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technical note audio accessory ic series band-pass filter for spectrum analyzer indication ba3835f, ba3830f, ba3834f z description as ba3835f, ba3830f, and ba3834f contain band pass filters for spectrum analyzer, external mount parts can be significantly reduced enabling compact unit size and high reliability. z features 1) built-in band pass filter for spectrum analyzer. ba 3835f has 5 bands filters, ba 3830f has 6 bands filters, and ba3834f has 7 bands filters. 2) ba3834f and ba3835 have an integrated multiplexer circuit. c ontrolled by a microcontroller, detection level is serially output with dc level. 3) ba3830f output for recording indicator. detection level is parallel output in dc. 4) support 5v microcomputer bus 5) sop18 package with few external parts z applications car audio, mini audio stereo systems, and cd radio cassette players. z product lineup item ba3835f ba3830f ba3834f number of band 5 6 7 center frequency of the band pass filter (hz) 105,340,1k,3.4k,10.5k 63, 150,330,1k,3.3k,10k 68,170,420,1k,2.4k, 5.9k,14.4k power voltage v 4.5 6.5 4.5 8 4.5 6.5 output type serial output parallel output serial output working temperature range -25 ~ +75 -25 ~ +75 -25 ~ +75 package sop18 sop18 sop18 ver.b oct.2005
2/16 z absolute maximum ratings (ta = 25 c) parameter symbol limits unit ba3834f,ba3835f 7 power supply voltage ba3830f vcc 9 v power dissipation pd 450* mw operating temperature topr -25 +75 storage temperature tstg -55 +125 reduced by 4.5 mw/ c over 25 c z recommended operating conditions (ta = 25 c) parameter symbol min. typ. max. unit ba3834f,ba3835f 4.5 5.0 6.5 power supply voltage ba3830f vcc 4.5 D 8.0 v z electrical characteristics ba3835f (unless otherwise noted, ta 25 v cc 5v r l 10m ,v ain 30dbv sel 1) *1 the time from the rise of a, b, c or sel until the rise of aout (90% of peak). if the output selection time is less than th is, the output value is not guaranteed an d the reset pulse is not generated. *2 automatically generated intemally based on the output select signal. fo r the duration that this signa l is ?h?, a resistor i s connected to the peak hold capacitor, and the out put level drops by -3db (typ.) for one pluse, *3 the q of the bandpass filter is 3.5. not designed for radiation resistance. parameter symbol min. typ. max. unit conditions circuit current i cc 8.5 13 ma v ain = 0v, a, b, c, sel = 0 maximum output level v om 4.0 4.8 v v ain = -14dbv, measured at each output output offset voltage v os 30 150 mv v ain = 0v, sel = 0/1 measured at each output (cycle time : ts=50ms) standard output level 1 v 01 0.65 1.35 1.70 v f in =105hz, a=0, b=0, c=1 standard output level 2 v 02 0.65 1.35 1.70 v f in =340hz, a=0, b=1, c=0 standard output level 3 v 03 0.65 1.35 1.70 v f in =1khz, a=1, b=0, c=0 standard output level 4 v 04 0.65 1.35 1.70 v f in =3.4khz, a=1, b=1, c=0 standard output level 5 v 05 0.65 1.35 1.70 v f in =10.5khz, a=1, b=1, c=1 input impedance r in 80 100 120 f in =1khz common-mode rejection ratio cmrr 25 50 db f in =1khz, v ain =v cin logic input high level v ih 2.5 5.0 v logic input low level v il 0 0.5 v not applicable in the when item 3 of the operation notes applies. output response time* 1 t o 5 10 s discharge level dl 3 db reset pulse within t r =10 s (typ.)* 2
3/16 ba3830f (unless otherwise noted, ta 25 v cc 5v r l 10m , r 1 270k , r 2 270k ? q is set to 4.5. not designed for radiation resistance. ba3834f (unless otherwise noted, ta 25 v cc 5v r l 10m ,v ain -30dbv sel 1) *1 the time from the rise of a, b, c or sel until the rise of aout (90% of peak). if the out put selection time is less than th is, the output value is not guaranteed an d the reset pulse is not generated. *2 automatically generated intemally based on the output select signal. fo r the duration that this signa l is ?h?, a resistor i s connected to the peak hold capacitor, and the output level drops by -3db (typ.) for one pulse, *3 the q of the bandpass filter is 3.5 for f 01 to f 06 , and 2.5 for f 07 . not designed for radiation resistance. parameter symbol min. typ. max. unit conditions quiescent current i o 3.8 5.2 ma reference output level (level) v ol -3 0 3 db v in = -30dbv, v o = 1.5v (0db) when f = center frequencies is input max. output level (level) v olmax 3.2 4.2 v v in = -14dbv, when f = center frequencies is input reference output level (rec level) v or -3 0 3 db v in = -30dbv, v o = 1.5v (0db) f = 1khz max. output level (rec level) v olmax 3.8 4.8 v v in = -14dbv, f = 1khz output offset voltage v off 30 90 mv with no signal center frequency 1 f 01 49 63 77 hz v in = -30dbv center frequency 2 f 02 117 150 183 hz v in = -30dbv center frequency 3 f 03 257 330 403 hz v in = -30dbv center frequency 4 f 04 0.78 1 1.22 khz v in = -30dbv center frequency 5 f 05 2.55 3.3 4.03 khz v in = -30dbv center frequency 6 f 06 7.8 10 12.2 khz v in = -30dbv input current when reset pin is high i in 150 215 280 a v in = 5v input current when reset pin is on v th 1.4 1.8 v input current when reset pin is off v th 1.0 1.4 v parameter symbol min. typ. max. unit conditions circuit current i cc 10 15 ma v ain = 0v, a, b, c, sel=0 maximum output level v om 4.0 4.8 v v ain = -14dbv, measured at each output output offset voltage v os 30 150 mv v ain = 0v, sel=0/1, measured at each output (cycle time : ts=50ms) standard output level 1 v 01 0.65 1.35 1.70 v f in =68hz, a=0, b=0, c=1 standard output level 2 v 02 0.65 1.35 1.70 v f in =170hz, a=0, b=1, c=0 standard output level 3 v 03 0.65 1.35 1.70 v f in =420hz, a=0, b=1, c=1 standard output level 4 v 04 0.65 1.35 1.70 v f in =1khz, a=1, b=0, c=0 standard output level 5 v 05 0.65 1.35 1.70 v f in =2.4khz, a=1, b=0, c=1 standard output level 6 v 06 0.65 1.35 1.70 v f in =5.9khz, a=1, b=1, c=0 standard output level 7 v 07 0.65 1.35 1.70 v f in =14.4khz, a=1, b=1, c=1 input impedance r in 80 100 120 v f in =1khz common-mode rejection ratio cmrr 25 50 db f in =1khz, v ain =v cin logic input high level v ih 2.5 5.0 v logic input low level v il 0 0.5 v not applicable in the when item 3 of the operation notes applies. output response time* 1 t o 5 10 s discharge level dl 3 db reset pulse within t r =10 s (typ.)* 2
4/16 z application example (ba3835f) / 1 18 bias 2 3 4 5 6 7 8 9 17 16 15 10 11 12 13 14 bpf 105hz 340hz 1kh bpf 3.4kh bpf 10.5khz peak hold peak hold peak hold peak hold peak res res res res res dif a _c c a mpx dec vref reference current biasic vref rref n.c difout n.c cin a in vcc gnd a out test n.c sel n.c c b a i/o(a/d) i/o i/o i/o i/o display -com 0. 1f 0. 1f 100k ? gnd a udio system gnd l 56k ? l+r 10k ? r 0.1 f 0.1f +5v g-eq fig.1 di g ital s y stem gnd hold bpf bpf
5/16 z application example (ba3835f) 1 18 bias 2 3 4 5 6 7 8 9 17 16 15 10 11 12 13 14 bpf 170hz 420hz 1kh bpf 2.4kh bpf 5.9khz hold peak hold peak hold peak res res res res res dif a _c c a mpx dec vref reference current biasic vref rref n.c difout n.c cin a in vcc gnd a out test n.c sel n.c c b a i/o(a/d) i/o i/o i/o i/o display -com 0. 1f 0. 1f 100k ? gnd a udio system gnd l 56k ? l+r 10k ? r 0.1 f 0.1f +5v g-eq fig.1 di g ital s y stem gnd peak hold bpf bpf bpf 68hz peak hold res bpf 14.4khz hold peak res hold peak
6/16 z application example ba3830f fig.3
7/16 z electrical characteristics curves fig.4 bpf frequency characteristics ba3835f fig.6 output vs. frequency ba3830f fig.7 input vs. output level ba3830f fig.8 input vs. output level ba3830f rec mode fig.9 bpf frequency characteristics ba3834f fig.10 input level vs. output level ba3834f
8/16 z terminal explanation ba3834f,ba3835f terminal no. terminal name terminal explanation i/o circuit diagram 10 a 11 b 12 c 14 sel output selection control terminal (refer to the output selection logic table) 16 test test signal input terminal must be connect to gnd. 4, 6 13, 15 n.c. terminal not used 5 difout differential amplifier output terminal open for proper use 7 cin differential amplifier input terminal2 connect capacitor to gnd for audio signals. 8 ain differential amplifier input terminal1 input audio signal through coupling capacitor. 17 aout multiplex output terminal select one band out of 5 or 7 bands. peak hold voltage is output. after selection, reset pulse will cause it to attenuate to -3db level
9/16 terminal no. terminal name terminal explanation i/o circuit diagram 3 rref setting of band pass filter connect external adjustments. reference resister to terminal (for band shift only). 2 vrefc for logic voltage decoupling capacitor connection terminal 1 biasc for analog voltage decoupling capacitor connection terminal 9 vcc power supply terminal 18 gnd grounding terminal
10/16 z output select logic table ba3835f sel a b c aout 0 gnd 1 0 0 0 gnd 1 0 0 1 105hz 1 0 1 0 340hz 1 0 1 1 gnd 1 1 0 0 1khz 1 1 0 1 gnd 1 1 1 0 3.4khz 1 1 1 1 10.5khz :don't care z timing chart ba3835f fig.11
11/16 z output select logic table ba3834f :don't care z timing chart ba3834f fig.12 z cautions on use ba3835f (1) numbers and data in entries numbers and data in entries are representative design va lues and are not guaranteed va lues of the items. (2) example application circuit although rohm is confident t hat the example application circuit reflects the best possible recommendations, be sure to verify circuit characteristics for your particular application. modification of constants for other externally connected circui ts may cause variations in both static and transient characteristi cs for external components as well as this rohm ic. allow for sufficient margins when determining circuit constants. (3) absolute maximum ratings use of the ic in excess of absolute maximum ratings, such as the applied voltage or oper ating temperature range (topr), may result in ic damage. assumptions should not be made regarding the state of the ic (short mode or open mode) when such damage is suffered. a physical safety measure, such as a fuse, should be implemented when using the ic at times where the absolute maximum ratings may be exceeded. (4) gnd potential ensure a minimum gnd pin potential in all operating conditions. make sure that no pins are at a voltage below the gnd at any time, regardless of whether it is a transient signal or not. sel a b c aout 0 gnd 1 0 0 0 gnd 1 0 0 1 68hz 1 0 1 0 170hz 1 0 1 1 420hz 1 1 0 0 1khz 1 1 0 1 2.4khz 1 1 1 0 5.9khz 1 1 1 1 14.4khz
12/16 (5) thermal design perform thermal design, in which there ar e adequate margins, by taking into account the power dissipation (pd) in actual states of use. (6) short circuit between terminals and erroneous mounting pay attention to the assembly direction of the ics. wrong mounting direction or shorts between terminals, gnd, or other components on the circuits, can damage the ic. (7) operation in strong electromagnetic field using the ics in a strong electrom agnetic field can cause operation malfunction. (8) frequency characteristics the frequency characteristics of this ic are determined by the resistor connected between the r ref terminal and gnd. for the specification conditions, the value of this resistor is 100k ? . if it is necessary to set the frequency characteristics accurately, use a variable resistor note: all bands will shift together. (9) load characteristics to convert the bias sense output signal to the gnd sense signal, the ic performs a v / i conversion, and then an i /v conversion using a 10k ? resistor (typ.) for the output. the aout can drive a cmos load. (e.g. microprocessor input port) but if it is connected to a circuit with low input impedance, it may cause the output level to drop. (10) external resistor for the control pin when using a common port for t he output select control and fl drive, you must add a diode and resistor as shown in fig. 13 to prevent the fl drive ?l? voltage from damaging the ic. fig.13 in this case, the ?l? voltage applied to the internal comparator input terminal v 1 is given by: to maintain a noise margin of at least 2.5v with respect to the comparator threshold level v ref , the representative values for v ref , r 1 and r 2 are 1.5v, 20k ? , and 10k ? respectively. this gives: and from this, the following condition is obtained: r 30k in this case, the ?l? level voltage v 2 for the ic will be: v 2 0.75v (11) recommended operating ranges provided that the ic is oper ated within the recommended operating conditions and t he recommended temperature range, the basic circuit func tions are guaranteed. within these ranges, ratings for electrical characteristics for conditions other than those sp ec cannot be guaranteed, but the basic function of the band pa ss filter will be maintained. (12) output offset voltage the relationship between the out put offset voltage and the output selection cycle (cycle ti me) for this ic is shown in fig.14. the maximum output offs et voltage of 150mv that is given in the electrical charac teristics table is under the condition that ts = 200ms. when ts is greater than 50ms, the graph of the output offset voltage is a straight line at 150mv. when ts is below 50ms, can be sensitive to transient c haracteristics of the peak hold circuit, the shorter the cycle, the larger the output offset voltage is. furthermore, the out put offset voltage may shift due to soldering or other temp erature stresses. therefore, when setting the spectral analyz er light level, take into consideration the points given above and make sure that the spectral analyzer light does not light up during quiescent periods. use the chart below as a guide and, if necessary, leave an even a larger margin. fig. 14 v 1 = v ref r 1 +r 2 +r r 1 +r 1.5v+0.25v 1.5v 20k +20k +r 20k +r ba3835f
13/16 z cautions on use (ba3834f) (1) numbers and data in entries numbers and data in entries are representative design values and are not guarante ed values of the items. (2) example application circuit although rohm is confident that the example application circuit reflects t he best possible recommendations, be sure to verify circuit characteristics for your particular application. modifi cation of constants for other externally connected circuits may cause variations in both static and transient char acteristics for external components as well as this rohm ic. allow for sufficient m argins when determining circuit constants. (3) absolute maximum ratings use of the ic in excess of absolute maximum ratings, such as the applied voltage or operating temperature range (topr), may result in ic damage. assumptions should not be made regarding the state of the ic (short mode or open mode) when such damage is suffered. a physical safety measure, such as a fu se, should be implemented when usin g the ic at times where the absolute maximum ratings may be exceeded. (4) gnd potential ensure a minimum gnd pin potential in all operating conditions. ma ke sure that no pins are at a voltage below the gnd at any time, regardless of whether it is a transient signal or not. (5) thermal design perform thermal design, in which there are adequate margins, by taking into acco unt the power dissipation (pd) in actual states of use. (6) short circuit between terminals and erroneous mounting pay attention to the assembly direction of the ics. wrong mounting direction or shorts between terminals, gnd, or other compone nts on the circuits, can damage the ic. (7) operation in strong electromagnetic field using the ics in a strong electromagnetic field can cause operation malfunction. (8) frequency characteristics the frequency characteristics of this ic are determined by the resistor connected between the r ref terminal and gnd. for the specification conditions, the value of this resistor is 100k ? . if it is necessary to set the frequency characteristics accurately, use a variable resistor note: all bands will shift together. (9) load characteristics to convert the bias sense output signal to the gnd sense signal, the ic performs a v / i conversion, and then an i /v conversion using a 10k ? resistor (typ.) for the output. the aout can drive a cmos load. (e.g. microprocessor input port) but if it is connected to a circuit with low input impedance, it may cause the output level to drop. (10) external resistor for the control pin when using a common port for the output select control and fl drive, you must add a diode and resistor as shown in fig. 15 to prevent the fl drive ?l? voltage from damaging the ic. fig. 15 in this case, the ?l? voltage applied to the internal comparator input terminal v 1 is given by: to maintain a noise margin of at least 2.5v with respect to the comparator threshold level v ref , the representative values for v ref , r 1 and r 2 are 1.5v, 20k ? , and 10k ? respectively. this gives : and from this, the following condition is obtained :r < 30k ? in this case, the ?l? level vo ltage v2 for the ic will be : v2 < 0.75v (11) recommended operating ranges provided that the ic is oper ated within the recommended operating conditions and t he recommended temperature range, the basic circuit func tions are guaranteed. within these ranges, ratings for electrical characteristics for conditions other than those sp ec cannot be guaranteed, but the basic function of the band pa ss filter will be maintained. (12) output offset voltage the relationship between the out put offset voltage and the output selection cycle (cycle ti me) for this ic is shown in fig.16. the maximum output offs et voltage of 150mv that is given in the electrical charac teristics table is under the condition that ts = 200ms. when ts is greater than 50ms, the graph of the output offset voltage is a straight line at 150mv. when ts is below 50ms, can be sensitive to transient c haracteristics of the peak hold circuit, the shorter the cycle, the larger the output offset voltage is. furthermore, the out put offset voltage may shift due to soldering or other temp erature stresses. therefore, when setting the spectral analyz er light level, take into consideration the points given above and make sure that the spectral analyzer light does not light up during quiescent periods. use the chart below as a guide and, if necessary, leave an even a larger margin. fig.16 1.5v+0.25v 1.5v 20k +20k +r 20k +r v 1 = v ref r 1 +r 2 +r r 1 +r ba3834f
14/16 z circuit operation (ba3830f) (1) line and rec input circuits the line and rec input circuits are configured as differential amplifiers, and the gain can be set to any required value using an external resistor. the input impedance is determined by the external resistor. (2) bias circuit a bias voltage of vcc /2 is applied to each of the circuits. since the output stage uses a push-pull configuration, a stable bias source can be obtained. (3) bpf circuit this is a circuit that se lects the required frequency component from the input signal and amplifies it. with this configuration, no external capacitor is needed. in addition, the center frequency is set based on the current, so f01 and f02 to f06 can be set individually, using separate external resistors (pins1 and 2). q is set to 4.5v (typ.). fig.19 fig.17 fig.18 fig.20
15/16 (4) det circuit this circuit carries out phase detection on the signal selected and amplified by the bpf, and holds it at the peak level. it is configured so that a ll of the capacitors are internal. the charge that was charged by the internal capacitors in the det circuit is set to be discharged at 75ms/v (typ.), but in order to eliminate any effects of disparity, a reset circuit is also included. (5) output section circuit the signal level held at peak level by the det undergoes v/ i conversion and is output. since the next stage supports mos (high-input impedance), there is a resistance of 33.9kw (44.3kw for rec out put only) between the output pin and the gnd in the ic, so the output value changes based on the input impedance. fig.21 fig.22
the contents described herein are correct as of october, 2005 the contents described herein are subject to change without notice. for updates of the latest information, please contact and confirm with rohm co.,ltd. any part of this application note must not be duplicated or copied without our permission. application circuit diagrams and circuit constants contained herein are shown as examples of standard use and operation. p lease pay careful attention to the peripheral conditions when designing circuits and deciding upon circuit constants in the set. any data, including, but not limited to application circuit diagrams and information, described herein are intended only a s illustrations of such devices and not as the specifications for such devices. rohm co.,ltd. disclaims any warranty that any use of such devices shall be free from infringement of any third party's intellectual property rights or other proprietary rights, and further, assumes no liability of whatsoever nature in the event of any such infringement, or arising from or connected with or related to the use of such devices. upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or otherwise dispose o f the same, implied right or license to practice or commercially exploit any intellectual property rights or other proprietary rights owned or controlled by rohm co., ltd. is granted to any such buyer. the products described herein utilize silicon as the main material. the products described herein are not designed to be x ray proof. published by application engineering group catalog no.05t412be '05.10 rohm c 2000 tsu z order model name selection b a 3 8 3 5 f - e 2 ? ???`?? ba3835f ba3830f ba3834f tape quantity direction of feed embossed carrier tape 2000pcs (correct direction: 1pin of product should be at the upper left when you hold reel on the left hand, and you pull out the tape on the right hand) e2 reel 1pin 1234 1234 1234 1234 1234 1234 1234 1234 sop18 (unit:mm) 0.3min. 0.4 0.1 0.11 1.8 0.1 5.4 0.2 7.8 0.3 0.15 0.1 18 1 11.2 0.2 10 9 1.27 0.1 direction of feed orders are available in complete units only. product name packing & foaming specification
notes no technical content pages of this document may be reproduced in any form or transmitted by any means without prior permission of rohm co.,ltd. the contents described herein are subject to change without notice. the specifications for the product described in this document are for reference only. upon actual use, therefore, please request that specifications to be separately delivered. application circuit diagrams and circuit constants contained herein are shown as examples of standard use and operation. please pay careful attention to the peripheral conditions when designing circuits and deciding upon circuit constants in the set. any data, including, but not limited to application circuit diagrams information, described herein are intended only as illustrations of such devices and not as the specifications for such devices. rohm co.,ltd. disclaims any warranty that any use of such devices shall be free from infringement of any third party's intellectual property rights or other proprietary rights, and further, assumes no liability of whatsoever nature in the event of any such infringement, or arising from or connected with or related to the use of such devices. upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or otherwise dispose of the same, no express or implied right or license to practice or commercially exploit any intellectual property rights or other proprietary rights owned or controlled by rohm co., ltd. is granted to any such buyer. products listed in this document are no antiradiation design. appendix1-rev2.0 thank you for your accessing to rohm product informations. more detail product informations and catalogs are available, please contact your nearest sales office. rohm customer support system the americas / europe / asia / japan contact us : webmaster@ rohm.co. jp www.rohm.com copyright ? 2008 rohm co.,ltd. the products listed in this document are designed to be used with ordinary electronic equipment or de vices (such as audio visual equipment, office-automation equipment, communications devices, electrical appliances and electronic toys). should you intend to use these products with equipment or devices which require an extremely high level of reliability and the malfunction of which would directly endanger human life (such as medical instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other safety devices), please be sure to consult with our sales representative in advance. it is our top priority to supply products with the utmost quality and reliability. however, there is always a chance of failure due to unexpected factors. therefore, please take into account the derating characteristics and allow for sufficient safety features, such as extra margin, anti-flammability, and fail-safe measures when designing in order to prevent possible accidents that may result in bodily harm or fire caused by component failure. rohm cannot be held responsible for any damages arising from the use of the products under conditions out of the range of the specifications or due to non-compliance with the notes specified in this catalog. 21 saiin mizosaki- cho, ukyo-ku, kyoto 615-8585, japan tel : +81-75-311-2121 fax : +81-75-315-0172 appendix

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