz 65 db (typ) pending) ? output power at 1khz with v dd = 2.4v, ? external gain-setting capability 1% thd+n into a 16 ? load 25 mw (typ) ? available in space-saving vssop and wson ? output power at 1khz with v dd = 3v, packages 1% thd+n into a 16 ? load 40 mw (typ) ? ultra low current shutdown mode ? shutdown current 2.0 a (max) ? mute mode allows fast turn-on (1ms) with ? output voltage change on release from less than 1mv change on outputs shutdown v dd = 2.4v, r l = 16 ? (c-coupled) 1 mv (max) ? 2v - 5.5v operation ? mute current 100 a (max) ? ultra low noise ? lm4911qmm is an automotive grade product description that is aec-q100 grade 2 qualified. the lm4911/lm4911q is an stereo audio power amplifier capable of delivering 40mw per channel of applications continuous average power into a 16 ? load or 25mw ? portable cd players per channel into a 32 ? load at 1% thd+n from a 3v power supply. ? pdas ? portable electronics devices boomer audio power amplifiers were designed specifically to provide high quality output power with a ? automotive minimal amount of external components. since the lm4911/lm4911q does not require bootstrap capacitors or snubber networks, it is optimally suited for low-power portable systems. in addition, the lm4911/lm4911q may be configured for either single-ended capacitively coupled outputs or for ocl outputs (patent pending). block diagram figure 1. block diagram 1 please be aware that an important notice concerning availability, standard warranty, and use in critical applications of texas instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 all trademarks are the property of their respective owners. production data information is current as of publication date. copyright ? 2004 ? 2011, texas instruments incorporated products conform to specifications per the terms of the texas instruments standard warranty. production processing does not necessarily include testing of all parameters.
lm4911 , lm4911q snas152m ? may 2004 ? revised june 2011 www.ti.com description (continued) the lm4911/lm4911q features a low-power consumption shutdown mode and a power mute mode that allows for faster turn on time with less than 1mv voltage change at outputs on release. additionally, the lm4911/lm4911q features an internal thermal shutdown protection mechanism. the lm4911/lm4911q is unity gain stable and may be configured with external gain-setting resistors. a q-grade version is available for automotive applications. it is aec-q100 grade 2 qualified and packaged in a 10 ? pin vssop package (lm4911qmm). typical application figure 2. typical capacitive coupled output configuration circuit figure 3. typical ocl output configuration circuit 2 submit documentation feedback copyright ? 2004 ? 2011, texas instruments incorporated product folder links: lm4911 lm4911q
lm4911 , lm4911q www.ti.com snas152m ? may 2004 ? revised june 2011 connection diagram figure 4. vssop package (top view) figure 5. wson package (top view) see package number dgs0010a see package number ngy0010a these devices have limited built-in esd protection. the leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the mos gates. absolute maximum ratings (1) (2) supply voltage 6.0v storage temperature ? 65 c to +150 c input voltage -0.3v to v dd + 0.3v power dissipation (3) internally limited esd susceptibility (4) 2000v esd susceptibility (5) 200v junction temperature 150 c jc (vssop) 56 c/w ja (vssop) 190 c/w thermal resistance ja (wson) (6) 63 c/w ja (wson) (6) 12 c/w (1) absolute maximum ratings indicate limits beyond which damage to the device may occur. operating ratings indicate conditions for which the device is functional but do not ensure specific performance limits. electrical characteristics state dc and ac electrical specifications under particular test conditions which ensures specific performance limits. this assumes that the device is within the operating ratings . specifications are not ensured for parameters where no limit is given; however, the typical value is a good indication of device performance. (2) if military/aerospace specified devices are required, please contact the texas instruments sales office/ distributors for availability and specifications. (3) the maximum power dissipation must be derated at elevated temperatures and is dictated by t jmax , ja , and the ambient temperature, t a . the maximum allowable power dissipation is p dmax = (t jmax - t a ) / ja or the number given in absolute maximum ratings , whichever is lower. for the lm4911/lm4911q, see power derating currents for more information. (4) human body model, 100pf discharged through a 1.5k ? resistor. (5) machine model, 220pf-240pf discharged through all pins. (6) the ngy0010a package has its exposed-dap soldered to an exposed 1.2in 2 area of 1oz. printed circuit board copper. operating ratings t min t a t max (lm4911mm) ? 40 c t a 85 c temperature range t min t a t max (lm4911qmm) ? 40 c t a 105 c supply voltage (v dd ) 2v v cc 5.5v copyright ? 2004 ? 2011, texas instruments incorporated submit documentation feedback 3 product folder links: lm4911 lm4911q 8 9 4 3 1 2 7 6 5 10 gnd vob voa vdd voc sd bypass in b in a mute
lm4911 , lm4911q snas152m ? may 2004 ? revised june 2011 www.ti.com electrical characteristics v dd = 5.0v (1) (2) (3) the following specifications apply for v dd = 5v, r l = 16 ? , and c b = 4.7 f unless otherwise specified. limits apply to t a = 25 c. lm4911 lm4911q units symbol parameter conditions (limits) typ (4) limit (5) typ (4) limit (5) v in = 0v, i o = 0a i dd quiescent current t a = +25 c 2 5 2 5 ma (max) t a = ? 40 c to +105 c 6 ma (max) i sd shutdown current v shutdown = gnd 0.1 2 0.1 2 a (max) v mute = v dd , c-coupled i m mute current t a = +25 c 50 100 50 100 a (max) t a = ? 40 c to +105 c 150 a (max) shutdown voltage input v sdih t a = ? 40 c to +105 c 1.8 1.8 v high shutdown voltage input v sdil t a = ? 40 c to +105 c 0.4 0.4 v low v mih mute voltage input high t a = ? 40 c to +105 c 1.8 1.8 v v mil mute voltage input low t a = ? 40 c to +105 c 0.4 0.4 v thd 1%, f 1khz ocl, rload = 16 ? 80 mw (max) lm4911/lm4911qld ocl, r load 145 mw (max) = 16 ? (6) ocl, r load = 32 ? 80 mw (max) p o output power c-cupl, r load = 16 ? t a = +25 c 145 134 145 mw (min) t a = ? 40 c to +105 c 130 mw (min) c-cupl, r load = 32 ? 85 mw (max) total harmonic distortion + % (max) thd+n p o = 15.3mw, f = 1khz 0.1 0.5 0.1 0.5 noise (7) power supply rejection v ripple = 200mv sine p-p psrr 65 65 db ratio f = 1khz (8) v on output noise voltage bw = 20hz to 20khz, a-weighted 10 10 v (1) all voltages are measured with respect to the gnd pin unless otherwise specified. (2) absolute maximum ratings indicate limits beyond which damage to the device may occur. operating ratings indicate conditions for which the device is functional but do not ensure specific performance limits. electrical characteristics state dc and ac electrical specifications under particular test conditions which ensures specific performance limits. this assumes that the device is within the operating ratings . specifications are not ensured for parameters where no limit is given; however, the typical value is a good indication of device performance. (3) datasheet min/max specification limits are specified by design, test, or statistical analysis. (4) typicals are measured at 25 c and represent the parametric norm. (5) limits are specified to ti ' s aoql (average outgoing quality level). (6) the ngy0010a package has its exposed-dap soldered to an exposed 1.2in 2 area of 1oz. printed circuit board copper. (7) the limit is specified over the temperature range of ? 40 c to +85 c. (8) 10 ? terminated input. 4 submit documentation feedback copyright ? 2004 ? 2011, texas instruments incorporated product folder links: lm4911 lm4911q
lm4911 , lm4911q www.ti.com snas152m ? may 2004 ? revised june 2011 electrical characteristics v dd = 3.3v (1) (2) (3) the following specifications apply for v dd = 3.3v, r l = 16 ? , and c b = 4.7 f unless otherwise specified. limits apply to t a = 25 c. lm4911 lm4911q units symbol parameter conditions (limits) typ (4) limit (5) typ (4) limit (5) v in = 0v, i o = 0a i dd quiescent current t a = +25 c 1.5 3 1.5 3 ma (max) t a = ? 40 c to +105 c 4 ma (max) v shutdown = gnd i sd shutdown current t a = +25 c 0.1 2 0.1 2 a (max) t a = ? 40 c to +105 c 4 a (max) v mute = v dd , c-coupled i m mute current t a = +25 c 50 100 50 100 a (max) t a = ? 40 c to +105 c 125 a (max) shutdown voltage input v sdih t a = ? 40 c to +105 c 1.8 1.8 v high shutdown voltage input v sdil t a = ? 40 c to +105 c 0.4 0.4 v low v mih mute voltage input high t a = ? 40 c to +105 c 1.8 1.8 v v mil mute voltage input low t a = ? 40 c to +105 c 0.4 0.4 v thd 1%, `c-cupl, r l = 16 ? p o output power t a = +25 c 60 55 60 55 mw (min) t a = ? 40 c to +105 c 50 mw (min) total harmonic distortion + thd+n p o = 15.3mw, f = 1khz 0.1 0.5 0.1 0.5 % (max) (6) noise power supply rejection v ripple = 200mv sine p-p psrr 65 65 db ratio f = 1khz (7) v on output noise voltage bw = 20hz to 20khz, a-weighted 10 10 v (1) all voltages are measured with respect to the gnd pin unless otherwise specified. (2) absolute maximum ratings indicate limits beyond which damage to the device may occur. operating ratings indicate conditions for which the device is functional but do not ensure specific performance limits. electrical characteristics state dc and ac electrical specifications under particular test conditions which ensures specific performance limits. this assumes that the device is within the operating ratings . specifications are not ensured for parameters where no limit is given; however, the typical value is a good indication of device performance. (3) datasheet min/max specification limits are specified by design, test, or statistical analysis. (4) typicals are measured at 25 c and represent the parametric norm. (5) limits are specified to ti ' s aoql (average outgoing quality level). (6) the limit is specified over the temperature range of ? 40 c to +85 c. (7) 10 ? terminated input. copyright ? 2004 ? 2011, texas instruments incorporated submit documentation feedback 5 product folder links: lm4911 lm4911q
lm4911 , lm4911q snas152m ? may 2004 ? revised june 2011 www.ti.com electrical characteristics v dd = 3.0v (1) (2) (3) the following specifications apply for v dd = 3.0v, r l = 16 ? , and c b = 4.7 f unless otherwise specified. limits apply to t a = 25 c. lm4911 lm4911q units symbol parameter conditions (limits) typ (4) limit (5) typ (4) limit (5) v in = 0v, i o = 0a ma t a = +25 c 1.5 3 1.5 3 i dd quiescent current (max) ma t a = ? 40 c to +105 c 4 (max) i sd shutdown current v shutdown = gnd 0.1 2 0.1 2 a (max) v mute = v dd , c-coupled i m mute current t a = +25 c 50 100 50 100 a (max) t a = ? 40 c to +105 c 120 a (max) shutdown voltage input v sdih t a = ? 40 c to +105 c 1.8 1.8 v high v sdil shutdown voltage input low t a = ? 40 c to +105 c 0.4 0.4 v v mih mute voltage input high t a = ? 40 c to +105 c 1.8 1.8 v v mil mute voltage input low t a = ? 40 c to +105 c 0.4 0.4 v thd 1%; c-cupl, r l = 16 ? mw t a = +25 c 40 40 35 (min) p o output power mw t a = ? 40 c to +105 c 30 (min) mw thd 1%, f = 1khz, r l = 32 ? 25 (min) total harmonic distortion + % (max) thd+n p o = 15.3mw, f = 1khz 0.1 0.5 0.1 0.5 noise (6) power supply rejection v ripple = 200mv sine p-p psrr 65 65 db ratio f = 1khz (7) v on output noise voltage bw = 20 hz to 20khz, a-weighted 10 10 v (1) all voltages are measured with respect to the gnd pin unless otherwise specified. (2) absolute maximum ratings indicate limits beyond which damage to the device may occur. operating ratings indicate conditions for which the device is functional but do not ensure specific performance limits. electrical characteristics state dc and ac electrical specifications under particular test conditions which ensures specific performance limits. this assumes that the device is within the operating ratings . specifications are not ensured for parameters where no limit is given; however, the typical value is a good indication of device performance. (3) datasheet min/max specification limits are specified by design, test, or statistical analysis. (4) typicals are measured at 25 c and represent the parametric norm. (5) limits are specified to ti ' s aoql (average outgoing quality level). (6) the limit is specified over the temperature range of ? 40 c to +85 c. (7) 10 ? terminated input. 6 submit documentation feedback copyright ? 2004 ? 2011, texas instruments incorporated product folder links: lm4911 lm4911q
lm4911 , lm4911q www.ti.com snas152m ? may 2004 ? revised june 2011 electrical characteristics v dd = 2.4v (1) (2) (3) the following specifications apply for v dd = 2.4v, r l = 16 ? , and c b = 4.7 f unless otherwise specified. limits apply to t a = 25 c. lm4911 lm4911q units symbol parameter conditions (limits) typ (4) limit (5) typ (4) limit (5) v in = 0v, i o = 0a ma t a = +25 c 1.5 3 1.5 3 i dd quiescent current (max) ma t a = ? 40 c to +105 c 4 (max) i sd shutdown current v shutdown = gnd 0.1 2 0.1 2 a (max) v mute = v dd , c-coupled i m mute current t a = +25 c 40 80 40 80 a (max) t a = ? 40 c to +105 c 100 a (max) shutdown voltage input v sdih t a = ? 40 c to +105 c 1.8 1.8 v high v sdil shutdown voltage input low t a = ? 40 c to +105 c 0.4 0.4 v v mih mute voltage input high t a = ? 40 c to +105 c 1.8 1.8 v v mil mute voltage input low 0.4 0.4 v thd = 1%; c-cupl, r l = 16 ? mw t a = +25 c 25 25 20 (min) p o output power mw t a = ? 40 c to +105 c 15 (min) thd 1%; r l = 32 ? , f = 1khz 12 12 total harmonic distortion + % (max) thd+n p o = 15.3mw, f = 1khz 0.1 0.5 0.1 0.5 noise (6) ocl 0.5 0.5 s t wu wake up time c-coupled, c o = 100 f 2 2 s t um un-mute time c-coupled, c o = 100 f 0.01 0.02 0.01 0.02 s (max) output voltage change on mv v osd c-coupled, c o = 100 f 1 1 release from shutdown (max) power supply rejection v ripple = 200mv sine p-p psrr 65 65 db ratio f = 1khz (7) v on output noise voltage bw = 20 hz to 20khz, a-weighted 10 10 db (1) all voltages are measured with respect to the gnd pin unless otherwise specified. (2) absolute maximum ratings indicate limits beyond which damage to the device may occur. operating ratings indicate conditions for which the device is functional but do not ensure specific performance limits. electrical characteristics state dc and ac electrical specifications under particular test conditions which ensures specific performance limits. this assumes that the device is within the operating ratings . specifications are not ensured for parameters where no limit is given; however, the typical value is a good indication of device performance. (3) datasheet min/max specification limits are specified by design, test, or statistical analysis. (4) typicals are measured at 25 c and represent the parametric norm. (5) limits are specified to ti ' s aoql (average outgoing quality level). (6) the limit is specified over the temperature range of ? 40 c to +85 c. (7) 10 ? terminated input. copyright ? 2004 ? 2011, texas instruments incorporated submit documentation feedback 7 product folder links: lm4911 lm4911q
lm4911 , lm4911q snas152m ? may 2004 ? revised june 2011 www.ti.com external components description ( figure 2 ) components functional description inverting input resistance which sets the closed-loop gain in conjunction with r f . this resistor also forms a high-pass 1. r i filter with c i at f c = 1/(2 r i c i ). input coupling capacitor which blocks the dc voltage at the amplifier's input terminals. also creates a high-pass filter 2. c i with r i at f c = 1/(2 r i c i ). refer to the section proper selection of external components , for an explanation of how to determine the value of c i . 3. r f feedback resistance which sets the closed-loop gain in conjunction with r i . supply bypass capacitor which provides power supply filtering. refer to the power supply section for information 4. c s concerning proper placement and selection of the supply bypass capacitor. bypass pin capacitor which provides half-supply filtering. refer to the section, proper selection of external 5. c b components , for information concerning proper placement and selection of c b output coupling capacitor which blocks the dc voltage at the amplifier's output. forms a high pass filter with r l at f o = 6. c o 1/(2 r l c o ) 8 submit documentation feedback copyright ? 2004 ? 2011, texas instruments incorporated product folder links: lm4911 lm4911q
lm4911 , lm4911q www.ti.com snas152m ? may 2004 ? revised june 2011 typical performance characteristics thd+n thd+n vs vs frequency frequency figure 6. figure 7. thd+n thd+n vs vs frequency frequency figure 8. figure 9. thd+n thd+n vs vs frequency frequency figure 10. figure 11. copyright ? 2004 ? 2011, texas instruments incorporated submit documentation feedback 9 product folder links: lm4911 lm4911q
lm4911 , lm4911q snas152m ? may 2004 ? revised june 2011 www.ti.com typical performance characteristics (continued) thd+n thd+n vs vs frequency frequency figure 12. figure 13. thd+n thd+n vs vs frequency frequency figure 14. figure 15. thd+n thd+n vs vs frequency frequency figure 16. figure 17. 10 submit documentation feedback copyright ? 2004 ? 2011, texas instruments incorporated product folder links: lm4911 lm4911q
lm4911 , lm4911q www.ti.com snas152m ? may 2004 ? revised june 2011 typical performance characteristics (continued) thd+n thd+n vs vs output power output power figure 18. figure 19. thd+n thd+n vs vs output power output power figure 20. figure 21. thd+n thd+n vs vs output power output power figure 22. figure 23. copyright ? 2004 ? 2011, texas instruments incorporated submit documentation feedback 11 product folder links: lm4911 lm4911q
lm4911 , lm4911q snas152m ? may 2004 ? revised june 2011 www.ti.com typical performance characteristics (continued) thd+n thd+n vs vs output power output power figure 24. figure 25. output resistance output power vs vs load resistance supply voltage figure 26. figure 27. output power output power vs vs supply voltage supply voltage figure 28. figure 29. 12 submit documentation feedback copyright ? 2004 ? 2011, texas instruments incorporated product folder links: lm4911 lm4911q
lm4911 , lm4911q www.ti.com snas152m ? may 2004 ? revised june 2011 typical performance characteristics (continued) output power output power vs vs supply voltage load resistance figure 30. figure 31. output power power dissipation vs vs. load resistance output power figure 32. figure 33. power dissipation power dissipation vs. vs output power output power figure 34. figure 35. copyright ? 2004 ? 2011, texas instruments incorporated submit documentation feedback 13 product folder links: lm4911 lm4911q
lm4911 , lm4911q snas152m ? may 2004 ? revised june 2011 www.ti.com typical performance characteristics (continued) channel separation channel separation figure 36. figure 37. channel separation channel separation figure 38. figure 39. channel separation channel separation figure 40. figure 41. 14 submit documentation feedback copyright ? 2004 ? 2011, texas instruments incorporated product folder links: lm4911 lm4911q
lm4911 , lm4911q www.ti.com snas152m ? may 2004 ? revised june 2011 typical performance characteristics (continued) power supply rejection ratio power supply rejection ratio figure 42. figure 43. power supply rejection ratio power supply rejection ratio figure 44. figure 45. power supply rejection ratio power supply rejection ratio figure 46. figure 47. copyright ? 2004 ? 2011, texas instruments incorporated submit documentation feedback 15 product folder links: lm4911 lm4911q
lm4911 , lm4911q snas152m ? may 2004 ? revised june 2011 www.ti.com typical performance characteristics (continued) power supply rejection ratio power supply rejection ratio figure 48. figure 49. frequency response vs frequency response vs input capacitor size input capacitor size figure 50. figure 51. supply voltage vs open loop frequency response supply current figure 52. figure 53. 16 submit documentation feedback copyright ? 2004 ? 2011, texas instruments incorporated product folder links: lm4911 lm4911q
lm4911 , lm4911q www.ti.com snas152m ? may 2004 ? revised june 2011 typical performance characteristics (continued) clipping voltage vs supply voltage noise floor figure 54. figure 55. shutdown hysteresis voltage, vdd=5v shutdown hysteresis voltage, vdd=3v figure 56. figure 57. power derating curve figure 58. copyright ? 2004 ? 2011, texas instruments incorporated submit documentation feedback 17 product folder links: lm4911 lm4911q
lm4911 , lm4911q snas152m ? may 2004 ? revised june 2011 www.ti.com typical performance characteristics lm4911/lm4911q specific characteristics the ngy0010a package has its exposed-dap soldered to an exposed 1.2in 2 area of 1oz. printed circuit board copper. thd+n vs thd+n frequency vs at v dd = 5v, r l = 16 ? output power p o = 100mw, ocl at v dd = 5v, r l = 16 ? , ocl figure 59. figure 60. power dissipation vs output power at v dd = 5v, r l = 16 ? thd+n 1%, ocl figure 61. 18 submit documentation feedback copyright ? 2004 ? 2011, texas instruments incorporated product folder links: lm4911 lm4911q 0 100 200 300 output power (mw) 0 200 400 600 power dissipation (mw) 250 150 50 500 300 100 20 50 100 200 500 1k 2k 5k 10k 20k 0.01 0.02 0.05 0.1 0.2 0.5 1 2 5 10 thd + n (%) frequency (hz) 1m 5m 20m 200m output power (w) 0.001 0.02 0.5 10 thd + n (%) 50m 10m 2m 51 0.1 0.05 0.002 2 0.01 0.005 0.2 100m 20khz 1khz 20hz
lm4911 , lm4911q www.ti.com snas152m ? may 2004 ? revised june 2011 application information amplifier configuration explanation as shown in figure 1 , the lm4911/lm4911q has three operational amplifiers internally. two of the amplifier's have externally configurable gain while the other amplifier is internally fixed at the bias point acting as a unity- gain buffer. the closed-loop gain of the two configurable amplifiers is set by selecting the ratio of r f to r i . consequently, the gain for each channel of the ic is: a vd = -(r f / r i ) by driving the loads through outputs v o a and v o b with v o c acting as a buffered bias voltage the lm4911/lm4911q does not require output coupling capacitors. the classical single-ended amplifier configuration where one side of the load is connected to ground requires large, expensive output coupling capacitors. a configuration such as the one used in the lm4911/lm4911q has a major advantage over single supply, single- ended amplifiers. since the outputs v o a, v o b, and v o c are all biased at 1/2 v dd , no net dc voltage exists across each load. this eliminates the need for output coupling capacitors which are required in a single-supply, single- ended amplifier configuration. without output coupling capacitors in a typical single-supply, single-ended amplifier, the bias voltage is placed across the load resulting in both increased internal ic power dissipation and possible loudspeaker damage. output capacitor vs. capacitor coupled the lm4911/lm4911q is an stereo audio power amplifier capable of operating in two distinct output modes: capacitor coupled (c-cupl) or output capacitor-less (ocl). the lm4911/lm4911q may be run in capacitor coupled mode by using a coupling capacitor on each single-ended output (v o a and v o b) and connecting v o c to ground. this output coupling capacitor blocks the half supply voltage to which the output amplifiers are typically biased and couples the audio signal to the headphones or other single-ended (se) load. the signal return to circuit ground is through the headphone jack's sleeve. the lm4911/lm4911q can also eliminate these output coupling capacitors by running in ocl mode. unless shorted to ground, voc is internally configured to apply a ? v dd bias voltage to a stereo headphone jack's sleeve. this voltage matches the bias voltage present on v o a and v o b outputs that drive the headphones. the headphones operate in a manner similar to a bridge-tied load (btl). because the same dc voltage is applied to both headphone speaker terminals this results in no net dc current flow through the speaker. ac current flows through a headphone speaker as an audio signal's output amplitude increases on the speaker's terminal. the headphone jack's sleeve is not connected to circuit ground when used in ocl mode. using the headphone output jack as a line-level output will place the lm4911/lm4911q's ? v dd bias voltage on a plug's sleeve connection. this presents no difficulty when the external equipment uses capacitively coupled inputs. for the very small minority of equipment that is dc coupled, the lm4911/lm4911q monitors the current supplied by the amplifier that drives the headphone jack's sleeve. if this current exceeds 500ma pk , the amplifier is shutdown, protecting the lm4911/lm4911q and the external equipment. mode select detail the lm4911/lm4911q may be set up to operate in one of two modes: ocl and cap-coupled. the default state of the lm4911/lm4911q at power up is cap-coupled. during initial power up or return from shutdown, the lm4911/lm4911q must detect the correct mode of operation (ocl or cap-coupled) by sensing the status of the v o c pin. when the bias voltage of the part ramps up to 60mv (as seen on the bypass pin), an internal comparator detects the status of v o c; and at 80mv, latches that value in place. ramp up of the bias voltage will proceed at a different rate from this point on depending upon operating mode. ocl mode will ramp up about 11 times faster than cap-coupled. shutdown is not a valid command during this time period (t wu ) and should not enabled to ensure a proper power on reset (por) signal. in addition, the slew rate of v dd must be greater than 2.5v/ms to ensure reliable por. recommended power up timing is shown in figure 63 along with proper usage of shutdown and mute. the mode select circuit is suspended during c b discharge time. copyright ? 2004 ? 2011, texas instruments incorporated submit documentation feedback 19 product folder links: lm4911 lm4911q
lm4911 , lm4911q snas152m ? may 2004 ? revised june 2011 www.ti.com the circuit shown in figure 62 presents an applications solution to the problem of using different supply voltages with different turn-on times in a system with the lm4911/lm4911q. this circuit shows the lm4911/lm4911q with a 25-50k ? pull-up resistor connected from the shutdown pin to v dd . the shutdown pin of the lm4911/lm4911q is also being driven by an open drain output of an external microcontroller on a separate supply. this circuit ensures that shutdown is disabled when powering up the lm4911/lm4911q by either allowing shutdown to be high before the lm4911/lm4911q powers on (the microcontroller powers up first) or allows shutdown to ramp up with v dd (the lm4911/lm4911q powers up first). this will ensure the lm4911/lm4911q powers up properly and enters the correct mode of operation (cap-coupled or ocl). figure 62. recommended circuit for different supply turn-on timing figure 63. turn-on, shutdown, and mute timing for cap-coupled mode 20 submit documentation feedback copyright ? 2004 ? 2011, texas instruments incorporated product folder links: lm4911 lm4911q
lm4911 , lm4911q www.ti.com snas152m ? may 2004 ? revised june 2011 power dissipation power dissipation is a major concern when using any power amplifier and must be thoroughly understood to ensure a successful design. when operating in capacitor-coupled mode, equation 1 states the maximum power dissipation point for a single-ended amplifier operating at a given supply voltage and driving a specified output load. p dmax = (v dd ) 2 / (2 2 r l ) (1) since the lm4911/lm4911q has two operational amplifiers in one package, the maximum internal power dissipation point is twice that of the number which results from equation 1 . from equation 1 , assuming a 3v power supply and an 32 ? load, the maximum power dissipation point is 14mw per amplifier. thus the maximum package dissipation point is 28mw. when operating in ocl mode, the maximum power dissipation increases due to the use of the third amplifier as a buffer and is given in equation 2 : p dmax = 4(v dd ) 2 / ( 2 r l ) (2) the maximum power dissipation point obtained from either equation 1 or equation 2 must not be greater than the power dissipation that results from equation 3 : p dmax = (t jmax - t a ) / ja (3) for package dgs0010a, ja = 190 c/w; for package ngy0010a, ja = 63 c/w. t jmax = 150 c for the lm4911/lm4911q. depending on the ambient temperature, t a , of the system surroundings, equation 3 can be used to find the maximum internal power dissipation supported by the ic packaging. if the result of equation 1 or equation 2 is greater than that of equation 3 , then either the supply voltage must be decreased, the load impedance increased or t a reduced. for the typical application of a 3v power supply, with a 32 ? load, the maximum ambient temperature possible without violating the maximum junction temperature is approximately 144 c provided that device operation is around the maximum power dissipation point. thus, for typical applications, power dissipation is not an issue. power dissipation is a function of output power and thus, if typical operation is not around the maximum power dissipation point, the ambient temperature may be increased accordingly. refer to the typical performance characteristics curves for power dissipation information for lower output powers. exposed-dap package pcb mounting considerations the lm4911/lm4911q's exposed-dap (die attach paddle) package (wson) provides a low thermal resistance between the die and the pcb to which the part is mounted and soldered. this allows rapid heat transfer from the die to the surrounding pcb copper traces, ground plane, and surrounding air. the wson package should have its dap soldered to a copper pad on the pcb. the dap's pcb copper pad may be connected to a large plane of continuous unbroken copper. this plane forms a thermal mass, heat sink, and radiation area. further detailed and specific information concerning pcb layout, fabrication, and mounting an wson package is available from ti's package engineering group under application note an-1187 ( snoa401 ). power supply bypassing as with any amplifier, proper supply bypassing is important for low noise performance and high power supply rejection. the capacitor location on the power supply pins should be as close to the device as possible. typical applications employ a 3v regulator with 10mf tantalum or electrolytic capacitor and a ceramic bypass capacitor which aid in supply stability. this does not eliminate the need for bypassing the supply nodes of the lm4911/lm4911q. a bypass capacitor value in the range of 0.1 f to 1 f is recommended for c s . copyright ? 2004 ? 2011, texas instruments incorporated submit documentation feedback 21 product folder links: lm4911 lm4911q
lm4911 , lm4911q snas152m ? may 2004 ? revised june 2011 www.ti.com micro power shutdown the voltage applied to the shutdown pin controls the lm4911/lm4911q's shutdown function. activate micro- power shutdown by applying a logic-low voltage to the shutdown pin. when active, the lm4911/lm4911q's micro-power shutdown feature turns off the amplifier's bias circuitry, reducing the supply current. the trigger point varies depending on supply voltage and is shown in the shutdown hysteresis voltage graphs in the typical performance characteristics section. the low 0.1 a(typ) shutdown current is achieved by applying a voltage that is as near as ground as possible to the shutdown pin. a voltage that is higher than ground may increase the shutdown current. there are a few ways to control the micro-power shutdown. these include using a single-pole, single-throw switch, a microprocessor, or a microcontroller. when using a switch, connect an external 100k ? pull-up resistor between the shutdown pin and v dd . connect the switch between the shutdown pin and ground. select normal amplifier operation by opening the switch. closing the switch connects the shutdown pin to ground, activating micro-power shutdown. the switch and resistor specifies that the shutdown pin will not float. this prevents unwanted state changes. in a system with a microprocessor or microcontroller, use a digital output to apply the control voltage to the shutdown pin. driving the shutdown pin with active circuitry eliminates the pull-up resistor. shutdown enable/disable times are controlled by a combination of c b and v dd . larger values of c b results in longer turn on/off times from shutdown. smaller v dd values also increase turn on/off time for a given value of c b . longer shutdown times also improve the lm4911/lm4911q's resistance to click and pop upon entering or returning from shutdown. for a 2.4v supply and c b = 4.7 f, the lm4911/lm4911q requires about 2 seconds to enter or return from shutdown. this longer shutdown time enables the lm4911/lm4911q to have virtually zero pop and click transients upon entering or release from shutdown. smaller values of c b will decrease turn-on time, but at the cost of increased pop and click and reduced psrr. since shutdown enable/disable times increase dramatically as supply voltage gets below 2.2v, this reduced turn- on time may be desirable if extreme low supply voltage levels are used as this would offset increases in turn-on time caused by the lower supply voltage. this technique is not recommended for ocl mode since shutdown enable/disable times are very fast (0.5s) independent of supply voltage. when in cap-coupled mode, some restrictions on the usage of mute are in effect when entering or returning from shutdown. these restrictions require mute not be toggled immediately following a return or entrance to shutdown for a brief period. these periods are shown as x1 and x2 and are discussed in greater detail in the mute section as well as shown in figure 63 . mute when in c-cupl mode, the lm4911/lm4911q also features a mute function that enables extremely fast turn- on/turn-off with a minimum of output pop and click with a low current consumption ( 100 a). the mute function leaves the outputs at their bias level, thus resulting in higher power consumption than shutdown mode, but also provides much faster turn on/off times. mute mode is enabled by providing a logic high signal on the mute pin in the opposite manner as the shutdown function described above. threshold voltages and activation techniques match those given for the shutdown function as well. mute may not appear to function when the lm4911/lm4911q is used to drive high impedance loads. this is because the lm4911/lm4911q relies on a typical headphone load (16-32 ? ) to reduce input signal feedthrough through the input and feedback resistors. mute attenuation can thus be calculated by the following formula: mute attenuation (db) = 20log(r l / (r i +r f ) parallel load resistance may be necessary to achieve satisfactory mute levels when the application load is known to be high impedance. the mute function is not necessary when the lm4911/lm4911q is operating in ocl mode since the shutdown function operates quickly in ocl mode with less power consumption than mute. mute may be enabled during shutdown transitions, but should not be toggled for a brief period immediately after exiting or entering shutdown. these brief time periods are labeled x1 (time after returning from shutdown) and x2 (time after entering shutdown) and are shown in the timing diagram given in figure 63 . x1 occurs immediately following a return from shutdown (t wu ) and lasts 40ms 25%. x2 occurs after the part is placed in shutdown and the decay of the bias voltage has occurred (2.2*400k*c b for cap-coupled and 2.2*100k*c b for 22 submit documentation feedback copyright ? 2004 ? 2011, texas instruments incorporated product folder links: lm4911 lm4911q
lm4911 , lm4911q www.ti.com snas152m ? may 2004 ? revised june 2011 ocl) and lasts for 100ms 25%. the timing of these transition periods relative to x1 and x2 is also shown in figure 63 . mute should not be toggled during these time periods, but may be made during the shutdown transitions or any other time the part is in normal operation (while in cap-coupled mode - mute is not valid in ocl mode). failure to operate mute correctly may result in much higher click and pop values or failure of the device to mute at all. proper selection of external components proper selection of external components in applications using integrated power amplifiers is critical to optimize device and system performance. while the lm4911/lm4911q is tolerant of external component combinations, consideration to component values must be used to maximize overall system quality. the lm4911/lm4911q is unity-gain stable which gives the designer maximum system flexibility. the lm4911/lm4911q should be used in low gain configurations to minimize thd+n values, and maximize the signal to noise ratio. low gain configurations require large input signals to obtain a given output power. input signals equal to or greater than 1v rms are available from sources such as audio codecs. very large values should not be used for the gain-setting resistors. values for r i and r f should be less than 1m ? . please refer to the section, audio power amplifier design , for a more complete explanation of proper gain selection besides gain, one of the major considerations is the closed-loop bandwidth of the amplifier. to a large extent, the bandwidth is dictated by the choice of external components shown in figure 2 and figure 3 . the input coupling capacitor, c i , forms a first order high pass filter which limits low frequency response. this value should be chosen based on needed frequency response and turn-on time. selection of input capacitor size amplifying the lowest audio frequencies requires a high value input coupling capacitor, c i . a high value capacitor can be expensive and may compromise space efficiency in portable designs. in many cases, however, the headphones used in portable systems have little ability to reproduce signals below 60hz. applications using headphones with this limited frequency response reap little improvement by using a high value input capacitor. in addition to system cost and size, turn on time is affected by the size of the input coupling capacitor c i . a larger input coupling capacitor requires more charge to reach its quiescent dc voltage. this charge comes from the output via the feedback thus, by minimizing the capacitor size based on necessary low frequency response, turn-on time can be minimized. a small value of c i (in the range of 0.1 f to 0.39 f), is recommended. audio power amplifier design a 25mw/32 ? audio amplifier given: power output 25mwrms load impedance 32 ? input level 1vrms input impedance 20k ? a designer must first determine the minimum supply rail to obtain the specified output power. by extrapolating from the output power vs supply voltage graphs in the typical performance characteristics section, the supply rail can be easily found. 3v is a standard voltage in most applications, it is chosen for the supply rail. extra supply voltage creates headroom that allows the lm4911/lm4911q to reproduce peak in excess of 25mw without producing audible distortion. at this time, the designer must make sure that the power supply choice along with the output impedance does not violate the conditions explained in the power dissipation section. once the power dissipation equations have been addressed, the required gain can be determined from equation 1 . (4) copyright ? 2004 ? 2011, texas instruments incorporated submit documentation feedback 23 product folder links: lm4911 lm4911q
lm4911 , lm4911q snas152m ? may 2004 ? revised june 2011 www.ti.com from equation 3 , the minimum a v is 0.89; use a v = 1. since the desired input impedance is 20k ? , and with a a v gain of 1, a ratio of 1:1 results from for r f to r i . the values are chosen with r i = 20k ? and r f = 20k ? . the final design step is to address the bandwidth requirements which must be stated as a pair of -3db frequency points. five times away from a -3db point is 0.17db down from passband response which is better than the required 0.25db specified. f l = 100hz/5 = 20hz f h = 20khz * 5 = 100khz as stated in the external components section, r i in conjunction with c i creates a c i 1 / (2 * 20k ? * 20hz) = 0.397 f; use 0.39 f. the high frequency pole is determined by the product of the desired frequency pole, f h , and the differential gain, a v . with an a v = 1 and f h = 100khz, the resulting gbwp = 100khz which is much smaller than the lm4911/lm4911q gbwp of 10mhz. this figure displays that is a designer has a need to design an amplifier with higher differential gain, the lm4911/lm4911q can still be used without running into bandwidth limitations. figure 62 shows an optional resistor connected between the amplifier output that drives the headphone jack sleeve and ground. this resistor provides a ground path that suppressed power supply hum. this hum may occur in applications such as notebook computers in a shutdown condition and connected to an external powered speaker. the resistor's 100 ? value is a suggested starting point. its final value must be determined based on the tradeoff between the amount of noise suppression that may be needed and minimizing the additional current drawn by the resistor (25ma for a 100 ? resistor and a 5v supply). esd protection as stated in the absolute maximum ratings, the lm4911/lm4911q has a maximum esd susceptibility rating of 2000v. for higher esd voltages, the addition of a pcdn042 dual transil (from california micro devices), as shown in figure 64 , will provide additional protection. figure 64. the pcdn042 provides additional esd protection beyond the 2000v shown in the absolute maximum ratings for the v o c output 24 submit documentation feedback copyright ? 2004 ? 2011, texas instruments incorporated product folder links: lm4911 lm4911q
package option addendum www.ti.com 26-aug-2013 addendum-page 1 packaging information orderable device status (1) package type package drawing pins package qty eco plan (2) lead/ball finish msl peak temp (3) op temp (c) device marking (4/5) samples lm4911mm/nopb active vssop dgs 10 1000 green (rohs & no sb/br) cu sn level-1-260c-unlim -40 to 85 ga3 lm4911qmm/nopb active vssop dgs 10 1000 green (rohs & no sb/br) cu sn level-1-260c-unlim -40 to 105 gc9 lm4911qmmx/nopb active vssop dgs 10 3500 green (rohs & no sb/br) cu sn level-1-260c-unlim -40 to 105 gc9 (1) the marketing status values are defined as follows: active: product device recommended for new designs. lifebuy: ti has announced that the device will be discontinued, and a lifetime-buy period is in effect. nrnd: not recommended for new designs. device is in production to support existing customers, but ti does not recommend using this part in a new design. preview: device has been announced but is not in production. samples may or may not be available. obsolete: ti has discontinued the production of the device. (2) eco plan - the planned eco-friendly classification: pb-free (rohs), pb-free (rohs exempt), or green (rohs & no sb/br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. tbd: the pb-free/green conversion plan has not been defined. pb-free (rohs): ti's terms "lead-free" or "pb-free" mean semiconductor products that are compatible with the current rohs requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. where designed to be soldered at high temperatures, ti pb-free products are suitable for use in specified lead-free processes. pb-free (rohs exempt): this component has a rohs exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. the component is otherwise considered pb-free (rohs compatible) as defined above. green (rohs & no sb/br): ti defines "green" to mean pb-free (rohs compatible), and free of bromine (br) and antimony (sb) based flame retardants (br or sb do not exceed 0.1% by weight in homogeneous material) (3) msl, peak temp. -- the moisture sensitivity level rating according to the jedec industry standard classifications, and peak solder temperature. (4) there may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) multiple device markings will be inside parentheses. only one device marking contained in parentheses and separated by a "~" will appear on a device. if a line is indented then it is a continuation of the previous line and the two combined represent the entire device marking for that device. important information and disclaimer: the information provided on this page represents ti's knowledge and belief as of the date that it is provided. ti bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. efforts are underway to better integrate information from third parties. ti has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. ti and ti suppliers consider certain information to be proprietary, and thus cas numbers and other limited information may not be available for release.
package option addendum www.ti.com 26-aug-2013 addendum-page 2 in no event shall ti's liability arising out of such information exceed the total purchase price of the ti part(s) at issue in this document sold by ti to customer on an annual basis.
tape and reel information *all dimensions are nominal device package type package drawing pins spq reel diameter (mm) reel width w1 (mm) a0 (mm) b0 (mm) k0 (mm) p1 (mm) w (mm) pin1 quadrant lm4911mm/nopb vssop dgs 10 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.0 q1 lm4911qmm/nopb vssop dgs 10 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.0 q1 lm4911qmmx/nopb vssop dgs 10 3500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 q1 package materials information www.ti.com 12-aug-2013 pack materials-page 1
*all dimensions are nominal device package type package drawing pins spq length (mm) width (mm) height (mm) lm4911mm/nopb vssop dgs 10 1000 210.0 185.0 35.0 lm4911qmm/nopb vssop dgs 10 1000 210.0 185.0 35.0 lm4911qmmx/nopb vssop dgs 10 3500 367.0 367.0 35.0 package materials information www.ti.com 12-aug-2013 pack materials-page 2

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