- 您现在的位置：买卖IC网 > PDF目录98230 > TK14489V (TOKO INC) FM, AUDIO SINGLE CHIP RECEIVER, PDSO20 PDF资料下载
参数资料
| 型号： | TK14489V |
| 厂商： | TOKO INC |
| 元件分类： | 接收器 |
| 英文描述： | FM, AUDIO SINGLE CHIP RECEIVER, PDSO20 |
| 封装： | TSSOP-20 |
| 文件页数： | 13/25页 |
| 文件大小： | 2570K |
| 代理商： | TK14489V |
TK14489V
GC3-E011E
Page 20
oscillator operation current. In that case, the amount
increased of oscillator operation current I
e showed
as
following expression (1).
e
CC
e
BE
CC
e
R
V
R
V
I
7
.
0
=
=
(1)
Values of C2~C3~L loop circuit network in fig. 5 is
established which is filled in oscillation condition at only
3
rd overtone frequency. A 2 port impedance characteristic
of C
2~C3~L loop oscillation circuit is shown in fig. 6. As
the oscillation condition, the impedance characteristic is
capacitansive at the vicinity of the overtone frequency,
reactansive at the vicinity of the fundamental frequency.
Therefore,
the
oscillation
condition
is
filled
in,
established the fundamental wave oscillation frequency is
included between the series oscillation frequency f
a and
the parallel oscillation frequency f
b in fig.6, besides the
overtone frequency 3
×f
OSC is fb or more.
Figure 6: 2 Port Impedance Characteristics of Oscillation
Circuit Network (Reactance Characteristics)
f
OSC
f
b
f
a
3
×
××
×f
OSC
+j
-j
Reactance
where,
f
a: series resonant freq.
f
b: parallel resonant freq.
f
OSC:
fundamental
wave
mode freq. of X'tal oscillator
3
×f
OSC:
3
rd
order overtone
frequency of X'tal oscillator
It shows expressions of 3
rd order overtone oscillation as
follows.
2
1
C
L
f
a
×
=
π
,
3
2
1
C
f
a
b
+
=
(2)
A series value of the equivalent capacitance at 3 rd order
overtone frequency of this circuit network which is
decided in the above-mentioned and the capacitance of C
1,
which must be equal to load capacitance C
L.
(3)Oscillation level fitting
Being shortage of negative resistor of the circuit, increase
bias current of transistor by decreasing R
e. The oscillation
level is decided by minute adjustment of R
e.
(4)Most suitable oscillation level range
Please refer the most suitable oscillation level range to
12dB SINAD sensitivity versus oscillation input voltage
in TYPICAL CHARACTERISTICS. The saturating
range is the most suitable oscillation level range. It is
comparative easy to decide circuit constant, examining it
by a network analyzer.
Figure 7: Most Suitable Oscillation Level Range
V
OSC, Local OSC Input Signal Level(dBm)
-70
SINAD
,12dB
SINAD
Sensitivity(dB
)
0
60
20
10
-30
-40
-20
0
-10
40
30
20
10
-50
-60
50
Most Suitable
OSC Level
Range
12-3. IF Section
The IF limitter amplifier is composed of 6 stage direct
connecting emitter-coupled pairs. The input block include
a matching resistor, which value is 1.5k
. The gain of IF
limited amplifier is high, 70dB@f
IF=455kHz. IF output is
outputted in pin 11 through emitter follower. AF output
level is 250mV
P-P at this terminal.
Decoupling capacitances must be connected to GND as
near GND terminal of IC as possible. And, make the
impedance of connecting-to-GND lime to be as small as
possible. It is happened to be worth sensitivities and so on,
if the impedance is enough small.
Figure 8: The Vicinity of IF Limiter Amplifier
6
8
1.5k
7
100k
101.5k
~
(1)Limitter amplifier single use
Figure 9: Limitter Amplifier Single Use Application
10pF
Vcc
9
10
R
L
Vcc
QUAD
DET
Limitter Amp Output
相关PDF资料 |
PDF描述 |
|---|---|
| TK15405BM | 1 CHANNEL, VIDEO AMPLIFIER, PDSO6 |
| TK15405BM | 1 CHANNEL, VIDEO AMPLIFIER, PDSO6 |
| TK15417BM | 1 CHANNEL, VIDEO AMPLIFIER, PDSO6 |
| TK15417BM | 1 CHANNEL, VIDEO AMPLIFIER, PDSO6 |
| TK15450L | 2 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TK14551V | 制造商:TOKO 制造商全称:TOKO, Inc 功能描述:FM IF DETECTOR/AMPLIFIER |
| TK14551V/14551 | 制造商:TOKO 制造商全称:TOKO, Inc 功能描述:FM IF DETECTOR/AMPLIFIER |
| TK14551VTL | 制造商:TOKO 制造商全称:TOKO, Inc 功能描述:FM IF DETECTOR/AMPLIFIER |
| TK14552V | 制造商:TOKO 制造商全称:TOKO, Inc 功能描述:Wide band AM / ASK IF IC for ETC |
| TK14583V-G | 制造商:TOKO 制造商全称:TOKO, Inc 功能描述:Wide band FM IF IC for remote keyless entry / tire pressure monitoring system |
发布紧急采购，3分钟左右您将得到回复。