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analog signal processor (asp) for cd players overview the LA9240M is an analog signal processing and servo control bipolar ic designed for use in compact disc players; a compact disc player can be configured by combining this ic with a cd-dsp such as the lc78622e and lc78620e, with a small number of additional components required. functions i/v amplifier, rf amplifier (with agc), slc, apc, fe, te (with vca and auto-balance function), focus servo amplifier (with offset cancellation function), tracking servo amplifier (with offset cancellation function), spindle servo amplifier (with gain switching function), sled servo amplifier (with off function), focus detection (drf, fzd), track detection (hfl, tes), defect detection, and shock detection. features . the following automatic adjustment functions are built in. . focus offset auto cancel: fe (pin 20) . tracking offset auto cancel: te (pin 7) . ef balance auto adjustment . rf level agc function . tracking servo gain rf level following function . focus search smoothing setting pin: fsc (pin 46) . ef balance adjustment variable range setting pin: tbc (pin 47) . focus search mode switching pin: fss (pin 55) package dimensions unit : mm 3159-qfp64e [LA9240M] sanyo : qip64e specifications maximum ratings at ta = 25c, pins 22, 45 = gnd parameter symbol conditions ratings unit maximum supply voltage v cc max pin 56, 64 7 v allowable power dissipation pd max 350 mw operating temperature topr 25 to +75 c storage temperature tstg 40 to +150 c ordering number: en 5482a monolithic linear ic LA9240M sanyo electric co.,ltd. semiconductor bussiness headquarters tokyo office tokyo bldg., 1-10, 1 chome, ueno, taito-ku, tokyo, 110 japan 83097ha(ii)/83096ha(ii) no.5482 - 1/20
operating conditions at pins 22, 45 = gnd parameter symbol conditions ratings unit recommended supply voltage v cc 5v operating supply voltage v cc op 3.6 to 5.5 v * operating supply voltage at limit of operating temperature at pins 22, 45 = gnd parameter symbol conditions ratings unit operating temperature topr2 5 to +75 c operating supply voltage v cc op2 set resistance r between dsp and clk interface to 5.1 k w 3.4 to 5.5 v operating characteristics at ta = 25c, pins 22, 45 = gnd, v cc (pins 56, 64) = 5 v parameter symbol conditions min typ max unit current drain i cco v cc 1 (pin 64) + v cc 2 (pin 56) 22 32 42 ma reference voltage v ref vr 2.3 2.5 2.7 v [interface] ce-vth cevth ce 0.8 v cl-vth clvth cl 0.8 v dat-vth datvth dat 0.8 v maximum cl frequency clmax 500 khz [rf amplifier] rfsm no signal voltage rfsmo 1.35 1.60 1.85 v minimum gain rfsm g min fin1, fin 2:1m w -input, ph 1=4v freq = 200 khz, rfsm 14.0 12.5 11.0 db [focus amplifier] fdo gain fd g fin2:1m w -input, fdo 3.5 5.0 6.5 db fdo offset fdost difference from reference voltage, servo on 170 0 +170 mv off time offset fdofost difference from reference voltage, servo off 40 0 +40 mv offset adjustment step festep fe 3 mv f search voltage h1 fsmax1 fdo, fss = gnd 0.8 v f search voltage l1 fsmin1 fdo, fss = gnd 0.8 v f search voltage h2 fsmax2 fdo, fss = v cc 0.8 v f search voltage l2 fsmin2 fdo, fss = v cc 0v [tracking amplifier] te gain max te g max f = 10 khz, e: 1 m w -input, ph 1=4v 6.0 7.5 9.0 db te gain min te g min f = 10 khz, e: 1 m w -input, ph 1=1v 0.5 +1.8 +4.0 db te?3 db tefc e: 1 m w -input 60 khz to gain to g th ? to gain, thld mode 4.0 6.0 8.0 db tgl offset tglost servo on, tgl = h, to 250 0 +250 mv tgh offset tghost tgl = l, difference from tgl offset, to 50 0 +50 mv thld offset thldost thld mode, difference from tgl offset, to 50 0 +50 mv off 1 offset off1ost toff = h 50 0 +50 mv off 2 offset off2ost toff2 off (if) 50 0 +50 mv offset adjustment step testep te 30 mv balance range h bal-h d gain e/f input, t b=5v,tbc= open 3.5 db balance range l bal-l d gain e/f input, t b=0v,tbc= open 3.5 db toff-vth toffvth 1.0 2.5 3.0 v tgl-vth tglvth 1.0 2.5 3.0 v [ph] no signal voltage pho difference from rfsm 0.85 0.65 0.45 v [bh] no signal voltage bho difference from rfsm 0.45 0.65 0.85 v [drf] detection voltage drfvth difference from vr at rfsm 0.60 0.35 0.20 v output voltage h drf-h 4.5 4.9 v output voltage l drf-l 0 +0.5 v continued on next page. LA9240M no.5482 - 2/20
continued from preceding page. parameter symbol conditions min typ max unit [fzd] detection voltage 1 fzd1 fe, difference from vr 0 +0.2 v detection voltage 2 fzd2 fe, difference from vr 0 v [hfl] detection voltage hflvth difference from vr at rfsm 0.55 0.4 0.25 v output voltage h hfl-h 4.5 4.9 output voltage l hfl-l 0 +0.5 v [tes] detection voltage lh tes-lh tesi, difference from vr 0.15 0.10 0.05 v detection voltage hl tes-hl tesi, difference from vr 0.05 0.10 0.15 v output voltage h tes-h 4.5 4.9 v output voltage l tes-l 0 +0.5 v [jp] output voltage h jp-h difference from jp + =0v,jp =0vatjp + =0v, jp =5v,to 0.35 0.5 0.65 v output voltage l jp-l difference from jp + =0v,jp =0vatjp + =5v, jp =0v,to 0.65 0.5 0.35 v [spindle amplifier] offset 12 spd12ost difference from vr at spd, 12 cm mode 40 0 +40 mv offset 8 spd8ost difference from vr at spd, 8 cm mode 40 0 +40 mv offset off spdof difference from vr at spd, off mode 30 0 +30 mv output voltage h12 spd-h12 difference from offset-12, 12 cm mode cv + =5v,cv =0v 0.75 1.0 1.25 v output voltage l12 spd-l12 difference from offset-12 , 12 cm mode cv + =0v,cv =5v 1.25 1.0 0.75 v output voltage h8 spd-h8 difference from offset-8, 8 cm mode cv + =5v,cv =0v 0.35 0.5 0.65 v [sled amplifier] sleq offset sleqost difference from to at sleq 30 0 +30 mv offset sld sldost sleq = vr, difference from vr 100 0 +100 mv offset off sldof off mode 40 0 +40 mv off vth slofvth slof 1.0 1.4 2.0 v [slc] no signal voltage slco slc 2.25 2.5 2.75 v [shock] no signal voltage scio sci, difference from vr 40 0 +40 mv detection voltage h scivthh sci, difference from vr 60 100 140 mv detection voltage l scivthl sci, difference from vr 140 100 60 mv [def] detection voltage defvth difference between lf2 voltage when rfsm = 3.5 v and def is detected and lf2 voltage when rfsm = 3.5 v 0.20 0.35 0.50 v output voltage h def-h 4.5 4.9 v output voltage l def-l 0 +0.5 v [apc] reference voltage lds lds voltage at which ld d=3v 150 180 210 mv off voltage lddof ldd 3.9 4.3 4.6 v LA9240M no.5482 - 3/20
pin functions pin no. symbol contents 1 fin2 pickup photodiode connection pin. added to fin1 pin to generate the rf signal, subtracted from fin1 pin to generate the fe signal. 2 fin1 pickup photodiode connection pin. 3 e pickup photodiode connection pin. subtracted from f pin to generate the te signal. 4 f pickup photodiode connection pin. 5 tb te signal dc component input pin. 6te ? pin which connects the te signal gain setting resistor between this pin and te pin. 7 te te signal output pin. 8 tesi tes (track error sense) comparator input pin. the te signal is input through a bandpass filter. 9 sci shock detection input pin. 10 th tracking gain time constant setting pin. 11 ta ta amplifier output pin. 12 td ? pin for configuring the tracking phase compensation constant between the td and vr pins. 13 td tracking phase compensation setting pin. 14 jp tracking jump signal (kick pulse) amplitude setting pin. 15 to tracking control signal output pin. 16 fd focusing control signal output pin. 17 fd ? pin for configuring the focusing phase compensation constant between the fd and fa pins. 18 fa pin for configuring the focusing phase compensation constant between the fd ? and fa ? pins. 19 fa ? pin for configuring the focusing phase compensation constant between the fa and fe pins. 20 fe fe signal output pin. 21 fe ? pin which connects the fe signal gain setting resistor between this pin and fe pin. 22 agnd analog signal gnd. 23 sp cv + and cv ? pins input signal single-end output. 24 spi spindle amplifier input. 25 spg 12-cm spindle mode gain setting resistor connection pin. 26 sp ? spindle phase compensation constant connection pin, along with the spd pin. 27 spd spindle control signal output pin. 28 sleq sled phase compensation constant connection pin. 29 sld sled control signal output pin. 30 sl ? input pin for sled movement signal from microprocessor. 31 sl + input pin for sled movement signal from microprocessor. 32 jp ? input pin for tracking jump signal from dsp. 33 jp + input pin for tracking jump signal from dsp. 34 tgl input pin for tracking gain control signal from dsp. gain is low when tgl is high. 35 toff input pin for tracking off control signal from dsp. tracking servo is off when toff is high. 36 tes output pin for tes signal to dsp. 37 hfl the high frequency level is used to determine whether the main beam is positioned over a bit or over the mirrored surface. 38 slof sled servo off control input pin 39 cv ? input pin for clv error signal from dsp. 40 cv + input pin for clv error signal from dsp. 41 rfsm rf output pin. 42 rfs ? rf gain setting and efm signal 3t compensation constant setting pin, along with the rfsm pin. 43 slc slice level control is an output pin that controls the data slice level used by the dsp for the rf waveform. 44 sli input pin used by dsp for controlling the data slice level. 45 dgnd digital system gnd pin. 46 fsc focus search smoothing capacitor output pin. 47 tbc tracking balance control; ef balance adjustment variable range setting pin 48 nc no connection 49 def disc defect detection output pin. 50 clk reference clock input pin. 4.23 mhz signal from the dsp is input. 51 cl microprocessor command clock input pin. continued on next page. LA9240M no.5482 - 4/20
continued from preceding page. pin no. symbol contents 52 dat microprocessor command data input pin. 53 ce microprocessor command chip enable input pin. 54 drf rf level detection output (detect rf). 55 fss focus search select; focus search mode ( search/+search vs. the reference voltage) switching pin 56 v cc 2 servo system and digital system v cc pin. 57 refi by-pass capacitor connection pin for reference voltage. 58 vr reference voltage output pin. 59 lf2 disc defect detection time constant setting pin. 60 ph1 rf signal peak hold capacitor connection pin. 61 bh1 rf signal bottom hold capacitor connection pin. 62 ldd apc circuit output pin. 63 lds apc circuit input pin. 64 v cc 1 rf system v cc pin. LA9240M no.5482 - 5/20
equivalent circuit block diagram LA9240M no.5482 - 6/20
test circuit LA9240M LA9240M no.5482 - 7/20
description of operation 1. apc (auto laser power control) this circuit controls the pickup laser power. the laser is turned on and off by commands from the microprocessor. 2. rf amplifier (eye pattern output) the pickup photodiode output current (a + c) is input to fin2 (pin 1), and (b + d) is input to fin1 (pin 2). the current that is input is converted to the voltage, passes through the agc circuit, and is then output from the rfsm amplifier output rfsm (pin 41). the internal agc circuit has a variable range of 3 db, and the time constant can be changed through the external capacitor connected to ph1 (pin 60). in addition, this circuit also controls the bottom level of the efm signal (rfsm output), and the response can be changed through the external capacitor connected to bh1 (pin 61). the center gain setting for the agc variable range is set by the resistance between rfsm (pin 41) and rfs ? (pin 42); if necessary, this resistance is also used for 3t compensation for the efm signal. 3. slc (slice level control) the slc sets the duty ratio for the efm signal that is input to the dsp to 50%. the dc level is determined by integrating the efmo signal output from the dsp to determine the duty factor. 4. focus servo the focus error signal is derived by detecting the difference between (a + c) and (b + d), which is (b + d) ? (a + c), and is then output from fe (pin 20). the focus error signal gain is set by the resistance between fe (pin 20) and fe ? (pin 21). offset cancellation is performed by the fe amplifier. ``offset cancellation'' cancels the offset for the ic's internal iv amplifier, etc. adjustment is initiated by the focus-offset adjust start command, and terminates after about 30 ms. the focus-offset adjust off command is used to return to the state before offset cancellation. the fa amplifier is the pickup phase compensation amplifier, and the equalizer curve is set by the external capacitor and resistance. furthermore, this amplifier has a mute function which is applied when v cc is turned on, when the f-servo off command is sent, and during f-search. in order to turn the focus servo on, send either the laser on command or the f-servo on command. the fd amplifier has a phase compensation circuit, and a focus search signal composition function and is completed in about 560 ms. focus search is initiated by the f-search command, and a ramp waveform is generated by the internal clock. this waveform is used for focus detection (focus zero cross) with the focus error signal and then turn the focus servo on. the ramp waveform amplitude is set by the resistance between fd (pin 16) and fd ? (pin 17). fsc (pin 46) is for smoothing the focus search ramp waveforms, and a capacitor is connected between fsc and ref. fss (pin 55) is the focus search mode switching pin. if fss is shorted with v cc , the ``+ search'' is set; if fss is left open or is shorted with gnd, the `` search'' is set. 5. tracking servo the pickup photodiode output current is input to e (pin 3) and f (pin 4). the current that is input is converted to the voltage, passes through the balance adjustment vca circuit and then the vca circuit that follows the gain in the rfagc circuit, and is then output from te (pin 7). the tracking error gain is set by the resistance between te ? (pin6) and te (pin7). offset cancellation is performed by the te amplifier. offset cancellation terminates after about 30 ms. the track-offset adjust off command is used to return to the state before the offset. the th amplifier alters the servo response characteristics according to the thld signal, etc., generated internally after detection of the tgl signal from the dsp or the jp signal. when a defect is detected, the thld mode goes into effect internally. to avoid this, short def (pin 49) to l = gnd. by inserting an external bandpass filter to remove the shock component from the tracking error signal at sci (pin 9), the gain is automatically boosted when a defect is detected. the ta output (pin 11) has a built-in resistance to allow configuration of a low-pass filter. the td amplifier performs servo loop phase compensation; the characteristics are set by external cr. furthermore, this amplifier has a mute function, which is applied when v cc is turned on or the track-servo off command is issued. the muting function is released by the track-servo on command. the toff amplifier that is positioned immediately after td (pin 13) functions to turn off the servo in response to the toff signal from the dsp. the to amplifier has a jp pulse composition function. the jp pulse is set by jp (pin 14). (thld detection is performed internally.) 6. sled servo the response characteristics are set by sleq (pin 28). the amplifier positioned after sleq (pin 28) has a mute function that is applied either when slof (pin 38) goes high or the sled off command is issued. the sled is moved by inputting current to sl ? (pin 30) and sl + (pin 31); specifically, the pins are connected to the microprocessor output ports via resistors, and the movement gain is set by the resistance value of that resistor. it is important to note that if there is a deviation in the resistance values for sl ? (pin 30) and sl + (pin 31), an offset will arise in the sld output. 7. spindle servo this configures the servo circuit, which maintains the linear velocity of the disc at a constant speed, along with the dsp. this circuit accepts signals from the dsp through cv ? (pin 39) and cv + (pin 40) and sets the equalizer characteristics through sp (pin 23), sp ? (pin 26), and spd (pin 27), which are output to spd (pin 27). the 12-cm mode amplifier gain is set by the resistor connected between spg (pin 25) and the reference voltage. in 8-cm mode, this amplifier serves as an internal buffer, and spg (pin 25) is ignored. note that the gain setting is made for 8-cm mode first, and then 12-cm mode. if spg (pin 25) is left open, the gain is forcibly set for 8-cm mode, regardless of whether 8-cm or 12-cm mode is in effect. LA9240M no.5482 - 8/20
8. tes and hfl (traverse signals) when moving the pickup from the outer track to the inner track, the ef output from the pickup must be connected so that the phase relationship of tes and hfl is as shown in the diagram below. for the tesi input, the tes comparator has negative polarity and hysteresis of approximately 100 mv. an external bandpass filter is needed in order to extract only the required signal from the te signal. 9. drf (luminous energy determination) drf goes high when the peak of the efm signal (rfsm output) held by the ph1 (pin 60) capacitor exceeds approximately 2.1 v. the ph1 (pin 60) capacitor affects the drf detection time constant and the rfagc response bidirectional setting. the drf output is driven by a constant current (250 a). pickup position focus 10. focus determination focus is assumed to be obtained when the focus error signal s curve reaching ref + 0.2 v is detected, and the s curve subsequently returns to ref. focus LA9240M no.5482 - 9/20
11. defect the mirrored surface level is maintained by the capacitor for lf2 (pin 59); when a drop in the efm signal (rfsm output) reaches 0.35 v or more, a high signal is output to def (pin 49). if def (pin 49) goes high, the tracking servo enters thld mode. in order to prevent the tracking servo from entering thld mode when a defect is detected, prevent defect from being output by either shorting def (pin 49) to gnd, or shorting lf2 (pin 59) to gnd. the defect output is driven by constant current (approximately 100 a). 12. microprocessor interface because the reset (nothing) command initializes the LA9240M, it must be used carefully. the LA9240M command acceptance (mode switching) timing is defined by the internal clock (4.23 mhz divided to 130 khz) after the falling edge of ce (rwc); therefore, when commands are sent consecutively, ce must go low for at least 10 sec. the 4.23 mhz clock is required for that reason. 2byte-command detect and 2byte-command reset are used only for the purpose of masking two-byte data. all instructions can be input by setting ce high and sending commands synchronized with the cl clock from the microprocessor to dat (pin 52) in lsb first format. note that the command is executed at the falling edge of ce. 13. reset circuit the power-on reset is released when v cc exceeds approximately 2.8 v. 14. pattern design notes to prevent signal jump-in from cv + (pin 40) to rfsm (pin 41), a shielding line is necessary in between. 15. v cc /ref/gnd/nc v cc 1 (pin 64) : rf system v cc 2 (pin 56) : servo system, digital system agnd (pin 22) : rf system, servo system dgnd (pin 45) : digital system nc (pin 48) : no connection vr (pin 58) : reference voltage efm signal (rfsm output) lf2 (pin 59) def (pin 49) timing * the dsp pin names are shown in parentheses. LA9240M no.5482 - 10/20
microprocessor command list msb lsb command reset mode power-on mode dsp 00000000 reset reset(nothing) 00001000 focus start focus start #1 11110000 11111000 11111111 2byte-command detect 2byte-command detect 2byte-command reset 2byte-command detect 2byte-command detect 2byte-command reset 10010000 focus-offset adjust start e 10010001 focus-offset adjust off v e 10010010 track-offset adjust start e 10010011 track-offset adjust off v e 10010100 10010101 laser on laser off : f-servo on e e 10010110 laser off : f-servo off v e 10010111 spindle 8cm e 10011000 spindle 12 cm v e 10011001 spindle off e 10011010 sled on v e 10011011 sled off e 10011100 e/f balance start non-adjusted e 10011101 track-servo off v e 10011110 track-servo on e notes concerning microprocessor program creation 1. commands after sending the focus start command and the e/f balance start command, send 11111110 (feh) in order to clear the internal registers of the ic. reason: although the above commands are executed at point 1 in the timing chart below, the same commands will be executed again at point 2 if there is subsequent input to ce as shown below. when sending a track-offset adjust start command or a focus-offset adjust start command after either v cc on (power on reset), reset command, or a corresponding offset adjust off command, waiting time is necessary as listed below. (only when a 4.2 mhz clock is input.) track-offset adjust start: 4 ms or more focus-offset adjust start: 4 ms or more 2. e/f balance adjustment e/f balance adjustments should be made in a bit region of the disc, not a mirrored region. since there is no track-kick for LA9240M, measures must be taken during ef balance adjustment to obtain a stable te signal. (by a sled movement signal from a microprocessor, for example.) timing 2 s or more 1 s or more 10 s or more 1 s or more 2 s or more ``focus start'' command ``e/f balance start'' command LA9240M no.5482 - 11/20
pin internal equivalent circuit pin no. pin name internal equivalent circuit 1 2 fin2 fin1 3 4 e f 5 6 17 21 26 28 44 tb te fd ? fe ? sp ? sleq sli 16 27 43 fd spd slc 8 36 tesi tes continued on next page. LA9240M no.5482 - 12/20
continued from preceding page. pin no. pin name internal equivalent circuit 9 34 sci tgl 7 10 te th 11 12 ta td ? 13 td continued on next page. LA9240M no.5482 - 13/20
continued from preceding page. pin no. pin name internal equivalent circuit 14 jp 15 to 18 19 20 fa fa ? fe continued on next page. LA9240M no.5482 - 14/20
continued from preceding page. pin no. pin name internal equivalent circuit 24 25 spi spg 29 30 31 sld sl ? sl + 32 33 jp ? jp + 35 toff continued on next page. LA9240M no.5482 - 15/20
continued from preceding page. pin no. pin name internal equivalent circuit 37 46 49 54 hfl fsc def drf 38 slof 39 40 23 cv ? cv + sp 42 rfs ? 47 tbc continued on next page. LA9240M no.5482 - 16/20
continued from preceding page. pin no. pin name internal equivalent circuit 50 clk 51 52 53 cl dat ce 55 fss 57 58 refi vr 59 lf2 continued on next page. LA9240M no.5482 - 17/20
continued from preceding page. pin no. pin name internal equivalent circuit 41 60 61 rfsm ph1 bh1 62 ldd 63 lds LA9240M no.5482 - 18/20
sample application circuit LA9240M no.5482 - 19/20
no products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. anyone purchasing any products described or contained herein for an above-mentioned use shall: 1 accept full responsibility and indemnify and defend sanyo electric co., ltd., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: 2 not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on sanyo electric co., ltd., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. sanyo believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. this catalog provides information as of august, 1997. specifications and information herein are subject to change without notice. LA9240M no.5482 - 20/20

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