L8312

UNISONIC TECHNOLOGIES CO., LTD L8312 Preliminary LINEAR INTEGRATED CIRCUIT 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 built-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 L8312L-R16-R L8312G-R16-R Package SSOP-16 Packing Tape Reel www.unisonic.com.tw Copyright © 2010 Unisonic Technologies Co., Ltd 1 of 6 QW-R123-016.a L8312 PIN CONFIGURATION Preliminary LINEAR INTEGRATED CIRCUIT PIN DESCRIPTION PIN NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 PIN NAME S2A S2B S2C S2D VCC CENB2 FIN2 POL2 POL1 FIN1 CENB1 GND S1D S1C S1B S1A DESCRIPTION Channel 2 Switch Output A Channel 2 Switch Output B Channel 2 Switch Output C Channel 2 Switch Output D Supply Voltage Pin Channel 2 Enable Channel 2 22KHz Tone Input Pin Channel 2 Polarization Input Pin Channel 1 Polarization Input Pin Channel 1 22KHz Tone Input Pin Channel 1 Enable Ground Pin Channel 1 Switch Output A Channel 1 Switch Output B Channel 1 Switch Output C Channel 1 Switch Output D UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 6 QW-R123-016.a L8312 BLOCK DIAGRAM Preliminary LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 6 QW-R123-016.a L8312 Preliminary LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATING (TA=-25 ~ +85°C) PARAMETER SYMBOL RATINGS UNIT Supply Voltage VS -0.6 ~ 12 V Supply Current IS 100 mA Input Voltage (POL Pin) VIN 25 V Power Dissipation (TA=25°C) PD 600 mW Operating Junction Temperature TJ -40 ~ 70 °C Storage Temperature TSTG -50 ~ 85 °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 operation is not implied. ELECTRICAL CHARACTERISTICS (VCC=5V, TA=25°C, unless otherwise specified) PARAMETER SYMBOL Supply Voltage (TOPR = -40°C ~ 80°C) VCC Supply Current ICC Output Voltage High SWHIGH Output Voltage Low SWLOW TONE/POLARITY SWITCH CHARACTERISTICS Tone Switch Threshold VTST Low Frequency Rejection fRL Polarity Detector Input Current IPOL Polarity Detector Threshold Voltage Switching Speed Enable Threshold Voltage VTPOL TS VENB TEST CONDITIONS Standby current, no load ISW =-5mA ISW =5mA Coupling via 10nF(sin wave) Coupling via 10nF(sin wave) VPOL1, 2 input=25V, via RPOL=1KΩ VPOL1, 2 input applied via RPOL=1KΩ VPOL1, 2 input applied via RPOL=1KΩ ICENB =-50μA MAX UNIT 9 V 10 mA V VCC-1.0 VCC-0.9 VCC 0 0.3 0.5 100 1.0 100 14.0 170 7.5 130 14.5 350 200 15.0 100 0.7 1.2 1.5 mVPP KHZ μA V ms V MIN 7 TYP UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 6 QW-R123-016.a L8312 Preliminary LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION CIRCUIT 1M (Note 1) 0.1u (Note 2) S2A S2B S2C S2D S1A S1B S1C S1D GND CENB1 10n FIN1 POL1 1k 1k VCC VCC CENB2 1k 1k 10n FIN2 POL2 0.1u(Note 3) 0.1u(Note 3) VPOL& Tone 4X1 Switch Note:1. Current limitation resistance 2. Required BYPASS capacitor for noise interference elimination 3. Optional BYPASS capacitor for 22KHz tone interference elimination UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 6 QW-R123-016.a L8312 Preliminary LINEAR INTEGRATED CIRCUIT FUNCTIONAL INFORMATION The UTC L8312 is specially designed integrated circuit for control 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 filter, a rectifier /a comparator and an output driver. Built-in feedback resistor included in operational amplifier, external component counts are thus minimized. Therefore, low pass filter response 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 optimize the system performance, the external RC values must be adjusted. The resistor also provides maximum input voltage protection for the POL1, 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 CENB1, 2 set high, which means, CENB1, 2 pins input signal have priority over tone polarization signals to control channel outputs. Table 1 shows the logical output truth table. Table1 CENB1 Tone VPOL S1A S1B S1C S1D ≤0.7V Low Low Low Low ≥1.2V