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参数资料
| 型号： | TK83361MTL |
| 厂商： | ASAHI KASEI POWER DEVICES CORP |
| 元件分类： | 接收器 |
| 英文描述： | AUDIO SINGLE CHIP RECEIVER, PDSO16 |
| 封装： | SOP-16 |
| 文件页数： | 4/15页 |
| 文件大小： | 155K |
| 代理商： | TK83361MTL |
Page 12
December 2000 TOKO, Inc.
TK83361M
APPLICATIONS INFORMATION (CONT.)
12-2. IF Section
The IF section includes a 6 stage differential amplifier. The
fixed internal input matching resistor is 1.8k
. The total gain
of the limiting amplifier section is approximately 77dB.
The decoupling capacitors of Pin 6~7 must be connected as
near as possible to the GND pin of the IC . And, make the
impedance of the connecting-to-GND line to be as small as
possible. If the impedance is not small enough, the sensitivi-
ties may worsen.
12-3. FM Demodulator
A quadrature FM demodulator using a Gilbert cell is in-
cluded.
12-3-1. Internal Equivalent Circuit
The internal equivalent circuit is shown in Fig. 8.
Figure 7: IF Limiter Amplifier Input Block
Note at this point to add the bias voltage at Pin 8 from
external source.
The signal from the phase shifter is put into the multiplier cell
through the emitter follower of transistor Q
1. Pin 8 is single-
connected with the base terminal. And, it is necessary for
Pin 8 to add the 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.
If the base voltages differ between transistors Q
1 and Q2, it
alters the DC zero point or worsens the distortion of the
demodulation output.
12-3-2. Phase Shifter
The IF signal from the limiter amplifier is provided with 90°
phase shift and drives the quadrature detector.
The parallel RCL resonance circuit is capable of using the
internal 10pF phase shift capacitor.
12-3-3. Audio Output
After quadrature detection, the audio signal is pulled out
through Pin 9.
The required signal is pulled out through the LPF.
12-3-4. For Stable Operation
To prevent worsening the distortion, observe the following
notes:
(1) Demodulated Output Voltage
Too large of a demodulated output voltage will worsen the
distortion due to the dynamic range of the demodulator.
(2) The Signal Level in Phase Shifter (Pin 8)
If the phase shifter signal level is too small, the noise level
grows worse. This will cause the distortion to grow worse.
(3) Band Width of Phase Shifter (Pin 8)
If the bandwidth of the phase shifter is narrower than IF
bandwidth, including the demodulated element, the distor-
tion will grow worse.
12-4. Filter Amplifier Section
An inverting op amp has an output at Pin 11 and the inverting
input at Pin 10. The op amp, which has a wide stable
operating temperature range, may be used as an active
noise filter.
12-4-1. Active BPF Application
An active BPF application is shown in Fig. 9, and its
Response is shown in Fig. 10.
Figure 8: Internal Equivalent Circuit of Demodulator
6
51.8K
50K
1.8k
7
5
VCC
8
Active Load
10pF
RD
QUAD
COIL
Q1
Q2
from
I
F
LI
M
AM
P
Multiplier
Cell
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相关代理商/技术参数 |
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|---|---|
| TK83361MTL/83361 | 制造商:TOKO 制造商全称:TOKO, Inc 功能描述:NARROW BAND FM IF IC |
| TK83361MTL-G | 制造商:TOKO Inc 功能描述: |
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