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TA31273FN
TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic
TA31273FN
AM RF/IF Detector IC
The TA31273FN is an RF/IF detector IC for AM radio. The IC incorporates an RF amp, 2-level comparator, and local x8 circuit.
Features
* * * * * * RF frequency: 240 to 450 MHz IF frequency: 10.7 MHz Operating voltage range: 3.0 to 5.5 V Current dissipation: 6.8 mA (typ.) (Not operating local oscillator) Current dissipation at BS: 0 A (typ.) Small package: 20-pin SSOP (0.65-mm pitch) Weight: 0.09 g (typ.)
Block Diagram
SAW
20 19 FIL FIL OUT IN
18 17 RSSI BS RSSI
16 15 14 13 12 11 RF RF MIX GND1 RF MONI OUT DEC IN IN
Comparator
x8
OSC VCC1 LOBS IN 1 2 3
MIX IF IF OUT VCC2 IN DEC REF GND2 DATA 4 5 6 7 8 9 10
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TA31273FN
Pin Function (The Values Of Resistor And Capacitor In The Internal Equivalent Circuit
Are Typical.)
Pin No. Pin Name Function Internal Equivalent Circuit
15 k
1
OSC IN
Local oscillator input pin.
1
2 pF 5 k
2
VCC1
Power supply pin 1.
3
LOBS
Lo switch pin. H: x8 circuit in operation Lo: Through pass
3
60 k
4
MIX OUT
Mixer output pin.
210 4
5
VCC2
Power supply pin 2.
6
IF IN
IF amp input pin.
3 k 170 170
7
IF DEC
IF amp input pin. Used as a bias coupling pin.
6
15 k 7 DATA
500 20 8 REF AM comparator REF pin. 19 5.5 k 40 k
5 k 8 40 k
COMP
9
GND2
GND pin 2.
10
DATA
AM waveform shaping output pin. Open collector output. Connect a pull-up resistor.
10
2 k
2
5 k
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TA31273FN
Pin No. Pin Name Function Internal Equivalent Circuit
11
RF IN
RF signal input pin.
14
12
RF DEC
Emitter pin for internal transistor. 11
3 k
14
RF OUT
RF amp output pin.
12
15
GND1
GND pin 1.
2.4 k
16
MIX IN
Mixer input pin.
16
17
BS
Battery saving pin.
17
50 k
18
RSSI
RSSI output pin.
18 20 k
19
FIL IN
AM LPF input pin. 19 5.5 k 500 20
20
FIL OUT
AM LPF output pin.
Equivalent circuits are given to help understand design of the external circuits to be connected. They do not accurately represent the internal circuits.
500
20 k
13
MONI
Since this pin is connected to an internal circuit, it should either be left open or connected to GND.
13
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TA31273FN
Functions
1. Waveform shaper circuit (comparator)
The output data (pin 10) are inverted.
2. RSSI function
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 VCC - 1 V.
20 k
18 R
After R is connected
IF input level
Figure 1
Figure 2
3. VCC pin and GND pin
Use the same voltage supply source for VCC1 (pin 2) and VCC2 (pin 5) (or connect them). Also, use the same voltage supply source for GND1 (pin 15) and GND2 (pin 9) (or connect them).
4. Local oscillator circuit
The local oscillator circuit is external-input-only. Input to pin 1 at a level from 95 to 105dBV. By switching the Lo switch (LOBS), the frequency set by the external circuit can be used as-is without using the x8 circuit.
Lo Switch (LOBS) Local oscillation status
H x8 circuit in operation
L x8 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 k, the current dissipation is approximately 800 A.
12 RF DEC
Figure 3
R
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TA31273FN
6. Battery-saving (BS) function and Lo switch LOBS function
The IC incorporates a battery-saving function and a Lo switch function. These functions offer the following selection.
IC Current Dissipation (at no signal)
BS Pin/LOBS Pin
Circuit Status in the IC Circuits in operation * * * * * * * x8 circuit Mixer RF amp Comparator IF amp RSSI Comparator capacitor charger circuit
H/H
6.8 mA (typ.)
H/L L/H L/L
x8 circuit only halted, Frequency set by external circuit can be used as-is. x8 circuit only in operation All circuits halted
3.8 mA (typ.) 3.0 mA (typ.) 0 mA (typ.)
7. RF amp gain 1
RF amp gain 1 (GV (RF) 1) is a reference value calculated as follows. Measure GRF in the following figure.
0.01 F 27 nH 1 k 6 pF
1000 pF
6 pF SAW 33 nH SG 50dBV
16
14
11
4
6
GRF
Figure 4 GV (RF) 1 is calculated as follows: GV (RF) 1 = GRF - GV (MIX)
8. IF amp gain
The intended value is 70dB.
9. Waveform-shaping output duty cycle
The specified range of electrical characteristics is only available for single-tone.
10. Local frequency range (after multiplying frequency by 8)
When the multiplier circuit is used, the local frequency will be in the range 250.7 MHz to 439.3 MHz.
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TA31273FN
11. Bit rate filter for AM
The current AM bit rate filter is used as a quadratic filter. If the filter is to be used at a rate other than 1200 bps, please change the filter constant. Quadratic filter (NRZ) (The bit rate filter time constant takes into account the internal resistance RSSI (20 k).)
R9 1200 bps 2400 bps 4800 bps 47 k 47 k 47 k R8 68 k 68 k 68 k C14 1500 pF 680 pF 390 pF C13 4700 pF 2200 pF 1000 pF
When the filter constants shown below are used, it is not necessary to set the R9 constant value.
R9 1200 bps 2400 bps 4800 bps
R8 20 k 20 k 20 k
C14 2200 pF 1500 pF 820 pF
C13 6800 pF 3300 pF 1800 pF
In addition, the current AM bit rate filter can be used as a tertiary filter. If the filter is to be used at a rate other than 1200 bps, please change the filter constant. Quadratic filter (NRZ) (The bit rate filter time constant takes into account the internal resistance RSSI (20 k).)
R10 1200 bps 2400 bps 4800 bps 47 k 47 k 47 k R9 68 k 68 k 68 k R8 68 k 68 k 68 k C16 3300 pF 1500 pF 680 pF C14 560 pF 270 pF 150 pF C13 0.01 F 4700 pF 2200 pF
When the filter constants shown below are used, it is not necessary to set the R10 constant value.
R10 1200 bps 2400 bps 4800 bps
R9 20 k 20 k 20 k
R8 20 k 20 k 20 k
C16 8200 pF 3900 pF 1800 pF
C14 2200 pF 1000 pF 470 pF
C13 0.033 F 0.015 F 6800 pF
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TA31273FN
Maximum Ratings (Unless Otherwise Specfied Ta = 25C, Voltage Value is Determined by
GND (TYP))
Characteristics Supply voltage Current dissipation Operating temperature range Storage temperature range Symbol VCC PD Topr Tstg Rating 6 710 -40~85 -55~150 Unit 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.
Operating available Range
(Unless Otherwise Specified Ta = 25*Z
Characteristics Operating voltage range Symbol VCC
, Voltage Value is Determined by GND(typ.))
Test Circuit Test Condition Min 3.0 Typ. 5.0 Max 5.5 Unit V
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 = 25C, VCC = 5.0V , Rfin = 314.9
MHz, AM = 90%,Ifin = 10.7MHz , af = 600 Hz (square wave))
Characteristics Current dissipation at no signal Current dissipation at battery saving RF amp gain 1 RF amp gain 2 RF amp input resistance RF amp input capacitance RF amp output capacitance Mixer conversion gain Mixer input resistance Mixer input capacitance Mixer output resistance Mixer intercept point IF operating frequency IF amp input resistance RSSI output voltage 1 RSSI output voltage 2 RSSI output voltage 3 RSSI output resistance Waveform shaping output duty cycle 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 Iccq Icco GV (RF) 1 GV (RF) 2 R (RF) IN C (RF) IN C (RF) OUT GV (MIX) R (MIX) IN C (MIX) IN R (MIX) OUT IP3 fIF R (IF) IN VRSSI1 VRSSI2 VRSSI3 RRSSI DR VDATAL IDATAH Test Circuit 2 3 1 (5) 1 (6) 1 (1) 1 (1) 1 (1) 1 (2) 1 (3) 1 (4) Test Condition VCC = 5.0 V, BS/LOBS = H/H*h Fin (LO) = 40.7 MHz Vin (RF) = 50dBV 50 input/output Vin (IF) = 35dBVEMF Vin (IF) = 65dBVEMF Vin (IF) = 100dBVEMF Vin (IF) = 80dBVEMF for single-tone IDATAL = 1 mA Min 5.1 -6.5 17.5 0.1 0.95 1.9 15 45 2.7 0 2.7 0 Typ. 6.8 0 20 -3.5 900 2.5 2 21.5 1.5 2.5 330 93 10.7 330 0.3 1.20 2.3 20 50 Max 8.5 5 -0.5 25.5 0.5 1.45 2.7 25 55 0.4 2 5.5 0.2 5.5 0.2 dBV MHz V V V k % V A V V V V Unit mA A dB dB pF pF dB k dB
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TA31273FN
Test Circuit
VCC R9 68 k C16 3300 pF C23 VCC 1000 pF C20 47 k 0.01 F 1000 pF
R13 1 k
C14 560 pF
C24 C25 1 k R14 6
C13 0.01 F
L4
R8
27nH
6 pF
20 19 FIL FIL OUT IN
R10
18 17 RSSI BS RSSI
16 15 14 13 12 11 MIX GND1 RF MONI RF RF OUT IN DEC IN
COMP x8
0.01 F C22
0.01 F
0.01 F
0.22 F
C15
C17
VCC VCC
VCC BPF 0.01 F
VCC DATA
Test Circuit 1
(1) VRSSI (2) DR
0.01 F 6 62 SG 18 1000 pF V SG
0.01 F 10 100 k VCC V 10 100 k V I = V/100 x 10 3.0 V V 19
3
(3) VDATA L
(4) IDATA H
2.5 V V 8 10
R = 4.7 k VCC
2.5 V V 8 VCC
3.0 V V 19
62
R15
100 k
OSC VCC1 LOBS IN 1 2 3
MIX IF IF OUT VCC2 IN DEC 4 5 6 7 C21
REF GND2 DATA 8 9 10
1000 pF
68 k
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TA31273FN
(5) Gv (RF) 2 (6) GV (MIX)
0.01 F 1 51 SG 51 4 0.01 F 6
1000 pF 11 51 SG 14
1000 pF
1000 pF 16 51 SG
Test Circuit 2
Iccqam
51 k SG 0.01 F 9 1
15
5
17
1 k 12
2
14
A
Test Circuit 3
Icco
9
15
17
2
5
14
A VCC
1 k 12
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TA31273FN
Reference data*i This is temperature characteristics data when it used evaluation boards. This is not guarantee on condition that it is stating except electrical characteristics. *j
Current consumption vs. Power supply voltage characteristics
10 8 All internal circuits used
Current consumption vs. Power supply voltage characteristics
Current consumtion Iccq (mA)
8
Current consumtion Iccq (mA)
6 Multiplier circuit turned off and external circuit used 4
6 100C 4 25C -40C Fin (Lo) = 40.7 MHz Vin (Lo) = 100 dBV BH: H 0 0 1 2 3 4 LOBS: H 5 6
Only multiplier circuit used
2 BS 0 0
2
Fin (Lo) = 40.7 MHz Vin (Lo) = 100 dBV Ta = 25C 1 2 3 4 5 6
Power supply voltage
VCC (V)
Power supply voltage
VCC (V)
RF amp gain vs. Power supply voltage characteristics
0 3
RSSI output voltage characteristics (MIX input)
110C
(dB)
(V) VRSSI
-10
2.5
RF amp gain 2 Gv (RF) 2
2 25C 1.5 -40C
-20 100C -30 25C -40
RSSI output voltage
1 Fin (MIX) = 314.9 MHz Fin (Lo) = 40.7 MHz Vin (Lo) = 100 dBV
-40C
Fin (RF) = 314.9 MHz Vin (RF) = 50 dBV
0.5
-50 1
2
3
4
5
6
0 -20
0
20
40
60
80
100
120
Power supply voltage
VCC (V)
MIX IN input level Vin (dBVEMF)
Mixer conversion gain vs. Power supply voltage characteristics
30 30
Mixer conversion gain vs. Power supply voltage characteristics
Gv (Mix) (dB)
Gv (Mix) (dB)
20
20 10 -40C 0 25C -10 -20 -30 -40 1 110C Fin (MIX) = 314.9 MHz Vin (MIX) = 50 dBV Fin (Lo) = 304.2 MHz Vin (Lo) = 100 dBV LOBS: L 2 3 4 5 6
10
110C
Mixer conversion gain
0 25C -10 -40C Fin (MIX) = 314.9 MHz Vin (MIX) = 50 dBV Fin (Lo) = 40.7 MHz -20 Vin (Lo) = 100 dBV LOBS: H -30 1 2 3 4 5 6
Power supply voltage
VCC (V)
Mixer conversion gain
Power supply voltage
VCC (V)
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TA31273FN
Mixer conversion gain vs. Local input level characteristics
25 10
S/N characteristics (IF input)
Gv (Mix) (dB)
20 110C 15 10 5 0 -5 Fin (MIX) = 314.9 MHz -10 -15 60 Vin (MIX) = 50 dBV Fin (Lo) = 40.7 MHz 70 80 90 100 110 120 -9 -10 10 30 50 70 90 25C 110 130 -40C 0 -40C 25C 110C -3 Fin (IF) = 10.7 MHz AM = 90% Fmod = 600 Hz
Mixer conversion gain
S + N, N
(dB)
25C
-5
110C -7 -40C
Local input level
VLO
(dBV)
IF IN input
Vin (IF)
(dBVEMF)
FSK duty cycle vs. Power supply voltage characteristics
60.0 3.0
RSSI output voltage characteristics (IF input)
(V)
110C 2.5
FSK duty cycle DR (%)
VRSSI
55.0
2.0 25C 1.5
-40C
50.0 -40C 25C 45.0 110C Fin (IF) = 10.7 MHz Vin (IF) = 50 dBVEMF AM = 90% Fmod = 600 Hz 3.00 4.00 5.00 6.00
RSSI output voltage
1.0
0.5 Fin (IF) = 10.7 MHz 40.0 0 20 40 60 80 100 120
40.0 1.00
2.00
Power supply voltage
VCC (V)
IF IN input level
Vin
(dBVEMF)
Mixer conversion gain frequency characteristics
25
Gv (MIX) (dB)
20
15
-40C 25C
Mixer conversion gain
10
VCC = 5 V Vin (MIX) = 50 dBV Vin (Lo) = 100 dBV 5 LOBS = "L" * Terminate the IF input impedance.
110C
0 100
1000
Input frequency Fin (MIX) (MHz)
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TA31273FN
Application Circuit
VCC R9 68 k C16 3300 pF 0.01 F C23 VCC 1000 pF C20 47 k 6 pF SAW 33 nH RF IN C24 C25 1 k R14
R13 1 k
C13 0.01 F
C14 560 pF
L4
27nH
6 pF
1000 pF
R8
20 19 FIL FIL OUT IN
R10
18 17 RSSI BS RSSI
16 15 14 13 12 11 MIX GND1 RF MONI RF RF OUT IN DEC IN
Comparator x8
R3 C2
33 k
0.01 F C22
0.01 F
0.01 F
0.22 F
C15
40.7 MHz
47 pF
X1
C3
1 pF 3.3 k 56 pF C9 C7
C17
VCC VCC
VCC
VCC DATA
120 k
R2
R4
BPF
X1 *F TR-1*i Tokyo Denpa Co., Ltd.*j BPF*F SFE10.7MA5-A*i Murata Manufacturing Co., Ltd.*j SAW*F SAFCH315MSM0T00B0S*i Murata Manufacturing Co., Ltd.*j
R15
100 k
OSC VCC1 LOBS IN 1 2 3
MIX IF IF OUT VCC2 IN DEC REF GND2 DATA 4 5 6 7 8 9 10 C21
10 F
0.01 F
C8
1000 pF
68 k
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TA31273FN
Package Dimensions
Weight: 0.09 g (typ.)
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TA31273FN
RESTRICTIONS ON PRODUCT USE
000707EBA
* TOSHIBA is continually working to improve the quality and reliability of its products. Nevertheless, semiconductor devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical stress. It is the responsibility of the buyer, when utilizing TOSHIBA products, to comply with the standards of safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of such TOSHIBA products could cause loss of human life, bodily injury or damage to property. In developing your designs, please ensure that TOSHIBA products are used within specified operating ranges as set forth in the most recent TOSHIBA products specifications. Also, please keep in mind the precautions and conditions set forth in the "Handling Guide for Semiconductor Devices," or "TOSHIBA Semiconductor Reliability Handbook" etc.. * The TOSHIBA products listed in this document are intended for usage in general electronics applications (computer, personal equipment, office equipment, measuring equipment, industrial robotics, domestic appliances, etc.). These TOSHIBA products are neither intended nor warranted for usage in equipment that requires extraordinarily high quality and/or reliability or a malfunction or failure of which may cause loss of human life or bodily injury ("Unintended Usage"). Unintended Usage include atomic energy control instruments, airplane or spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments, medical instruments, all types of safety devices, etc.. Unintended Usage of TOSHIBA products listed in this document shall be made at the customer's own risk. * The products described in this document are subject to the foreign exchange and foreign trade laws. * The information contained herein is presented only as a guide for the applications of our products. No responsibility is assumed by TOSHIBA CORPORATION for any infringements of intellectual property or other rights of the third parties which may result from its use. No license is granted by implication or otherwise under any intellectual property or other rights of TOSHIBA CORPORATION or others. * The information contained herein is subject to change without notice.
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