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PDF ( 数据手册 , 数据表 ) ULA1145

零件编号 ULA1145
描述 FM TUNER IF SYSTEM
制造商 Unisonic Technologies
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ULA1145 数据手册, 描述, 功能
UNISONIC TECHNOLOGIES CO., LTD
ULA1145
Preliminary
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
ULA1145G-N20-R
Package
HTSSOP-20
CMOS IC
Packing
Tape Reel
MARKING
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
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ULA1145 pdf, 数据表
ULA1145
SD OUTPUT CIRCUIT(Cont.)
(1) Current path during detuning
12 RAFC
9
Preliminary
12
RAFC
C
CMOS IC
9
C
(2) Current return path from detuning
12
RAFC
9
I=0
C
As can be seen from the above circuit diagrams, the time constant during detuning is determined by the internal
PNP resistance, the NPN collector resistance and the capacitance of the externally-mounted capacitor. This time
constant is determined by the external resistance RAFC and capacitor
C. This time constant, τ = RAFC×C, must be set depending on the required search time.
3. Narrow-band SD output circuit
An IF count circuit is provided for equipment compatibility for the European marketplace. However, if the band is
made narrow using only the SD circuit, there is a tendency for the number of erroneous stops caused by an
undesired signal to increase. To prevent this, two threshold voltages should be used to control the SD circuit.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R106-006.a














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