L8312 UTC | Alldatasheet
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UNISONIC TECHNOLOGIES CO., LTD L8312 Preliminary LINEAR INTEGRATED CIRCUIT w w w . u n i s o n i c . c o m . t w 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 Q W - R 1 2 3 - 0 1 6 . 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 ENB2 Channel 2 Enable
7 F IN2 Channel 2 22KHz Tone Input Pin
8 P OL2 Channel 2 Polarization Input Pin
9 P OL1 Channel 1 Polarization Input Pin
10 F IN1 Channel 1 22KHz Tone Input Pin
11 C ENB1 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 Q W - R 1 2 3 - 0 1 6 . a BLOCK DIAGRAM
L8312 Preliminary LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 4 of 6 www.unisonic.com.tw Q W - R 1 2 3 - 0 1 6 . a ABSOLUTE MAXIMUM RATING (TA=-25 ~ +85°C) PARAMETER SYMBOL RATINGS UNIT Supply Voltage V S -0.6 ~ 12 V Supply Current I S 100 mA Input Voltage (POL Pin) V IN 25 V Power Dissipation (T A=25°C) 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 operation is not implied. ELECTRICAL CHARACTERISTICS (VCC=5V, TA=25°C, unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Supply Voltage (TOPR = -40°C ~ 80°C) V CC 7 9 V Supply Current I CC Standby current, no load 10 mA Output Voltage High SW HIGH I SW =-5mA VCC-1.0 V CC-0.9 VCC 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 POL1, 2 input=25V, via RPOL=1KΩ 100 130 200 μA Polarity Detector Threshold Voltage V TPOL VPOL1, 2 input applied via RPOL=1KΩ 14.0 14.5 15.0 V Switching Speed T S VPOL1, 2 input applied via RPOL=1KΩ 100 ms Enable Threshold Voltage V ENB I CENB =-50μA 0.7 1.2 1.5 V
L8312 Preliminary LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 5 of 6 www.unisonic.com.tw Q W - R 1 2 3 - 0 1 6 . a TYPICAL APPLICATION CIRCUIT 0.1u(Note 3) 1k10n 10n1k VCC 0.1u (Note 2) (Note 1) S2A S2B S2C S2D S1A S1B S1C S1D GNDVCC CENB1CENB2 FIN1FIN2 POL2 POL1 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 0.1u(Note 3)
L8312 Preliminary LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 6 of 6 www.unisonic.com.tw Q W - R 1 2 3 - 0 1 6 . a 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 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 CENB2 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.