unisonic technologies co., ltd ULA1145 preliminary cmos ic www.unisonic.com.tw 1 of 10 copyright ? 2015 unisonic technologies co., ltd qw-r106-006.a fm tuner if system ? description the utc ULA1145 is a high integrated ic for fm tuner if stage, special in car radio. ? features * built-in if count buffer circuit and microprocessor-controlled switch circuit for etr * high s/n * wide range output * more simplifies design: - built-in sd circuit?regulable sensitivity independently of soft mute characteristics - variable s-meter gradient?output with three pins ? ordering information ordering number package packing ULA1145g-n20-r htssop-20 tape reel ? marking
ULA1145 preliminary cmos ic unisonic technologies co., ltd 2 of 10 www.unisonic.com.tw qw-r106-006.a ? pin configuration 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 nc nc ? pin description pin no. pin name description 1, 20 nc 2 if in if input 3 if bias if amp bias 4 if gnd if amp gnd 5 msc mute start control 6 m gc mute gradient control 7 m ac mute attenuation control 8 af out af output 9 afc out afc output 10 if out if output 11 q in quadrature detection input 12 v reg voltage regulator output 13 vcc v cc 14 if ct if count output, control 15 gnd gnd for detection circuit 16 m dri mute driver 17 s out s-meter output 18 sd ct sd sensitivity control 19 sd out sd output
ULA1145 preliminary cmos ic unisonic technologies co., ltd 3 of 10 www.unisonic.com.tw qw-r106-006.a ? pin functions pin no. function internal equivalent circuit notes 2 if input 2 3 bias pin 4 gnd if limiting amp gnd 5 soft mute start point control 5 for setting the soft mute starting point. 6 soft muting gradient control pin 6 can be used for s-meter output. for setting the mute gradient from the soft mute starting point to the noise finishing point. 7 mute att 7 for setting amount of mute attenuation. the demodulation level changes when the external resistance value is varied. 8 fm-af output 9 afc input
ULA1145 preliminary cmos ic unisonic technologies co., ltd 4 of 10 www.unisonic.com.tw qw-r106-006.a ? pin functions(cont.) pin no. function internal equivalent circuit notes 10 if output output to the phase circuit 11 if input if input via the phase shift circuit. the mute circuit malfunctions and demodulation output decreases if the voltage level at this pin drops below 180mv. 12 vref 4.8v 13 v cc supply voltage 7.5~14v 14 if buffer output 15 gnd 16 mute driver amount of mute attenuation depends on and is controlled by the voltage at this pin. 17 s-meter output pnp open collector output 18 sd sensitivity setting can be used for s-meter output 19 sd output high active
ULA1145 preliminary cmos ic unisonic technologies co., ltd 5 of 10 www.unisonic.com.tw qw-r106-006.a ? block diagram
ULA1145 preliminary cmos ic unisonic technologies co., ltd 6 of 10 www.unisonic.com.tw qw-r106-006.a ? absolute maximum rating (t a =25c) parameter symbol ratings unit maximum supply voltage pin 13 v cc 14 v maximum supply current pin 13 i cc 45 ma t a =70c, mounted on pc board 630 mw t a =25c, mounted on pc board, independent ic 630 mw allowable power dissipation t a =70c, independent ic p d 360 mw operating temperature t opr -20~+70 c storage temperature t stg -40~+125 c note: absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. ? operating conditions (t a =25c) parameter symbol ratings unit recommended supply voltage v cc 8 v operating voltage range v cc op 7.5~14 v ? electrical characteristics (t a =25c, v cc =8v, fin=10.7mhz) parameter symbol test conditions min typ max unit quiescent current i cco v in =0db 18 26 36 ma current drain i cc v in =100db 20 29 40 ma demodulation output v o v in =100db , 400hz tone, 100% 300 400 520 mvrms total harmonic distortion thd v in =100db , 400hz tone, 100%, single tuning coil 0.3 0.8 % signal-to-noise ratio s/n vin=100db , 400hz tone, 100% 75 85 db input limiting voltage v in (lim) 400hz tone, 100%, soft mute on 34 40 46 db muting sensitivity v in (mute) v16=2v 30 36 42 db muting bandwidth b w(mute ) v in =100db , v19 0.3v 140 190 280 khz mute(1) v in =100db , v16=2v, 400hz tone, 100% 10 15 20 db muting attenuation mute(2) v in =100db , v16=4v, 400hz tone, 100% 25 29 33 db v 17-0 v in =0db , r16=10k ? , pin 17 0 0.1 0.6 v v 17-50 v in =50db , r16=10k ? , pin 17 1.4 2.3 3.2 v v 17-70 v in =70db , r16=10k ? , pin 17 2.5 4.5 5.5 v signal strength indication output v 17-100 v in =100db , r16=10k ? , pin 17 5.0 5.5 6.0 v v 16-0 v in =0db , pin 16 4.0 4.8 5.5 v muting drive output v 16-100 v in =100db , pin 16 0 0 0.3 db am rejection ratio amr v in =100db , 1khz tone, 30% am 57 70 db v 8-12 v in =0db , pins 8 to 12 -0.25 0 +0.25 v offset voltage v 9-12 v in =0db , pins 9 to 12 -0.5 0 +0.5 v sd sensitivity v sd pin 19 50 58 66 db v if-on v in =100db , pin 14, c l =10pf 110 180 280 mvrms if count output level v if-off v in =100db , pin 14, c l =10pf 1 3 mvrms
ULA1145 preliminary cmos ic unisonic technologies co., ltd 7 of 10 www.unisonic.com.tw qw-r106-006.a ? sd output circuit 1. hole detector signal meter bandmute comparator 18 exhibit hysteresis mute driver 19 sd output 16 as shown, the sd output is the logical and of the band mute and s-meter comparator outputs. 2. signal search using the sd output circuit 2-1 the transition response characterist ics of the sd output circuit depends on t he time constants of pins 16, 17, 18 and 9. as the sd output transition response characteristics are determined by the pin with the largest time constant, erroneous stopping will result when a sear ch time is less than the largest one. 2-2 band mute range circuit time constant (pin 9) an equivalent circuit to the band circuit is shown below. 9 12 c r afc v ref mute switch circuit
ULA1145 preliminary cmos ic unisonic technologies co., ltd 8 of 10 www.unisonic.com.tw qw-r106-006.a ? sd output circuit(cont.) (1) current path during detuning c 12 9 12 9 c r afc r afc (2) current return path from detuning 9 c r afc 12 i=0 as can be seen from the above circuit diagrams, the time constant during detuning is determined by the internal pnp resistance, the npn collector resi stance and the capacitance of the extern ally-mounted capacitor. this time constant is determined by the exte rnal resistance rafc and capacitor c. this time constant, = rafcc, must be set depending on the required search time. 3. narrow-band sd output circuit an if count circuit is provided for equipment compatibil ity for the european marketplac e. however, if the band is made narrow using only the sd circuit, there is a tendency for the number of e rroneous stops caused by an undesired signal to increase. to prevent this, two thresh old voltages should be used to control the sd circuit.
ULA1145 preliminary cmos ic unisonic technologies co., ltd 9 of 10 www.unisonic.com.tw qw-r106-006.a ? soft mute characteristics 1. control the s/n setting (c/n) for weak inputs and the -3db limiting sensitivity can be controlled by obtaining the proper value for the un-soft muted input/output si gnal characteristic. however, usable s ensitivity cannot be controlled as this is determined by the front end and if design which are unrelated to soft muting. 2. soft mute setting soft mute operation depends on the s-meter circuit voltage and the hole detection circuit voltage. as shown in the graph on the right, the degree of soft muting correlates with the mute drive voltage, v1 5. the control signal line of the mute drive voltage swit ches before and after the 10db ant divergence point. when adjusting the soft mute with a weak signal which does not affect the s-meter, first adjust it using the hole detection input signal. however, as t he s-meter output will readjust the soft mu te level, also adjust the soft mute using the s-meter output. at this point, the hole detection output adjusts the gain up to the if input, causing a variance. also, the s-meter output is varied by the value of r16. hole detector s-meter (adjust r4, r5) ant input level (db) mute drive voltage v 15 (mute attenuation) 3. soft mute transition response characteristic the degree of soft muting automatically varies accordin g to the change in input fi eld strength. omitting the influence of the front end wideband agc circuit, the utc ULA1145 ?s response speed is dependent on the time constant at pins 16 and 17.
ULA1145 preliminary cmos ic unisonic technologies co., ltd 10 of 10 www.unisonic.com.tw qw-r106-006.a ? typical application circuit utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
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