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| 型号： | TA31275FNG |
| 元件分类： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PDSO24 |
| 封装： | 0.300 INCH, 0.65 MM PITCH, PLASTIC, SSOP-24 |
| 文件页数： | 21/25页 |
| 文件大小： | 561K |
| 代理商： | TA31275FNG |
TA31275FN/ TA31275FNG
03-01-23
5
Functions
1.
Waveform Shaper Circuit (comparator)
The output data (pin 12) are inverted.
2.
RSSI Function
DC potential corresponding to the input level of IF IN (pin 6) is output to RSSI (pin 21). Output to RSSI
(pin 21) is converted to a voltage by the internal resistance. Thus, connecting external resistance R to pin
21 varies the gradient of the RSSI output as shown below. Note that due to the displacement of
temperature coefficients between external resistor R and the internal IC resistor IC resistor, the
temperature characteristic of the RSSI output may change. Also, the maximum RSSI value should be VCC
1 V or less, because AM doesn’t correct movement Filter AMP when voltage of RSSI high.
Figure 1
Figure 2
3.
VCC Pin and GND Pin
Use the same voltage supply for VCC Lo (2 pin) and VCC1 (5 pin) and VCC2 (11 pin) (or connect them).
Also, use the same voltage supply source for GND1 (17 pin) and GND2 (8 pin) (or connect them).
4.
Local Oscillator Circuit
The local oscillator circuit is external-input-only. The device incorporates no transistor for oscillation.
Input to pin 1 at a level from 95 to 105dB
V.
Adjust the values of constants C107 and C108 shown in the application circuit diagram so that the input
level will become approximately 100dB
V.
By switching the Lo switch (LOBS), the frequency set by the external circuit can be used as-is without
using the
×8 circuit.
Lo Switch (LOBS)
H
L
Local oscillation
status
×8 circuit in operation
×8 circuit halted/through pass
5.
RF Amp Current Adjustment
The RF amp current dissipation can be regulated by varying resistor R as shown in the figure below.
When R
= 1 k, the current dissipation is approximately 600 A.
Figure 3
14
R
RF DEC
IF input level
After R is
connected
30
k
21
R
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TA31275FNG(EL) | 功能描述:射频无线杂项 200MHz-450MHz Receiver RoHS:否 制造商:Texas Instruments 工作频率:112 kHz to 205 kHz 电源电压-最大:3.6 V 电源电压-最小:3 V 电源电流:8 mA 最大功率耗散: 工作温度范围:- 40 C to + 110 C 封装 / 箱体:VQFN-48 封装:Reel |
| TA31275FNG(O,EL) | 制造商:Toshiba America Electronic Components 功能描述:IC RECEIVER RFIC 450MHZ 24SSOP |
| TA-316-PT | 制造商:WELCON 功能描述: |
| TA3-1R3K-V-T/R | 制造商:Diptronics Manufacturing Inc 功能描述: |
| TA3-1W2K-V-T/R | 制造商:Diptronics Manufacturing Inc 功能描述: |
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