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TA31273FN датащи(PDF) 4 Page - Toshiba Semiconductor

номер детали TA31273FN
подробное описание детали  AM RF/IF Detector IC
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производитель  TOSHIBA [Toshiba Semiconductor]
домашняя страница  http://www.semicon.toshiba.co.jp/eng
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TA31273FN
2002-07-08
4
Functions
1. Waveform shaper circuit (comparator)
The output data (pin 10) are inverted.
2. RSSI function
DC potential corresponding to the input level of IF IN (pin 6) is output to RSSI (pin 18). Output to RSSI
(pin 18) is converted to a voltage by the internal resistance. Thus, connecting external resistance R to pin
18 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, the temperature
characteristic of the RSSI output may change. Also, the maximum RSSI value should be VCC − 1 V.
Figure 1
Figure
2
3. VCC pin and GND pin
Use the same voltage supply source for VCC1 (pin 2) and VCC2 (pin 5) (or connect them). Also, use the same
voltage supply source for GND1 (pin 15) and GND2 (pin 9) (or connect them).
4. Local oscillator circuit
The local oscillator circuit is external-input-only. Input to pin 1 at a level from 95 to 105dB
µV.
By switching the Lo switch (LOBS), the frequency set by the external circuit can be used as-is without
using the x8 circuit.
Lo Switch (LOBS)
H
L
Local oscillation status
x8 circuit in operation
x8 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 kΩ, the current dissipation is approximately 800 µA.
Figure
3
12
RF DEC
18
IF input level
After R is connected


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