ta31273fn TOSHIBA Semiconductor CORPORATION, ta31273fn Datasheet - Page 4

• Manufacturer Part Number: ta31273fn
• Description: Am Rf/if Detector Ic
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Functions
1. Waveform shaper circuit
2. RSSI function
3. V
4. Local oscillator circuit
5. RF amp current adjustment
The output data (pin 10) are inverted.
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 V
Use the same voltage supply source for V
voltage supply source for GND1 (pin 15) and GND2 (pin 9) (or connect them).
The local oscillator circuit is external-input-only. Input to pin 1 at a level from 95 to 105dBµV.
By switching the Lo switch (LOBS), the frequency set by the external circuit can be used as-is without
using the x8 circuit.
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.
CC
pin and GND pin
Local oscillation status
Lo Switch (LOBS)
Figure 1
(comparator)
18
Figure 3
RF DEC
12
x8 circuit in operation
CC1
(pin 2) and V
H
4
CC2
IF input level
Figure 2
(pin 5) (or connect them). Also, use the same
x8 circuit halted/through pass
After R is connected
L
TA31273FN
CC
2002-07-08
− 1 V.