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SM6661A seiko npc corporation ? post-ampli?r for gyroscope overview the SM6661A is a post-ampli?r for use in combination with gyroscope ics. the SM6661A has a built-in 2- system post-ampli?r, so that it can amplify two output signals of gyroscope ic with a single SM6661A. it features a simple method to change the different image stabilizing gain and frequency characteristics depending on the models. it also has a built-in sleep function making it easy to connect the output signal of gyroscope ic to a/d converter. features supply voltage range: 3.0 to 3.6v operating ambient temperature range: ? 20 to +80 c 2-system input and output (reverse phase output) corresponds to 2-axis of gyroscope output adjustable output gain and frequency characteris- tics by external components output gain: 30 to 50db (variable ampli?ation control) zero-rate voltage compensation function for sim- ple interface to a/d converter connected to subse- quent stage sleep function built-in small package: 16-pin qfn applications dvc dsc ordering information pinout (top view) package dimensions (unit: mm) weight: 9mg device package SM6661Ab 16-pin qfn hpf1 vcc vref_in1 vsig_in1 vsig_out2 gain2 hpf2 gnd gain1 vsig_out1 sleep vcc gnd vcc/2 vref_in2 vsig_in2 2.50 0.05 1.30 0.05 1.30 0.05 2.50 0.05 11 16 16 0.05 top view bottom view 0.40 0.40 0.60 max 0.40 0.05 0.325 0.05 m 0.05 0.18 0.05 0.08 0.05 c0.05
SM6661A seiko npc corporation ? block diagram pin description number name i/o *1 *1. i: input, ip: input with built-in pull-up resistor, o: output type *2 *2. a: analog, d: digital description 1 hpf1 o a 30db ampli?r output pin 1 2 vcc supply pin 3 vref_in1 i a gyroscope ic reference voltage input pin 1 4 vsig_in1 i a gyroscope ic signal input pin 1 5 gnd ground pin 6 vcc/2 o a reference voltage pin note. connect smoothing capacitors. 7 vref_in2 i a gyroscope ic reference voltage input pin 2 8 vsig_in2 i a gyroscope ic signal input pin 2 9 gnd ground pin 10 hpf2 o a 30db ampli?r output pin 2 11 gain2 i a variable gain ampli?r input pin 2 12 vsig_out2 o a signal output pin 2 13 vcc supply pin 14 sleep ip d sleep mode control pin with built-in pull-up resistor high: sleep mode, low: normal operation 15 vsig_out1 o a signal output pin 1 16 gain1 i a variable gain ampli?r input pin 1 vcc/2 amp 30db vsig_in1 vref_in1 sleep amp 0 to 20db vsig_out1 vcc gain1 hpf1 gnd ref vsig_in2 vref_in2 vsig_out2 gain2 hpf2 gnd vcc + ? amp 30db + ? + ? amp 0 to 20db + ?
SM6661A seiko npc corporation ? pin equivalent circuits number name i/o *1 equivalent circuit 3 4 7 8 vref_in1 vsig_in1 vref_in2 vsig_in2 i 1 10 hpf1 hpf2 o 12 15 vsig_out2 vsig_out1 o 11 16 gain2 gain1 i vsig_in1 vsig_in2 1k ? 5.6k ? vref_in1 vref_in2 1k ? 5.6k ? hpf1 hpf2 vsig_out1 vsig_out2 gain1 gain2 500 ?
SM6661A seiko npc corporation ? note. resistance values indicate design values. 6 vcc/2 o 14 sleep ip *1. i: input, ip: input with built-in pull-up resistor, o: output number name i/o *1 equivalent circuit vcc/2 sleep 200 ? 100k ?
SM6661A seiko npc corporation ? specifications absolute maximum ratings gnd = 0v recommended operating conditions gnd = 0v parameter pin symbol rating unit supply voltage vcc v cc 5.0 v input voltage vref_in1, vref_in2, vsig_in1, vsig_in2, hpf1, hpf2, gain1, gain2, sleep v in v cc + 0.3 to gnd ?0.3 v storage temperature range t stg ? 40 to +125 c power dissipation *1 *1. when mounted on a npcs standard board (76.2mm 114.3mm, 1.6mm thickness, fr-4 glass-epoxy board). thermal resistance ja = 64 c/w p d 0.7 w junction temperature t jmax +125 c parameter pin symbol rating unit min typ max supply voltage vcc v cc 3.0 3.3 3.6 v sleep pin applied voltage sleep v sleep 0v cc v operating ambient temperature ta ?0 25 80 c reference input voltage vref_in1, vref_in2, vsig_in1, vsig_in2 v ref_in 1.25 1.35 2.10 v signal input amplitude *1 *1. when v cc = 3.0v, 30db output gain setting vsig_in1, vsig_in2 v sig_in_ac 47 mvpp output gain variable range vsig_out1, vsig_out2 g range 30?0db variable gain ampli?r feedback resistance r 2 27 330 k ? output load resistance vsig_out1, vsig_out2 r l 50 k ?
SM6661A seiko npc corporation ? electrical characteristics dc characteristics v cc = 3.3v, gnd = 0v, ta = 25 c, circuit constant is same as ?ypical application circuit? unless otherwise noted. ac characteristics v cc = 3.3v, gnd = 0v, ta = 25 c, circuit constant is same as ?ypical application circuit? unless otherwise noted. parameter symbol condition rating unit min typ max current consumption 1 i cc1 sleep = low, v cc = 3.3v ? 5.5 7.5 ma sleep = low, v cc = 3.6v 7.0 9.0 ma current consumption 2 i cc2 sleep = high (sleep mode) ? 1.0 a high-level input voltage v ih sleep pin, v cc = 3.0 to 3.6v, ta = ?0 to +80 c 2.0 v low-level input voltage v il 0.8 v high-level input leakage current *1 *1. sink current is de?ed as positive value. i lh sleep pin, 3.3v input voltage 1.0 a low-level input current *1 i ll sleep pin, 0.0v input voltage ? 38 ? 33 ? 28 a input current (sleep = high) *1 i leak vsig_in1, vsig_in2, vref_in1, vref_in2 pins 0.1 ma input current (sleep = low) *1 i in vsig_in1, vsig_in2, vref_in1, vref_in2 pins, 1.35v input voltage ?.2 ?.045 +0 ma high-level output voltage v oh vsig_out1, vsig_out2 pins, r l = 100k ? v cc ?.3 v cc ?.1 v low-level output voltage v ol 0.1 0.3 v offset voltage *2 *2. r 1 and r 2 indicate the values of input resistor and feedback resistor for variable gain ampli?r respectively. refer to ?ypical applica tion circuit? v offset vsig_out1, vsig_out2 pins, potential difference from vcc/2 pin, r 1 = 150k ? , r 2 = 330k ? 5 20 mv vcc/2 pin voltage v vcc/2 vcc/2 pin v cc /2?.1 v cc /2 v cc /2+0.1 v parameter symbol condition rating unit min typ max 30db ampli?r output gain gain1 hpf1, hpf2 pins 29 30 31 db output gain *1 *1. as for these parameters, the characteristics are determined by external components, and the speci?ations are guaranteed by design and character- istics evaluation. the rating values are shown without considering variability of external components. gain2 vsig_out1, vsig_out2 pins, 35.7 36.8 37.9 db input referred voltage noise *2 *2. input referred voltage noise is a design value when short-circuiting between vsig_in1 and vref_in1 pins, vsig_in2 and vref_in2 pins, without inputting external signal. v noise at 1hz 0.05 v rms / hz lower cutoff frequency *1*3 *3. r 1 and c 1 indicate the values of input resistor and input capacitor for variable gain ampli?r respectively. refer to ?ypical applicati on circuit? f cl r 1 = 150k ? , c 1 = 22 f 0.05 hz upper cutoff frequency *1*4 *4. r 2 and c 2 indicate the values of feedback resistor and feedback capacitor for variable gain ampli?r respectively. refer to ?ypical app lication circuit? f ch r 2 = 330k ?, c 2 = 2200pf 219 hz
SM6661A seiko npc corporation ? functional description sensor signal input and output the signal output of gyroscope ic is connected to vsig_in1 pin. the ?st stage ampli?r of SM6661A is dif- ferential input, so that vref_in1 pin is input zero-rate voltage of gyroscope ic. (normally, the reference voltage output pin of gyroscope ic should be connected to vref_in1 pin.) the ampli?d signal is output from vsig_out1 pin. note that the output signal is reverse phase of input sig- nal from vsig_in1 pin. the zero-rate voltage of output signal is v cc /2v. the description of vsig_in2, vref_in2 and vsig_out2 pins are the same as above vsig_in1, vref_in1 and vsig_out1 pins. vcc/2 pin the vcc/2 pin is a reference voltage pin. smoothing capacitors should be connected between vcc/2 pin and gnd. the recommended values of smoothing capacitors are parallel-connected 10 f electrolytic capacitor and 0.1 f ceramic capacitor. output gain and frequency characteristics setting the output gain and frequency characteristics of SM6661A are adjustable with connecting external resistors and capacitors as shown below. output gain setting the output gain of SM6661A is adjustable by changing the value of external resistors r 1 and r 2 . the SM6661A has a built-in 30db ampli?r, so that the output gain ?ain2?is determined by the formula below; vsig_out1 vsig_out2 gain1 gain2 hpf1 hpf2 r 1 c 1 r 2 c 2 amp 30db amp 0 to 20db + ? + ? gain2 = 20 log ( ) + 30 [db] r 2 r 1
SM6661A seiko npc corporation ? frequency characteristics setting the frequency characteristics of SM6661A is adjustable by changing the value of external capacitors c 1 and c 2 . the lower cutoff frequency f cl and upper cutoff frequency f ch are determined by the formula below; (these values should be set to meet the condition f cl < f ch , in order to construct the band-pass lter.) external components setting the values of r 1 and c 1 should be set considering the time constant ( ) that is determined by the formula below; the r 2 resistor value is determined by r 1 resistor value and output gain setting. note that the offset voltage increases as the r 2 value increases. the r 2 recommended value is 27k ? to 330k?. sleep mode function the SM6661A has the sleep mode function. when sleep pin set to high, the SM6661A operation becomes sleep mode. in sleep mode operation, the current consumption becomes up to 1.0 a and vsig_out1 and vsig_out2 pins are setting high-impedance. control pin SM6661A operation sleep low normal operation high sleep mode f cl = [hz] 1 (2 r 1 c 1 ) f ch = [hz] 1 (2 r 2 c 2 ) = r 1 c 1 [s]
SM6661A seiko npc corporation ? typical application circuit total gain 36.8db f cl 0.05hz f ch 219hz vcc/2 vsig_in1 vref_in1 sleep vsig_out1 0.1 f vcc gain1 hpf1 gnd 10 f + ref a/d converter 1 0.1 f 22 f + vsig_in2 vref_in2 vsig_out2 gain2 hpf2 gnd 0.1 f 22 f vcc + r 1 150k ? c 1 22 f r 2 330k ? v cc /2 amplified signal a/d converter 2 v cc /2 amplified signal sensor 2 v ref_in sensor signal v ref_in reference voltage sensor 1 v ref_in sensor signal v ref_in reference voltage r 1 150k ? c 1 22 f r 2 330k ? c 2 2200pf amp 30db + ? + ? amp 30db + ? c 2 2200pf amp + ? amp
SM6661A seiko npc corporation ?0 typical performances v cc = 3.3v, gnd = 0v, ta = 25c, circuit constant is same as typical application circuit , unless otherwise noted. figure 1. current consumption 1 vs. supply voltage 2.7 3.0 v cc [v] 3.3 3.6 3.9 0 2 4 6 8 i cc1 [ma] figure 2. current consumption 1 vs. ambient temperature 020 ta [ c] ?20 40 ?40 60 80 100 0 2 4 6 8 i cc1 [ma] figure 3. input current vs. supply voltage 2.7 3.0 v cc [v] 3.3 3.6 3.9 ?100 ?80 ?60 ?40 ?20 0 i in [a] vref_in1/ vref_in2 vsig_in1/ vsig_in2
SM6661A seiko npc corporation ?1 *1. each setting is measured without connecting feedback capacitor c 2 for variable gain ampli?r, high-frequency bandwidth is not limited. output gain setting of each characteristics are shown below; [a]: 50.0 db setting (r 1 = 33k ?, r 2 = 330k ?) [b]: 36.8 db setting (r 1 = 150k ?, r 2 = 330k ?) [c]: 30.0 db setting (r 1 = 330k ?, r 2 = 330k ?) figure 4. output gain vs. frequency 25 30 35 40 gain2 [db] 10.10.01 10 frequency [hz] 100 1000 figure 5. output gain vs. ambient temperature (at 10hz input frequency) 0 35.0 36.0 37.0 38.0 39.0 20 ta [ c] gain2 [db] ?20 40 ?40 60 80 100 figure 6. output gain vs. frequency (when changing output gain setting *1 ) 20 30 40 60 50 gain2 [db] 1 0.1 0.01 10 frequency [hz] 100 [a] [b] [c]
SM6661A seiko npc corporation ?2 *1. i s indicates the source current of vsig_out1 or vsig_out2 pins. *2. when short-circuiting between vsig_in1 and vref_in1 pins, vsig_in2 and vref_in2 pins, without inputting external signal. measurement equipment: agilent 35670a fft dynamic signal analyzer, in ?ft analysis mode input referred voltage noise at 1hz frequency: 0.05 vrms/ hz (calculated based on 35 vrms/ hz output noise at 1hz frequency and 36.8 db output gain ?ain2? *3. when measured without connecting feedback capacitor c 2 for variable gain ampli?r, high-frequency bandwidth is not limited. figure 7. output current vs. output voltage *1 (vsig_out1, vsig_out2 pins) 0 100 i s [a] 200 300 400 500 1.645 1.650 1.655 v out [v] output impedance ?v out /?i s = 3? ?i s ?v out figure 8. output noise vs. frequency *2 10.1 0.1 1 10 100 1000 0.01 10 frequency [hz] 100 1000 v out [ vrms/hz] figure 9. crosstalk vs. frequency *3 110 frequency [hz] 100 1000 ?120 ? 110 ?100 ?90 ?80 ?70 ?60 crosstalk [db]
SM6661A seiko npc corporation ?3 recommended footprint pattern (unit: mm) 2.90 0.40 2.90 1.30 0.60 0.60 0.18 1.30
SM6661A seiko npc corporation ?4 nc0801ae 2010.03 please pay your attention to the following points at time of using the products shown in this document. 1. the products shown in this document (hereinafter ?roducts? are designed and manufactured to the generally accepted standard s of reliability as expected for use in general electronic and electrical equipment, such as personal equipment, machine tools and measurement equipment. the products are not designed and manufactured to be used in any other special equipment requiring extremely high level of reliability and safety, such as aerospace equipment, nuclear power control equipment, medical equipment , transportation equipment, disaster prevention equipment, security equipment. the products are not designed and manufactured to be used for the apparatus that exerts harmful in?ence on the human lives due to the defects, failure or malfunction of the produc ts. if you wish to use the products in that apparatus, please contact our sales section in advance. in the event that the products are used in such apparatus without our prior approval, we assume no responsibility whatsoever for any damages resulting from the use of that apparatus. 2. npc reserves the right to change the speci?ations of the products in order to improve the characteristics or reliability the reof. 3. the information described in this document is presented only as a guide for using the products. no responsibility is assumed by us for any infringements of patents or other rights of the third parties which may result from its use. no license is granted by implication or otherwise under any patents or other rights of the third parties. then, we assume no responsibility whatsoever for any damages resulting from that infringements. 4. the constant of each circuit shown in this document is described as an example, and it is not guaranteed about its value of t he mass- production products. 5. in the case of that the products in this document falls under the foreign exchange and foreign trade control law or other app licable laws and regulations, approval of the export to be based on those laws and regulations are necessary. customers are requested appropriately take steps to obtain required permissions or approvals form appropriate government agencies. seiko npc corporation 1-9-9, hatchobori, chuo-ku, tokyo 104-0032, japan telephone: +81-3-5541-6501 facsimile: +81-3-5541-6510 http://www.npc.co.jp/ email: sales @ npc.co.jp

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