Datasheet

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.

SSOP-16
FEATURES
* Direct Drive PIN Diode and Multiplexer IC
* High Supply Voltage

ORDERING INFORMATION
Ordering Number
L8312G-R16-R
L8312G-R16-R

Package
SSOP-16
(1)Packing Type
(1) R: Tape Reel
(2)Package Type
(2) R16: SSOP-16
(3)Green Package
(3) G: Halogen Free and Lead Free
Packing
Tape Reel
MARKING
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Copyright © 2015 Unisonic Technologies Co., Ltd
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Preliminary

PIN CONFIGURATION

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
LINEAR INTEGRATED CIRCUIT
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
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L8312

Preliminary
LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
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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
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
MIN
5
TYP
MAX UNIT
9
V
10
mA
VCC-1.0 VCC-0.9 VCC
V
0
0.3
0.5
100
1.0
100
170
7.5
130
350
200
mVPP
KHZ
μA
14.0
14.5
15.0
V
100
ms
1.5
V
0.7
1.2
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
Preliminary
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
1M
(Note 1)
0.1u
(Note 2)
VCC
S2A
S1A
S2B
S1B
S2C
S1C
S2D
S1D
VCC
GND
CENB2
1k
CENB1
10n
10n
FIN2
1k
POL2
FIN1
1k
1k
POL1
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
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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
≤0.7V
≥1.2V
≥1.2V
≥1.2V
≥1.2V
≥1.2V
CENB2
≤0.7V
≥1.2V
≥1.2V
≥1.2V
≥1.2V
≥1.2V
Tone
VPOL
Off
Off
On
On
<9.5V
≤14V
≥15.5V
≤14V
≥15.5V
Tone
VPOL
Off
Off
On
On
<9.5V
≤14V
≥15.5V
≤14V
≥15.5V
S1A
Low
Low
High
Low
Low
Low
S1B
Low
Low
Low
High
Low
Low
S1C
Low
Low
Low
Low
High
Low
S1D
Low
Low
Low
Low
Low
High
S2A
Low
Low
High
Low
Low
Low
S2B
Low
Low
Low
High
Low
Low
S2C
Low
Low
Low
Low
High
Low
S2D
Low
Low
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.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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