unisonic technologies co., ltd l8312 preliminary linear integrated circuit www.unisonic.com.tw 1 of 6 copyright ? 2010 unisonic technologies co., ltd qw-r123-016.a dual polarization and tone switch controller ? description the utc l8312 is specially designed integrated circuit for control satellite receiver front-end block switch and provides customers with dual independent channel of two-control signal: polarization and tone switch controller for lnb switch signal path selection. the utc l8312 is characterized by its two independent channels and each provides logical outputs to show status of lnb switch polarization selection and 22 khz tone signal. minimum number of external discrete components and the wide range of supply voltage make this device suitable in twin, quad and multiple feed universal lnb switch to get lower cost and minimum pcb size. in order to satisfy the special lnb switch model, a tighter specification has been taken into consideration for the polarization switch characteristics. the number of external components is also reduced. the utc l8312 includes separate 22k tone detection for each channel. in addition, the bu ilt-in tone amplifier circuit is designed to protect transient signal by an external resistor and capacitor simply, and it also provides good bandwidth and sensitivity. the utc l8312 is generally applied in multi output lnb and multi switch. ? features * direct drive pin diode and multiplexer ic. * high supply voltage ? ordering information ordering number lead free halogen free package packing l8312l-r16-r L8312G-R16-R ssop-16 tape reel
l8312 preliminary linear integrated circuit unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r123-016.a ? pin configuration ? pin description pin no. pin name description 1 s2a channel 2 switch output a 2 s2b channel 2 switch output b 3 s2c channel 2 switch output c 4 s2d channel 2 switch output d 5 v cc supply voltage pin 6 c enb 2 channel 2 enable 7 f in 2 channel 2 22khz tone input pin 8 p ol 2 channel 2 polarization input pin 9 p ol 1 channel 1 polarization input pin 10 f in 1 channel 1 22khz tone input pin 11 c enb 1 channel 1 enable 12 gnd ground pin 13 s1d channel 1 switch output a 14 s1c channel 1 switch output b 15 s1b channel 1 switch output c 16 s1a channel 1 switch output d
l8312 preliminary linear integrated circuit unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r123-016.a ? block diagram
l8312 preliminary linear integrated circuit unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r123-016.a ? absolute maximum rating (t a =-25 ~ +85c) parameter symbol ratings unit supply voltage v s -0.6 ~ 12 v supply current i s 100 ma input voltage (p ol pin) v in 25 v power dissipation (t a =25c) p d 600 mw operating junction temperature t j -40 ~ 70 c storage temperature t stg -50 ~ 85 c note: absolute maximum ratings are those values beyo nd which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. ? electrical characteristics (v cc =5v, t a =25c, unless otherwise specified) parameter symbol test conditions min typ max unit supply voltage (t opr = -40c ~ 80c) v cc 7 9 v supply current i cc standby current, no load 10 ma output voltage high sw high i sw =-5ma v cc -1.0 v cc -0.9 v cc v output voltage low sw low i sw =5ma 0 0.3 0.5 tone/polarity switch characteristics tone switch threshold v tst coupling via 10nf(sin wave) 100 170 350 mv pp low frequency rejection f rl coupling via 10nf(sin wave) 1.0 7.5 kh z polarity detector input current i pol v pol 1, 2 input=25v, via r pol =1k ? 100 130 200 a polarity detector threshold voltage v tpol v pol 1, 2 input applied via r pol =1k ? 14.0 14.5 15.0 v switching speed t s v pol 1, 2 input applied via r pol =1k ? 100 ms enable threshold voltage v enb i cenb =-50 a 0.7 1.2 1.5 v
l8312 preliminary linear integrated circuit unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r123-016.a ? typical application circuit 0.1u(note 3) 1k 1k 10n 1k 10n 1k v cc 0.1u (note 2) 1m (note 1) s2a s2b s2c s2d s1a s1b s1c s1d gnd v cc c enb 1 c enb 2 f in 1 f in 2 p ol 2 p ol 1 v pol & tone 4x1 switch note:1. current limitation resistance 2. required bypass capacit or for noise interference elimination 3. optional bypass capacitor for 22khz tone interf erence elimination 0.1u(note 3)
l8312 preliminary linear integrated circuit unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r123-016.a ? functional information the utc l8312 is specially designed integrated circuit for cont rol satellite receiver front-end block switch, it contains all the circuits necessary to detect the dc voltage and 22khz signal on the supply input to the lnb switch. the tone switch circuit incorporates an operational amplifier used as active f ilter, a rectifier /a comparator and an output driver. built-in feedback resistor included in oper ational amplifier, external component counts are thus minimized. therefore, low pass filter respons e can be achieved with a simple external rc. the gain of operational amplifier must be adjusted with different supply voltage due to the threshold of comparator is supply dependent. to opt imize the system perform ance, the external rc values must be adjusted. the resistor also provides maximum input voltage protection for the p ol 1, 2 pins. the low pass filter of tone detection circuit allows the utc l8312 to reliably detect tone signal. each channel decodes tone polarization signals to activate one of four outputs. each of those outputs has the capability of sinking 5ma and sourcing 5ma, providing the capability of driving directly signal routing pin diodes. in addition, the channel outputs would activate when pins voltage of c enb 1, 2 set high, which means, c enb 1, 2 pins input signal have priority over tone polari zation signals to control channel outputs. table 1 shows the logical output truth table. table1 c enb 1 tone v pol s1a s1b s1c s1d 0.7v low low low low 1.2v <9.5v low low low low 1.2v off 14v high low low low 1.2v off 15.5v low high low low 1.2v on 14v low low high low 1.2v on 15.5v low low low high c enb 2 tone v pol s2a s2b s2c s2d 0.7v low low low low 1.2v <9.5v low low low low 1.2v off 14v high low low low 1.2v off 15.5v low high low low 1.2v on 14v low low high low 1.2v on 15.5v low low low high 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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