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?1 CXA2555Q e96730b76 rf amplifier for cd player/cd-rom description the CXA2555Q is an ic for rf signal processing of cd player and cd-rom. features wide-band rf ac amplifier (rf ac signal fc 3 20mhz) 4-mode rf equalizer (active filter type) rf equalizer boost amount and cut-off frequency adjustable efm time constant adjustable (switching function provided) peak hold time constant of mirror circuit adjustable tracking error amplifier cut-off frequency adjustable tracking error amplifier voltage gain adjustable center error amplifier apc (automatic power control) function apc on/off control supports laser coupler absolute maximum ratings supply voltage v cc 7v storage temperature tstg ?5 to +150 ? power consumption p d 800 mw operating conditions supply voltage v cc ?gnd 3.0 to 5.5 v operating temperature topr ?0 to +75 ? applications cd players cd-rom drives functions rf summing amplifier rf equalizer focus error amplifier tracking error amplifier center error amplifier mirror detection function apc circuit sony reserves the right to change products and specifications without prior notice. this information does not convey any license by any implication or otherwise under any patents or other right. application circuits shown, if any, are typical examples illustrating the operation of the devices. sony cannot assume responsibility for any problems arising out of the use of these circuits. 32 pin qfp (plastic)
?2 CXA2555Q ld rfo pd pd1 pd2 e f gnd te1 mode 1 mode 2 rfo 1 rfo 2 v cc mirr cp mirr t rfi sum out eq in rf c bst c fc c apc on ce in ce1 ce te c te fe b fe vc vca vc vc gnd apc on 56k 10k 1.25v 10k 10k 55k 56k 1k 20k 20k 10k 16k 16k 87k vc 164k 174k 27p vca vc 10k 20k 20k vc 23k vc 73.34k 320k 2p 9 10 11 12 13 14 15 2 3 4 5 6 7 8 1 hpf boost lpf delay vca control boost control filter control 25 26 27 28 29 30 31 32 mixer lpf vca mode sw v cc 17 18 19 20 21 22 23 24 16 vc v cc vs 40k 20k 20k vc 40k 1.25v 40k 40k open only for l/l mode vc hold peak /bot 80k 20k 51k 22k 80k 80k 1.3v 80k v cc vc 44p 10p 39k 18k vc vs 44k 27p 1.0v v cc block diagram
?3 CXA2555Q pin description pin no. 1 ld apc amplifier output. apc amplifier input. input of rf summing amplifier and focus error amplifier. ground. tracking error amplifier input for pins 5 and 6; tracking error amplifier output for pin 8; tracking error amplifier low- frequency gain setting for pin 12; tracking error amplifier output for pin 13. o i i i i i o i o pd pd1 pd2 gnd e f te1 te c te 2 3 4 7 5 6 8 12 13 symbol i/o equivalent circuit description 1 10k 1k 8k 55k 10k 2 3 4 147 20k 20k 147 16k 16k 164k 174k 10k 147 5 6 36.7k 147 8 12 147 147 vca 13 160k 147
?4 CXA2555Q 14 15 fe b fe focus bias adjustment for pin 14; focus error amplifier output for pin 15. o o 14 15 147 147 174k 164k 16 vc (vcc + gnd)/2 dc voltage output. o 16 120 120 17 mirr t peak hold time constant adjustment. i 17 147 10k 120k 80k 10k v cc pin no. symbol i/o equivalent circuit description 9 10 11 ce in ce1 ce center error amplifier input for pin 9; inverting amplifier output for pin 10; non-inverting amplifier output for pin 11. i o o 147 20k 147 20k 147 9 10 11
?5 CXA2555Q 18 cp connects a mirror hold capacitor. non-inverted input of mirror comparator. i 18 80k 1.5k 147 19 mirr mirror comparator output. o 19 20k 40k 100k 147 21 22 rfo 2 rfo 1 buffer switch output for the rf time constant setting for pin 21. on when pins 23 and 24 are connected to gnd. eq signal output for pin 22. o o 20 v cc power supply. 23 mode 2 i 24 mode 1 i 25 apc on i 21 22 147 147 3k 23 147 40k 10k 24 147 10k 40k 25 100k 147 1 n 1.5n 2.0n gnd v cc gnd v cc gnd gnd v cc v cc mode 1 mode 2 double-speed mode switching input. n is varied according to the external resistor connected to pin 26. switching pin for apc amplifier on/off. off when connected to vcc; on when connected to gnd. pin no. symbol i/o equivalent circuit description
?6 CXA2555Q 27 bst c sets the high-frequency boost amount of rf equalizer. i 27 5k 28 rf c sets the low-frequency gain of rf amplifier and rf equalizer. i 10k 147 28 29 eq in rf equalizer input. i 29 430 2k 147 10k 30 sum out rf summing amplifier output inversion. o 30 20k 20k 10k 147 pin no. symbol i/o equivalent circuit description 26 fc c i 147 5k 5k 5k 26 input to set the rf equalizer lpf cut-off frequency.
?7 CXA2555Q 31 rfi mirror circuit input. the rf summing amplifier output is input. i 31 147 18k 39k 44k 32 rfo rf signal output. eye pattern check point. o 32 147 15k 15k pin no. symbol i/o equivalent circuit description
?8 CXA2555Q dc current measurement dc current measurement dc current measurement v1 = 100mvp-p f = 100khz v1 = 100mvp-p, f = 100khz difference for g1-1 v1 = 100mvp-p, f = 100khz difference for g1-1 v1 = 100mvp-p, f = 10mhz difference for g1-1 dc voltage measurement dc voltage measurement dc voltage measurement v1 = 100mvp-p f = 1khz v1 = 100mvp-p f = 1khz g2-1 ?g2-2 v1 = 100mvp-p, f = 20khz difference for g2-1 v1 = 100mvp-p, f = 20khz difference for g2-2 dc voltage measurement dc voltage measurement 18.5 ?3.5 ?5 16 ?1.5 4.5 ? 1.75 ?0 17.5 17.5 ?.5 ? ? 1.9 30 ?0 140 19 ? 8 2.25 ?.6 0 20.5 20.5 0 2.4 ?.3 43.5 ?8.5 275 22 ?.5 11.5 ?.95 60 23.5 23.5 2.5 ?.7 ma ma mv db db db db v v mv db db db db db v v no. measurement item symbol sw conditions bias conditions s1 s2 s3 s4 s5 s6 s7 s8 s9 s10 s11 s12 s13 e1 e2 e3 measure- ment point description of output waveform and measurement method min. typ. max. unit 1 2 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 current consumption current consumption offset voltage voltage gain vca gain 1 vca gain 2 frequency response maximum output amplitude h maximum output amplitude l offset voltage voltage gain 1 voltage gain 2 voltage gain difference frequency response 1 frequency response 2 maximum output amplitude h maximum output amplitude l i cc i ee v1-1 g1-1 g1-2 g1-3 f1-1 v1-2 v1-3 v2-1 g2-1 g2-2 g2-3 f2-1 f2-2 v2-2 v2-3 o o o o o o o o o o o o o o o o o o b b c a b 0v 300mv ?00mv 0v 300mv 300mv 0.3v 0v 20 7 32 32 32 32 32 32 32 15 15 15 15 15 15 15 15 rf dc amplifier fe amplifier electrical characteristics (ta = 25?, v cc = 2.5v, gnd = vc, v ee = ?.5v)
?9 CXA2555Q dc voltage measurement v1 = 100mvp-p f = 1khz v1 = 100mvp-p f = 1khz g3-1 ?g3-2 v1 = 100mvp-p, f = 1khz v1 = 100mvp-p, f = 1khz v1 = 100mvp-p, f = 20khz difference for g3-1 v1 = 100mvp-p, f = 20khz difference for g3-2 v1 = 100mvp-p, f = 180khz difference for g3-1 v1 = 100mvp-p, f = 180khz difference for g3-2 dc voltage measurement dc voltage measurement dc voltage measurement v1 = 100mvp-p, f = 1khz difference for g2-1 v1 = 100mvp-p, f = 20khz difference for g3-1 dc voltage measurement dc voltage measurement ?0 17.9 17.9 ?.0 11.9 23.9 ? ? ? ? 1.9 ?0 17 ? 0.85 30 20.9 20.9 0 14.9 26.9 2.4 ?.2 65 20 1.7 ?.1 150 23.9 23.9 2.0 17.9 29.9 ?.7 200 23 ?.85 mv db db db db db db db db db v v mv db db v v s1 s2 s3 s4 s5 s6 s7 s8 s9 s10 s11 s12 s13 e1 e2 e3 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 offset voltage voltage gain 1 voltage gain 2 voltage gain difference vca gain 1 vca gain 2 frequency response 1 frequency response 2 frequency response 3 frequency response 4 maximum output amplitude h maximum output amplitude l offset voltage voltage gain 1 frequency response 1 maximum output amplitude h maximum output amplitude l v3-1 g3-1 g3-2 g3-3 g3-4 g3-5 f3-1 f3-2 f3-3 f3-4 v3-2 v3-3 v4-1 g4-1 f4-1 v4-2 v4-3 o o o o o o o o o o o o o o b c a b b o o o o 0v 300mv 300mv 0v 300mv 300mv 0.3v 0v 13 13 13 13 13 13 13 13 13 13 13 13 11 11 11 11 11 te amplifier ce amplifier no. measurement item symbol sw conditions bias conditions measure- ment point description of output waveform and measurement method min. typ. max. unit
?10 CXA2555Q v1 = 25mvp-p, f = 100khz v1 = 25mvp-p, f = 100khz difference for g5-1 v1 = 100mvp-p, f = 2mhz difference for g5-1 v1 = 25mvp-p, f = 1mhz difference for g1-1 v1 = 25mvp-p, f = 10mhz difference for g1-1 v1 = 25mvp-p, f = 15mhz difference for g1-1 v1 = 25mvp-p, f = 20mhz difference for g1-1 v5-3 ?v5-1 v5-1 ?v5-4 hpf = 400hz, lpf = 3mhz v1 = 0.8vp-p, f = 10khz v1 = 0.8vp-p, f = 10khz v1 = 0.8vp-p, 55% am mod. v1 = 800mvp-p v1 = 800mvp-p v1 = 800mvp-p f (v1) = 10khz f (v1) = 10khz 0.25 0.25 17 4.5 1.5 ? ? ? ? 0.45 0.45 1.8 40 250 0.35 0.75 0.8 22.5 8 4 0.85 0.9 400 550 1.15 1.15 26.5 10.5 6.5 6 ?.2 600 900 1.8 v v db db db db db db db v v mv v v hz hz khz khz vp-p vp-p s1 s2 s3 s4 s5 s6 s7 s8 s9 s10 s11 s12 s13 e1 e2 e3 37 38 39 40 41 42 43 44 45 46 47 48 50 51 52 53 54 55 56 57 offset voltage offset voltage voltage gain 1 vca gain 1 boost gain frequency response 1 frequency response 2 frequency response 3 frequency response 4 maximum output amplitude h maximum output amplitude l output noise high level output voltage low level output voltage mirror hold frequency response bottom hold frequency response maximum operating frequency 1 maximum operating frequency 2 minimum input voltage maximum input voltage v5-1 v5-2 g5-1 g5-2 g5-3 f5-1 f5-2 f5-3 f5-4 v5-3 v5-4 vn v6-1 v6-2 f6-1 f6-2 f6-3 f6-4 v6-3 v6-4 o o o o o o o o o o o o o o o o o o b o o o o b a b o o o o o o o o o o o o o o 0v 300mv ?00mv 0v ?00mv ?00mv ?00mv ?00mv ?00mv ?00mv ?00mv ?00mv 0.3v 0v 1.0v 0v 22 21 22 22 22 22 22 22 22 22 22 22 19 19 19 19 19 19 19 19 rfac amplifier (rf equalizer + sum amplifier) mirr no. measurement item symbol sw conditions bias conditions measure- ment point description of output waveform and measurement method min. typ. max. unit
?11 CXA2555Q dc voltage measurement dc voltage measurement dc voltage measurement dc voltage measurement i1 = 0.8madc dc voltage measurement dc voltage measurement ?.2 0.3 1.8 ?.1 ?.6 ?.35 1.6 2.4 ?.9 0 ?.9 1.4 0 0.1 v v v v v v s1 s2 s3 s4 s5 s6 s7 s8 s9 s10 s11 s12 s13 e1 e2 e3 58 59 60 61 62 63 output voltage 1 output voltage 2 output voltage 3 output voltage 4 output voltage 5 output voltage v7-1 v7-2 v7-3 v7-4 v7-5 vc b b o 0v 69mv 123mv 177mv 0v 0v 0.3v 0v 1 1 1 1 1 16 apc vc no. measurement item symbol sw conditions bias conditions measure- ment point description of output waveform and measurement method min. typ. max. unit
?12 CXA2555Q electrical characteristics measurement circuit 20k v cc 10k 10k 10k 10k 20k v ee s6 ac b v ee 33 33 e3 0.033 v cc 10k 1 10k 1 v ee v cc s11 v cc s12 v ee v cc s13 v ee 20k v cc s7 v cc s8 5.1k 5.1k 2k 20k 20k s9 ac b 10k v cc v ee e2 i1 44k 44k 112k s3 s4 v ee 112k s1 s2 s5 100k 10k v1 e1 s10 ld rfo pd pd1 pd2 e f gnd te1 mode 1 mode 2 rfo 1 rfo 2 v cc mirr cp mirr t rfi sum out eq in rf c bst c fc c apc on ce in ce1 ce te c te fe b fe vc 9 10 11 12 13 14 15 2 3 4 5 6 7 8 1 25 26 27 28 29 30 31 32 17 18 19 20 21 22 23 24 16
?13 CXA2555Q application circuit focus error out 10k mirror out 0.1 v cc 4700p 1000p 0.1 47k 120k vc 33 0.1 rf ac out mode 2 in mode 1 in 6.8k 3.9k ld on 0.1 vc 10k 47k tracking error out center error out al in 0.1 33 f in 47k 62k e in 100k pd2 in pd1 in 100 500 1/6.3v 10h 10 v cc gnd 100/6.3v ld rfo pd pd1 pd2 e f gnd te1 mode 1 mode 2 rfo 1 rfo 2 v cc mirr cp mirr t rfi sum out eq in rf c bst c fc c apc on ce in ce1 ce te c te fe b fe vc 9 10 11 12 13 14 15 2 3 4 5 6 7 8 1 25 26 27 28 29 30 31 32 17 18 19 20 21 22 23 24 16 vc vc vc vc 3p * application circuits shown are typical examples illustrating the operation of the devices. sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same.
?14 CXA2555Q description of functions rf block the rf signal processing is performed by this circuit. the output is separated to ac and dc. the ac is the capacitance-coupled input via the equalizer circuit and used for the efm demodulation signal processing. the dc contains the dc component and is used for the mirror, defect and fok signal processings. the vca function is provided for both the ac and dc signal processing systems. pin 28 is the control voltage input pin. (see the characteristics graphs on page 19 and page 20 for the gain and control voltage.) rf equalizer block diagram is as shown below: lpf1 delay eq in mixer fc c hpf boost fc c bst c lpf2 fc c lpf3 fc c lpf4 fc c vca rf c eq out the equalizer function is provided for the ac signal processing system for the efm signal demodulation. the each filter is constructed in the bessel type which has the little group delay difference. the boost frequency and boost amount can be set by the external resistors connected to pins 26 and 27. (see the characteristics graphs on page 19 for the boost frequency and boost amount.) the transmittance for each filter is as follows: hpf: (ks 2 ) / (s 2 + 3.22597s + 2.94933) lpf1: (2.94933 ) / (s 2 + 3.22597s + 2.94933) lpf2: (3.32507 ) / (s 2 + 2.75939s + 3.32507) lpf3: (4.20534 ) / (s 2 + 1.82061s + 4.20534) lpf4: (1.68536 ) / (s + 1.68536)
?15 CXA2555Q rf dc amplifier the signal currents from the photodiodes a, b, c and d are i-v converted and input to pins 3 and 4 as pd1 = a + c, pd2 = b + d. these signals are added by the rf summing amplifier, inverted by the rf drive amplifier and output to pin 32. the vca control voltage on pin 28 is used for the gain adjustment. 3 4 30 32 vca 28 10k 20k 20k vc rf summing amp pd2 pd1 sum out rfo i-v i-v rf c 47k vc the low frequency component of the rfo output voltage is as follows: v rfo = 4.9 (pd1 + pd2) (rfc voltage = 1/2 vc) focus error amplifier the operation of pd2-pd1 is performed and the resulting signal is output to pin 15. 14 15 3 4 16k 16k pd2 pd1 i-v i-v vc focus error amp 174k 87k 164k 27p fe 27p fe b 47k the low frequency component of the fe output voltage is as follows: v fe = (pd2 ?pd1) = 10.9 (pd2 ?pd1) 174k 16k
?16 CXA2555Q tracking error amplifier the signal current from the photodiode f is i-v converted and input to pin 6 via the input resistor. the signal current from the photodiode e is i-v converted and input to pin 5 after its gain is adjusted by the volume. these signals undergo operational amplification at the tracking error amplifier, vca and tracking drive amplifier and they are output to pin 13. 5 6 8 12 13 vca 320k 73.4k vc i-v e te 112k vc 62k i-v 100k 44k f te1 2p 14p te c 47k vc the low frequency component of the te output voltage is as follows: v te = (f ?e) = 11.1 (f ?e) (tec voltage = 1/2 vc) center error amplifier the input signal is operational amplified by the center error amplifier and center drive amplifier after passing via the input resistor and then it is output to pin 11. 112k 44k 320k 73.4k 23k 100k ce ce in 9 10 11 vc 10k vin ce1 20k 20k 10k the low frequency component of the ce output voltage is as follows: v ce = vin = 10 vin 100k 10k 20k 20k
?17 CXA2555Q mirror circuit the mirror circuit performs peak and bottom hold after rfi signal has been amplified. the peak hold is executed with the time constant which follows the traverse signal of 100khz for l/l mode (both of pins 23 and 24 are connected to gnd) and maximum 600khz (adjustable with the dc voltage on pin 17) for l/h, h/l, h/h modes. the bottom hold is executed with the time constant which follows the rotation cycle envelope fluctuation. rfo 17 18 19 31 peak & bottom hold 18k vc mirr amp rfi 44k cp mirr t mirr 3.125v 39k vc vc h i open only for l/l mode mirr dif amp 80k 80k 80k 80k 1.3v 20k vc j k 0.33 mirr hold amp mirr comparator g vcc 22k 51k 44p 10p 1.0v aaaaaa aaaaaa aaaaaa 0v aaa aaa aaa aa aa aa rfo 0v 0v 0v h l aaaaaa aaaaaa aaaaaa aaa aaa aaa aa aa g (rfi) h (peak hold) i (bottom hold) j k (mirror hold) mirr the mirror signal is output by comparing to the signal k (2/3 level of the j peak value which is peak-held with a large time constant) where the difference of hold signals h and i is obtained. the mirror output is low for tracks on the disc and high for the area between tracks (the mirror areas). in addition, a high signal is output when a defect is detected. the mirror hold time constant must be sufficiently large in comparison with the traverse signal.
?18 CXA2555Q center voltage generation circuit the center voltage of vr = (vcc + gnd)/2 is supplied. the maximum current is approximately 3ma 25 vc 16 v cc v cc 40k 40k vc buffer vr apc circuit when the laser diode is driven by a constant current, the optical power output has extremely large negative temperature characteristics. the apc circuit is used to maintain the optical power output at a constant level. the laser diode current is controlled according to the monitor photodiode output. apc is on by connecting apc_on pin to gnd; it is off by connecting the pin to vcc. pd ld 10k 1.25v 1 56k 8k 10k 10k 56k v cc 55k 1k 10 100 100 10 1 500 2
?19 CXA2555Q 20 l/l h/l l/h h/h 22 24 26 28 10 ? 10 0 10 1 frequency [mhz] gain [db] ? 1 3 5 8 0 rbst [k w ] boost [db] boost gain characteristics 5 101520 0 2 4 6 7 5 10 25 4 rfc [k w ] fc [mhz] cut-off frequency 8 121620 15 20 6 101418 10 15 35 0.8 rf c [v] gv [db] vca characteristics 1.0 1.4 1.8 20 25 1.2 1.6 30 rf ac characteristics graphs (pin 22) frequency response 1 2 rf c = vc rbst = 3.9k w rfc = 6.8k w rfc =6.8k w , rf c = vc 1 2 rbst = 0 w , rf c = vc h/h mode 1 2 notes) in the graphs above, rfc: fc c (pin 26) external resistor value rbst: bst c (pin 27) external resistor value * to ensure stable operation, it is recommended to select rfc value of 6.2k and above, and rbst of 10k and below in all cases.
?20 CXA2555Q 10 15 20 25 10 ? 10 0 10 1 frequency [mhz] gain [db] frequency response rf dc characteristics graphs (pin 32) 10 14 30 0.8 rf c [v] gv [db] vca characteristics 1.0 1.4 1.8 18 22 1.2 1.6 26 12 16 20 24 28 28 10 14 30 0.4 te c [v] gv [db] vca characteristics 1.0 1.4 2.0 18 22 1.2 1.6 26 12 16 20 24 1.8 0.6 0.8 te characteristics graphs (pin 13) 10 15 20 25 10 0 10 1 10 3 frequency [khz] gain [db] frequency response 10 2 h/l, l/h, h/h l/l 10 15 20 25 10 0 10 1 10 3 frequency [khz] gain [db] 10 2 fe frequency response (pin 15) frequency response 10 15 20 25 10 0 10 1 10 3 frequency [khz] gain [db] 10 2 ce frequency response (pin 11) frequency response te c = vc 1 2 rf c = vc 1 2
?21 CXA2555Q 100 300 500 600 1.8 2.4 mirr t [v] fmax [khz] maximum operating frequency vs. mirr t pin voltage mirror characteristics graph (pin 19) 150 200 250 350 400 450 550 2.0 2.2 2.6 2.8 3.0 3.2 3.4 3.6 0.5 2.0 3.5 5.0 80 120 200 pd [mv] ld [v] ld voltage vs. pd voltage apc characteristics graph (pin 1) 160 100 140 180 1.0 2.5 4.0 1.5 3.0 4.5 vin = ?.4v dc , 800mvp-p h/l, l/h, or h/h mode
?22 CXA2555Q package outline unit: mm sony code eiaj code jedec code package material lead treatment lead material package weight epoxy resin solder plating 42 alloy 32pin qfp (plastic) 9.0 0.2 7.0 ?0.1 1.5 ?0.15 (8.0) 0.1 ?0.1 + 0.2 + 0.35 + 0.3 0.50 0.127 ?0.05 + 0.1 0?to 10 0.8 0.3 ?0.1 + 0.15 1 8 9 32 16 17 24 25 m 0.12 0.1 0.2g qfp-32p-l01 * qfp032-p-0707-a

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