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ly8663 rev. 1.7 dual 2.0w/ch stereo audio amplif ier include headphone function with active-high shutdown mode lyontek inc. reserves the rights to change the specifications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 1 ? features ? 2.5v~5.5v power supply. ? thermal shutdown protection. ? low current shutdown mode ? low noise during turn-on and turn-off transitions. ? support ?click and pop? suppression circuitry ? stereo headphone amplifier mode. ? shutdown pin high active. ? lead free and green package available. (rohs compliant) ? space saving package -- tssop 14 pin packaging . application ? portable and desktop computers ? multimedia monitors ? portable audio system general description the ly8663 is a dual stereo audio power amplifier. it is capable of driving 4 speaker load at a continuous average output of 2.0w / 10% distortion (thd+n) from at 5.5v power supply. the ly8663 primarily designed for high quality output power from application in other portable communication device and portable and desktop computers device. the ly8663 audio amplifier features low power consumption in shutdown mode. it is achieved by driving the shutdown pin with logic high. and the ly8663 has an internal thermal shutdown protection feature. to simplify audio system design and the ly8663 audio amplifier supports dual bridge-tied load (btl) speaker amplifier and stereo single-end (se) headphone. it is ideally suited for other low voltage applications or portable electronic devices where minimal power consumption is a primary requirement. pin configuration ly8663 tssop14 pin conf iguration (top view)
ly8663 rev. 1.7 dual 2.0w/ch stereo audio amplif ier include headphone function with active-high shutdown mode lyontek inc. reserves the rights to change the specifications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 2 ? pin description pin no. symbol tssop description shutdown 1 shutdown control.(when high level is active the pin) gnd 2/13 ground +outa 3 positive btl output of a channel. v dd 4/11 power supply -outa 5 negative btl output of a channel. -ina 6 negative input of a channel. bypass 8 bypass pin -inb 9 positive input of b channel. -outb 10 negative btl output of b channel. +outb 12 positive btl output of b channel. hp-in 14 mode control, hold low for btl mode, hold high for se mode. (if none headphone function must connect to gnd) nc 7 not connection typical application circuit figure 1. without headphone typical application circuit
ly8663 rev. 1.7 dual 2.0w/ch stereo audio amplif ier include headphone function with active-high shutdown mode lyontek inc. reserves the rights to change the specifications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 3 ? figure 2. with headphone typical application circuit absolute maximun ratings* parameter symbol rating unit supply voltage v dd 6.0 v operating temperature t a -40 to 85 (i grade) input voltage v i -0.3v to v dd +0.3v v storage temperature t stg -65 to +150 power dissipation p d internally limited w esd susceptibility v esd 2000 v junction temperature t jmax 150 vapor phase (60 sec.) 215 soldering information infrared (15 sec.) 220
ly8663 rev. 1.7 dual 2.0w/ch stereo audio amplif ier include headphone function with active-high shutdown mode lyontek inc. reserves the rights to change the specifications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 4 ? dc electrical characteristics (v dd =5.0v, t a =25 ) parameter symbol test condition min. typ. max. unit power supply current i dd v i n = 0v,8 load (btl) - 12.0 21.5 ma shutdown current i sd v shutdow n = 0v hp sense= gnd - 0.1 2.0 a shutdown, headphone sense high input voltage v sdih 1.4 - - v shutdown, headphone sense low input voltage v sdil - - 0.4 v wake-up time t wu bypass cap.=1.0uf - 172 - ms output offset voltage v os - 7.0 50.0 mv thd+n = 1%, f = 1 khz, r l =8 ? - 1.0 - thd+n = 10%, f = 1 khz r l =8 ? - 1.3 - thd+n = 10%, f = 1 khz r l =8 ? (at 5.5v) - 1.5 - thd+n = 1%, f = 1 khz r l =4 ? - 1.5 - thd+n = 10%, f = 1 khz r l =4 ? - 1.8 - thd+n = 10%, f = 1 khz r l =4 ? (at 5.5v) - 2.1 - w thd+n = 0.1%, f = 1 khz, r l =32 ? (se mode) - 90 - output power po thd+n = 0.1%, f = 1 khz, r l =16 ? (se mode) - 165 - mw total harmonic distortion+ noise thd+n po = 0.66 w; f = 1khz, v dd =5.0v; r l =8 ? - 0.11 - % power supply rejection ratio psrr vripple = 200mv sine p-p input terminated with 10 to gnd - 62 (f = 217hz) 66 (f = 1khz) - db f = 20 hz to 20 khz, a-weighting - 37.5 - output voltage noise vn f = 20 hz to 20 khz, a-weighting (se mode) - 15 - uv thermal shutdown temperature t sd 150 170 190 shut down time t sdt 8 ? load - 1.0 - ms
ly8663 rev. 1.7 dual 2.0w/ch stereo audio amplif ier include headphone function with active-high shutdown mode lyontek inc. reserves the rights to change the specifications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 5 ? dc electrical characteristics (v dd =3.6v, t a =25 ) parameter symbol test condition min. typ. max. unit power supply current i dd v i n = 0v, i o = 0a, 8 load (btl) - 10.0 16.5 ma shutdown current i sd v shutdow n = 0v hp sense= gnd - 0.1 2.0 a shutdown, headphone sense high input voltage v sdih 1.4 - - v shutdown, headphone sense low input voltage v sdil - - 0.4 v wake-up time t wu bypass cap.=1.0uf - 82 - ms output offset voltage v os - 7.0 50 mv thd+n = 1%, f = 1 khz, r l =8 ? - 0.5 - thd+n = 10%, f = 1 khz r l =8 ? - 0.65 - thd+n = 1%, f = 1 khz r l =4 ? - 0.65 - thd+n = 10%, f = 1 khz r l =4 ? - 0.8 - w thd+n = 0.1%, f = 1 khz, r l =32 ? (se mode) - 45 - output power po thd+n = 0.1%, f = 1 khz, r l =16 ? (se mode) - 83 - mw total harmonic distortion+ noise thd+n po = 0.35 w; f = 1khz, v dd =3.6v; r l =8 ? - 0.12 - % power supply rejection ratio psrr vripple = 200mv sine p-p input terminated with 10 to gnd - 56 (f = 217hz) 62 (f = 1khz) - db f = 20 hz to 20 khz, a-weighting - 37.5 - output voltage noise vn f = 20 hz to 20 khz, a-weighting (se mode) - 15 - uv thermal shutdown temperature t sd 150 170 190 shut down time t sdt 8 ? load - 1.0 - ms
ly8663 rev. 1.7 dual 2.0w/ch stereo audio amplif ier include headphone function with active-high shutdown mode lyontek inc. reserves the rights to change the specifications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 6 ? ordering information ly 8 663 vv v : package type al : 14-pin tssop with thermal pad il : 14-pin tssop without thermal pad product name a : product line ly : lyontek product number prefix
ly8663 rev. 1.7 dual 2.0w/ch stereo audio amplif ier include headphone function with active-high shutdown mode lyontek inc. reserves the rights to change the specifications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 7 ? typical performanc e characteristics figure 3 total harmonic distortion + noise vs output power figure 4 total harmonic distortion + noise vs output power
ly8663 rev. 1.7 dual 2.0w/ch stereo audio amplif ier include headphone function with active-high shutdown mode lyontek inc. reserves the rights to change the specifications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 8 ? application information power supply bypassing as with any power amplifier, proper supply bypassing is critical for low noise performance and high power supply rejection. applications that em ploy a 5v regulator typically use a 10 f in parallel with a 0.1 f filter capacitor to stabilize the regulator?s output, reduce noise on the supply line, and improve the supply?s transient response. however, their presenc e does not eliminate the need for a local 1.0 f tantalum bypass capacitance connected between the ly8663?s supply pins and ground. do not substitute a ceramic capacitor for the tantalum. doing so may cause oscillation. keep t he length of leads and traces that connect capacitors between the ly8663?s power supply pin and ground as short as possible. micro-power shutdown the voltage applied to the shutdown pin controls t he ly8663?s shutdown function. activate micro-power shutdown by applying vdd to the shutdown pin. when active, the ly8663?s micro-power shutdown feature turns off the amplifier?s bias circui try, reducing the supply current. the low 0.1 a typical shutdown current is achieved by applying a voltage that is as near as vdd as possible to the shutdown pin. a voltage that is less than vdd may increase the shutdown current. table 1 shows the logic signal levels that activa te and deactivate micro-power shutdown and headphone amplifier operation. there are a few ways to control the micro-power shut down. these include using a single-pole, single-throw switch, a microprocessor or a microcontroller. when usi ng a switch, connect an external 20k resistor between the shutdown pin and vdd. connect the switch be tween the shutdown pin and gnd. select normal amplifier operation by closing the switch. opening t he switch sets the shutdown pin to vdd through the 20k resistor, which activates the micro-power shut down. the switch and resistor guarantee that the shutdown pin will not float. this pr events unwanted state changes. in a sy stem with a microprocessor or a microcontroller, use a digital output to apply the c ontrol voltage to the shutdown pin. driving the shutdown pin with active circuitry eliminates the pull up resistor. table 1. logic level truth table shutdown pin hp-in pin operational output mode logic low low (hp not plugged in) btl logic low high (hp plugged in) single-ended logic high high or low don?t care micro-power shutdown hp-in functions applying a voltage between 4v and vdd level to the ly 8663?s hp-in headphone control pin turns off amp. a (+out) and amp. b (+out) muting a bridged-connected l oad. quiescent current consumption is reduced when the ic is in this single-ended mode. figure 3 shows the implementati on of the ly8663?s headphone control function. with no headphones connected to the headphone jack, the r3,r8 voltage divider sets the voltage applied to the hp-in pin (pin 20) at approximately 50mv. this 50mv enables amp a (+ou t) and amp b (+out) placing the ly8663 in bridged mode operation. while the ly8663 operates in bridged mode, the dc potent ial across the load is essentially 0v. the hp-in threshold is set at 4v. therefore, even in an ideal si tuation, the output swing cannot cause a false single -ended trigger. connecting headphones to the headphone jack disconnects the headphone jack contact pin from ? outa and allows r8 to pull the hp-in pin up to vdd. this enables the headphone function, turns off amp a (+out) and amp b (+out) and mutes the bridged speaker. the amplifier then drives the headphones, whose impedance is in parallel with resistors r3 and r4. these resistors have negligible effect on the ly8663?s output drive capability since the typical impedance of headphones is 32 ? . figure 3 also shows the suggested headphone jack electrical connections. the jack is designed to mate with a three wire plug. the plug?s tip and ring should each carry one of the two stereo output signals, whereas the
ly8663 rev. 1.7 dual 2.0w/ch stereo audio amplif ier include headphone function with active-high shutdown mode lyontek inc. reserves the rights to change the specifications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 9 ? sleeve should carry the ground return. the headphone jack with one control pin contact is sufficient to drive the hp-in pin when connecting headphones. as outlined above driving the speaker (btl) and he adphone (se) loads simultaneously using ly8663 is simple and easy. however this configuration will only wo rk if the hp logic pin is used to control the btl/se operation and hp-in pin is co nnected to gnd(figure 4). figure 3. with headphone circuit figure 4. without headphone circuit
ly8663 rev. 1.7 dual 2.0w/ch stereo audio amplif ier include headphone function with active-high shutdown mode lyontek inc. reserves the rights to change the specifications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 10 ? bypass capacitor value selection besides minimizing the input capacitor size, careful cons ideration should be paid to value of c6, the capacitor connected to the bypass pin. since c6 determines how fast the ly8663 settles to quiescent operation, its value is critical when minimizing turn-on pops. the sl ower the ly8663?s outputs ramp to their quiescent dc voltage (nominally 1/2 vdd), the smaller the turn-on pop. choosing c6 equal to 1.0 f along with a small value of c1,c2 (in the range of 0.1 f to 0.39 f), produces a click-less and p op-less shutdown function. as discussed above, choosing c1,c2 no larger than necessary for the desir ed bandwith helps minimize clicks and pops. optimizing click and pop reduction performance the ly8663 contains circuitry that minimizes turn-on and shutdown transients or ?clicks and pop?. for this discussion, turn-on refers to either applying the power supply voltage or when the shutdown mode is deactivated. when the part is tur ned on, an internal current source change s the voltage of the bypass pin in a controlled, linear manner. ideally, the input and ou tputs track the voltage appl ied to the bypass pin. the gain of the internal amplifiers remains unity until t he voltage on the bypass pin reaches 1/2 vdd. as soon as the voltage on the bypass pin is stable, the dev ice becomes fully operatio nal. although the bypass pin current cannot be modified, changing the size of c6 alters the device?s turn-on time and the magnitude of ?clicks and pops?. increasing the value of c6 reduces the magnitude of turn-on pops. however, this presents a tradeoff: as the size of c6 increases, the turn-on time increases. there is a lin ear relationship between the size of c6 and the turn-on time. here are some typical turn-on times for various values of c6: in order eliminate ?clicks and pops?, all capacitors mu st be discharged before turn-on. rapidly switching vdd on and off may not allow the capacitors to fully discharge, which may cause ?clicks and pops?. in a single -ended configuration, the output is coupled to the load by c3,c4. this capacitor usually has a high value. c3,c4 discharges through internal 20k ? resistors. depending on the size of c3,c4, the discharge time constant can be relatively large. to reduce transients in single-ended mode, an external 1k ? - 5k ? resistor can be placed in parallel with the internal 20k ? resistor. the tradeoff for using this resistor is increased quiescent current. table 2. c 6 and t on truth table c 6 t on (typ.) at 5.0v 1.0uf 172 ms 0.47uf 76 ms 0.33uf 60 ms 0.22uf 50 ms 0.1uf 36 ms
ly8663 rev. 1.7 dual 2.0w/ch stereo audio amplif ier include headphone function with active-high shutdown mode lyontek inc. reserves the rights to change the specifications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 11 ? package outline dimension 14-pin tssop package outline dimension

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