TA31275FNG Toshiba, TA31275FNG Datasheet - Page 5

• Manufacturer Part Number: TA31275FNG
• Description: IC RF/IF DETECTOR 450MHZ 24-SSOP
• Manufacturer: Toshiba

Specifications of TA31275FNG

• Frequency: 240MHz ~ 450MHz
• Rf Type: AM, FM
• Voltage - Supply: 2.4 V ~ 5.5 V
• Current - Supply: 7.3mA
• Package / Case: 24-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Accuracy: -
• Input Range: -
• Other names: TA31275FNGTR

Functions
1. Waveform Shaper Circuit (comparator)
2. RSSI Function
3. V
4. Local Oscillator Circuit
5. RF Amp Current Adjustment
(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 V
− 1 V or less, because AM doesn’t correct movement Filter AMP when voltage of RSSI high.
Also, use the same voltage supply source for GND1 (17 pin) and GND2 (8 pin) (or connect them).
level will become approximately 100dBµV.
using the ×8 circuit.
When R = 1 kΩ, the current dissipation is approximately 600 µA.
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The output data (pin 12) are inverted.
DC potential corresponding to the input level of IF IN (pin 6) is output to RSSI (pin 21). Output to RSSI
Use the same voltage supply for V
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 105dBµV.
Adjust the values of constants C107 and C108 shown in the application circuit diagram so that the input
By switching the Lo switch (LOBS), the frequency set by the external circuit can be used as-is without
The RF amp current dissipation can be regulated by varying resistor R as shown in the figure below.
Pin and GND Pin
Lo Switch (LOBS)
Local oscillation
status
Figure 1
21
×8 circuit in operation
CC
− Lo (2 pin) and V
H
Figure 3
RF DEC
14
5
CC1
(5 pin) and V
IF input level
×8 circuit halted/through pass
Figure 2
TA31275FN/ TA31275FNG
After R is
connected
L
CC2
(11 pin) (or connect them).
03-01-23
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