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ics for audio common use publication date: april 2004 sdc00056aeb 1 AN12941A audio power ic for notebook pc overview the an 12941 a is an amplifier ic for stereo speakers which can output 1 w by 8 ? or 2 w by 4 ? . the agc circuit is built-in to prevent the resonance or the vibration by the speaker's energy and the clipping distortion what is called "broken up sound." of the speakers. also, to reduce power consumption, an 12941 a has a built-in function which automatically detects the input signal and can automatically enter power save mode when there is no signal. features ? speaker ampli?er is 1 w 2-channel: 8 ? , v cc = 5 v or 2 w 2-channel: 4 ? , v cc = 5 v ? built-in agc circuit prevention of the resonance or the vibration by the speaker's energy and the clipping distortion of the speaker by agc at excessive input signal (with agc on/off switch). ? built-in automatic power saving function it detects input signals and switches on/off (with the on/off switch for the automatic power saving). ? operating supply voltage: v cc 3 . 0 v to 5 . 5 v/ v cc _sp 3.0 v to 5.5 v applications ? notebook pc, lcd monitor with speaker block diagram 4 ? to 8 ? agc ? ? ? speaker amplifier agc l r automatic power save standby sw main signal mute sw signal automatic detection s w sp power save sw agc sw agc on level sw audio signal detection sensitivity sw input1 input2 input3 input4 mix circuit automatic detection 14.00 0.10 0.20 0.05 (0.25) (1.00) 0 to 8 0.50 0.10 0.15 0.05 seating plane seating plane (6.90) (5.45) 56 29 28 1 (2.25) (3.70) 6.10 0.10 0.10 0.10 8.10 0.20 1.20 max. (1.00) 0.10 m 0.50 0.10 area of no resin flash unit: mm hsop056-p-0300 a (lead-free package)
an12941 a 2 sdc00056aeb application circuit example 28 29 10 f v cc _sp v cc _sp v cc _sp + 14 db 10 f v cc _sp + 14 db 26 27 power save ?16 dbv ?16 dbv +4 dbv r-channel sp out 4 ? to 16 ? ?2 dbv ?2 dbv 31 30 33 32 + 4 dbv l-channel sp out 4 ? to 16 ? ? 2 dbv ? 2 dbv 35 34 sp save on/of f save ctl sp gnd + 14 db 38 37 36 control gnd 10 k ? 39 0.47 f mute signal det. mute 10 k ? 22 23 24 25 47 k ? sp gnd + 14 db 19 20 21 0.047 f 4.7 f v ref (s p ) agc on/of f gnd 16 17 41 40 0.47 f det. 0 db 0 db ?16 dbv ?16 dbv 42 0.47 f 1 f 100 k ? gnd + 9 db 46 45 44 43 0.47 f hp amplifier l-channel hp out l-channel + 3 db ? 16 dbv ? 16 dbv 10 11 12 15 gnd + 9 db + 3 db 0 db ?16 dbv ?16 dbv 7 8 9 50 49 48 47 v ref signal on/of f 0 db 0 db 0 db 2.4 v ? 22 dbv ? 28 dbv v ref 10 k ? 20 k ? 0.47 f hp amplifier r-channel hp out r-channel ?22 dbv ?28 dbv ?22 dbv ?28 dbv v ref 20 k ? 0.47 f 0.47 f 1 f r-channel in signal on/of f stb ?16 dbv ?22 dbv ?16 dbv ?22 dbv 1 2 3 4 5 10 f reg v cc ? 22 dbv ? 28 dbv standby ? 6 db ? 22 dbv ? 28 dbv 56 55 0.47 f beep ? 6 db ? 6 db ? 22 dbv ? 28 dbv ? 22 dbv ? 28 dbv 54 53 0.47 f 0.47 f 4.7 f from beep ? 6 db ? 16 dbv ? 22 dbv ? 16 dbv ? 22 dbv v ref ? 22 dbv ? 28 dbv l-channel in ? 16 dbv ? 22 dbv 0.47 f 52 51 ? 6 db 13 14 + 3 db + 3 db 0.47 f agc agc 18 6 agc on lebel change supply voltage 5 v supply voltage 3.3 v automatic detection output audio automatic detection on/of f control audio control volume from pccard sp gain high/low sw from modem audio control volume 8
AN12941A sdc00056aeb 3 pin description pin no. description pin no. description 1 v cc 29 v cc _sp l-channel 2 sp gain high/low sw 30 sp ampli?er l-channel negative phase output ( ? ) 3 reg ripple ?lter pin 31 sp ampli?er l-channel negative phase output ( ? ) 4 input for pccard 32 sp ampli?er l-channel positive phase output ( + ) 5 standby on/off control 33 sp ampli?er l-channel positive phase output ( + ) 6 r-channel input 34 gnd_sp l-channel 7 main signal mute on/off control 35 sp power save control 8 v ref r-channel for volume 36 agc on level control 9 audio mix ampli?er r-channel output 37 gnd 10 volume control signal r-channel input 38 signal auto detection ampli?er r-channel input 11 r-channel output for hp ampli?er 39 signal auto detection mix ampli?er r-channel output 12 negative feedback pin for alarm mix ampli?er r-channel 40 agc demodulation pin 13 alarm mix ampli?er r-channel output 41 sp ampli?er l-channel input 14 agc r-channel output 42 gnd 15 gnd 43 agc l-channel output 16 sp ampli?er r-channel input 44 alarm mix ampli?er l-channel output 17 signal automatic detection on/off control 45 negative feedback pin for alarm mix ampli?er l-channel 18 agc on/off control 46 l-channel output for hp ampli?er 19 v ref _sp 47 volume control signal l-channel input 20 gnd 48 audio mix ampli?er l-channel output 21 demodulation pin for signal automatic detection 49 voltage output for agc level change 22 signal automatic detection output 50 signal auto detection ampli?er l-channel input 23 gnd_sp r-channel 51 signal auto detection mix ampli?er l-channel output 24 sp ampli?er r-channel positive phase output ( + ) 52 l-channel input 25 sp ampli?er r-channel positive phase output ( + ) 53 v ref 26 sp ampli?er r-channel negative phase output ( ? ) 54 input for modem 27 sp ampli?er r-channel negative phase output ( ? ) 55 gnd 28 v cc _sp r-channel 56 input for beep note) sp: speaker hp: headphone reg: regulator
an12941 a 4 sdc00056aeb absolute maximum ratings parameter symbol rating unit supply voltage *1 v cc 5.75 v v cc _sp 5.75 supply current i cc ? power dissipation *2 p d 517 mw operating ambient temperature *3 t opr ?20 to +75 c storage temperature *3 t stg ?55 to +150 c operating ambient atmospheric pressure p opr 1.013 10 5 0.61 10 5 pa operating constant gravity g opr 9 810 m/s 2 operating shock s opr 4 900 m/s 2 note) * 1 : the values under the condition the above absolute maximum ratings and the power dissipation. * 2 : t a = 75 c, the value under the condition which this device is mounted on a four -layer printed wiring board and in addition its radiation part is soldered. (reference to technical data, ? power dissipation of package hsop056-p-0300a) * 3 : except for the storage temperature and operating ambient temperature, all ratings are for t a = 25 c. recommended operating range parameter symbol rating unit supply voltage v cc 3.0 to 5.5 v v cc _sp * 3.0 to 5.5 note) * : the values under the condition the above absolute maximum ratings and the power dissipation. electrical characteristics at v cc = 5 v, v cc _sp = 5 v note) t a = 2 5 c 2 c unless otherwise speci?ed. parameter symbol conditions min typ max unit circuit current circuit current 1 a at non-signal (v cc ) i vcca v cc = 3.3 v , at non-signal, automatic distinction: on 4.4 8.7 13.0 ma circuit current 2 a at non-signal (v cc _sp) i vccsa v cc = 3.3 v , at non-signal, automatic distinction: on ? 400 600 a circuit current 1b at non-signal (v cc ) i vccb v cc = 3.3 v, at non-signal, power save: off at non-automatic distinction 4.8 9.5 14.2 ma circuit current 2b at non-signal (v cc _sp) i vccsb v cc = 3.3 v, at non-signal, power save: off at non-automatic distinction ? 8.1 16.2 ma circuit current 1c at non-signal (v cc ) i vccc v cc = 3.3 v, at non-signal, power save: on at non-automatic distinction 4.1 8.1 12.1 ma circuit current 2c at non-signal (v cc _sp) i vccsc v cc = 3.3 v, at non-signal, power save: on at non-automatic distinction ? 400 600 a
AN12941A sdc00056aeb 5 electrical characteristics at v cc = 5 v, v cc _sp = 5 v (continued) note) t a = 2 5 c 2 c unless otherwise speci?ed. parameter symbol conditions min typ max unit circuit current (continued) circuit current 1d at non-signal (v cc ) i vccd v cc = 3.3 v, at standby mode ? 10 50 a circuit current 2d at non-signal (v cc _sp) i vccsd v cc = 3.3 v, at standby mode ? 10 50 a speaker ampli?er (pin 52, pin 6 pin 24 to pin 27, pin 33 to pin 30) l-channel audio output level v ospl v in = ?22 dbv, 1 khz, r l = 8 ? 2.0 4.0 6.0 dbv r-channel audio output level v ospr v in = ?22 dbv, 1 khz, r l = 8 ? 2.0 4.0 6.0 dbv l-channel audio output distortion th spl v in = ?22 dbv, 1 khz, r l = 8 ? , to thd ?fth ? 0.04 0.5 % r-channel audio output distortion th spr v in = ?22 dbv, 1 khz, r l = 8 ? , to thd ?fth ? 0.04 0.5 % l-channel audio output noise v nspl at non-signal, r l = 8 ? , a curve ?lter ? ? 65 ? 62 dbv r-channel audio output noise v nspr at non-signal, r l = 8 ? , a curve ?lter ? ? 74 ? 68 dbv l-channel maximum output power v m8spl v in = 1 khz, at thd = 10%, r l = 8 ? to thd ?fth, at agc = off 0.7 1.0 ? w r-channel maximum output power v m8spr v in = 1 khz, at thd = 10%, r l = 8 ? to thd ?fth, at agc = off 0.7 1.0 ? w l-channel maximum output power v m4spl v in = 1 khz, at thd = 10%, r l = 4 ? to thd ?fth, at agc = off ? 2.0 ? w r-channel maximum output power v m4spr v in = 1 khz, at thd = 10%, r l = 4 ? to thd ?fth, at agc = off ? 2.0 ? w cross talk r-channel l-channel v ctspl v in = ?22 dbv, 1 khz, r l = 8 ? a curve ?lter 64 68 ? db cross talk l-channel r-channel v ctspr v in = ?22 dbv, 1 khz, r l = 8 ? a curve ?lter 64 68 ? db agc output level v agspl v agspr v in = ?6 dbv, 1 khz, rl = 8 ? a curve ?lter 5.5 7.0 8.5 dbv mix ampli?er characteristic 1 (pin 4, pin 54, pin 56 pin 46, pin 11) l-channel, r-channel output level at beep signal mix v bespl v bespr v in = ?10 dbv, 1 khz, pin 56 input ? 17 ? 16 ? 15 dbv l-channel, r-channel output level at modem signal mix v mdspl v mdspr v in = ?10 dbv, 1 khz, pin 54 input ? 17 ? 16 ? 15 dbv l-channel, r-channel output level at pccard signal mix v pcspl v pcspr v in = ?10 dbv, 1 khz, pin 4 input ? 17 ? 16 ? 15 dbv each entry pin max input level ? v in = 1 khz, v in at thd = 1% 0.6 ? ? v[rms] maximum ampli?er output for the hp ampli?er v hpmal v hpmar v in = 1 khz, v in at thd = 1% 0.3 ? ? v[rms]
an12941 a 6 sdc00056aeb electrical characteristics at v cc = 5 v, v cc _sp = 5 v (continued) note) t a = 2 5 c 2 c unless otherwise speci?ed. parameter symbol conditions min typ max unit mix ampli?er characteristic 2 (continued) (pin 56, pin 54, pin 52, pin 4, pin 6 pin 44, pin 13) l-channel, r-channel mix ampli?er cross talk in case of signal off v ofspl v ofspr v in = ?16 dbv, 1 khz pins 4, 6, 52, 54, 56: input ? ? 81 ? 75 dbv signal detection system characteristic (pin 52, pin 6, pin 54, pin 56, pin 4 pin 51, pin 39) pre-ampli?er output at l-channel input v sdtl v in = ?46 dbv, 1 khz ? 22 ? 20 ? 18 dbv pre-ampli?er output at r-channel input v sdtr v in = ?46 dbv, 1 khz ? 22 ? 20 ? 18 dbv pre-ampli?er output at beep signal input v sdtbe v in = ?46 dbv, 1 khz ? 22 ? 20 ? 18 dbv pre-ampli?er output at modem signal input v sdtmd v in = ?46 dbv, 1 khz ? 22 ? 20 ? 18 dbv pre-ampli?er output at pccard signal input v sdtpc v in = ?46 dbv, 1 khz ? 22 ? 20 ? 18 dbv detection level 1 at high sensitivity v sdtth v in = 1 khz ? 65 ? 60 ? 55 dbv distinction output high level v sdthi v in = 1 khz 2.3 3.3 ? v distinction output low level v sdtlo v in = 1 khz ? 0.1 1.0 v voltage holding mode entry signal on/off voltage range holding on v 7h ? 2.0 ? 5.0 v entry signal on/off voltage range holding off v 7l ? 0.0 ? 0.8 v agc on/off voltage range holding on v 18h ? 2.0 ? 5.0 v agc on/off voltage range holding off v 18l ? 0.0 ? 0.8 v signal automatic detection function voltage range holding on v 17h ? 2.0 ? 5.0 v signal automatic detection function voltage range holding off v 17l ? 0.0 ? 0.8 v sandby on/off voltage range holding off v 5h ? 2.0 ? 5.0 v sandby on/off voltage range holding on v 5l ? 0.0 ? 0.8 v sp ampli?er power save on/off voltage range holding off v 35h ? 2.0 ? 5.0 v sp ampli?er power save on/off voltage range holding on v 35l ? 0.0 ? 0.8 v
AN12941A sdc00056aeb 7 electrical characteristics at v cc = 5 v, v cc _sp = 5 v (continued) note) t a = 2 5 c 2 c unless otherwise speci?ed. parameter symbol conditions min typ max unit voltage holding mode (continued) sp gain high/low sw +6 db/0 db voltage range holding + 6 db v 2h ? 2.0 ? 5.0 v sp gain high/low sw +6 db/0 db voltage range holding 0 db v 2l ? 0.0 ? 0.8 v control terminal , the mode table pin no. pin name voltage of pin remarks low high 7 entry signal on/off signal off signal on ? 18 agc on/off agc off agc on ? 17 signal automatic detection function automatic distinction off automatic distinction on ? 5 standby on/off stb on stb off ? 35 sp power save on/off save on (sp off) save off (sp on) the power saving operation by pin 35 has priority over any automatic detection 2 sp gain high/low sw 0 db +6 db the gain difference is about 6 db pin no. pin name voltage of pin 0.5 v to 1.5 v 36 at the time of agc: on, it changes on level. on level: ?3 db to +3 db note) * : the holding range of control voltage is shown in page 6 to page 7 of electrical characteristics. terminal equivalent circuits pin no. equivalent circuits description corrugation and voltage 28, 29 ? v cc _sp: it is the speci?cally designed power pin of the speaker ampli?er. ? pin 28 is for r-channel ? pin 29 is for l-channel because the big electric current ?ows,it is desirable to separate from the v cc line to the other power pin on the board pattern. dc 5 v
an12941 a 8 sdc00056aeb terminal equivalent circuits (continued) pin no. equivalent circuits description corrugation and voltage 24, 25, 26, 27 30, 31, 32, 33 3.6 k ? 18 k ? pin 31 32 25 26 pin 30 33 24 27 v cc _sp (5.0 v) speaker output: it is output pins of the speaker ampli?er. it becomes btl output. the l-channel positive phase output pin: pin 32, pin 33 the l-channel negative phase output pin: pin 30, pin 31 the r-channel positive phase output pin: pin 24, pin 25 the r-channel negative phase output pin: pin 26, pin 27 to reduce voltage loss by the wire resistance in maximum output, it makes output 2 pins. also, when the speaker ampli?er saves power, too, dc voltage is maintained. the output impedance: equal to or less than 10 ? dc 2.2 v ac 4 dbv pin 32, pin 33 pin 24, pin 25 positive pin 30, pin 31 pin 26, pin 27 negative 23, 34 ? gnd: it is gnd pin for the speaker ampli?er. ? pin 23 is for r-channel ? pin 34 is for l-channel because the big electric current ?ows, it is desirable to separate from the gnd line to the other gnd pin on the board pattern. also, it isn't connected with the substrate potential in the ic. dc 0 v 22 22 45 k ? audio signal automatic detection distinction output: it outputs the distinction result of the audio signal automatic detection circuit. the output form is the open collector output from of the npn transistor. therefore, the pull rises and uses for the power by the external resistance (equal to or more than 10 k ? ). signal's there being: output high signal nothing: output low open collector output the electric current ability: equal to or more than 100 a signal nothing dc 0 v signals there being dc 3.3 v
AN12941A sdc00056aeb 9 terminal equivalent circuits (continued) pin no. equivalent circuits description corrugation and voltage 21 21 v reg (3.0 v) 90 ? 90 k ? audio automatic detecting detection pin: it connects a condenser for the peak detection. it is the circuit which detects a peak after rectifying the audio signal of the audio signal automatic detection circuit in both waves. by changing a capacity value, the time which the power saving depends on in case of the switchover which is without signal with signal's there being can be changed. signal less time: constant current source signal's there being: emitter follower the output impedance: about 200 ? signal nothing dc 0 v signals there being dc 2 v 15, 20, 37, 42, 55 ? gnd: it is the gnd pin of the signal system. it is connected with the substrate potential of the ic. pin 15, pin 42 connect with the lead frame of the ic. dc 0 v 19 19 133 k ? 137 k ? v cc _sp (5.0 v) v ref _sp: it is the standard voltage pin to ?x the dc bias of the speaker output. it connects a condenser to remove a ripple. the output impedance: about 60 k ? dc 2.2 v 17 17 45 k ? 9 k ? 27 k ? 63 k ? 9 k ? 49-pin (2.4 v) signal automatic detection function on/off control pin: we change an audio signal automatic detection function in on/off. in case of automatic detection off, it controls power saving by speaker with the manual with the power saving on/off pin. high: function on low: function off the entry impedance: the high impedance dc ?
an12941 a 10 sdc00056aeb terminal equivalent circuits (continued) pin no. equivalent circuits description corrugation and voltage 16, 41 50 k ? v ref (1.5 v) pin 16 41 speaker ampli?er entry: it is the voice input pins of the speaker ampli?er. to make offset voltage in power saving on/off changing by the speaker ampli?er ampli?er little, it combines capacity. (it makes pop noise small). pin 16 : r-channel sp ampli?er entry pin 41 : l-channel sp ampli?er entry the entry impedance: about 50 k ? dc 1.5 v ac ?16 dbv 14, 43 90 ? v reg (3.0 v) pin 14 43 agc ampli?er output: it is the output pin of the agc circuit to hold an output clip in excessive output of the speaker output. pin 14 : the agc r-channel output pin 43 : the agc l-channel output the output impedance: equal to or less than about 10 ? dc 1.5 v ac ?16 dbv 13, 44 v reg (3.0 v) v reg (3.0 v) pin 13 44 pin 12 45 18 k ? 12.7 k ? 9 k ? alarm mix ampli?er output pins: it is output pins of the mix ampli?er to mix an alarm signal and an audio signal. pin 13: r-channel output pin 44: l-channel output the output impedance: equal to or less than about 10 ? dc 1.5 v ac ?25 dbv 12, 45 alarm mix ampli?er negative feedback pins: it is the negative feedback of the mix ampli?er to mix an alarm signal and an audio signal. it is possible to adjust in the direction which lowers the gain of the mix ampli?er in putting resistance among above mentioned mix ampli?er output pins. pin 12: r-channel negative feedback pin pin 45: l-channel negative feedback pin the entry impedance: the high impedance dc 1.5 v
AN12941A sdc00056aeb 11 terminal equivalent circuits (continued) pin no. equivalent circuits description corrugation and voltage 9, 48 v reg (3.0 v) pin 9 48 4.6 k ? 4.6 k ? audio signal mix ampli?er output pin: it is the output of the mix ampli?er to mix a signal from the modem, the beep, the pccard to an audio signal. pin 9 : the r-channel output pin 48 : the l-channel output the output impedance: equal to or less than about 10 ? dc 1.5 v ac ?28 dbv 10, 47 pin 10 47 v reg (3.0 v) entry for evr : it is the ampli?er entry to adjust an output level to the hp ampli?er. it becomes the entry of the evr adjustment signal. the entry impedance: the high impedance dc ? ac ?28 dbv 7 7 90 k ? 81 k ? 126 k ? 49-pin (2.4 v) audio signal on/off changing control pin: it is the control pin which changes whether to communicate an audio signal to the ampli?er to mix an alarm signal and an audio signal. at the time of off, only an alarm audio is output from the mix ampli?er. high: signal on low: signal off the entry impedance: the high impedance dc ? 6, 52 v reg (3.0 v) 25.2 k ? 25.2 k ? v ref (1.5 v) pin 6 52 audio signal input: it enters a main audio signal. pin 6: r-channel entry pin 52: l-channel entry the entry impedance: about 45 k ? dc 1.5v ac ?22 dbv
an12941 a 12 sdc00056aeb terminal equivalent circuits (continued) pin no. equivalent circuits description corrugation and voltage 4 v reg (3.0 v) 25.2 k ? 25.2 k ? v ref (1.5 v) 4 pccard signal entry: it is the entry pin to enter a signal from the pccard. with the audio signal mix ampli?er of the following paragraph, the same signal is entered both by l-channel and r-channel. also, it has the function which is the same as the beep entry of pin 56, the modem entry by pin 54 completely. the entry impedance: about 45 k ? dc 1.5v ac ?16 dbv 3 243 k ? 207 k ? v cc (3.3 v) 3 v reg (3.0 v) 9 k ? ripple removal condenser pin for the regulator: to remove a power ripple with the regulator circuit to create the inner power (v reg ), it puts a condenser. the entry impedance: about 100 k ? dc 1.5 v 2 2 90 k ? 81 k ? 126 k ? 49-pin (2.4 v) sp gain high/low ctl : it is the terminal which controls gain 0 db/+6 db of sp output. high: +6 db low: 0 db the entry impedance: the high impedance dc ? 1 ? v cc : it is the power (v cc ) pin to supply the regulator circuit to create the inner power v reg with the voltage. it is separating from v cc _sp of pin 28, pin 29 fully inside. it is desirable to separate as far as it ?nishes coming out about the p board pattern, too. dc 3.3 v
AN12941A sdc00056aeb 13 terminal equivalent circuits (continued) pin no. equivalent circuits description corrugation and voltage 5 90 k ? 270 k ? 5 standby on/off changing sw: it changes whether or not it makes this ic an operation condition or whether or not it makes it a standby. high: the operation condition low: standby in that the power changes a connected condition to the standby, the circuit electric current can be almost made 0. the entry impedance: about 80 k ? open voltage dc 0 v 56 25.2 k ? 25.2 k ? v ref (1.5 v) 56 beep input: it is the entry pin to enter beep signal. the same signal is entered both by l-channel and r-channel with the audio signal mix ampli?er of the following paragraph. also, it has the function which is the same as the pccard signal entry by pin 4, the modem signal entry by pin 54 completely. the entry impedance: about 45 k ? dc 1.5 v ac ?22 dbv 53 180 k ? 180 k ? v reg (3.0 v) 53 v ref : with the pin to ?x the bias voltage (the operation point) of the system which the inner power (v reg ) works, it becomes 1/2v reg (v). to remove noise, it connects a condenser with the interval of between pin 53 and gnd. the entry impedance: about 80 k ? dc 1.5 v 54 25.2 k ? 25.2 k ? v ref (1.5 v) 54 v reg (3.0 v) modem input: it is the entry pin to enter a signal from the modem. with the audio signal mix ampli?er of the following paragraph, the same signal is entered both by l-channel and r-channel. also, it has the function which is the same as the pccard signal entry by pin 4, the beep signal entry by pin 56 completely. the entry impedance: about 45 k ? dc 1.5 v ac ?22 dbv
an12941 a 14 sdc00056aeb terminal equivalent circuits (continued) pin no. equivalent circuits description corrugation and voltage 39, 51 v reg (3.0 v) pin 39 51 0.9 k ? 9 k ? v ref (1.5 v) the signal detection system pre-ampli?er negative return terminal: it is the output terminal for signal detection system pre-ampli?er. the output impedance: equal to or less than about 10 ? dc 1.5 v ac ?22 dbv 38, 50 10 k ? v ref (1.5 v) pin 38, pin 50 the signal detection system pre-ampli?er input terminal: it is the input terminal for signal detection system pre-ampli?er. the entry impedance: about 10 k ? dc 1.5 v ac ?22 dbv 40 40 v reg (3.0 v) 1.8 k ? 144 k ? agc detection pin: it is the detection circuit to detect the signal level of the agc circuit of the sp output for the clip prevention. it connects a condenser for the detection. the entry impedance: unsettled dc 0 v to 1 v 18 18 90 k ? 9 k ? 17 k ? 63 k ? 9 k ? 49-pin (2.4 v) agc on/off control pin: it is the pin which controls the operating operation of the agc circuit of the sp output for the clip prevention in on/off. at the time of off, the agc circuit doesn't work. high: agc on low: agc off the entry impedance: the high impedance dc ?
AN12941A sdc00056aeb 15 terminal equivalent circuits (continued) pin no. equivalent circuits description corrugation and voltage 49 49 8.1 k ? 11.3 k ? v reg (3.0 v) dc output for the agc on level adjustment: it is an dc voltage output terminal for the agc on level adjustment. the output impedance: equal to or less than about 10 ? dc 2.4 v 36 36 it changes agc on level: it is the pin which changes the on level of agc. the entry impedance: the high impedance dc 1.5 v 35 35 45 k ? 81 k ? 128 k ? 49-pin (2.4 v) sp ampli?er power saving on/off control pin: it is the pin which controls power saving by the sp ampli?er. at the time of on in addition to the control in case of automatic distinction function off, too, power saving on by pin 50 has priority over. the entry impedance: the high impedance dc 1.3 v 8 v reg (3.0 v) 8 v ref dc 1.5 v standard bias source for evr: it is possible to use as gnd (the dc bias source) ac when connecting external evr. it is possible to attenuate in the ac signal without cutting a signal system in "c". the output impedance: equal to or less than about 10 ? dc 1.5 v
an12941 a 16 sdc00056aeb terminal equivalent circuits (continued) pin no. equivalent circuits description corrugation and voltage 11 , 46 v reg (3.0 v) pin 11 46 output pins for the hp ampli?er: it is output pins for the external hp ampli?er. the signal which was adjusted in the volume in evr can be output by the low impedance. the output impedance: equal to or less than about 10 ? dc 1.5 v ac ?28 dbv
AN12941A sdc00056aeb 17 application notes ? circuit descriptions 1 . input inverting ampli?er and signal mix circuit block ? input inverting ampli?er block 1 ) the input impedance of each input pin is about 50 k ? . 2 ) each input impedance is 10 % of variation exists by diffusion variation. 3 ) the gain of the input part is able to lowered by adding resistance to input pin in series. when addition resistance is set to ra (k ? ) ga = 25.2 50 + ra ? signal mix circuit block 1 ) it is added (mix) in the inverting ampli?er method. mix ratio is 1 to 1 for each input. 2 ) connect volume to this mix ampli?er output, allowing you to vary the next stage input level. 3 ) pin 8 is the v ref output pin for volume reference. 25.2 k ? 25.2 k ? 25.2 k ? 25.2 k ? 25.2 k ? 25.2 k ? 25.2 k ? 25.2 k ? 25.2 k ? 25.2 k ? mix mix mix mix mix mix r-channel l-channel 0 db 0 db v ref v ref it becomes the volume for sound control by external resistance change. gain is 0 db at maximumvolume. it adds to the main audio signals in inverting amplifier form. mix ratio is 1 to 1. signal from pccard beep signal signal from modem v ol.out audio signal external volume external volume v ol.out audio signal audio signal l-channel input audio signal r-channel input modem signal input beep input pccard input 52 4 56 8 6 9 48 8 47 46 10 11 0db 0db 54
an12941 a 18 sdc00056aeb application notes (continued) 2 . signal detection system mix circuit block ? signal detection system mix circuit block 1 ) each input signal in accordance with mix ratio of 1 to 1. signals are detected by separate systems to prevent cancellation in the case of negative phase input for main signal r-channel and l-channel. ? main audio signal l-channel ? main audio signal r-channel ? beep signal ? signal from pccard ? signal from modem 2 ) signal detection sensitivity can be adjusted with 10 k ? external resistance connected between pin 50 and pin 51 or pin 38 and pin 39. 3 ) the signals input via pin 38 and pin 50 ?rst undergo double-wave recti?cation, and then peak detection is performed using the external condensor connected to pin 21. 10 k ? 10 k ? 10 k ? 10 k ? 0.47 f 0.47 f 0.047 f signal detection audio signal l-channel input modem signal input beep input audio signal r-channel input pccard input 52 54 56 2 6 51 50 39 38 21 note) adjust the detection sensitivity using 10 k ? external resistance. if noise is high for the set, use more than 10 k ? (between about 10 k ? and 200 k ? ).
AN12941A sdc00056aeb 19 application notes (continued) 2 . signal detection system mix circuit block (continued) detection sensitivity threshold values vs. external resistance ? 70 ? 60 ? 50 ? 40 1 1 0 100 1 000 detection threshold value (l-channel) detection threshold value vs. resistance constant (l-channel) between pin 50 and pin 51 detection threshold value (l-channel input level) (dbv ) resistance constant (between pin 50 and pin 51) (k ? ) ? power save of speaker power ampli?er 1 ) when input signal level is lower than a certain value due to signal automatic detection circuit, power save of speaker power amp will be operated. 2 ) this automatic detecting function is able to stopped by pin 17. 3 ) when the automatic detection is off, it control manual control by pin 35. 4 ) also when the automatic detection is on, manual power save on is prioritized. when it control only the automatic detecting function, set pin 35 to power save off. ? signal detecting distinction output 1 ) the result of automatic signal detection is output from pin 22. 47 k ? 0.047 f signal detection v cc v cc v cc automatic signal detection function on/of f automatic signal detection monitor pin power save on/of f power save of speaker power amplifier 51 50 39 38 21 17 22 35
an12941 a 20 sdc00056aeb application notes (continued) 3 . main signal on/off change and alarm signal mix circuit block ? main signal on/off circuit 1 ) the speaker ampli?er section is set to mute when main signal is off. 2 ) high: signal on , low: signal off ? main signal level adjustment 1 ) the gain of this inverting ampli?er can be reduced by adding external resistance in parallel between pin 12 and pin 13 or pin 44 and pin 45. when addition resistance is set to rd (k ? ) gd = 18 (9 + rd) 12.7 (18 + 9 + rd) 12.7 k ? 18 k ? 9 k ? 9 k ? 18 k ? 12.7 k ? v cc rd rd + 9 db +3 db + 9 db +3 db 3 db 3 db agc agc headphone v ref v ref headphone mute 9 10 11 8 12 13 14 48 8 47 46 45 44 43 7
AN12941A sdc00056aeb 21 application notes (continued) 4 . signal detection system mix circuit block ? agc detection 1 ) the signal inputted from pin 41 and pin 16 is recti?ed on both waves and then mixed with l + r. 2 ) the above signal is peak-detected by the external part of pin 40 . external is giving double-detection constant. 3 ) when the voltage of pin 40 is equal or more than 0.7 v, agc is on. + 9 db + 3 db + 9 db + 3 db agc agc agc on/of f agc detection 2.4 v for setting agc level 44 43 41 36 49 40 13 18 14 16 ? the output wave at the time of agc operation it is the following output wave form chart at the agc operation time. graph showing output wave when identical sound signals are input to two an 12941 a ics, one with agc set to off and the other with agc set to on. using identical input signals, v cc , v cc _sp = 5 v r l = 8 ? agc off agc on
an12941 a 22 sdc00056aeb application notes (continued) 5 . speaker ampli?er circuit block ? dc shift circuit 1 ) shift circuit operating point of signal (bias voltage at a no signal) from v ref to v ref _sp. dc voltage (speaker output) of output becomes v ref _sp. ? speaker ampli?er 1 ) speaker ampli?er is btl ampli?er system of 2-channel. ? 10 dbv 50 k ? 50 k ? 0 db 0 db 0 db v ref out-l (sp) out-r (sp) 4 ? to 8 ? 4 ? to 8 ? ? 10 dbv 0 db 0 db 0 db v ref power save power save dc shift dc shift muted in sync with power save of speaker amplifier . an operating point is shifted from v ref to v ref _sp . 41 30 31 33 32 16 43 14 26 27 24 25 6 . control order at power supply on/off chcange ? power supply on when switching power on, it is recommended to use a speaker ampli?er during a transient period from power on till a stable condition of a circuit to ensure that a circuit start up smoothly by protecting from any shock noise of a speaker circuit. 1 ) control order 1 . power supply (v cc _sp, v cc ): change off to on 2 . standby control: change on to off 3 . speaker ampli?er power save control: change on to off
AN12941A sdc00056aeb 23 application notes (continued) 6 . control order at power supply on/off change (continued) ? power supply on (continued) 2 ) control timing v cc_ sp (pin 28, pin 29) v cc (pin 1) * 1 standby control (pin 5) speaker pawer save control (pin 35) power supply on standby control reset (control voltage: change low to high) speaker pawer save control reset (control voltage: change low to high) time difference: equal to or more than 1.0 sec standby reset after v cc_ sp and v cc reach normal voltage time difference would not cause any abnormality at v cc_ sp and v cc atart up note) * 1 : time covering from standby control cancellation until a circuit stabilization to normal state. it depends on the capacitance connected to reference voltage (v ref , v ref _sp) pin. it is recommendation value of 4.7 f. ? power supply off when switching power off, it is recommended to take the order of ?rst applying power save control to a speaker ampli?er so that a circuit transient change may not effect on a speaker output. 1 ) control order 1 . speaker ampli?er power save control: change off to on 2 . standby control: change off to on 3. power supply (v cc _sp, v cc ): change on to off
an12941 a 24 sdc00056aeb application notes (continued) 6 . control order at power supply on/off chcange (continued) ? power supply off (continued) 2 ) control timing v cc_ sp (pin 28, pin 29) v cc (pin 1) standby control (pin 5) speaker pawer save control (pin 35) speaker pawer save control on (control voltage: change high to low) standby control on (control voltage: change high to low) power supply off time difference would not cause any abnormality at v cc_ sp and v cc atart down time difference: equal to or more than 100 msec time difference: equal to or more than 100 msec ? after power supply start up (usual operating condition) shock noise is likely to occur if you switch a standby control without applying a speaker power save. therefore, do not forget to apply speaker save before switching to standby control. 7 . power dissipation of package hsop056-p-0300a p d ? t a power dissipation p d (w) 0.000 1.000 2.000 1.572 3.000 4.000 5.000 4.280 0 2 5 150 125 ambient temperature t a (c) 50 75 100 mounted on stndard board (50 50 0.8 mm 3 ) r th(j-a) = 79.5c/w mounted on four layers of stndard board (50 50 0.8 mm 3 ) r th(j-a) = 29.2c/w independent ic without a heat sink r th( j-a) = 144.9c/w 0.862 note) the above characteristic is a reference value in case of design and is not a guarantee value.
AN12941A sdc00056aeb 25 application notes (continued) ? main characteristics 1) i/o characteristics, frequency characteristics ( 1 ) sp i/o level, distortion characteristics (r-channel, l-channel) agc = off, automatic detection = on, sp gain setting = high, v cc = 3.3 v, v cc _sp = 5.0 v, input frequency = 1 khz, r-out = 8 ?, hpf: 400 hz, lpf: 30 khz
an12941 a 26 sdc00056aeb application notes (continued) ? main characteristics (continued) 1) i/o characteristics, frequency characteristics (continued) ( 1 ) sp i/o level, distortion characteristics (r-channel, l-channel) (continued) agc = off, automatic detection = on, sp gain setting = low, v cc = 5.0 v, v cc _sp = 5.0 v, input frequency = 1 khz, hpf: 400 hz, lpf: 30 khz
AN12941A sdc00056aeb 27 application notes (continued) ? main characteristics (continued) 1) i/o characteristics, frequency characteristics (continued) ( 2 ) sp i/o level, distortion characteristics (beep) agc = off, automatic detection = off, sp gain setting = high, v cc = 3.3 v, v cc _sp = 5.0 v, input frequency = 1 khz, hpf: 400 hz, lpf: 30 khz
an12941 a 28 sdc00056aeb application notes (continued) ? main characteristics (continued) 1) i/o characteristics, frequency characteristics (continued) ( 3 ) sp frequency level, distortion characteristics (r-channel, l-channel) agc = off, automatic detection = on, sp gain setting = high, v cc = 3.3 v, v cc _sp = 5.0 v, input level = ?22 dbv
AN12941A sdc00056aeb 29 application notes (continued) ? main characteristics (continued) 1) i/o characteristics, frequency characteristics (continued) ( 3 ) sp frequency level, distortion characteristics (r-channel, l-channel) (continued) agc = off, automatic detection = on, sp gain setting = low, v cc = 5.0 v, v cc _sp = 5.0 v, input level = ?16 dbv
an12941 a 30 sdc00056aeb application notes (continued) ? main characteristics (continued) 1) i/o characteristics, frequency characteristics (continued) ( 4 ) sp frequency level, distortion characteristics (beep) agc = off, automatic detection = off, sp gain setting = high, v cc = 3.3 v, v cc _sp = 5.0 v, input level = ?22 dbv
AN12941A sdc00056aeb 31 application notes (continued) ? main characteristics (continued) 1) i/o characteristics, frequency characteristics (continued) ( 5 ) sp ? agc i/o level, distortion characteristics (r-channel, l-channel) agc = on, automatic detection = on, v cc = 3.3 v, v cc _sp = 5.0 v, input frequency = 1 khz, r-out = 8 ?, hpf: 400 hz, lpf: 30 khz
an12941 a 32 sdc00056aeb application notes (continued) ? main characteristics (continued) 1) i/o characteristics, frequency characteristics (continued) ( 6 ) sp ? agc frequency level, distortion characteristics (r-channel, l-channel) agc = on, automatic detection = on, v cc = 3.3 v, v cc _sp = 5.0 v, input frequency = 1 khz, r-out = 8 ?, hpf: 400 hz, lpf: 30 khz
AN12941A sdc00056aeb 33 application notes (continued) ? main characteristics (continued) 1) i/o characteristics, frequency characteristics (continued) ( 7 ) mix ampli?er i/o level, distortion characteristics (r-channel, l-channel) agc = off, automatic detection = off, sp power save, v cc = 3.3 v, v cc _sp = 5.0 v, input frequency = 1 khz, hpf: 400 hz, lpf: 30 khz
an12941 a 34 sdc00056aeb application notes (continued) ? main characteristics (continued) 1) i/o characteristics, frequency characteristics (continued) ( 8 ) mix ampli?er frequency level, distortion characteristics (r-channel, l-channel) agc = off, automatic detection = off, sp power save, v cc = 5.0 v, v cc _sp = 5.0 v, input level = ?10 dbv
AN12941A sdc00056aeb 35 application notes (continued) ? main characteristics (continued) 2 ) v cc , temperature variation characteristics ( 1 ) sp output level, distortion characteristics (r-channel, l-channel) agc = off, automatic detection = off, sp gain setting = high, v cc _sp = 5.0 v, v in = ?22 dbv input frequency = 1 khz, r l = 8 ?, hpf: 400 hz, lpf: 30 khz
an12941 a 36 sdc00056aeb application notes (continued) ? main characteristics (continued) 2 ) v cc , temperature variation characteristics (continued) ( 1 ) sp output level, distortion characteristics (r-channel, l-channel) (continued) agc = off, automatic detection = off, sp gain setting = high, v cc _sp = 5.0 v, v in = ?22 dbv input frequency = 1 khz, r l = 4 ?, hpf: 400 hz, lpf: 30 khz
AN12941A sdc00056aeb 37 application notes (continued) ? main characteristics (continued) 2 ) v cc , temperature variation characteristics (continued) ( 2 ) sp maximum output level characteristics (r-channel, l-channel) agc = off, automatic detection = off, sp gain setting = high, v cc _sp = 5.0 v input frequency = 1 khz, r l = 8 ?, hpf: 400 hz, lpf: 30 khz
an12941 a 38 sdc00056aeb application notes (continued) ? main characteristics (continued) 2 ) v cc , temperature variation characteristics (continued) ( 3 ) sp ? agc output level characteristics (r-channel, l-channel) agc = on, automatic detection = off, sp gain setting = high, v cc _sp = 5.0 v, p36 = 1.05 v v in = ?6 dbv, input frequency = 1 khz, r l = 8 ?, hpf: 400 hz, lpf: 30 khz
AN12941A sdc00056aeb 39 application notes (continued) ? main characteristics (continued) 2 ) v cc , temperature variation characteristics (continued) ( 4 ) mix ampli?er output level, distortion characteristics (r-channel, l-channel) agc = off, automatic detection = off, sp power save, v cc _sp = 5.0 v v in = ?10 dbv, input frequency = 1 khz, hpf: 400 hz, lpf: 30 khz
an12941 a 40 sdc00056aeb application notes (continued) ? main characteristics (continued) 2 ) v cc , temperature variation characteristics (continued) ( 5 ) signal detection threshold value (r-channel, l-channel) agc = off, automatic detection = on, v cc _sp = 5.0 v input frequency = 1 khz, hpf: 400 hz, lpf: 30 khz
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