View CXA3031Q_5074079.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

?1 CXA3031Q e95318-st read/write amplifier (with built-in filters) for fdds description the CXA3031Q is a monolithic ic designed for use with three-mode floppy disk drives, and contains a read circuit (with a four-mode filter system), a write circuit, an erase circuit, and a supply voltage detection circuit, all on a single chip. features single 5v power supply filter system can be switched among four modes: 1m, 1.6m/2m, which are each inner track/outer track filter characteristics can be set to chebyshev (1db ripple) for 1.6m, 2m/inner track only, and to butterworth for the other modes a custom selection can be made between chebyshev (1db ripple) and butterworth for the filter characteristics for 1.6m, 2m/inner track only permits customization of the fc ratio low preamplifier input conversion noise voltage of 2.0nv/ hz (typ.) keeps read data output jitter to a minimum preamplifier voltage gain can be switched between 39db and 45db in inner track mode (otf = low), the voltage gain is boosted by 3db, making it possible to minimize peak shift in inner tracks. time domain filter can be switched between two modes: 1m, 1.6m/2m write current can be switched among three modes: 1m/1.6m/2m. the inner/outer track current ratio is fixed for each mode, but can be customized. erase current can be set by an external resistor, and remains constant. in addition, the current rise time tr and fall time tf are determined according to the head inductance and current. (refer to page 20.) damping resistor can be built in. resistance can be customized between 2k and 15k in 1k steps. a damping resistor can not be connected to this ic, however. supply voltage detection circuit applications three-mode fdds structure bipolar silicon monolithic ic absolute maximum ratings (ta = 25?) supply voltage v cc 7.0 v operating temperature topr ?0 to +75 ? storage temperature tstg ?5 to +150 ? allowable power dissipation p d 500 mw digital signal input pin input voltage ?.5 to v cc + 0.3 v power on output voltage applied v cc + 0.3 v erase output voltage applied v cc + 0.3 v write head voltage applied 15 v write current i w 20 mao-p erase current i e 30 ma power on output current 7 ma operating conditions supply voltage 4.4 to 6.0 v sony reserves the right to change products and specifications without prior notice. this information does not convey any licens e by any implication or otherwise under any patents or other right. application circuits shown, if any, are typical examples illustr ating 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 CXA3031Q block diagram and pin configuration x h d f i l t e r m m v a f c s e t a . g n d h e a d 0 a h e a d 0 b h e a d 1 b h e a d 1 a p r e o u t a x w d r d x w g x e g x s 1 x c i f i l t e r o u t a o u t b x p s e r a 1 e r a 0 d . g n d p o w e r o n w c l d w c m d i e s e t x h g p r e o u t b v c c n c o t f x 3 6 0 w c h d w r i t e d r i v e r e r a s e d r i v e r p o w e r m o n i t o r c o n t r o l l o g i c c o m p t i m e d o m a i n f i l t e r p r e a m p f i l t e r d i f f + l p f ( b p f ) 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 3 0 3 1 3 2 1
? 3 CXA3031Q pin description pin no. symbol pin voltage equivalent circuit description 1 power on reduced voltage detection output. this is an open collector pin that outputs a low signal when v cc is below the specified value. v c c a . g n d 1 0 0 k 1 2 xwd write data input. this pin is a schmitt-type input that is triggered when the logical voltage goes from high to low. v c c 1 k a . g n d 2 . 3 v 2 3 rd 4 xci 5 xwg 6 xeg 7 xs1 8 otf 9 xhd read data output. this pin is active when the logical voltage of the write gate signal and the erase gate signal is high. write current control. the write current increases when the logical voltage is low. write gate signal input. the write system becomes active when the logical voltage is low. erase gate signal input. the erase system becomes active when the logical voltage is low. head side switching signal input. the head1 system is active when the logical voltage is low, and the head0 system is active when the logical voltage is high, but only when the logical voltage for the write gate and the erase gate is high. filter inner track/outer track mode control. inner track mode is selected when the logical voltage is low. filter, time domain filter and write current 1m/2m mode control. 2m mode is selected when the logical voltage is low. 1 4 0 v c c d . g n d 3 v c c 1 0 0 k 1 k a . g n d 2 . 1 v 4 5 6 7 8 9
? 4 CXA3031Q pin no. symbol pin voltage equivalent circuit description 18 x360 filter, time domain filter and write current 1m/1.6m mode control. 1.6m mode is selected when the logical voltage is low. 1 8 2 0 v c c 1 0 0 k 1 k a . g n d 2 . 1 v v c c a . g n d 1 . 2 v 1 1 1 k 1 4 7 1 4 7 v c c a . g n d 1 . 2 v 1 2 1 4 0 v c c a . g n d 3 0 0 1 4 0 3 0 0 1 4 1 5 1 4 0 v c c a . g n d 2 0 0 1 4 0 2 0 0 1 7 1 9 20 xhg preamplifier voltage gain selection. gain is boosted by 6db when the logical voltage is low compared to when the logical voltage is high. 10 v cc power supply (5v) connection. 11 fcset 3.8v filter cutoff frequency setting resistor connection. connect the filter cutoff frequency setting resistor r f between this pin and v cc in order to set the cutoff frequency. 12 mmva 0.5v time domain filter 1st monostable multivibrator pulse width setting. connect the 1st monostable multivibrator pulse width setting resistor r a between this pin and a.gnd. 13 a.gnd analog system gnd connection. 14 filter outb 3.4v 15 filter outa 3.4v 17 pre outb 3.4v filter differential outputs. 19 pre outa 3.4v preamplifier differential outputs. 16 (nc) not connected.
? 5 CXA3031Q pin no. symbol pin voltage equivalent circuit description 21 head 1b 22 head 1a 23 head 0b 24 head 0a 25 wcld 26 wcmd 27 wchd 5v when xwg = high 3.8v when xwg = low 28 ieset 29 d.gnd 30 era0 31 era1 magnetic head input/output connections. connect the recording/playback magnetic head to these pins, and connect the center tap to v cc . when the logical voltage for pin 7 (xs1) is low, the head1 system is active; when the logical voltage is high, the head0 system is active. 1m write current setting resistor connection. connect the write current setting resistor r wld between this pin and v cc to set the write current. 1.6m write current setting resistor connection. connect the write current setting resistor r wmd between this pin and v cc to set the write current. 2m write current setting resistor connection. connect the write current setting resistor r whd between this pin and v cc to set the write current. erase current setting resistor connection. connect the erase current setting resistor r e between this pin and v cc to set the erase current. digital system gnd connection. erase current connection for the head0 system. erase current connection for the head1 system. a . g n d 2 1 2 2 2 3 2 4 v c c a . g n d 1 . 2 v 1 4 7 1 4 7 1 4 7 2 5 2 6 2 7 v c c a . g n d 1 . 2 v 1 4 7 2 8 v c c a . g n d 3 0 3 1 5v when xeg = high 3.8v when xeg = low
? 6 CXA3031Q pin no. symbol pin voltage equivalent circuit description 32 xps power saving signal input. when the logical voltage is low, the ic is in power saving mode. in power saving mode, only the power supply on/off detector operates. v c c 1 6 2 k 1 k a . g n d 2 . 1 v 3 2
? 7 CXA3031Q electrical characteristics current consumption (ta = 25 c, v cc = 5v) item symbol conditions min. typ. max. unit current consumption in read mode current consumption in write/erase mode current consumption in power saving mode iccr iccwe iccps xwg = high xwg = low, xeg = low xps = low 16 7 26 13 0.95 36 19 1.9 ma ma ma power supply monitoring system (ta = 25 c) item symbol conditions min. typ. max. unit power supply on/off detector threshold voltage power on output saturation voltage vth vsp v cc = 3.5v i = 1ma 3.5 3.9 4.3 0.5 v v read system (ta = 25 c, v cc = 5v) item symbol conditions measure- ment circuit measure- ment point min. typ. max. unit preamplifier voltage gain low gain/outer track preamplifier voltage gain low gain/inner track preamplifier voltage gain high gain/outer track preamplifier voltage gain high gain/inner track preamplifier frequency response preamplifier input conversion noise voltage preamplifier differential output offset voltage filter differential output offset voltage filter differential output voltage amplitude gvlo gvli gvho gvhi bw en vofsp vofsf vof f = 100khz otf = high, xhg = high f = 100khz otf = low, xhg = high f = 100khz otf = high, xhg = low f = 100khz otf = low, xhg = low g v /g v (100khz) = ?db band width = 400hz to 1mhz, v i = 0 v i = 0 v i = 0 1 1 1 1 1 1 1 1 1 d, e d, e d, e d, e d, e d, e d, e b, c b, c 37.1 40.1 43.1 46.1 5 ?00 ?00 2.8 39.0 42.0 45.0 48.0 2.0 40.6 43.6 46.6 49.6 2.9 +500 +100 db db db db mhz nv/ hz mv mv vp-p measure- ment circuit measure- ment point measure- ment circuit measure- ment point
? 8 CXA3031Q read system (ta = 25 c, v cc = 5v) time domain filter monostable multivibrator pulse width read data pulse width read data output low output voltage read data output high output voltage read data output * 1 rise time read data output * 1 fall time peak shift * 2 t1 t2 vol voh t r t f ps x360 = x, xhd = high (1m mode) x360 = low, xhd = low (1.6m mode) or x360 = high, xhd = low (2m mode) refer to fig. 1 refer to fig. 1 i ol = 2ma i oh = ?.4ma r l = 2k c l = 20pf r l = 2k c l = 20pf v i = 0.25mvp-p to 3.5mvp-p xhg = low, xhd = low otf = low, x360 = high f = 125khz, 2m/ inner track mode refer to fig. 1 1 1 1 1 1 1 1 1 a, f a, f a a a a a a 2.25 1.13 260 2.8 2.5 1.25 400 2.75 1.38 540 0.5 100 100 1 s s ns v v ns ns % * 1 read data output: 0.5v to 2.4v * 2 signal input level low gain/outer track: v i = 0.5mvp-p to 10mvp-p low gain/inner track: v i = 0.5mvp-p to 7mvp-p high gain/outer track: v i = 0.25mvp-p to 5mvp-p high gain/inner track: v i = 0.25mvp-p to 3.5mvp-p item symbol conditions min. typ. max. unit measure- ment circuit measure- ment point
? 9 CXA3031Q fig. 1 1st and 2nd monostable multivibrator pulse width precision and peak shift measurement conditions 1st monostable multivibrator pulse width precision when x360 = x and xhd = high: etm1 = ( ?1) 100 [%] when x360 = low and xhd = low, or x360 = high and xhd = low: etm1' = ( ?1) 100 [%] 1st monostable multivibrator pulse width = t 2 peak shift ps = 100 [%] t 1 2.5 s 1 2 t a ?t b t a + t b t 1 1.25 s e x t e r n a l c o m p a r a t o r o u t p u t ( m e a s u r e m e n t p o i n t f ) t 1 t 2 t a t b 1 . 4 v r e a d d a t a o u t p u t ( m e a s u r e m e n t p o i n t a )
? 10 CXA3031Q read system (filters) (ta = 25 c, v cc = 5v) peak frequency peak voltage gain * 3 frequency response (1) frequency response (2) peak frequency peak voltage gain * 3 frequency response (1) frequency response (2) peak frequency peak voltage gain * 3 frequency response (1) frequency response (2) fo 1 gp 1 g 11 g 12 fo 2 gp 2 g 21 g 22 fo 3 gp 3 g 31 g 32 1m outer track 1m inner track 1.6m/ 2m outer track x360 = x xhd = high otf = high refer to fig. 2 at f 01 refer to fig. 2 at 1/3f 01 refer to fig. 2 at 3f 01 x360 = x xhd = high otf = low refer to fig. 2 at f 02 refer to fig. 2 at 1/3f 02 refer to fig. 2 at 3f 02 x360 = low xhd = low otf = high (1.6m/outer track) or x360 = high xhd = low otf = high (2m/outer track) refer to fig. 2 at f 03 refer to fig. 2 at 1/3f 03 refer to fig. 2 at 3f 03 1 1 1 1 1 1 1 1 1 1 1 1 b, c d, e b, c b, c b, c b, c d, e b, c b, c b, c b, c d, e b, c b, c b, c 153.0 4.3 ?.6 ?4.7 163.8 4.3 ?.6 ?4.7 288.0 4.4 ?.6 ?5.0 170.0 6.2 ?.1 ?2.8 182.0 6.2 ?.1 ?2.8 320.0 6.3 ?.1 ?3.1 187.0 7.8 ?.6 ?1.2 200.2 7.8 ?.6 ?1.2 352.0 7.9 ?.6 ?1.5 khz db db db khz db db db khz db db db item symbol conditions min. typ. max. unit measure- ment circuit measure- ment point
? 11 CXA3031Q peak frequency peak voltage gain * 3 frequency response (1) frequency response (2) fo 4 gp 4 g 41 g 42 1.6m/ 2m inner track x360 = low xhd = low otf = low (1.6m/inner track) or x360 = high xhd = low otf = low (2m/inner track) refer to fig. 2 at f 04 refer to fig. 2 at 1/3f 04 refer to fig. 2 at 3f 04 1 1 1 1 b, c d, e b, c b, c b, c 310.5 5.9 ?.5 ?6.9 345.0 7.8 ?.0 ?5.0 379.5 9.4 ?.5 ?3.4 khz db db db * 3 gpn = 20 log10 (vfilterout/vpreout) vfilterout = filter differential output voltage (n = 1 to 4) g n 1 g n 2 f [ h z ] 3 f o n f o n 1 / 3 f o n [ d b ] g p n ( n = 1 t o 4 ) fig. 2. filter frequency response measurement conditions item symbol conditions min. typ. max. unit measure- ment circuit measure- ment point
? 12 CXA3031Q write/erase system (ta = 25 c, v cc = 5v) write current output precision * 4 write current output unbalance head i/o pin leak current for writes write head pin current at saturation erase current output precision * 5 erase current output pin leak current erase current rise time * 6 erase current fall time * 6 ew dw ilkw isw ee ilke tre tfe xwg = low rw = 1.3k xwg = low rw = 1.3k xwg = low xwg = low rw = 1.3k vsw = 1v sw1 = b xeg = low re = 1.3k xeg = low defined at 10% to 90% of i e defined at 90% to 10% of i e 2 2 2 2 2 2 2 2 j, k l, m j, k l, m j, k l, m j, k l, m n, o n, o n', o' n', o' ? ? 2.47 ?0 0.6 0.6 2.70 1.3 1.3 +7 +1 10 2.97 +10 10 2.1 2.1 % % a mao-p % a s s * 4 write current output precision e w = ( ?1) 100 [%] * 5 erase current output precision e e = ( ?1) 100 [%] * 6 erase current rise/fall times show the values when the output pin is shorted with the power supply. i w 2.72mao-p i e 9.08ma logic input block (ta = 25 c, v cc = 5v) digital signal input low input voltage digital signal input high input voltage schmitt-type digital signal input low input voltage schmitt-type digital signal input high input voltage digital signal input low input current digital signal input high input current vld vhd vlsd vhsd ild ihd vl = 0v vh = 5v 2 2 2 2 2 2 bcde fghip bcde fghip a a abcde fghip abcde fghip 2.0 2.0 ?0 0.8 0.8 10 v v v v a a item symbol conditions min. typ. max. unit measure- ment circuit measure- ment point item symbol conditions min. typ. max. unit measure- ment circuit measure- ment point
? 13 CXA3031Q electrical characteristics measurement circuit 1 x h d f i l t e r m m v a f c s e t a . g n d h e a d 0 a h e a d 0 b h e a d 1 b h e a d 1 a p r e o u t a x w d r d x w g x e g x s 1 x c i f i l t e r o u t a o u t b x p s e r a 1 e r a 0 d . g n d p o w e r o n w c l d w c m d i e s e t x h g p r e o u t b v c c n c o t f x 3 6 0 w c h d 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 3 0 3 1 3 2 1 c x a 3 0 3 1 q 1 . 3 k 1 . 3 k 1 . 3 k 1 . 3 k s w 1 s w 2 a b a b s w 3 a b 5 v 3 . 2 6 k 2 7 k s w 4 a b s w 5 a b b a 1 / 2 v i 1 / 2 v i b a s w 6 a c b e d 1 2 k 3 3 0 0 p 3 3 0 0 p f * 7 e x t e r n a l c o m p a r a t o r note) unless otherwise specified, switches are assumed to be set to ?? * 7 cr time constant of external comparator input stage is equivalent to the time constant of comparater with a built-in ic.
? 14 CXA3031Q electrical characteristics measurement circuit 2 x h d f i l t e r m m v a f c s e t a . g n d h e a d 0 a h e a d 0 b h e a d 1 b h e a d 1 a p r e o u t a x w d r d x w g x e g x s 1 x c i f i l t e r o u t a o u t b x p s e r a 1 e r a 0 d . g n d p o w e r o n w c l d w c m d i e s e t x h g p r e o u t b v c c n c o t f x 3 6 0 w c h d 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 3 0 3 1 3 2 1 c x a 3 0 3 1 q 1 . 3 k 1 . 3 k 1 . 3 k 1 . 3 k 5 v 3 . 2 6 k 2 7 k s w 1 a b v s w b a s w 2 a g i h b c d e f p m m ' b a l l ' b a k k ' b a j j ' a b a b s w 3 2 0 0 2 0 0 n n ' o o ' note) unless otherwise specified, switches are assumed to be set to "a".
? 15 CXA3031Q description of operation (1) read system preamplifier the preamplifier amplifies input signals. the voltage gain can be switched between 39db and 45db, using pin 20. in addition, an additional 3db boost in the voltage gain is possible by setting pin 8 low. filters the filters differentiate the signals amplified by the preamplifier. the high-band noise components are attenuated by the low-pass filter. the filters can be switched among four modes, depending on the settings of pins 8, 9 and 18. in 1m/outer track mode, the peak frequency f o1 is set by external resistor r f . f o for the other three modes is switched by the internal settings of the ic, with f o1 used as a reference (1.00). a c t i v e f i l t e r b l o c k b p f l p f h p f p r e a m p l i f i e r o u t p u t a p r e a m p l i f i e r o u t p u t f i l t e r o u t p u t a f i l t e r o u t p u t b s e c o n d a r y f o b = 1 . 2 f c q = 0 . 5 7 7 t e r t i a r y f c : v a r i a b l e p r i m a r y f c h = 5 k h z g a i n : 8 d b p r e a m p l i f i e r o u t p u t b a m p 1 9 1 7 1 5 1 4 the center frequency f ob of the bpf is fixed to 1.2 times the cutoff frequency f o of the lpf. the lpf characteristics are set to chebyshev (1db ripple) for 1.6m, 2m/inner track mode only, and to butterworth for all other modes. pin8 otf pin9 xhd pin18 x360 lpf characteristics fo ratio h l h l h l h h l l l l x x l l h h 1m/outer track: butterworth 1m/inner track: butterworth 1.6m/outer track: butterworth 1.6m/inner track: chebyshev 1db ripple 2m/outer track: butterworth 2m/inner track: chebyshev 1db ripple 1.00 1.07 1.88 2.03 1.88 2.03 the formula for determining the peak frequency f o1 for 1m/outer track mode is shown below: fo 1 = 534/r f + 6.2 [khz] r f : filter setting resistance [k ]
? 16 CXA3031Q comparator the comparator detects the crosspoint of the filter differential output. time domain filter the time domain filter converts the comparator output to read data. this filter is equipped with two monostable multivibrators. 1st monostable multivibrator eliminates unnecessary pulses, and 2nd monostable multivibrator determines the pulse width of the read data. the 1st monostable multivibrator pulse width t1 is determined by the resistor ra between pin 12 and a.gnd. t1 can be switched as follows by the settings of pins 9 and 18: when xhd = high and x360 = x t1(1m) = 88ra + 124 [ns] ra [k ] when xhd = low and x360 = low or xhd = low and x360 = high t1(1.6m/2m) = 44ra + 62 [ns] the pulse width for 2nd monostable multivibrator is fixed at 400ns. (2) write system write data input through pin 2 is frequency-divided by the t flip-flop and generates the recording current for the head. the recording current can be switched by the settings of pins 9 and 18. the write current i w is set by the resistors r w connected between pin 25 and v cc , between pin 26 and v cc , and between pin 27 and v cc . i w = 3.53/r w [ma o-p ] r w [k ] furthermore, the inner/outer track write current i w can be changed for each mode by switching pin 4. however, the current ratio between the inner and outer tracks is fixed. (3) erase current the erase current i e is set by the resistor r e between pin 28 and v cc . i e = 11.8/r e [ma] r e [k ] pins 30 and 31 are constant current outputs. in addition, in order to minimize the r/w head crosstalk time constants are provided for the rise and fall of the erase current. for details, refer to page 20 and page 21. (4) power on/off detection system the power on/off detection system detects a reduced voltage in the supply voltage. when v cc is below the specified value, the write system and erase system cease operation, disabling the write and erase functions. notes on operation select the voltage gain so that the preamplifier output amplitude is 1vp-p or less. if the preamplifier output amplitude exceeds 1vp-p, the filter output waveform becomes distorted. observe the following point when mounting this device. the ground should be as large as possible.
? 17 CXA3031Q application circuit x h d f i l t e r m m v a f c s e t a . g n d h e a d 0 a h e a d 0 b h e a d 1 b h e a d 1 a p r e o u t a f i l t e r o u t a o u t b x p s e r a 1 e r a 0 d . g n d w c l d w c m d i e s e t x h g p r e o u t b v c c n c x w d r d x w g x e g x s 1 x c i p o w e r o n o t f x 3 6 0 w c h d w r i t e d r i v e r e r a s e d r i v e r p o w e r m o n i t o r c o n t r o l l o g i c c o m p t i m e d o m a i n f i l t e r p r e a m p f i l t e r d i f f + l p f ( b p f ) 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 3 0 3 1 3 2 1 1 5 v c c r a r f r w l d r w m d r w h d r e notes 1. if a resistor for setting the write current is not used, connect that pin to v cc . however, if connected to v cc , do not select that mode for writes, as doing so could cause a large current flow that could damage the ic. 2. when using two modes (1m and 2m), connect x360 (pin 18) to v cc and set xhd (pin 9) high or low to switch modes. application circuits shown are typical examples illustrating the operation of the devices. sony cannot assume responsibility fo r any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same .
? 18 CXA3031Q filter frequency response the lpf characteristics are set to chebyshev (1db ripple) for 1.6m, 2m/inner track mode only, and to butterworth for the other modes. in addition, a custom selection can be made between chebyshev (1db ripple) and butterworth for the filter characteristics for 1.6m, 2m/inner track mode only; in that case, it is not possible to change between 1.6m/inner track and 2m/inner track. as a result, the 1.6m and 2m characteristics and fc ratio are identical. f o n ( d i f f e r e n t i a l c h a r a c t e r i s t i c s ) f o b b . p . f q = 0 . 5 7 7 f c n ( c o m p r e h e n s i v e c h a r a c t e r i s t i c s ) ( h i g h - b a n d n o i s e c u t o f f ) l . p . f t e r t i a r y b u t t e r w o r t h l . p . f t e r t i a r y c h e b y s h e v 1 d b r p ( n = 1 , 2 , 3 ) f c 4 f o 4 1 m / o u t e r t r a c k , i n n e r t r a c k 1 . 6 m , 2 m / o u t e r t r a c k 1 . 6 m , 2 m / i n n e r t r a c k the bpf center frequency f ob is fixed at 1.2 times the lpf cutoff frequency. f ob = 1.2fc in the comprehensive characteristics, the relationship between the peak frequencies fo and fc is as follows, depending on the differences of the lpf type: butterworth characteristics fcn = 1.28fon (n = 1, 2, 3) chebyshev (1 db ripple characteristics) fc4 = 1.12fo4
? 19 CXA3031Q custom selection of filters regarding the lpf cutoff frequency fo, assuming the lpf cutoff frequency f c1 in 1m/outer track mode as 1.00, the fc ratio can be selected for the other three modes. in addition, the lpf characteristics are set to chebyshev (1db ripple) for 1.6m, 2m/inner track mode only, and to butterworth for the other modes. however, a custom selection can be made between chebyshev (1db ripple) and butterworth for the filter characteristics for 1.6m, 2m/inner track mode only. (however, the 1.6m and 2m characteristics and fc ratio are identical.) note that the bpf center frequency f ob is fixed at 1.2 times f c . in addition, the ratio between f o and f c conforms with the relationship shown on the previous page. 1.0 1.07 , 1.14 , 1.23 , 1.33 , 1.45 , 1.60 , 2.00 1.33 , 1.39 , 1.45 , 1.52 , 1.60 , 1.68 , 1.78 , 1.88 , 2.00 , 2.13 , 2.29 , 2.46 , 2.67 1.33 , 1.39 , 1.45 , 1.52 , 1.60 , 1.68 , 1.78 , 1.88 , 2.00 , 2.13 , 2.29 , 2.46 , 2.67 butterworth butterworth butterworth butterworth chebyshev (1db ripple) 1m/outer track 1m/inner track 1.6m, 2m/outer track 1.6m, 2m/inner track mode lpf type fc ratio when f c1 is assumed as 1 * the boxed ratio indicates the setting for the CXA3031Q. write current setting method assuming the outer track as 1.00, the write current ratio is fixed within the ic for each mode. the write current for the outer track is set in each mode by the resistors connected to pins 25, 26, and 27. the current ratio for the inner track in each mode can be selected according to the following table. the setting is for the outer track current when xci is low, and for the inner track current when xci is high. write current inner track setting ratios 1.00 , 0.92 , 0.86 , 0.80 , 0.75 , 0.71 , 0.66 , 0.63 1.00 , 0.92 , 0.86 , 0.80 , 0.75 , 0.71 , 0.66 , 0.63 1.00 , 0.92 , 0.86 , 0.80 , 0.75 , 0.71 , 0.66 , 0.63 1m mode 1.6m mode 2m mode track write current inner track setting ratio * the boxed ratio indicates the setting for the CXA3031Q. the write current setting for the outer track is determined according to the following formula: i w = 3.53/r w (ma o-p ) r w : [k ]
? 20 CXA3031Q erase current setting method the erase circuit in this ic generates the erase current by using a constant current circuit; the current value is determined according to the following formula, based on the resistor r e connected to pin 28. i e = 11.8/r e [ma] r e : [k ] erase current rise and fall times (refer to fig. 3) in this ic, time constants are provided for the erase current rise and fall in order to prevent bad writes due to write head crosstalk. the current rise and fall times of the constant current circuit in the ic is 1.3 s, but the potential difference va that develops in the head when the erase current is turned on and off is as shown below. because the circuit clamp is generated according to this va value, the rise and fall times differ. therefore, refer to the explanation provided below when using this ic. va = l (l: head inductance; di: erase current; dt: 1.3 s) 1. when erase current turns on (1) when the potential difference va in the head is (v cc ?1.8v) or more when the current turns on, potential difference va is generated in the head; if va is equal to (v cc ?1.8v) or more, the erase output transistor q1 shown in the circuit in fig. 3 becomes saturated, and the pin voltage is clamped at approximately 1.8v. voltage driving results, and the rise time tr is as follows: tr = [ s] l: [ h], ie: [ma], v cc : [v] (2) when the potential difference va in the head is (v cc ?1.8v) or less in this case, because va does not reach clamping level, the rise time becomes the rise time of i e in the circuits within the ic. current rise time tr = 1.3 s di dt 1 1000 l i e v cc ?1.8
? 21 CXA3031Q 2. when erase current turns off (1) when the potential difference va in the head is 0.7v or more when the current turns off, potential difference va is generated in the head by counterelectromotive force; if va is equal to approximately 0.7v or more, the positive protective diode d1 shown in the circuit in fig. 3 turns on, and the pin voltage is clamped at approximately (v cc + 0.7v). as when the erase current is turned on, voltage driving results, and the fall time tf is as follows: tf = [ s] l: [ h], i e : [ma] (2) when the potential difference va in the head is 0.7v or less in this case, because va does not reach clamping level, the fall time becomes the fall time of i e in the circuits within the ic. current fall time tf = 1.3 s 1 1000 l i e 0.7 v c c g n d d 1 ( p o s i t i v e p r o t e c t i v e d i o d e ) q 1 q 2 i e ( r i s e / f a l l t i m e : 1 . 3 s ) e r a 0 c i r c u i t s w i t h i n i c f o r e r a 1 d 2 ( n e g a t i v e p r o t e c t i v e d i o d e ) i e h i g h = a p p r o x . 2 . 2 5 v l o w = 0 v l 3 0 fig. 3. erase equivalent circuit however, in the specifications, because the value indicated is with the erase head pin shorted with the power supply so that the head voltage described earlier is not generated, the rise and fall times for the constant current circuit itself are given.
? 22 CXA3031Q f r e q u e n c y [ h z ] n o r m a l i z e d p r e a m p l i f i e r v o l t a g e g a i n a n d p h a s e v s . f r e q u e n c y f f r e q u n c y [ h z ] 1 0 0 k 1 0 m 1 m n o r m a l i z e d p r e a m p l i f i e r v o l t a g e g a i n [ d b ] 1 0 0 8 6 4 2 p h a s e [ d e g ] 1 8 0 1 3 5 9 0 4 5 0 v c c = 5 v , t a = 2 5 c x h g = h i g h , l o w v o l t a g e g a i n p h a s e 1 m / o u t e r t r a c k 1 0 k 4 m 1 m n o r m a l i z e d f i l t e r v o l t a g e g a i n [ d b ] 0 8 0 6 0 4 0 2 0 4 0 k 1 0 0 k 4 0 0 k f 0 1 = 1 7 0 [ k h z ] p h a s e [ d e g ] 1 8 0 9 0 0 9 0 1 8 0 v o l t a g e g a i n p h a s e 1 m / i n n e r t r a c k 1 0 k 4 m 1 m n o r m a l i z e d f i l t e r v o l t a g e g a i n [ d b ] 0 8 0 6 0 4 0 2 0 4 0 k 1 0 0 k 4 0 0 k p h a s e [ d e g ] 1 8 0 9 0 0 9 0 1 8 0 f r e q u e n c y [ h z ] f 0 2 = 1 8 2 [ k h z ] 1 . 6 m , 2 m / o u t e r t r a c k 1 0 k 4 m 1 m n o r m a l i z e d f i l t e r v o l t a g e g a i n [ d b ] 0 8 0 6 0 4 0 2 0 4 0 k 1 0 0 k 4 0 0 k p h a s e [ d e g ] 1 8 0 9 0 0 9 0 1 8 0 f r e q u e n c y [ h z ] f 0 3 = 3 2 0 [ k h z ] v o l t a g e g a i n p h a s e 1 . 6 m , 2 m / i n n e r t r a c k 1 0 k 4 m 1 m n o r m a l i z e d f i l t e r v o l t a g e g a i n [ d b ] 0 8 0 6 0 4 0 2 0 4 0 k 1 0 0 k 4 0 0 k p h a s e [ d e g ] 1 8 0 9 0 0 9 0 1 8 0 f r e q u e n c y [ h z ] f 0 4 = 3 4 5 [ k h z ] v o l t a g e g a i n p h a s e v o l t a g e g a i n p h a s e v c c = 5 v , t a = 2 5 c r f = 3 . 2 6 k w v c c = 5 v , t a = 2 5 c r f = 3 . 2 6 k w v c c = 5 v , t a = 2 5 c r f = 3 . 2 6 k w v c c = 5 v , t a = 2 5 c r f = 3 . 2 6 k w
? 23 CXA3031Q n o r m a l i z e d p r e a m p l i f i e r v o l t a g e g a i n + f i l t e r v o l t a g e g a i n n g v v s . a m b i e n t t e m p e r a t u r e t a t a a m b i e n t t e m p e r a t u r e [ c ] 2 0 0 2 0 4 0 6 0 8 0 0 . 5 0 1 . 0 0 1 . 5 0 n g v n o r m a l i z e d p r e a m p l i f i e r v o l t a g e g a i n + f i l t e r v o l t a g e g a i n v c c = 5 v f = 1 0 0 k h z n g v = g v / g v ( t a = 2 5 c ) v c c r f 3 . 2 6 k w 1 1 n o r m a r i z e d f i l t e r p e a k f r e q u e n c y n f 0 v s . a m b i e n t t e m p e r a t u r e t a t a a m b i e n t t e m p e r a t u r e [ c ] 0 2 0 4 0 6 0 8 0 0 . 9 5 1 . 0 0 1 . 0 5 n f 0 n o r m a l i z e d f i l t e r p e a k f r e q u e n c y v c c = 5 v n f 0 = f 0 / f 0 ( t a = 2 5 c ) v c c r f 3 . 2 6 k w 1 1 v c c s u p p l y v o l t a g e [ v ] 4 . 0 5 . 0 6 . 0 0 . 9 5 1 . 0 0 1 . 0 5 v c c r f 3 . 2 6 k w 1 1 n o r m a l i z e d f i l t e r p e a k f r e q u e n c y n f 0 v s . s u p p l y v o l t a g e v c c n f 0 n o r m a l i z e d f i l t e r p e a k f r e q u e n c y t a = 2 5 c n f 0 = f 0 / f 0 ( v c c = 5 v ) n o r m a l i z e d 1 s t m o n o s t a b l e m u l t i v i b r a t o r p u l s e w i d t h n t a v s . a m b i e n t t e m p e r a t u r e t a t a a m b i e n t t e m p e r a t u r e [ c ] 0 . 9 5 1 . 0 0 1 . 0 5 n t a n o r m a l i z e d 1 s t m o n o s t a b l e m u l t i v i b r a t o r p u l s e w i d t h v c c = 5 v n t a = t 1 / t 1 ( t a = 2 5 c ) r a 2 7 k w 1 2 v c c s u p p l y v o l t a g e [ v ] 4 . 0 5 . 0 6 . 0 0 . 9 5 1 . 0 0 1 . 0 5 n o r m a l i z e d 1 s t m o n o s t a b l e m u l t i v i b r a t o r p u l s e w i d t h n t a v s . s u p p l y v o l t a g e v c c n t a n o r m a l i z e d 1 s t m o n o s t a b l e m u l t i v i b r a t o r p u l s e w i d t h t a = 2 5 c n t a = t 1 / t 1 ( v c c = 5 v ) r a 2 7 k w 1 2 n o r m a l i z e d p r e a m p l i f i e r v o l t a g e g a i n + f i l t e r v o l t a g e g a i n n g v v s . s u p p l y v o l t a g e v c c v c c s u p p l y v o l t a g e [ v ] 4 . 0 5 . 0 6 . 0 0 . 5 0 1 . 0 0 1 . 5 0 t a = 2 5 c f = 1 0 0 k h z n g v = g v / g v ( v c c = 5 v ) v c c r f 3 . 2 6 k w 1 1 2 0 0 2 0 4 0 6 0 8 0 2 0 n g v n o r m a l i z e d p r e a m p l i f i e r v o l t a g e g a i n + f i l t e r v o l t a g e g a i n
? 24 CXA3031Q n o r m a l i z e d r e a d d a t a p u l s e w i d t h n t b v s . a m b i e n t t e m p e r a t u r e t a t a a m b i e n t t e m p e r a t u r e [ c ] 0 . 9 5 1 . 0 0 1 . 0 5 n t b n o r m a l i z e d r e a d d a t a p u l s e w i d t h v c c = 5 v n t b = t 2 / t 2 ( t a = 2 5 c ) v c c s u p p l y v o l t a g e [ v ] 4 . 0 5 . 0 6 . 0 0 . 9 5 1 . 0 0 1 . 0 5 n o r m a l i z e d r e a d d a t a p u l s e w i d t h n t b v s . s u p p l y v o l t a g e v c c n t b n o r m a l i z e d r e a d d a t a p u l s e w i d t h t a = 2 5 c n t b = t 2 / t 2 ( v c c = 5 v ) n o r m a l i z e d w r i t e c u r r e n t n i w v s . a m b i e n t t e m p e r a t u r e t a t a a m b i e n t t e m p e r a t u r e [ c ] 0 . 9 5 1 . 0 0 1 . 0 5 n i w n o r m a l i z e d w r i t e c u r r e n t v c c 1 . 3 k w 2 5 v c c r w 2 1 . 3 k w 2 6 v c c r w 3 1 . 3 k w 2 7 v c c s u p p l y v o l t a g e [ v ] 4 . 0 5 . 0 6 . 0 0 . 9 5 1 . 0 0 1 . 0 5 n o r m a l i z e d w r i t e c u r r e n t n i w v s . s u p p l y v o l t a g e v c c n i w n o r m a l i z e d w r i t e c u r r e n t t a = 2 5 c n i w = i w / i w ( v c c = 5 v ) v c c r w 1 1 . 3 k w 2 5 v c c r w 2 1 . 3 k w 2 6 v c c r w 3 1 . 3 k w 2 7 t a a m b i e n t t e m p e r a t u r e [ c ] 0 . 9 5 1 . 0 0 1 . 0 5 v c c = 5 v n i e = i e / i e ( t a = 2 5 c ) n o r m a l i z e d e r a s e c u r r e n t n i e v s . a m b i e n t t e m p e r a t u r e t a n i e n o r m a l i z e d e r a s e c u r r e n t 1 . 3 k w 2 8 v c c r e v c c s u p p l y v o l t a g e [ v ] 4 . 0 5 . 0 6 . 0 0 . 9 5 1 . 0 0 1 . 0 5 n o r m a l i z e d e r a s e c u r r e n t n i e v s . s u p p l y v o l t a g e v c c n i e n o r m a l i z e d e r a s e c u r r e n t t a = 2 5 c n i e = i e / i e ( v c c = 5 v ) 1 . 3 k w 2 8 v c c r e 0 2 0 4 0 6 0 8 0 2 0 0 2 0 4 0 6 0 8 0 2 0 0 2 0 4 0 6 0 8 0 2 0 v c c = 5 v n i w = i w / i w ( t a = 2 5 c ) r w 2 r w 1
? 25 CXA3031Q 1 m / o u t e r t r a c k p e a k f r e q u e n c y f 0 1 v s . r f r f [ k w ] 2 . 0 3 . 0 4 . 0 1 5 0 2 0 0 2 5 0 1 m / o u t e r t r a c k p e a k f r e q u e n c y f 0 1 [ k h z ] r f 1 1 v c c v c c = 5 v t a = 2 5 c f 0 1 = 5 3 4 / r f + 6 . 2 t a a m b i e n t t e m p e r a t u r e [ c ] 2 0 0 2 0 4 0 6 0 8 0 3 . 6 4 . 1 p o w e r s u p p l y o n / o f f d e t e c t o r t h r e s h o l d v o l t a g e v t h v s . a m b i e n t t e m p e r a t u r e t a v t h p o w e r s u p p l y o n / o f f d e t e c t o r t h r e s h o l d v o l t a g e [ v ] 3 . 8 4 . 0 3 . 7 3 . 9 3 1 0 0 . 3 1 . 0 1 0 . 0 1 s t m o n o s t a b l e m u l t i v i b r a t o r p u l s e w i d t h t a v s . r a r a [ k w ] t a 1 s t m o n o s t a b l e m u l t i v i b r a t o r p u l s e w i d t h [ s ] 5 1 0 0 5 0 0 . 5 r a 1 2 v c c = 5 v t a = 2 5 c t 1 1 m t 1 2 m 5 . 0 0 . 5 1 1 5 5 0 e r a s e c u r r e n t i e v s . r e r e [ k w ] i e e r a s e c u r r e n t [ m a ] r e 2 7 v c c 1 0 5 1 0 v c c = 5 v t a = 2 5 c v c c r w 1 2 5 v c c r w 2 2 6 v c c r w 3 2 7 0 . 1 1 0 . 5 5 5 0 w r i t e c u r r e n t i w v s . r w r w [ k w ] i w w r i t e c u r r e n t [ m a ] 0 . 5 1 0 5 1 1 0 v c c = 5 v t a = 2 5 c t 1 1 m = 8 8 r a + 1 2 4 t 1 2 m = 4 4 r a + 6 2 r a [ k w ] i e = 1 1 . 8 / r e r e [ k w ] i w = 3 . 5 3 / r w r w [ k w ]
? 26 CXA3031Q package outline unit: mm s o n y c o d e e i a j c o d e j e d e c c o d e p a c k a g e m a t e r i a l l e a d t r e a t m e n t l e a d m a t e r i a l p a c k a g e m a s s e p o x y r e s i n s o l d e r p l a t i n g 4 2 a l l o y 3 2 p i n q f p ( p l a s t i c ) 9 . 0 0 . 2 7 . 0 0 . 1 1 . 5 0 . 1 5 ( 8 . 0 ) 0 . 1 0 . 1 + 0 . 2 + 0 . 3 5 + 0 . 3 0 . 5 0 0 . 1 2 7 0 . 0 5 + 0 . 1 0 t o 1 0 0 . 8 0 . 3 0 . 1 + 0 . 1 5 1 8 9 3 2 1 6 1 7 2 4 2 5 m 0 . 2 4 0 . 2 g q f p - 3 2 p - l 0 1 q f p 0 3 2 - p - 0 7 0 7 0 . 1

▲Up To Search▲

Price & Availability of CXA3031Q

	To Download CXA3031Q Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .