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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： | 14/25页 |
| 文件大小： | 2570K |
| 代理商： | TK14489V |
TK14489V
GC3-E011E
Page 21
It is possible to use the included limitter amplifier as
single in addition to the standard application which use is
detecting through a phase shifter.
As the composition of pin 9 is shown in fig.9, pin 9 is
usable as a limitter amplifier but it needs pin 9 is bias by
a proper resistor R
L
If the detector isn't used, pin 10 must be connected by
V
CC. We recommend RL=2k as standard, but it is usable
so far as 10k
.
12-4. RSSI Section
The signal, which is pulled out from middle stage of IF
limitter amplifier, enters RSSI circuit (S meter detector).
RSSI output is the current mode. It is converted the
voltage mode by a conversion resistor RS connected
between pin 12 and GND.
12-4-1. Time Constant
Time constant
τ is decided by the product R
S×CS of an
external conversion resistor R
S and a smoothing capacitor
C
S which is parallel the conversion resistor.
As time constant
τ=(R
S×CS) grows large, it becomes hard
to be influenced external disturbance or the ingredients of
amplitude modulation, but RSSI output voltage transient
response characteristics become dull. Determine the time
constant
τ by the uses.
12-4-2. RSSI Output Voltage Range
The slope of RSSI curve is variable by an external
conversion resistor R
S.
If RSSI slope is varied, the
maximum range of voltage-converted RSSI output is the
low limit GND level to the top limit about V
CC-0.2 which
is the value that the supply voltage subtract the collector
saturation voltage V
CE(SAT) of output transistor.
12-4-3. Temperature Characteristics
It is possible to change the temperature characteristics of
RSSI output voltage by changing the temperature
coefficient of an external conversion resistor. Normally,
the temperature characteristics of RSSI output voltage is
enough stable by using the carbon resistor or metal film
resistor which temperature coefficient is 0~200ppm/
°C.
12-5. FM Demodulator
It is included the quadrature FM demodulator used
Gilbert cell.
12-5-1. Internal equivalent circuit
Inner equivalent circuit of demodulator is showed as
following draw, fig.10.
Figure 10: Internal Equivalent Circuit of Demodulator
MultiPlier
Cell
Active Load
Vcc
10pF
Vcc
R
D
Q
1
Q
2
9
Vcc
10
R
L
LIMITTER
OUTPUT
Attentions in this point is to add the bias voltage in pin
9~10 from external source.
The signal from the phase shifter is put in the multiplier
in a dotted line through emitter follower of transistor Q
1.
The notice to use is pin 10 pin have to impress the bias
voltage from external source, because pin 10 is single-
connected with the base terminal. It is necessary for pin
10 to add same voltage, as the base terminal of Q
2 of the
opposite side of Q
1 through the multiplier is connected
with the supply voltage.
The case of using LC resonance circuit has no problem as
fig. 10. However, it is need enough care to use the
ceramic discriminator. If the base voltages difference
between transistor Q1 and Q2 exists, it is occurred the
alteration of DC zero point or the growing worse of the
distortion of demodulation output.
It is ideal that pin input level is saturated at the multiplier.
It is ease to disperse the modulation output when this
level becomes low. From this viewpoint, it is ideal to be
stable operation that amplitude of IF signal at pin is
100mV
P-P or more.
12-5-2. Phase Shifter
The phase of IF limiter amplifier is made be shifted 9
0°
for quadrature detecting.
It is possible to use either type the RCL resonance and or
ceramic discriminator. It is capable to use inner phase
shift capacitance (10pF) in the case of RCL resonance.
The following draws show the examples of phase shifter.
In the case of using the ceramic discriminator, it is
necessary to increase phase-shift-capacitance C by adding
external capacitance.
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相关代理商/技术参数 |
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| 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 |
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