( DataSheet : www.DataSheet4U.com )
TA31275FN/ TA31275FNG
TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic
...
( DataSheet : www.DataSheet4U.com )
TA31275FN/ TA31275FNG
TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic
TA31275FN, TA31275FNG
AM/FM RF/IF Detector IC for Low Power Wireless System
The TA31275FN is an RF/IF detector IC for AM/FM radio. The IC incorporates an RF amp, 2-level comparator, and local ×8 circuit
Features
RF frequency: 240 to 450 MHz (multiplication is used) 100 to 450 MHz (multiplication is not used) IF frequency: 10.7 MHz Operating
voltage range: 2.4 to 5.5 V Current dissipation: 5.8 mA (FM)/5.4 mA (AM) (except current at oscillator circuit) Current dissipation at BS: 0 µA (typ.) Small package: 24-pin SSOP (0.65 mm pitch) Weight: 0.09 g (typ.)
Block Diagram
SAW
22 20 19 18 17 16 15 14 13 21 24 23 LPF LPF AF RSSI REF AM/FM MIX GND1 RF- CHARGE RFRFOUT IN OUT IN OUT DEC IN AM/FM RSSI Comparator
×8 OSCIN 1 VCCLo LoBS 2 3 MIX OUT 4 IFDEC GND2 7 8
Detector
VCC1 5
IF-IN 6
BS QUAD 9 10
VCC2 DATA 11 12
BPF
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www.DataSheet4U.com
03-01-23
TA31275FN/ TA31275FNG
Pin Description
(the values of resistor and capacitor in the internal equivalent circuit are typical.)
Pin No. Pin Name Function Internal Equivalent Circuit
15 kΩ
1
OSC IN
Local oscillator input pin.
1
2 pF 5 kΩ
2
VCC-Lo
Local’ power supply pin
3
LOBS
Lo switch pin. H: ×8 circuit pin. L: Through pass
3
70 kΩ
Mixer output pin. 4 MIX OUT The output impedance of the pin is typically 330 Ω. 4
245 Ω
5
VCC1
Power supply pin 1.
6
IF IN
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