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PDF TA31275FN Data sheet ( Hoja de datos )
| Número de pieza | TA31275FN | |
| Descripción | AM/FM RF/IF Detector IC for Low Power Wireless System | |
| Fabricantes | Toshiba Semiconductor | |
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( 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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1 page  
TA31275FN/ TA31275FNG
Functions
1. Waveform Shaper Circuit (comparator)
The output data (pin 12) are inverted.
2. RSSI Function
DC potential corresponding to the input level of IF IN (pin 6) is output to RSSI (pin 21). Output to RSSI
(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 VCC
− 1 V or less, because AM doesn’t correct movement Filter AMP when voltage of RSSI high.
21 After R is
connected
Figure 1
IF input level
Figure 2
3. VCC Pin and GND Pin
Use the same voltage supply for VCC − Lo (2 pin) and VCC1 (5 pin) and VCC2 (11 pin) (or connect them).
Also, use the same voltage supply source for GND1 (17 pin) and GND2 (8 pin) (or connect them).
4. Local Oscillator Circuit
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
level will become approximately 100dBµV.
By switching the Lo switch (LOBS), the frequency set by the external circuit can be used as-is without
using the ×8 circuit.
Lo Switch (LOBS)
Local oscillation
status
H
×8 circuit in operation
L
×8 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 600 µA.
14
RF DEC
Figure 3
5
03-01-23
5 Page 
TA31275FN/ TA31275FNG
Maximum Ratings
(unless otherwise specified, Ta = 25°C. the voltage is with reference to the ground level.)
Characteristics
Symbol
Rating
Unit
Supply voltage
Power dissipation
Operating temperature range
Storage temperature range
VCC
PD
Topr
Tstg
6
780
−40 to 85
−55 to 150
V
mW
°C
°C
The maximum ratings must not be exceeded at any time. Do not operate the device under conditions outside the
above ratings.
Operable Range
(unless otherwise specified, Ta = 25°C. the voltage is with reference to the ground level.)
Characteristics
Operating voltage range
RF operating frequency 1
RF operating frequency 2
Local frequency
Symbol
VCC
fRF1
fRF2
fLO
Test
Circuit
Test Condition
Min Typ. Max Unit
2.4 5.0 5.5
V
When frequency multiplication
is used
240
450 MHz
When frequency multiplication
is not used
100
450 MHz
When frequency multiplication
is used (×8)
250.7
439.3 MHz
Operating ranges indicate the conditions for which the device is intended to be functional even with the electrical
changes.
Electrical Characteristics (unless otherwise specified: Ta = 25°C, VCC = 5 V,
fin (RF) = fin (MIX) = 314.9 MHz, fin (IF) = 10.7 MHz)
Characteristics
Current dissipation at battery saving
RF amp gain 1
Mixer conversion gain
RSSI output voltage 1
RSSI output voltage 2
RSSI output voltage 3
RSSI output resistance
Comparator input resistance
Data output voltage (L level)
Data output leakage current (H level)
BS pin H-level input voltage
BS pin L-level input voltage
LOBS pin H-level input voltage
LOBS pin L-level input voltage
Symbol
Icco
Gv (RF) 1
Gv (MIX)
VRSSI1
VRSSI2
VRSSI3
RRSSI
RCOMP
VDATAL
IDATAH
VBSH
VBSL
VLOBSH
VLOBSL
Test
Circuit
Test Condition
3 BS = “L”, LOBS = “L”
1 (5)
The input and output
impedances are 50 Ω.
Vin (IF) = 35dBµVEMF
Vin (IF) = 65dBµVEMF
Vin (IF) = 100dBµVEMF
1 (3) IDATAL = 500 µA
1 (4)
Min Typ. Max Unit
0
5 µA
−9.0 −6.0 −3.0 dB
17 21 25
0.05 0.25 0.45
0.8 1.05 1.3
1.6 1.95 2.3
22 30 38
75 100 125
0.4
2
2.2 5.5
0 0.2
2.2 5.5
0 0.2
dB
V
V
V
kΩ
kΩ
V
µA
V
V
V
V
11 03-01-23
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet TA31275FN.PDF ] | |
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