TOKO TK83361MTL/83361

TK83361M
NARROW BAND FM IF IC
FEATURES
APPLICATIONS
n Wide Operating Voltage Range 2.0 to 8.0V
n RF Input Frequency up to 220 MHz
n Low Supply Current (2.8mA, squelch off, 3.8mA,
n
n
n
n
n
n
n
squelch on)
Low External Component Count
µ)
Excellent Limiting Sensitivity (-3dB = 8dBµ
Amateur Radio Transceivers
Cordless Phones
Remote Controls
Wireless Data Transceivers
Battery Powered Devices
DESCRIPTION
The TK83361M is a narrow band FM IF IC designed for
cordless phones, radio transceivers, remote controls, wireless data transceivers, and other communication equipment.
TK83361M
It integrates the mixer, oscillator, limiting amplifier, FM
demodulator, filter amplifier and squelch circuit into a single
surface mount SOP-16 package. The low operating current combined with a minimum operating voltage of only 2
V makes this device ideal for battery powered devices.
The TK83361M offers improved performance over the
MC3361C. The operating frequency has been increased to
220MHz (vs. 60MHz) while reducing the supply current
from 5.2 mA to 3.8mA (squelch on). Offered in the SOP-16
surface mount package, the TK83361M is a drop-in replacement for the MC3361C.
OSC (B) 1
16 RF INPUT
OSC (E) 2
15 GND
MIXER OUT 3
14 SCAN CONTROL
VCC
4
13 SCAN CONTROL
IF INPUT
5
12 SQUELCH INPUT
DECOUPLE
6
11 FILTER AMP
OUTPUT
DECOUPLE
7
10 FILTER AMP
INPUT
QUAD COIL
8
9 AF OUTPUT
BLOCK DIAGRAM
ORDERING INFORMATION
OSC (B) 1
16 RF INPUT
MIXER
OSC
TK83361M
OSC (E) 2
Tape/Reel Code
GND
MIXER OUT 3
15 GND
14 SCAN CONTROL
SQUELCH
TAPE/REEL CODE
VCC
4
IF INPUT
5
DECOUPLE
6
DECOUPLE
7
13 SCAN CONTROL
VCC
12 SQUELCH INPUT
TL: Tape Left
LIMIT
AMP
FILTER
AMP
11 FILTER AMP
OUTPUT
10 FILTER AMP
INPUT
10pF
QUAD COIL
December 2000 TOKO, Inc.
8
QUAL DET
9 AF OUTPUT
Page 1
TK83361M
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ........................................................ 10 V
Operating Voltage ......................................... 2.0 to 8.0 V
Power Dissipation (Note 1) ................................ 600 mW
Storage Temperature Range ................... -55 to +150 °C
Operating Temperature Range .................. -30 to +70 °C
Input Frequency ............................................... 220 MHz
TK83361M ELECTRICAL CHARACTERISTICS
Test Conditions: VCC = 4.0 V, fRF = 10.7 MHz, VRF = +80dBµ, fm = 1kHz, fdev = ±3kHz, fOSC = 10.245MHz, Ta = 25°C,
unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
ICC1
Supply Current 1
No Signal, Squelch off
2.8
3.5
mA
ICC2
Supply Current 2
No Signal, Squelch on
3.8
4.9
mA
Limit
-3dB Limiting Sensitivity
-3dB pt.(1kHz)
8
15
dBµ
VO
Output Voltage
VRF = +80dBµ, fdev = ±3kHz
ZO
Output Impedance
THD
130
170
mVrms
VRF = +80dBµ, fdev = ±3kHz
450
Ω
Total Harmonic Distortion
VRF = +80dBµ, fdev = ±3kHz
0.86
GM
Mixer Conversion Gain
Pin 3: terminated
RIM
Mixer Input Impedance
DC Measurement
Gf
Filter Amplifier Gain
fin = 10kHz, Vin = 0.3mV
fOC
Filter Amplifier Output
Terminal Voltage
SH
21
2.5
%
28
dB
3.3
kΩ
40
50
dB
No Signal
0.5
0.7
Scan Control High Level
Squelch Input VSQ = 0.0V
3.0
3.9
SL
Scan Control Low Level
Squelch Input VSQ = 2.5V
SH
Scan Control High Level
Squelch Input VSQ = 2.5V
SL
Scan Control Low Level
Squelch Input VSQ = 0.0V
HYS
Squelch Hysteresis
0.0
3.0
0.9
V
V
0.4
3.9
V
V
0.0
0.4
V
45
100
mV
Note 1: Power dissipation must be decreased at a rate of 4.8 mW/°C for operation above 25°C.
Page 2
December 2000 TOKO, Inc.
TK83361M
TEST CIRCUIT
10.245MHz
0.01µF
1
OSC
10µF
GND 15
2
50Ω
100kΩ
120pF
VCC
+
16
MIXER
33pF
0.1µF
CF
3
14
10kΩ
VCC
SQUELCH
4 VCC
13
5
12
1µF
+
0.1µF
6
LIMIT
AMP
0.1µF
FILTER
AMP
11
10
7
470kΩ
1µF
+
510Ω
CF = BLFC455D (TOKO)
CFU455D2 (MURATA)
QUAD COIL = 7MCS-13546Z
10pF
20kΩ
8
9
QUAD DET
QUAD
COIL
8.2kΩ
0.01µF
TYPICAL PERFORMANCE CHARACTERISTICS
9 - 1. Mixer + IF Section
VO(DET), AMR, N, THD vs.
7.0
-30
-40
6.0
5.0
4.0
AMR(mod=30%)
-50
3.0
-60
2.0
-70
1.0
THD
N
-10
-20
-30
-40
-50
1kHz±3kHz
Non-mod
fRF = 10.7MHz
f m = 1kHz
fdev = ±3kHz
fOSC = 10.245MHz
VOSC = ±0dBm
1.5
1.0
0.5
0.0
-0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
τR, RISE TIME (msec)
December 2000 TOKO, Inc.
5.0
4.0
3.0
2.0
N
-70
THD
1.0
0
RELATIVE 20dB NQ
SENSITIVITY(dB)
SUPPLY VOLTAGE, OUTPUT
LEVEL (V)
VCC
2.0
AMR
(MOD.=30%)
6.0
20dB NQS vs. RF INPUT
FREQUENCY
3.5
2.5
VO(DET)
V =4.0V
cc
f =455kHz
IF
f =1kHz, f
=±3kHz
m
dev
-60
TRANSIENT RESPONSE
3.0
7.0
-80
0.0
-20 ±0 +20 +40 +60 +80 +100 +120
VIF, IF INPUT SIGNAL LEVEL (dBµ)
-80
0.0
-20 ±0 +20 +40 +60 +80 +100 +120
VRF, RF INPUT SIGNAL LEVEL (dBµ)
4.0
RF INPUT SIGNAL LEVEL
THD, TOTAL HARMONIC
DISTORTION(%)
VO(DET)
V =4.0V
cc
f =10.7MHz
RF
f =1kHz, f
=±3kHz
m
dev
fOSC=10.245MHz
-20
VO(DET), Output Level, AMR, AM
REJECTION AND N, NOISE (dBV)
-10
RF INPUT SIGNAL LEVEL
THD, TOTAL HARMONIC
DISTORTION(%)
VO(DET), OUTPUT LEVEL, AMR, AM
REJECTION AND N, NOISE (dBV)
VO(DET), AMR, N, THD vs.
-20
20dB NQS = 17.5dBµ
fRF = 10.7MHz
fOSC = 10.245MHz
-40
-60
0
-20
20dB NQS = 18.0dBµ
fRF = 58MHz
fOSC = 58.545MHz
-40
-60
-20 -15 -10 -5 ±0 +5 +10 +15 +20
fRF±∆f RF, RF INPUT
FREQUENCY(kHz)
Page 3
TK83361M
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
9 - 2. Mixer Section
GM, MIXER CONVERSION GAIN
(dB)
VOMR, RELATIVE MIXER OUTPUT
LEVEL (dB)
MIXER INPUT FREQUENCY
RESPONSE
32
30
28
26
VCC = 4.0V
fRF VARIABLE
VRF = +60dBµ
fOM = 455kHz
VOSC = ±0dBm
24
22
1M
10M
100M
1G
fRF, RF INPUT FREQUENCY (Hz)
MIXER OUTPUT FREQUENCY
RESPONSE
0
-2
-4
-6
-8
-10
-12
VCC = 4.0V
fRF = 10.7MHz
-14
VRF = +60dBµ
fOSC VARIABLE
VOSC = ±0dBm
-16
-18
-20
100k
1M
10M
fOM, MIXER OUTPUT FREQUENCY
(Hz)
THE 3rd ORDER INTERCEPT
POINT
SINAD, GM S/N vs. LOCAL OSC
INPUT SIGNAL LEVEL
SINAD, 12dB SINAD SENSITIVITY
(dBµ) S/N, signal to noise ratio (dB)
IIP3 = 107dBµ
120
1st ORDER DESIRED
fRF = 10.7MHz
100
80
60
40
3rd ORDER INTERMOD
fRF1 = 10.7125MHz
fRF2 = 10.725MHz
20
20
40
60
80
100 120
VRF, RF INPUT SIGNAL LEVEL
(dBµ)
SINAD
50
6.0
-40
4.0
-50
2.0
THD
-60
0.0
-40 -30 -20 -10 ±0 +10 +20 +30 +40
455±∆f IF, IF INPUT FREQUENCY (kHz)
Page 4
VO(DC), OUTPUT DC VOLTAGE (V)
-30
THD, TOTAL HARMONIC
DISTORTION(%)
VO(DET), OUTPUT LEVEL(dBV)
O(DET)
8.0
25
20
30
S/N
fRF = 10.7MHz
21MHz
58MHz
83MHz
20
10
15
10
0 -70 -60 -50 -40 -30 -20 -10 0 10 20 0
VOSC, LOCAL OSC INPUT SIGNAL
LEVEL (dBµ)
OUTPUT DC VOLTAGE vs.
IF INPUT FREQUENCY
OUTPUT LEVEL, TOTAL HARMONIC
DISTORTION vs. IF INPUT FREQUENCY
10.0
-10
V
VCC = 4.0V
VIF = ±80dBµ
f m = 1kHz
fdev =±3kHz
30
GM
40
9 - 3. IF Section
-20
35
60
GM, MIXER CONVERSION
GAIN(dB)
VOM, MIXER OUTPUT LEVEL
(dBµ)
140
4.0
3.5
VCC = 4.0V
VIF = +80dBµ
3.0
2.5
2.0
VCC
1.5
RD = 5kΩ
1.0
QUAD
COIL
RD
.5
8
RD = 10kΩ
RD = 20kΩ
0
-80 -60 -40 -20 ±0 +20 +40 +60 +80
455±∆f IF, IF INPUT FREQUENCY (kHz)
December 2000 TOKO, Inc.
TK83361M
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
OUTPUT LEVEL, TOTAL HARMONIC
DISTORTION vs. IF DEVIATION
FREQUENCY
500
5.0
400
4.0
300
3.0
200
2.0
VO(DET)
1.0
100
THD
0
0
1 2 3 4 5 6 7 8 9 10
fdev., IF DEVIATION FREQUENCY
(kHz)
VO(DET)R, RELATIVE OUTPUT
LEVEL (dB)
6.0
VCC =4.0V
fIF = 455kHz
VIF = +80dBµ
f m = 1kHz
THD, TOTAL HARMONIC
DISTORTION(%)
VO(DET), OUTPUT LEVEL(mVrms)
600
OUTPUT LEVEL vs. IF MODULATION
FREQUENCY
±0
RD =
20kΩ
10kΩ
-10
5kΩ
-20
VCC
-30
-40
QUAD
COIL
RD
8
0.0
100
1k
10k
100k
1M
f m , IF MODULATION FREQUENCY (HZ)
9 - 4. Filter Amplifer Section
INPUT LEVEL RESPONSE
GAIN vs. INPUT FREQUENCY
10
70
60
50
Vout , OUTPUT LEVEL(Vrms)
VCC = 4.0V
Vin = 0.3mV
R1 = 510Ω
Rf = 470kΩ
40
30
1µF
+
11
20
Rf
1µF
+
10
10
100
THD
VOUT
1
100m
VCC = 4.0V
Fin = 10kHz
R1 = 510Ω
Rf = 470kΩ
THD, TOTAL HARMONIC
DISTORTION(%)
Gf , FILTER AMPLIFIER GAIN (dB)
VCC =4.0V
fIF = 455kHz
VIF = +80dBµ
fdev = ±3kHz
Pin 9: open
10.0
1.0
R1
0
1k
10k
100k
1M
fin , FILTER AMPLIFIER INPUT
FREQUENCY (Hz)
10m
0.1
1
10
0.1
100
Vin , INPUT LEVEL(mVrms)
9 - 5. Squelch Section
SCAN CONTROL vs. SQUELCH
INPUT VOLTAGE
SC, SC, SCAN CONTROL(V)
4.0
SC
SC
3.5
3.0
2.5
2.0
1.5
1.0
VCC = 4.0V
0
.60
.65
.70
.75
.80
VSQ, SQUELCH INPUT VOLTAGE(V)
December 2000 TOKO, Inc.
Page 5
TK83361M
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
9 - 6. Versus Supply Voltage Characteristics
14
6.0
12
ICC2: sq off
5.0
10
SINAD
ICC1: sq on
4.0
8
3.0
6
2.0
4
1.0
2
0
0.0
1
2
3 4
5
6 7
8
VCC, SUPPLY VOLTAGE(V)
9
32
28
24
20
16
12
8
4
0
VO(DET), OUTPUT LEVEL(dBV)
16
7.0
0
-5
VCC = 8.5V
4.0V
2.0V
60
40
20
20
Page 6
40
60
80
100
VRF, RF INPUT SIGNAL
LEVEL(dBµ)
120
VO(DET)
-15
60
4
VO(DC)
-20
3
-25
2
50
40
30
20
THD
-30
-35
1
VTH, VTL , THRESHGf , FILTER
OLD VOLTAGE(V) AMP. GAIN(dB)
80
6
2
3 4
5
6 7
8
VCC, SUPPLY VOLTAGE(V)
9
1
10
0
0
FILT. AMP. GAIN, FILT. AMP. OUTPUT
DC VOLTAGE, THRESHOLD VOLTAGE,
HYSTERESIS vs. SUPPLY VOLTAGE
70
1.0
fOC
60
50
0.8
0.6
Gf
0.4
40
VTH
0.8
0.6
120
90
VTL
HYS
0.4
60
0.2
30
0.0
0
1
2
3 4
5
6
7
8
VCC, SUPPLY VOLTAGE(V)
HYS, SQUELCH
HYSTERESIS(mV)
VOM, MIXER OUTPUT LEVEL(dBµ)
100
70
fOC, OUTPUT
DC VOLTAGE
120
7
5
-10
MIXER OUTPUT LEVEL vs. SUPPLY
VOLTAGE
140
S/N
THD(%),VO(DC)(V)
ICC, SUPPLY CURRENT(mA)
8.0
36
OUTPUT LEVEL, TOTAL HARMONIC
DISTORTION, SIGNAL TO NOISE
RATIO, OUTPUT DC VOLTAGE vs.
SUPPLY VOLTAGE
S/N, SIGNAL TO NOISE RATIO (dB)
18
GM
GM, MIXER CONVERSION GAIN(dB)
9.0
SINAD, 12dB SINAD SENSITIVITY(dBµ)
SUPPLY CURRENT, 12dB SINAD
SENSITIVITY, MIXER CONVERSION
GAIN vs. SUPPLY VOLTAGE
9
December 2000 TOKO, Inc.
TK83361M
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
9 - 7. Versus Ambient Temperature Characteristics
14
6
12
5
SINAD
ICC2: sq off
10
8
4
6
3
ICC1: sq on
2
1
4
2
0
0
-40 -20
0 20 40 60 80 100
Ta, AMBIENT TEMPERATURE (°C)
32
28
24
20
16
12
8
4
0
VO(DET), OUTPUT LEVEL(dBV)
16
0
-5
S/N
-10
VO(DET)
-15
-20
VO(DC)
-25
-30
-35
THD
Gf , FILTER AMP.
GAIN(dB)
Ta = +25°C
+85°C
-40°C
60
40
20
20
40
60
80
100
VRF, RF INPUT SIGNAL
LEVEL(dBµ)
December 2000 TOKO, Inc.
120
VTH, VTL ,
THRESHOLD
VOLTAGE(V)
80
6
60
5
50
4
40
3
30
2
20
1
10
0
70
60
FILT. AMP. GAIN, FILT. AMP. OUTPUT DC VOLTAGE,
THRESHOLD VOLTAGE,
HYSTERESIS vs. AMBIENT TEMP.
Gf
0.8
0.6
50
40
VTH
fOC
0.8
0.6
0.5
120
VTL
90
60
0.4
0.2
1.0
HYS
30
0.0
0
fOC, OUTPUT DC HYS, SQUELCH
VOLTAGE(V) HYSTERESIS(mV)
VOM, MIXER OUTPUT LEVEL(dBµ)
140
100
70
0
-40 -20 0
20 40 60 80 100
Ta, AMBIENT TEMPERATURE(°C)
MIXER OUTPUT LEVEL vs.
AMBIENT TEMPERATURE
120
7
THD(%),VO(DC)(V)
ICC, SUPPLY CURRENT(mA)
GM
7
36
S/N, SIGNAL TO NOISE RATIO (dB)
8
OUTPUT LEVEL, TOTAL HARMONIC
DISTORTION, SIGNAL TO NOISE
RATIO, OUTPUT DC VOLTAGE vs.
AMBIENT TEMPERATURE
GM, MIXER CONVERSION GAIN(dB)
18
9
SINAD, 12dB SINAD SENSITIVITY(dBµ)
SUPPLY CURRENT, 12dB SINAD
SENSITIVITY, MIXER CONVERSION
GAIN vs. AMBIENT TEMPERATURE
-40 -20
0
20 40 60 80 100
Ta, AMBIENT TEMPERATURE(°C)
Page 7
TK83361M
PIN FUNCTION DESCRIPTION
PIN
SYMBOL
1
OSC(B)
2
OSC(E)
3
MIXER OUT
TERMINAL
VOLTAGE (V)
INTERNAL EQUIVALENT CIRCUIT
VCC
DESCRIPTION
The base of the Colpitts oscillator.
The Colpitts oscillator is composed of
Pin 1 and Pin 2.
1
4
The emitter of the Colpitts oscillator.
Using an external OSC source, local
level must be injected into Pin 1, and
Pin 2 must be opened.
2
Output of the Mixer.
VCC
4
VCC
Supply Voltage.
3
5
IF INPUT
6
DECOUPLE
7
DECOUPLE
Input to the IF limiter amplifier.
This pin is terminated by internal
1.8kW resistor.
VCC
5
1.8k
51.8K
50K
IF Decoupling
6
8
IF Decoupling.
QUAD COIL
7
Phase Shifter.
VCC
10p
8
9
Recovered Audio Output
AF OUTPUT
VCC
10p
9
Page 8
December 2000 TOKO, Inc.
TK83361M
PIN FUNCTION DESCRIPTION (CONT.)
PIN
10
SYMBOL
TERMINAL
VOLTAGE (V)
DESCRIPTION
INTERNAL EQUIVALENT CIRCUIT
Filter Amplifier Input.
VCC
FILTER
AMPLIFIER
INPUT
10
11
FILTER
AMPLIFIER
OUTPUT
Filter Amplifier Output.
VCC
11
12
13
Squelch Input.
SQUELCH
INPUT
VCC
SCAN
CONTROL
13
Scan Control.
14
12
20k
14
SCAN
CONTROL
15
GND
Scan Control.
Ground
VCC
16
3.3K
RF INPUT
Mixer Input.
3.3K
16
15
December 2000 TOKO, Inc.
Page 9
TK83361M
TEST BOARD
Figure 1: Solder Side View (Circuit Side View)
Figure 2: Component Placement View
NOTES:
1. Above test board is laid out for the TEST CIRCUIT (page 3).
2. Scale 1:1 (60mmx60mm)
3. 10.245MHz Fundamental mode crystal, about 30pF load.
4. 455kHz CF, TOKO Type BLFC455D or MURATA Type
CFU455D2 or equivalent.
5. COIL, TOKO Type 7MCS-13546Z or 7MC-8128Z or
equivalent.
APPLICATIONS INFORMATION
12-1. Mixer Section
The mixer consists of a Gilbert cell and a local oscillator. The mixer conversion gain, when Pin 4 is terminated, is 28dB.
The RF input is unbalanced.
12-1-1. A Local OSC
The oscillator included is a general Colpitts type OSC. The drive current of OSC is 200µA. Examples of components are
shown in Fig. 3. The examples are explained in the next paragraph.
Figure 3: Oscillator Components
i) Under Crystal Control
ii) Parallel LC Components
VCC
Page 10
VCC
1
1
2
2
December 2000 TOKO, Inc.
TK83361M
APPLICATIONS INFORMATION (CONT.)
(1) Using an External Oscillator Source
The circuit composition using an external OSC source is
shown in Fig. 4. When using an external OSC source
instead of the internal OSC, the local level must be injected
into Pin 1 by capacitor coupling.
In this case, Pin 2 must be open.
The local OSC operates as an emitter follower for a multiplier by opening Pin 2 and injecting into Pin 1.
tor. It is easy to increase the drive current by connecting
resistor Re between Pin 2 and GND. Being short of drive
current, it makes gm increase to increase the drive current
by connecting external resistor Re. In that case, the amount
of drive current increase, Ie, is shown in Eq.(1).
V
VBE
V
0.7
Ie = CC
= CC
Re
Re
Figure 4: External Injection
(1)
VCC
0.01µ
1
RF
~
50Ω
IF
2
open
(2) For 3rd Overtone mode
In general, a crystal oscillator can oscillate in the fundamental mode and overtone mode. For example, it is easy for a
30MHz-overtone crystal to oscillate at 10MHz, fundamental
mode. The reason is because the impedance of the fundamental mode is the same as the impedance of the overtone.
Therefore, it is necessary for the circuit to select the
overtone frequency by using a tuning coil.
How to oscillate a general 3rd overtone oscillator is explained. In the case of an overtone mode of 30MHz and
higher, using a crystal oscillator, we recommend the circuit
in Fig. 5 to suppress the fundamental mode oscillation.
Figure 5: Overtone Mode Circuit
VCC
In order to oscillate at the 3rd overtone frequency, the values
of C2, C3 and L (Fig.5) are selected. Fig.6 shows a 2-port
impedance response of the C2~C3~L loop network.
Regarding the condition of oscillation, the impedance characteristic is capacitive at the vacinity of the overtone frequency. It is reactive at the vicinity of the fundamental
frequency.
The condition of oscillation is as follows:
fOSC is between fa and fb,
3 x fOSC is fb and higher. Please see Fig.6
Figure 6: 2-port
Impedance Response of Resonance Network
+j
Reactance
50Ω
fOSC
fa
Where:
fa: series resonant freq.
fb: parallel resonant freq.
fOSC: fundamental mode freq.
3 x fOSC:
3rd order overtone freq.
fb
3 X f OSC
-j
Equations of 3rd order overtone oscillation are shown below.
fa =
1
2π LxC2
,
fb = fa
C
1+ 2
C3
(2)
The series value of the equivalent capacitance at the 3rd
1
order overtone freq. of this network, which is decided in the
above -mentioned, and the capacitance of C1 must be equal
C
C2
L
1
2
to load capacitance CL.
C3
Being short of negative resistance of the circuit, increase
the transistor’s bias current by decreasing Re. It is able to
Re
decide the OSC level for minute adjusting Re. Please refer
the most suitable OSC level range to 12dB SINAD sensitivity versus local OSC input signal level in TYPICAL PERThe following explains how to decide the circuit constants of FORMANCE CHARACTERISTICS. The saturating range
the overtone-crystal-oscillation fundamental circuit.
is the most suitable OSC level range. It is comparatively
As the operating frequency increases the oscillation ampli- easy to decide the circuit constant by examining it with a
tude decreases because of a shortage of gm of the oscilla- network analyzer.
X’tal
December 2000 TOKO, Inc.
Page 11
TK83361M
APPLICATIONS INFORMATION (CONT.)
12-2. IF Section
The IF section includes a 6 stage differential amplifier. The
fixed internal input matching resistor is 1.8kΩ. The total gain
of the limiting amplifier section is approximately 77dB.
The decoupling capacitors of Pin 6~7 must be connected as
near as possible to the GND pin of the IC . And, make the
impedance of the connecting-to-GND line to be as small as
possible. If the impedance is not small enough, the sensitivities may worsen.
Note at this point to add the bias voltage at Pin 8 from
external source.
The signal from the phase shifter is put into the multiplier cell
through the emitter follower of transistor Q1. Pin 8 is singleconnected with the base terminal. And, it is necessary for
Pin 8 to add the same voltage, as the base terminal of Q2 of
the opposite side of Q1 through the multiplier is connected
with the supply voltage.
If the base voltages differ between transistors Q1 and Q2, it
alters the DC zero point or worsens the distortion of the
demodulation output.
Figure 7: IF Limiter Amplifier Input Block
50K
5
1.8k
51.8K
6
7
12-3. FM Demodulator
A quadrature FM demodulator using a Gilbert cell is included.
12-3-1. Internal Equivalent Circuit
The internal equivalent circuit is shown in Fig. 8.
Figure 8: Internal Equivalent Circuit of Demodulator
VCC
QUAD
COIL
12-3-3. Audio Output
After quadrature detection, the audio signal is pulled out
through Pin 9.
The required signal is pulled out through the LPF.
12-3-4. For Stable Operation
To prevent worsening the distortion, observe the following
notes:
(1) Demodulated Output Voltage
Too large of a demodulated output voltage will worsen the
distortion due to the dynamic range of the demodulator.
(2) The Signal Level in Phase Shifter (Pin 8)
If the phase shifter signal level is too small, the noise level
grows worse. This will cause the distortion to grow worse.
(3) Band Width of Phase Shifter (Pin 8)
If the bandwidth of the phase shifter is narrower than IF
bandwidth, including the demodulated element, the distortion will grow worse.
RD
8
VCC
Active Load
VCC
Q2
Q1
from IF LIM AMP
Page 12
12-3-2. Phase Shifter
The IF signal from the limiter amplifier is provided with 90°
phase shift and drives the quadrature detector.
The parallel RCL resonance circuit is capable of using the
internal 10pF phase shift capacitor.
10pF
Multiplier
Cell
12-4. Filter Amplifier Section
An inverting op amp has an output at Pin 11 and the inverting
input at Pin 10. The op amp, which has a wide stable
operating temperature range, may be used as an active
noise filter.
12-4-1. Active BPF Application
An active BPF application is shown in Fig. 9, and its
Response is shown in Fig. 10.
December 2000 TOKO, Inc.
TK83361M
APPLICATIONS INFORMATION (CONT.)
VTH indicates the Hi threshold voltage, VTL indicates the Lo
threshold voltage in Fig. 11.
Figure 9. Active BPF
C
R1
12-6. Application Example
R3
+
R2
Figure 12: Application Example Block Digram
VOUT
XTAL
NETWORK
C
1
2
GND 15
NARROW
BAND
BPF
VIN ~
3
14
Figure 10. Frequency Response
RF
INPUT
16
MIXER
OSC
MUTE
VCC = 4.0V
Vin = 50mV
15
10
5
VCC
R1 = 18kΩ
R2 = 750Ω
R3 = 390kΩ
C = 0.001µF
0
4 VCC
SCAN CONTROL
to PLL
13
5
12
SQUELCH
0.1µF
6
LIMIT
AMP
0.1µF
R1 =
R3
R1R3
Q
, R2 =
, R3 =
πf 0C
2G0
4Q2R1-R3
(3)
12-5. Squelch Section
The output, which is controlled in accordance with the noise
level from the rectifier, is injected into the squelch input pin.
There is about 45mV of hysteresis at the Squelch Input to
prevent jitter.
Figure 11. Squelch Output versus Squelch Input
VTL
VTH
VSQ(V)
December 2000 TOKO, Inc.
ii) Pin 14 Output
Scan Control(V)
Scan Control(V)
i) Pin 13 Output
VTL
VTH
11
10
7
PHASE
SHIFTER
FILTER
AMP
NETWORK
1k
10k
100k
fin , FILTER AMPLIFIER INPUT FREQUENCY (Hz)
Eq. (3) is formularized, where G0 is the gain at center
frequency f0, and 3dB bandwidth Q=f0/BW.
RECTIFIER
GAIN (dB)
20
10pF
8
9
LPF
QUAD DET
AF
OUTPUT
12-7. Attentions to Layout Design
As this product is considered for stable operation, the mixer
block and the other block that includes IF stage, OP amp
and squelch are independent from each other. However in
order to realize stable operation, please pay attention to the
following, because of high frequency operation.
(1) Bypass Capacitor
A bypass capacitor must be connected with minimum
distance between the VCC pin and the GND pin.
(2) VCC/GND Pattern
In order to make low impedance VCC/GND lines, please
keep the pattern as wide as possible.
(3) Pattern near Demodulator
Pattern layout around the phase shifter for demodulator:
please keep as short as possible.
VSQ(V)
Page 13
TK83361M
NOTES
WARNING - Life support applications policy.
TOKO, Inc. products shall not be used within any life support systems without the specific written consent of TOKO, Inc.
A life support system is a product or system intended to support or sustain life which, if it fails, can be reasonably expected
to result in a significant personal injury or death.
The contents of this application as of December 2000. The contents of this datasheet are subject to change without notice
or stop manufacture.
The circuits shown in this specification are intended to explain typical applications of the products concerned. Accordingly,
TOKO, Inc. is not responsible for any circuit problems, or for any infringement of third party patents or any other intellectual
property rights that may arise from the use of these circuits. Moreover, this specification dose not signify that TOKO, Inc.
agrees implicitly or explicitly to license any patent rights or other intellectual property rights which it holds.
No Ozone Depleting Substances (ODS) were used in the manufacture of these parts.
Examples of characteristics given here are typical for each product and being technical data, these do not constitute a
guarantee of characteristics or conditions of use.
Page 14
December 2000 TOKO, Inc.
TK83361M
PACKAGE OUTLINE
Marking Information
SOP-16
Marking
0.76
83361
Mark
1.27
TOKO Mark
TK83361M
9
3.9±0.2
5.4
16
YYY
1.27
1
8
Recommended Mount Pad
Lot No.
1.27
0 ~ 10
1.75 max
+0.15
0.1
0.5±0.2
0.2 -0.05
+0.15
0.4 -0.05
±0.2
0 ~ 0.25 1.45
9.9±0.2
0.12 M
Dimensions are shown in millimeters
Tolerance: x.x = ± 0.2 mm (unless otherwise specified)
6.0±0.3
Toko America, Inc. Headquarters
1250 Feehanville Drive, Mount Prospect, Illinois 60056
Tel: (847) 297-0070 Fax: (847) 699-7864
TOKO AMERICA REGIONAL OFFICES
Midwest Regional Office
Toko America, Inc.
1250 Feehanville Drive
Mount Prospect, IL 60056
Tel: (847) 297-0070
Fax: (847) 699-7864
Western Regional Office
Toko America, Inc.
2480 North First Street , Suite 260
San Jose, CA 95131
Tel: (408) 432-8281
Fax: (408) 943-9790
Semiconductor Technical Support
Toko Design Center
4755 Forge Road
Colorado Springs, CO 80907
Tel: (719) 528-2200
Fax: (719) 528-2375
Visit our Internet site at http://www.tokoam.com
The information furnished by TOKO, Inc. is believed to be accurate and reliable. However, TOKO reserves the right to make changes or improvements in the design, specification or manufacture of
its products without further notice. TOKO does not assume any liability arising from the application or use of any product or circuit described herein, nor for any infringements of patents or other rights
of third parties which may result from the use of its products. No license is granted by implication or otherwise under any patent or patent rights of TOKO, Inc.
December 2000 TOKO, Inc.
© 2000 Toko, Inc.
All Rights Reserved
Page 15
IC-231-TK11031
0798O0.0K
Printed in the USA