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description the cxa1597m/p is a bipolar ic developed for recording equalizer amplifier in analog cassette decks. it is suited specifically for double cassette decks. incorporating the filter circuit greatly reduces the external parts. features built-in filter required for recording equalizer amplifiers inductor (coil) is unnecessary low frequency boost is possible with an external capacitor built-in recording mute function (requiring only an external time constant circuit to implement soft mute) fade in/out dc controllable norm/cro 2 /metal tape mode switching function norm/high tape speed recording switching function dc controllable for recording level calibration (approximately 6db variable) dc controllable for high frequency equalizer amplifier gain (approximately 4db variable) built-in 2 channels small package applications recording equalizer amplifier for stereo analog cassette decks (supports alps electric co., ltd. hadkh55-series heads) block diagram and pin configuration structure bipolar silicon monolithic ic absolute maximum ratings supply voltage v cc 17 v operating temperature topr ?0 to +75 ? storage temperature tstg ?5 to +150 ? allowable power dissipation p d (cxa1597m) 500 mw (cxa1597p) 900 mw operating conditions supply voltage dual power supplies (v cc ?v ee ) 5.0 to 8.0 v single power supply (v cc ) 10.0 to 16.0 v ?1 cxa1597m/p e95127-st recording equalizer amplifier for stereo cassette decks 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. cxa1597m 16 pin sop (plastic) cxa1597p 16 pin dip (plastic) 9 10 11 12 13 14 15 16 iref rec out2 boost2 v cc rec in2 rec mute rec cal gp cal gnd 2 3 4 5 6 7 8 1 rec out1 boost1 v ee rec in1 tape eq dgnd speed bias vg control rec eq 2 rec eq 1 cxa1597m/p
?2 cxa1597m/p pin description (ta = 25?, v cc = 7.0v, v ee = ?.0v, dv cc = 5.0v) pin no. symbol i/o z (in) equivalent circuit description typical pin voltage dc ac 1 speed i tape speed switching pin. * normal/double speed switching. high = double speed low = normal speed 10k 1 dgnd 2 tape eq i tape equalizer amplifier switching * (norm/cro 2 / metal switching) pin. high = rec eq metal medium = rec eq cro 2 low = rec eq norm 2.5v 3 dgnd i connect to gnd. 0.0v 50k 5k 5k dgnd 2 4 13 rec in1 rec in2 i 50k recording equalizer amplifier input pin. 0.0v ?8dbv 13 gnd 50k 4 5 gnd (vg) i 15k connect to gnd for positive/ negative dual power supplies. vcc/2 (center potential) for a single power supply. (connect a capacitor of 10f or more) 0.0v 30k 30k gnd 5
?3 cxa1597m/p 6 11 boost1 boost2 i 9.5k connection pin of an external capacitor for low frequency boost. * when low frequency boost is unnecessary, connect to gnd for positive/ negative dual power supplies; connect a capacitor (3.3f or more) for a single power supply. 0.0v 7 v ee i connect to the negative power supply for positive/negative dual power supplies. connect to gnd for a single power supply. ?.0v 11 4.8k 5.5k 35.5k 280 280 34k gnd 6 8 9 rec out1 rec out2 o 50k recording equalizer amplifier output pin. 0.0v ?dbv 9 50k 200 200 8 12 iref o reference current setting pin for monolithic filter. * the reference current can be set by attaching a resistor between this pin and the v ee pin. v ee + 1.2v 200 6k 12 10 v cc i positive power supply connection pin. 7.0v pin no. symbol i/o z (in) equivalent circuit description typical pin voltage dc ac
?4 cxa1597m/p 15 rec mute i recording mute on/off selection pin. * recording mute is controlled with dc voltages of 0 to 5v. high = recording mute off low = recording mute on * soft mute and fader can be switched over by changing the time constant of the external time constant circuit. 30k 54k dgnd 2.5v 15 16 gp cal i 54k high frequency calibration pin. * controlled with dc voltages of 0 to 5v high = high frequency level gain increased low = high frequency level gain reduced * leave this pin open when not using the high frequency calibration function. 2.5v 54k dgnd 2.5v 54k 16 pin no. symbol i/o z (in) equivalent circuit description typical pin voltage dc ac 14 rec cal i 54k * recording level calibration pin. high = recording level gain increased low = recording level gain reduced * leave this pin open when not using the recording level calibration function. 2.5v 54k dgnd 54k 14 2.5v
?5 cxa1597m/p electrical characteristics (ta = 25?, v cc = 7.0v, v ee = ?.0v) recording equalizer amplifier reference output level (315hz) (this output level is the tape reference 0db which generates magnetic flux of 250nwb/m) all of the recording equalizer amplifier blocks use this level as their reference level. input level when the reference output level is 315hz, ?.0dbv (for measurement, input a 315hz, ?8.5dbv signal to the rec in pins (pins 4 and 13) and then measure the output level.) norm-tape, norm-speed mode input a 3khz signal (?0db level down) to the rec in pins and then measure the relative deviation from norm-ns, 315hz mode. norm-tape, norm-speed mode input a 8khz signal (?0db level down) to the rec in pins and then measure the relative deviation from norm-ns, 315hz mode. norm-tape, norm-speed mode input a 12khz signal (?0db level down) to the rec in pins and then measure the relative deviation from norm-ns, 315hz mode. cro 2 -tape, norm-speed mode input a 3khz signal (?0db level down) to the rec in pins and then measure the relative deviation from norm-ns, 315hz mode. cro 2 -tape, norm-speed mode input a 8khz signal (?0db level down) to the rec in pins and then measure the relative deviation from norm-ns, 315hz mode. cro 2 -tape, norm-speed mode input a 12khz signal (?0db level down) from the reference to the rec in pins and then measure the relative deviation from norm-ns, 315hz mode. metal-tape, norm-speed mode input a 3khz signal (?0db level down) to the rec in pins and then measure the relative deviation from norm-ns, 315hz mode. metal-tape, norm-speed mode input a 8khz signal (?0db level down) to the rec in pins and then measure the relative deviation from norm-ns, 315hz mode. 8.0 5.0 10.0 ?0.0 ?.9 2.5 7.3 2.9 7.1 11.3 3.9 7.1 12.0 7.0 14.0 ?.0 ?8.5 ?.4 4.5 10.3 4.4 9.1 14.3 5.4 9.1 16.0 8.0 16.0 ?7.0 1.1 6.5 13.3 5.9 11.1 17.3 6.9 11.1 ma v v dbv dbv db db db db db db db db current consumption (i cc ) operating voltage range 1 (positive/ negative dual power supplies) operating voltage range 2 (single power supply) recording equalizer amplifier recording reference output level norm-norm mode recording equalizer amplifier recording reference input level norm-norm mode norm-norm mode rec-eq frequency response 1 (3khz, ?0db) norm-norm mode rec-eq frequency response 2 (8khz, ?0db) norm-norm mode rec-eq frequency response 3 (12khz, ?0db) cro 2 -norm mode rec-eq frequency response 1 (3khz, ?0db) cro 2 -norm mode rec-eq frequency response 2 (8khz, ?0db) cro 2 -norm mode rec-eq frequency response 3 (12khz, ?0db) metal-norm mode rec-eq frequency response 1 (3khz, ?0db) metal-norm mode rec-eq frequency response 2 (8khz, ?0db) item conditions min. typ. max. unit entire lsi recording equalizer amplifier
?6 cxa1597m/p metal-tape, norm-speed mode input a 12khz signal (?0db level down) to the rec in pins and then measure the relative deviation from norm-ns, 315hz mode. norm-tape, high-speed mode input a 5khz signal (?0db level down) to the rec in pins and then measure the relative deviation from norm-ns, 315hz mode. norm-tape, high-speed mode input a 15khz signal (?0db level down) to the rec in pins and then measure the relative deviation from norm-ns, 315hz mode. norm-tape, high-speed mode input a 20khz signal (?0db level down) to the rec in pins and then measure the relative deviation from norm-ns, 315hz mode. cro 2 -tape, high-speed mode input a 5khz signal (?0db level down) to the rec in pins and then measure the relative deviation from norm-ns, 315hz mode. cro 2 -tape, high-speed mode input a 15khz signal (?0db level down) to the rec in pins and then measure the relative deviation from norm-ns, 315hz mode. cro 2 -tape, high-speed mode input a 20khz signal (?0db level down) to the rec in pins and then measure the relative deviation from norm-ns, 315hz mode. metal-tape, high-speed mode input a 5khz signal (?0db level down) to the rec in pins and then measure the relative deviation from norm-ns, 315hz mode. metal-tape, high-speed mode input a 15khz signal (?0db level down) to the rec in pins and then measure the relative deviation from norm-ns, 315hz mode. metal-tape, high-speed mode input a 20khz signal (?0db level down) to the rec in pins and then measure the relative deviation from norm-ns, 315hz mode. norm-tape, norm-speed mode, rl = 2.7k input a 1khz signal and set the output so that thd (total harmonic distortion) is 1%. (measure the distortion of a +11db level-up signal.) norm-tape, norm-speed mode, rl = 2.7k input a 1khz, 0.0db (reference input level) signal and measure the distortion. (measure the distortion as thd + n.) 10.4 ?.3 4.0 7.4 3.9 8.6 11.4 5.9 9.5 11.8 11.0 13.4 0.2 6.5 10.9 5.4 11.1 14.9 7.4 12.0 15.3 12.0 0.14 16.4 1.7 9.0 14.4 6.9 13.6 18.4 8.9 14.5 18.8 0.6 db db db db db db db db db db db % metal-norm mode rec-eq frequency response 3 (12khz, ?0db) norm-high mode rec-eq frequency response 1 (5khz, ?0db) norm-high mode rec-eq frequency response 2 (15khz, ?0db) norm-high mode rec-eq frequency response 3 (20khz, ?0db) cro 2 -high mode rec-eq frequency response 1 (5khz, ?0db) cro 2 -high mode rec-eq frequency response 2 (15khz, ?0db) cro 2 -high mode rec-eq frequency response 3 (20khz, ?0db) metal-high mode rec-eq frequency response 1 (5khz, ?0db) metal-high mode rec-eq frequency response 2 (15khz, ?0db) metal-high mode rec-eq frequency response 3 (20khz, ?0db) norm-norm mode rec-eq signal handling norm-norm mode rec-eq total harmonic distortion (1khz, 0.0db, rl = 2.7k ) recording equalizer amplifier item conditions min. typ. max. unit
?7 cxa1597m/p norm-tape, norm-speed mode, rg = 5.1k with no signal, measure the noise using the "a"- wgt filter. (the measured value is indicated as the relative value compared to the reference level.) norm-tape, norm-speed mode with no signal, measure the dc offset voltage of the rec out pin. norm-tape, norm-speed mode, rec-mute = 0.5v input a 1khz signal (+12db level up) and measure the attenuation when rec mute is on. (use a 1khz bpf.) norm-tape, norm-speed mode, rec-mute = 2.5v input a 1khz, 0.0db (reference level) signal and measure the attenuation characteristics curve of the soft mute function. (when rec-mute = 2.5v) norm-tape, norm-speed mode, rec-cal = 5.0v input a 315hz signal (?0db level down) and measure the amount of change compared to when the rec-cal function is at the standard setting. norm-tape, norm-speed mode, rec-cal = 0.0v input a 315hz signal (?0db level down) and measure the amount of change compared to when the rec-cal function is at the standard setting. norm-tape, norm-speed mode, gp-cal = 5.0v input a 8khz signal (?0db level down) and measure the amount of change compared to when the gp-cal function is at the standard setting. norm-tape, norm-speed mode, gp-cal = 0.0v input a 8khz signal (?0db level down) and measure the amount of change compared to when the gp-cal function is at the standard setting. tape eq control pin voltage tape eq control pin voltage tape eq control pin voltage speed control pin voltage speed control pin voltage 57 ?00 ?.0 4.1 ?.9 3.9 ?.9 4.2 2.2 0.0 3.5 0.0 65 0.0 ?1 ?.5 6.1 ?.9 5.9 ?.9 500 ?0 ?.0 8.1 ?.9 7.9 ?.9 v cc 2.8 0.5 v cc 0.5 db mv db db db db db db v v v v v norm-norm mode rec-eq s/n ratio 1 ("a"-wgt filter) norm-norm mode output dc offset voltage (rec out pin) norm-norm mode rec-eq mute characteristics 1 (rec-mute = 0.5v) norm-norm mode rec-eq mute characteristics 2 (rec-mute = 2.5v) norm-norm mode rec-eq rec-cal characteristics 1 (rec-cal = 5.0v) norm-norm mode rec-eq rec-cal characteristics 2 (rec-cal = 0.0v) norm-norm mode rec-eq gp-cal characteristics 1 (gp-cal = 5.0v) norm-norm mode rec-eq gp-cal characteristics 2 (gp-cal = 0.0v) recording equalizer amplifier mode control control circuit high level mode control control circuit medium level mode control control circuit low level mode control control circuit high level mode control control circuit low level control circuit ternary switching binary switching item conditions min. typ. max. unit
?8 cxa1597m/p electrical characteristics measurement circuit rec out2 v cc boost2 iref rec in2 rec cal rec mute gp cal rec out1 v ee boost1 gnd (vg) rec in1 dgnd tape eq speed cxa1597m/p a 9 10 11 12 13 14 15 16 2 3 4 5 6 7 8 1 * r12 5.1k * r13 27k sw8 c8 2.2 sw6 ac voltmeter distortion analyzer oscilloscope dc voltmeter * r17 2.7k sw10 "a" wtg din audio 1khz bpf noise filter dc 5v supply power supply power supply audio sg dc ammeter dc ammeter gnd 0.5v 2.5v 4.0v 5.0v * r7 620 c6 10 r10 10k sw1 rec mute off on c2 1 25v c3 1 25v on off sw5 cal on/off c1 100 25v rec cal 50k gp cal * r6 2k * r4 27k * r2 18k * r1 2k * r3 27k * r5 18k note 1. resistor tolerance 2. capacitor tolerance coupling capacitor ?% ?% ?% ?% 10% * : * : 50k * c11 0.47 c13 100 c15 4.7 50v r19 100 r15 10k sw12 2ch 1ch sw14 filter out in sw2 speed high sw3 metal sw4 metal metal 120s 70s norm r9 10k r8 10k c4 10 c5 10 sw7 c7 2.2 * r11 5.1k sw9 c9 10 * c10 0.47 c12 100 25v c14 4.7 50v r14 10k r18 100 * r16 2.7k sw11 2ch 1ch sw13 sw15 sw16 sw17 a
?9 cxa1597m/p application circuit (positive/negative dual power supplies) rec out2 v cc boost2 iref rec in2 rec cal rec mute gp cal rec out1 v ee boost1 gnd (vg) rec in1 dgnd tape eq speed cxa1597m/p c8 3.3 50v r7 12k c12 75p l2 27mh rec out2 (to head) c10 150p c7 3.3 50v r6 12k c9 150p l1 27mh c11 75p gnd gnd gnd gnd gnd gnd rec cal (dc control) rec mute (soft mute/fader) gp cal (dc control) tape speed (norm/high) tape eq (metal/cro2/normal) line in1 v ee c4 0.47 35v r3 27k c2 3.3 50v rv2 10k r2 10k r5 5.6k gnd gnd line in2 v cc v ee c6 100 25v c3 0.47 35v c1 3.3 50v rv1 10k r1 10k r4 5.6k c5 100 25v v ee 9 10 11 12 13 14 15 16 2 3 4 5 6 7 8 1 rec out1 (to head) 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.
?10 cxa1597m/p description of operation 1. recording equalizer amplifier the primary features of the cxa1597 recording equalizer amplifier are that by taking full advantage of monolithic filter technology, an lc resonance circuit consisting of a coil and capacitor normally required for high frequency compensation is dispensed with and medium and low-frequency sensitivity compensation is performed with its internal filter alone. this ic has the circuit configuration shown in fig. 1 to provide the optimum frequency response required for recording equalizer amplifiers. l1 27mh gnd gnd gnd r1 50k v cc gm3 1 1 gm2 gm5 op4 1 op3 op2 vgs r7 34k vgs r3 35k r8 4.8k c1 0.47 gnd c2 200p r4 5.5k r11 40k gnd r13 50k r9 24k r10 8k c4 100p gnd c3 100p gnd r5 20k r6 20k r2 5k vgs vgs gnd gnd gm4 vgs bias control ?dbv ?dbv +6dbv rec out ?dbv ?dbv ?dbv 0dbv rec in ?8.5dbv v cc v ee gnd (vg) iref dgnd tape eq rec mute speed to control ic v ee gnd v ee r1 27k gnd gnd rec head bias osc c7 75p r14 12k c5 3.3 c6 150p gnd rec cal calibration gp cal dv cc r15 50k r16 50k boost ifm igl igh if/q ifq igp fig. 1. cxa1597 functional circuit block diagram the symbols (gm2, gm3, gm4, gm5) shown in fig. 1 denote "voltage ? current converter circuits" and "multiplier circuits." the "voltage ? current converter circuits" convert the voltage between the positive and negative input pins into current by using the ic's internal resistance. the "multiplier circuits" multiply the current generated by the "voltage ? current converter circuits" with a coefficient. the recording equalizer amplifier requires the six parameters shown in fig. 2 (g l , g h , g p , f m , f p , and q) to implement its frequency response. these parameters are controlled by each control current shown in fig. 1 (igl, igh, igp, ifm, if/q, and ifq). therefore, the cxa1597 reduces fluctuations caused by the temperature characteristics and unevenness of its internal resistance by using currents which are independent of the internal resistance (currents which depend on external resistance) and those which are dependent on the internal resistance. this ic uses currents dependent on the internal resistance where equalizer amplifier gain is determined and currents dependent on external resistance where the filter time constant is determined. this is because the generatrix of the coefficient for the "multiplier circuits" is generated in the ic so that it depends on the internal resistance. consequently, the gain relationship of g l , g h and g p is such that because the current obtained by the "voltage ? current converter circuits" is converted into voltage by the i-v amplifier in the final stage of fig. 1, the control currents are controlled by currents dependent on the internal resistance. in this way, the coefficients for conversion [voltage ? current ? voltage] all become ratios to the internal resistance, so that the fluctuations of temperature characteristics and unevenness are reduced.
?11 cxa1597m/p also, the relationship of time constants f m , f p and q is configured by the product of the current obtained with the "voltage ? current converter circuits" and the ic's internal capacitance connected to the output of each "multiplier circuit". by using the currents determined by the cxa1597 external resistance which are not dependent on the internal resistance for control, the coefficients for voltage ? current conversion become certain ratios to the internal resistance; therefore, the frequency response does not depend on the internal resistance. g p q g h f p f m g l low frequency boost gain [db] frequency [hz] fig. 2. conceptual diagram of cxa1597 frequency response 2. low frequency boost the cxa1597 implements low frequency boost simply by attaching an external capacitor. as shown in fig. 1, this ic contains a resistance-based attenuation circuit after the input amplifier, with one of the resistors connected to the boost pins (pins 6 and 11). when a capacitor is connected to these boost pins (pins 6 and 11), the following transfer function is obtained. g boost (s) = (s = j w ) from the above, items f 1 , f 2 , a 1 , and a 2 in fig. 3 are transformed into the following: f 1 = = f 2 = a 1 = a 2 = = s ?c 1 ?r 7 ?r 8 + r 7 s ?c 1 ?(r 4 ?r 7 + r 7 ?r 8 + r 8 ?r 4 ) + (r 4 + r 7 ) r 4 + r 7 2 ?c 1 ?(r 4 ?r 7 + r 7 ?r 8 + r 8 ?r 4 ) r 7 ?r 8 r 4 ?r 7 + r 7 ?r 8 + r 8 ?r 4 r 4 ?r 7 r 4 + r 7 1 ( ) 2 ?c 1 ? + r 8 r 7 ?r 8 r 7 + r 8 r 7 ?r 8 r 7 + r 8 r 4 + 1 2 ?c 1 ?r 8 r 7 r 4 + r 7
?12 cxa1597m/p here, r 4 = 5.5k , r 7 = 34k , and r 8 = 4.8k . therefore, a 1 and a 2 take on the following values. a 1 = 0.861 (times) = ?.30 (db); a 2 = 0.433 (times) = ?.26 (db) the difference between a 1 and a 2 is approximately 6 db, so that 6 db boost can be applied for low frequency boost. the boost frequency response can be freely set with the value of the external c 1 capacitor. f 2 f 1 gain [db] frequency [hz] 6db oct a 1 a 2 fig. 3. cxa1597 low frequency boost frequency response 3. recording mute function the cxa1597 recording mute function is implemented by using a built-in recording mute circuit which varies the recording equalizer amplifier gain according to the magnitude of the dc voltage applied to the rec mute pin (pin 15) just like an electronic volume control. for this reason, any desired soft mute (gradual signal attenuation without distortion) or fader (fade in/out) can be freely set depending on momentary changes in the dc voltage applied to the rec mute pin (pin 15). the cxa1597 recording mute circuit operation is such that the reference voltage source used to generate the control currents (igl, igh, and igp) to control each gain (g l , g h , and g p ) shown in fig. 1 is varied by the voltage input to the rec mute pin (pin 15), so that the recording signal is attenuated while maintaining the respective gain ratios. eventually, when the recording signal is completely muted, only the i-v amplifier in the final stage is connected to the output pin (rec out). therefore, the noise of the monolithic filter consisting of each "voltage ? current converter circuit" and "multiplier circuit" is attenuated simultaneously with the recording signal. at this point in time, the i-v amplifier in the final stage is functioning almost as a buffer, providing a significant amount of mute. fig. 4 illustrates the recording mute waveforms. fig. 4. recording mute waveform
?13 cxa1597m/p 4. recording level calibration function the cxa1597 allows the recording level to be finely adjusted with a dc voltage. the recording equalizer amplifier gain can be varied by approximately 6db simply by applying dc voltage to the rec cal pin (pin 14). circuit operation for this function is such that each gain (g l , g h , and g p ) is varied relative to the reference voltage source which controls currents (igl, igh, and igp) by varying its voltage as in the case of the recording mute circuit. the input resistance of the rec cal pin (pin 14) is 54k as described in the pin description, which is equivalent to the internal resistance. this means the voltage converted into current by the internal resistance is the difference between the dc voltage applied to the rec cal pin (pin 14) and the internal reference voltage (2.5v), so that all coefficients become ratios to the internal resistance. recording level can be finely adjusted independent of the temperature characteristics and unevenness inherent in the ic. this recording calibration function performs in all modes (norm/cro 2 /metal tape, norm/high speeds, as well as the recording mute mode). when not using the recording level calibration function, simply leave the rec cal pin (pin 14) open, and the voltage on the rec cal pin (pin 14) is matched to the internal reference voltage (2.5v), with the recording level set for the standard output gain. 5. high frequency equalizer amplifier calibration function in addition to the recording level calibration function, the cxa1597 allows high frequency equalizer amplifier characteristics to be controlled with dc voltage. by simply applying dc voltage to the g p cal pin (pin 16) as in the case of the recording level calibration function, the recording equalizer amplifier gain (only the g p gain) can be varied by approximately 4db. this function also relatively varies the g p gain when the recording level calibration function is activated. circuit operation for this function is such that the voltage applied to the pin is converted into current by the internal resistance as in the case of recording level calibration, and that the "multiplier circuits" provide a coefficient to the control current according to the value of the g p gain control current (igp) for the mode currently set. therefore, the calibration of high frequency equalizer amplifier characteristics is independent of the temperature characteristics and unevenness inherent in the ic, as in the case of recording level calibration. this function, too, operates in all modes. when not using the high frequency equalizer amplifier calibration function, simply leave the g p cal pin (pin 16) open, and the high frequency equalizer amplifier characteristics are set for standard output gain. fig. 5 schematically shows the recording level/high frequency equalizer amplifier calibration functions. fig. 5. conceptual diagram of recording level/high frequency equalizer amplifier calibration functions the noise level of the recording equalizer amplifier is relatively changed by varying its frequency characteristics. gp cal f p f m rec cal gain [db] frequency [hz] rec cal rec cal
?14 cxa1597m/p 6. temperature characteristics and accuracy of the recording equalizer amplifier the temperature characteristics of the built-in monolithic filter and the filter cut-off frequency depend on the 27k external resistance connected to the iref pin (pin 12). for low frequency boost, however, the cut-off frequency becomes uneven depending on the temperature characteristics or unevenness of the internal resistance since its time constant is configured by the product of an external capacitor and the internal resistance. also, the recording equalizer frequency response depends on unevenness in the absolute, as well as relative values of the internal capacitance. furthermore, the high frequency response indicates a high element sensitivity at the filter because the band-pass filter q is high. compared to low frequency, although the unevenness inherent in the ic is more likely to occur, this occurs relatively, and not individually for channels 1 and 2.
?15 cxa1597m/p notes on operation 1. power supply the cxa1597 is designed basically for positive/negative dual power supplies, and can also operate with a single power supply. connect the power supplies for each case as shown below: v cc (pin 10) v ee (pin 7) gnd (pin 5) dgnd (pin 3) positive/negative dual power supplies single power supply positive power supply power supply negative power supply gnd gnd * gnd gnd control voltage min. max. 3-state 2-state high level medium level low level high level low level h high speed metal tape 4.2 2.2 0.0 3.5 0.0 v cc 2.8 0.5 v cc 0.5 * for a single power supply, connect a decoupling capacitor (10f or more) to the gnd (vg) pin (pin 5). the ripple rejection ratio depends on the capacitance of this capacitor. 2. operation mode control (norm/cro 2 /metal tape, norm/high speed) the cxa1597 incorporates an electronic switch and its operation is controlled by the dc voltage applied to the two mode control pins - tape eq pin (pin 3) and speed pin (pin 1). the mode control voltages are as follows the voltages in the table to the left are the values relative to dgnd. operation mode control table pin no. pin name pin voltage remarks m cro 2 tape l normal speed normal tape 2-state 3-state 1 2 note: pin voltage = medium when the 3-state input pin is open. speed tape eq if the switching click noise presents a problem, add time constant circuits of 0.1 to 1s to the mode control pins. since the mode control circuit has a linear region of approximately 300mv, this time constant circuit may effectively reduce the switching click noise.
?16 cxa1597m/p 3. recording mute function (soft mute, fade in/out) as described in description of operation, the cxa1597 recording mute function is implemented by using a built-in recording mute circuit which varies the recording equalizer amplifier gain according to the magnitude of the dc voltage applied to the rec mute pin (pin 15) just like an electronic volume control. consequently, the muting time can be varied according to momentary changes of the dc voltage applied to the rec mute pin (pin 15) and, furthermore, the recording signal can be gradually attenuated without causing distortion. the table below shows the relationship between the dc voltage applied to the rec mute pin (pin 15) and the attenuation. control voltage recording mute on attenuation ?.6db recording mute off positive/negative dual power supplies single power supply dgnd to 0.5v dgnd to 0.5v 2.5v 2.5v 4.0v to v cc 4.0v to v cc * referenced to the dgnd pin (pin 3). 4. low frequency boost (low frequency compensation) the cxa1597 low frequency boost function can be implemented simply by connecting a capacitor to the boost pins (pins 6 and 11) as described in description of operation. although the boost is fixed to 6db, the time constant which determines the cut-off frequency can be set to any desired value depending on the capacitance of the external capacitor. the pole (f1) and zero (f2) shown in fig. 3. low frequency boost frequency response can be expressed, with the external capacitor assumed to be cb, as follows: f 1 = (hz), f 2 = (hz) based on the above equation, determine the best low frequency response. however, the resistance which determines the time constant along with the external capacitor is the internal resistance, so that the cut-off frequency tends to fluctuate depending on the unevenness and temperature characteristics inherent in the ic. note that the unevenness and the temperature characteristics of the internal resistance that determines the low frequency boost frequency response are approximately 20% and +2500 ppm/?, respectively. when not using low frequency boost, follow the procedure described below. a) for positive/negative dual power supplies connect the boost pins (pins 6 and 11) to gnd. b) for single power supply connect a fairly large capacitor (3.3f or more) to the boost pins (pins 6 and 11) or simply leave the boost pins open. if the boost pins are left open, note that the output level increases by 6db, so the input reference should be set 6db down. the cxa1597 is basically designed for positive/negative dual power supplies and the boost pins cannot be easily connected to gnd as in the case of positive/negative dual power supplies. 1 2 ?c b ?(9.53k ) 1 2 ?c b ?(4.8k )
?17 cxa1597m/p 5. recording level calibration the cxa1597 allows the recording level to be finely adjusted with a dc voltage as described in description of operation. therefore, the recording level can be varied by approximately 6db simply by applying dc voltages of 0 to 5v (for positive/negative dual power supplies) to the rec cal pin (pin 14). the table below shows the input range regulation of control voltages with the power supplies used. * 1 , * 2 up typ. down positive/negative dual power supplies single power supply 2.5v to v cc 2.5v to v cc 2.5v 2.5v dgnd to 2.5v dgnd to 2.5v * 1 although the above range of voltages can be input to the control pin, the controllable input voltage range is as follows: 2.5v < vup 5.0v dgnd vdown < 2.5v * 2 control voltages for this ic are referenced to the dgnd pin (pin 3). also note that when not using this recording calibration function, simply leave the rec cal pin (pin 14) open, so that the voltage on the rec cal pin is matched to the internal reference voltage (2.5v), with the recording level set for the standard gain. 6. high frequency calibration the cxa1597 allows the high frequency equalizer amplifier characteristics to be finely adjusted with a dc voltage as described in description of operation. therefore, the recording level in high frequencies (peak) can be varied by approximately 4db simply by applying dc voltages of 0 to 5v (for positive/negative dual power supplies) to the g p cal pin (pin 16). the table below shows the input range regulation of control voltages with the power supplies used. * 3 , * 4 * 3 although the above range of voltages can be input to the control pin, the controllable input voltage range is as follows: 2.5v < vup 5.0v dgnd vdown < 2.5v * 4 control voltages for this ic are referenced to the dgnd pin (pin 3). also note that when not using this high frequency calibration function, simply leave the g p cal pin (pin 16) open, so that the voltage on the g p cal pin is matched to the internal reference voltage (2.5v), with the high frequency equalizer amplifier characteristics set for the standard gain. 7. monolithic filter (the resistance connected to the iref pin) to increase the accuracy of the frequency response of its internal monolithic filter, the cxa1597 entrusts the control current that determines the filter time constant to an external resistance. specifically, this resistance is the 27k external resistor connected to the iref pin (pin 12). this means that the accuracy of the recording equalizer amplifier frequency response is determined by the resistance connected to the iref pin. therefore, the resistor used for this purpose must be free of unevenness and have excellent temperature characteristics (e.g., a metallic film resistor). also note that the recording equalizer amplifier frequency response can be shifted as desired by altering the value of the resistance connected to the iref pin. for example, when the resistance value is reduced, the frequency response is shifted to the high-frequency side, and when the resistance value is increased, the frequency response is shifted to the low-frequency side. up typ. down positive/negative dual power supplies single power supply 2.5v to v cc 2.5v to v cc 2.5v 2.5v dgnd to 2.5v dgnd to 2.5v
?18 cxa1597m/p frequency response (normal speed) frequency [hz] output response [db] 10 100k 10k 1k 100 ?0.0 0.0 10.0 20.0 30.0 frequency response (high speed) frequency [hz] output response [db] 10 100k 10k 1k 100 ?0.0 0.0 10.0 20.0 30.0 v cc , v ee = 7.0v 0db = norm-norm, 315h, ?3dbv (?0db) (tape) (speed) norm - high cro 2 - high metal - high load characteristics r l ?load resistance [ w ] maximum output level [db] 100 0 10 14 1k 10k v cc , v ee = 7.0v mode: norm-norm (tape) (speed) 0db = ?dbv (rec out pin) thd + n = 1% 315hz 1khz v cc , v ee = 7.0v 0db = norm-norm, 315h, ?3dbv (?0db) (tape) (speed) norm - norm cro 2 - norm metal - norm 2 4 6 8 12 example of representative characteristics
?19 cxa1597m/p output level vs. mute voltage rec mute pin voltage [v] ?.0 1.0 3.0 5.0 0.0 2.0 4.0 6.0 0 100 80 60 40 20 output level [%] v cc , v ee = 7.0v mode: norm-norm (tape) (speed) 100% = 1khz, + 12db (at 315hz, ?dbv) f = 1khz output level vs. mute voltage rec mute pin voltage [v] 1.0 3.0 5.0 0.0 2.0 4.0 6.0 ?00 0 ?0 ?0 ?0 ?0 output level [db] v cc , v ee = 7.0v mode: norm-norm (tape) (speed) 0db = 1khz, + 12db (at 315hz, ?dbv) f = 1khz output level vs. mute voltage ?0 output level [db] rec mute pin voltage [v] 0.5 1.0 5.0 0 ?0 ?0 ?0 v cc , v ee = 7.0v mode: norm-norm (tape) (speed) 0db = 1khz, + 12db (at 315hz, ?dbv) f = 1khz total harmonic distortion output level [db] t. h. d + n [%] ?0 0.1 1.0 10 01020 v cc , v ee = 7.0v 0db = ?dbv, r l = 2.7k mode: norm-norm (tape) (speed) 315hz 1khz 3khz 6.3khz 10khz 15khz
?20 cxa1597m/p rec cal and gp cal frequency response frequency [hz] output response [db] 10 100k 10k 1k 100 ?0.0 0.0 10.0 20.0 40.0 v cc , v ee = 7.0v 0db = norm-norm, 315hz, ?3dbv (?0db) rec cal & gp cal open (tape) (speed) gp cal = 5.0v gp cal = 2.5v gp cal = 0.0v 30.0 rec cal = 5.0v rec cal = 2.5v rec cal = 0.0v output level vs. rec cal voltage rec cal pin voltage [v] output level [db] ?0 0 10 ?.0 1.0 5.0 ?.0 0.0 4.0 2.0 3.0 8.0 7.0 6.0 v cc , v ee = 7.0v mode: norm-norm gp cal = open (tape) (speed) 0db = rec cal pin and gp cal pin open ?0db (at 315hz, ?dbv) 315hz 3khz 8khz 12khz output level vs. gp cal voltage gp cal pin voltage [v] output level [db] ? 0 5 ?.0 1.0 5.0 ?.0 0.0 4.0 2.0 3.0 7.0 6.0 v cc , v ee = +7.0v mode: norm-norm rec cal = open (tape) (speed) 0db = gp cal pin and rec cal pin open ?0db (at 315hz, ?dbv) 315hz 3khz 8khz 12khz
?21 cxa1597m/p supply voltage vs. current consumption v cc ?supply voltage [v] 5678 i cc ?current consumption [ma] 10 11 12 13
?22 cxa1597m/p package outline unit: mm cxa1597m cxa1597p package structure package material lead treatment lead material package weight sony code eiaj code jedec code sop-16p-l01 * sop016-p-0300-a copper alloy solder plating epoxy resin 16pin sop (plastic) 300mil 9.9 ?0.1 + 0.4 16 9 18 1.27 0.45 0.1 5.3 ?0.1 + 0.3 7.9 0.4 6.9 1.85 ?0.15 + 0.4 0.5 0.2 0.2 ?0.05 + 0.1 0.1 ?0.05 + 0.2 0.2g 0.15 m 0.12 package structure package material lead treatment lead material package weight epoxy resin solder plating copper 19.2 ?0.1 + 0.4 9 18 2.54 0.5 0.1 1.2 0.15 3.0 min 0.5 min 3.7 ?0.1 + 0.4 6.4 ?0.1 + 0.3 7.62 0.25 ?0.05 + 0.1 0?to 15 16 16pin dip (plastic) 300mil 1.0 g sony code eiaj code jedec code dip-16p-01 * dip016-p-0300-a similar to mo-001-ae

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