IC. TA31275FN Datasheet

TA31275FN Datasheet PDF


TA31275FN
( 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)
Block Diagram
Weight: 0.09 g (typ.)
SAW
24 23
LPF LPF
OUT IN
22 21 20 19 18
AF RSSI REF AM/FM MIX
OUT
RSSI
AM/FM
Comparator
IN
17 16 15 14 13
GND1 RF- CHARGE RF- RF-
OUT
DEC IN
×8 Detector
OSC-
IN
1
VCC-
MIX
IF-
Lo LoBS OUT VCC1 IF-IN DEC GND2
2345678
BS QUAD VCC2 DATA
9 10 11 12
BPF
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03-01-23


Part TA31275FN
Description AM/FM RF/IF Detector IC
Feature TA31275FN; ( DataSheet : www.DataSheet4U.com ) TA31275FN/ TA31275FNG TOSHIBA Bipolar Linear Integrated Circuit.
Manufacture Toshiba Semiconductor
Datasheet
Download TA31275FN Datasheet


( DataSheet : www.DataSheet4U.com ) TA31275FN/ TA31275FNG T TA31275FN Datasheet
( DataSheet : www.DataSheet4U.com ) TA31275FN/ TA31275FNG T TA31275FNG Datasheet





TA31275FN
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
1 OSC IN
Local oscillator input pin.
2 VCC-Lo
Local’ power supply pin
3 LOBS
Lo switch pin.
H: ×8 circuit pin.
L: Through pass
1
2 pF
70 k
3
Mixer output pin.
4 MIX OUT The output impedance of the pin is typically
330 .
5 VCC1
Power supply pin 1.
6 IF IN
IF amp input pin.
7 IF DEC
IF amp input pin.
Used as a bias coupling pin.
8 GND2
GND pin 2.
9 BS
Battery saving pin.
245
4
3 k
6
7
40 k
9
2 03-01-23



TA31275FN
Pin No. Pin Name
Function
10 QUAD
Phase-shift input terminal for the FSK
Demodulator.
Connect to the discriminator or LC.
11 VCC2
12 DATA
Power supply pin 2.
FM/AM waveform shaping output pin.
Open collector output.
Connect a pull-up resistor.
13 RF IN
RF signal input pin.
14 RF DEC
Emitter pin for internal transistor.
16 RF OUT
RF amp output pin.
Control terminal for quick charge circuit.
15 CHARGE To use the quick charge circuit, attach a
capacitor.
17 GND1
GND pin 1.
18 MIX IN
Mixer input pin.
TA31275FN/ TA31275FNG
Internal Equivalent Circuit
1 k1 pF
500
10
12
2 k
10 k
13
16
3 k
14
500
15
5 k
18
19 AM/FM
Changeover switch for ASK/FSK.
Hi: AM
Lo: FM
3
300 k
19
03-01-23




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