Datasheet TK83361MTL Datasheet (TOKO)

TK83361M

NARROW BAND FM IF IC

FEATURES

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,

squelch on)

n Low External Component Count n Excellent Limiting Sensitivity (-3dB = 8dB

µµ

µ)

µµ

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.

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.

APPLICATIONS

n Amateur Radio Transceivers n Cordless Phones n Remote Controls n Wireless Data Transceivers n Battery Powered Devices

TK83361M

1

OSC (B)

2

OSC (E)

3

MIXER OUT

4

VCC

5

IF INPUT

6

DECOUPLE

7

DECOUPLE

89

QUAD COIL

16

RF INPUT

15

GND

14

SCAN CONTROL

13

SCAN CONTROL

12

SQUELCH INPUT

FILTER AMP

11

OUTPUT

10

FILTER AMP INPUT

AF OUTPUT

BLOCK DIAGRAM

ORDERING INFORMATION

TK83361M

Tape/Reel Code

TAPE/REEL CODE

TL: Tape Left

MIXER OUT

DECOUPLE

QUAD COIL

1

OSC (B)

OSC (E)

IF INPUT

OSC

2

3

SQUELCH

VCC

4

VCC

5

6

LIMIT

AMP

7

10pF

89

QUAL DET

MIXER

FILTER

AMP

GND

16

15

14

13

12

11

10

RF INPUT

GND

SCAN CONTROL

SQUELCH INPUT

FILTER AMP OUTPUT

FILTER AMP INPUT

AF OUTPUT

December 2000 TOKO, Inc. Page 1

TK83361M

ABSOLUTE MAXIMUM RATINGS

Supply Voltage ........................................................ 10 V

Operating Voltage......................................... 2.0 to 8.0 V

Power Dissipation (Note 1) ................................ 600 mW

TK83361M ELECTRICAL CHARACTERISTICS

Test Conditions: V

LOBMYSRETEMARAPSNOITIDNOCTSETNIMPYTXAMSTINU

4.0 V, fRF = 10.7 MHz, VRF = +80dBµ, fm = 1kHz, f

CC =

unless otherwise specified.

Storage Temperature Range................... -55 to +150 °C

Operating Temperature Range.................. -30 to +70 °C

Input Frequency ............................................... 220 MHz

= ±3kHz, f

dev

= 10.245MHz, Ta = 25°C,

OSC

I

1CC

I

2CC

L

timi

V

O

Z

O

DHTnoitrotsiDcinomraHlatoTV

G

M

R

MI

G

f

CO

S

H

S

L

S

H

1tnerruCylppuSffohcleuqS,langiSoN8.25.3Am 2tnerruCylppuSnohcleuqS,langiSoN8.39.4Am

ytivitisneSgnitimiLBd3-)zHk1(.tpBd3-851µBd

egatloVtuptuOV

ecnadepmItuptuOV

FR

Bd08+= µ f, Bd08+= µ f, Bd08+= µ f,

ved

zHk3±=031071smrVm zHk3±=054

zHk3±=68.05.2% niaGnoisrevnoCrexiMdetanimret:3niP1282Bd ecnadepmItupnIrexiMtnemerusaeMCD3.3kΩ

niaGreifilpmAretliFf

ni

tuptuOreifilpmAretliF

egatloVlanimreT

leveLhgiHlortnoCnacSVtupnIhcleuqS

leveLwoLlortnoCnacSVtupnIhcleuqS

leveLhgiHlortnoCnacSVtupnIhcleuqS

V,zHk01=

ni

Vm3.0=0405Bd

langiSoN5.07.09.0V

V0.0=0.39.3V

QS

V5.2=0.04.0V

QS

V5.2=0.39.3V

QS

Ω

S

L

H

SY

Note 1: Power dissipation must be decreased at a rate of 4.8 mW/°C for operation above 25°C.

leveLwoLlortnoCnacSVtupnIhcleuqS

V0.0=0.04.0V

QS

siseretsyHhcleuqS 54001Vm

Page 2 December 2000 TOKO, Inc.

TEST CIRCUIT

(

)

V

O(DET)

, AMR, N, THD vs.

RF INPUT SIGNAL LEVEL

VIF, IF INPUT SIGNAL LEVEL (dBµ)

-20 ±0 +20 +40 +60 +80 +100 +120

V

O(DET)

, Output Level, AMR, AM

REJECTION AND N, NOISE (dBV)

-10

-20

-30

-40

-50

-60

-70

-80

Vcc=4.0V fIF=455kHz fm=1kHz, f

dev

=±3kHz

0.0

1.0

2.0

3.0

4.0

5.0

6.0

7.0

N

THD

AMR (MOD.=30%)

V

O(DET)

THD, TOTAL HARMONIC

DISTORTION(%)

TK83361M

CF = BLFC455D (TOKO) CFU455D2 (MURATA) QUAD COIL = 7MCS-13546Z

9 - 1. Mixer + IF Section

V

O(DET

-10

-20

-30

-40

-50

RF INPUT SIGNAL LEVEL

10µF

0.1µF

QUAD

COIL

10.245MHz

33pF

+

120pF

VCC

0.1µF

20kΩ

1

MIXER

OSC

2

3

CF

SQUELCH

VCC

4

5

6

FILTER

LIMIT

AMP

7

10pF

89

QUAD DET

GND

0.01µF

16

50Ω

15

14

13

12

11

10

100kΩ

10kΩ

470kΩ

510Ω

8.2kΩ

1µF

+

1µF

+

0.01µF

VCC

TYPICAL PERFORMANCE CHARACTERISTICS

), AMR, N, THD vs.

7.0

Vcc=4.0V fRF=10.7MHz fm=1kHz, f

dev

f

=10.245MHz

OSC

AMR(mod=30%)

V

O(DET)

=±3kHz

THD, TOTAL HARMONIC

6.0

DISTORTION(%)

5.0

4.0

3.0

-60

), OUTPUT LEVEL, AMR, AM

-70

REJECTION AND N, NOISE (dBV)

O(DET

-80

V

-20 ±0 +20 +40 +60 +80 +100 +120 VRF, RF INPUT SIGNAL LEVEL (dBµ)

4.0

3.5

3.0

2.5

2.0

LEVEL (V)

1.5

1.0

0.5

SUPPLY VOLTAGE, OUTPUT

0.0

-0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0

December 2000 TOKO, Inc. Page 3

THD

TRANSIENT RESPONSE

fRF = 10.7MHz

τR, RISE TIME (msec)

fm = 1kHz f

= ±3kHz

dev

f

= 10.245MHz

OSC

V

= ±0dBm

OSC

2.0

1.0

N

0.0

V

1kHz±3kHz Non-mod

CC

20dB NQS vs. RF INPUT

FREQUENCY

0

20dB NQS = 17.5dBµ

-20

fRF = 10.7MHz f

= 10.245MHz

OSC

-40

-60 0

20dB NQS = 18.0dBµ

RELATIVE 20dB NQ

SENSITIVITY(dB)

-20

fRF = 58MHz f

= 58.545MHz

OSC

-40

-60

-20 -15 -10 -5 ±0 +5 +10 +15 +20 fRF±∆fRF, RF INPUT

FREQUENCY

kHz

TK83361M

SINAD, GM S/N vs. LOCAL OSC

INPUT SIGNAL LEVEL

V

OSC

, LOCAL OSC INPUT SIGNAL

LEVEL (dBµ)

-70 -60 -50 -40 -30 -20 -10 0 10 20

SINAD, 12dB SINAD SENSITIVITY

(dBµ) S/N, signal to noise ratio (dB)

60

50

40

30

20

0

10

35

30

25

20

15

10

0

G

M

fRF = 10.7MHz 21MHz

58MHz 83MHz

S/N

SINAD

G

M

, MIXER CONVERSION

GAIN(dB)

µ

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

9 - 2. Mixer Section

32

30

28

(dB)

26

VCC = 4.0V fRF VARIABLE VRF = +60dBµ

24

, MIXER CONVERSION GAIN G

fOM = 455kHz V

M

22

1M 10M 100M 1G

fRF, RF INPUT FREQUENCY (Hz)

THE 3rd ORDER INTERCEPT

140

120

1st ORDER DESIRED fRF = 10.7MHz

100

MIXER INPUT FREQUENCY

RESPONSE

= ±0dBm

OSC

POINT

IIP3 = 107dBµ

MIXER OUTPUT FREQUENCY

0

RESPONSE

-2

-4

-6

-8

-10

-12

VCC = 4.0V

LEVEL (dB)

fRF = 10.7MHz

-14

, RELATIVE MIXER OUTPUT

OMR

V

VRF = +60dBµ

-16

f

VARIABLE

OSC

V

= ±0dBm

OSC

-18

-20 100k 1M 10M

fOM, MIXER OUTPUT FREQUENCY

(Hz)

80

(dBµ)

60

, MIXER OUTPUT LEVEL

3rd ORDER INTERMOD

40

f

RF1

OM

f

V

20

RF2

20 40 60 80 100 120

VRF, RF INPUT SIGNAL LEVEL

9 - 3. IF Section

OUTPUT LEVEL, TOTAL HARMONIC

DISTORTION vs. IF INPUT FREQUENCY

-10

-20

-30

-40

, OUTPUT LEVEL(dBV)

-50

O(DET)

V

-60

-40 -30 -20 -10 ±0 +10 +20 +30 +40 455±∆fIF, IF INPUT FREQUENCY (kHz)

Page 4 December 2000 TOKO, Inc.

= 10.7125MHz = 10.725MHz

V

O(DET)

(dB

)

VCC = 4.0V VIF = ±80dBµ fm = 1kHz f

=±3kHz

dev

THD

10.0

8.0 DISTORTION(%)

6.0

4.0

2.0

0.0

THD, TOTAL HARMONIC

OUTPUT DC VOLTAGE vs.

IF INPUT FREQUENCY

4.0

3.5

3.0

VCC = 4.0V VIF = +80dBµ

2.5

2.0

V

1.5

1.0

, OUTPUT DC VOLTAGE (V)

.5

O(DC)

V

0

CC

QUAD

R

D

COIL

8

-80 -60 -40 -20 ±0 +20 +40 +60 +80 455±∆fIF, IF INPUT FREQUENCY (kHz)

RD = 5kΩ RD = 10kΩ

RD = 20kΩ

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

(

)

THD

TOTAL

HARMONIC

OUTPUT LEVEL, TOTAL HARMONIC

DISTORTION vs. IF DEVIATION

600

VCC =4.0V

500

fIF = 455kHz VIF = +80dBµ fm = 1kHz

400

300

200

V

, OUTPUT LEVEL(mVrms)

O(DET)

100

O(DET)

V

0

0 1 2 3 4 5 6 7 8 9 10

f

dev.

9 - 4. Filter Amplifer Section

GAIN vs. INPUT FREQUENCY

70

60 50

40

30 20

10

, FILTER AMPLIFIER GAIN (dB)

f

G

0

1k 10k 100k 1M

9 - 5. Squelch Section

SCAN CONTROL vs. SQUELCH

4.0

SC

3.5

FREQUENCY

, IF DEVIATION FREQUENCY

kHz

11

R

f

10

R

1

fin, FILTER AMPLIFIER INPUT

FREQUENCY (Hz)

INPUT VOLT AGE

TK83361M

OUTPUT LEVEL vs. IF MODULATION

THD

6.0

5.0

4.0

3.0

2.0

1.0

THD, T O TAL HARMONIC

DISTORTION(%)

RD =

20kΩ

±0

10kΩ

-10

5kΩ

-20

, RELATIVE OUTPUT

LEVEL (dB)

-30

VCC =4.0V fIF = 455kHz

-40

VIF = +80dBµ f

dev

Pin 9: open

O(DET)R

V

0.0

100 1k 10k 100k 1M

fm, IF MODULATION FREQUENCY (HZ)

10

VCC = 4.0V Vin = 0.3mV R1 = 510Ω Rf = 470kΩ

1

1µF +

100m

, OUTPUT LEVEL(Vrms)

out

V

10m

0.1 1 10 100

SC

FREQUENCY

V

CC

QUAD COIL

8

= ±3kHz

R

D

INPUT LEVEL RESPONSE

THD

V

VCC = 4.0V Fin = 10kHz R1 = 510Ω Rf = 470kΩ

Vin, INPUT LEVEL(mVrms)

OUT

100

10.0

1.0

0.1

DISTORTION(%)

,

3.0

2.5

2.0

1.5

1.0

SC, SC, SCAN CONTROL(V)

0

.60 .65 .70 .75 .80

VSQ, SQUELCH INPUT VOLTAGE(V)

VCC = 4.0V

December 2000 TOKO, Inc. Page 5

TK83361M

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

9 - 6. Versus Supply Voltage Characteristics

SUPPLY CURRENT, 12dB SINAD

SENSITIVITY, MIXER CONVERSION

GAIN vs. SUPPLY VOLTAGE

I

: sq off

CC2

SINAD

I

: sq on

CC1

1 2 3 4 5 6 7 8 9

VCC, SUPPLY VOLTAGE(V)

MIXER OUTPUT LEVEL vs. SUPPLY

VOLT AGE

80

60

VCC = 8.5V

4.0V

2.0V

40

20

20 40 60 80 100 120

VRF, RF INPUT SIGNAL

LEVEL(dBµ)

G

M

, MIXER OUTPUT LEVEL(dBµ) V

, SUPPLY CURRENT(mA)

CC

I

140

120

100

OM

9.0

8.0

7.0

6.0

5.0

4.0

3.0

2.0

1.0

0.0

18 16

14 12 10

OUTPUT LEVEL, TOTAL HARMONIC

DISTORTION, SIGNAL TO NOISE

SINAD, 12dB SINAD SENSITIVITY(dBµ)

36 32

G

M

, MIXER CONVERSION GAIN(dB)

28

24

20 8 6

4 2

0

16

12

8

4

0

RATIO, OUTPUT DC VOLTAGE vs.

0

SUPPLY VOL TAGE

-5

-10

V

O(DET)

-15

-20

), OUTPUT LEVEL(dBV)

-25

-30

O(DET

V

-35 1 2 3 4 5 6 7 8 9

S/N

V

O(DC)

THD

7 6

THD(%),V

5 4

O(DC)

3

(V)

2

1 0

60

50 40

30

20 10

0

70

S/N, SIGNAL TO NOISE RATIO (dB)

VCC, SUPPLY VOLTAGE(V)

FILT. AMP. GAIN, FILT. AMP. OUTPUT

DC VOLT AGE, THRESHOLD V OLT AGE,

HYSTERESIS vs. SUPPLY VOLTAGE

70 60

G

50

, FILTER

f

G

, THRESH-

TL

, V

TH

V

f

40

AMP. GAIN(dB)

0.8

0.6

V

TH

V

TL

0.4

0.2

OLD VOLTAGE(V)

0.0 1 2 3 4 5 6 7 8 9

HYS

1.0

f

DC VOL TAGE

OC

f

OC

0.8

, OUTPUT

0.6

0.4

HYSTERESIS(mV)

HYS, SQUELCH

120

90 60 30

0

VCC, SUPPLY VOLTAGE(V)

Page 6 December 2000 TOKO, Inc.

TK83361M

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

9 - 7. Versus Ambient Temperature Characteristics

SUPPLY CURRENT, 12dB SINAD SENSITIVITY, MIXER CONVERSION GAIN vs. AMBIENT TEMPERATURE

9 8 7

6 5

4

I

CC2

: sq off

3

I

, SUPPLY CURRENT(mA) I

CC

2 1

CC1

0

-40 -20 0 20 40 60 80 100 Ta, AMBIENT TEMPERATURE (°C)

MIXER OUTPUT LEVEL vs.

AMBIENT TEMPERA TURE

140

120

100

, MIXER OUTPUT LEVEL(dBµ)

OM

V

80

60

40

20

Ta = +25°C

+85°C

-40°C

20 40 60 80 100 120

VRF, RF INPUT SIGNAL

LEVEL(dBµ)

SINAD

: sq on

G

M

18 16

14 12 10

SINAD, 12dB SINAD SENSITIVITY(dBµ)

16

8 6 4 2 0

36 32

28 24

20

12 8

4 0

OUTPUT LEVEL, TOTAL HARMONIC

DISTORTION, SIGNAL TO NOISE

RATIO, OUTPUT DC VOLTAGE vs.

G

M

, MIXER CONVERSION GAIN(dB)

-5

-10

-15

AMBIENT TEMPERA TURE

0

V

O(DET)

S/N

7 6

THD(%),V

5 4

60

50 40

70

S/N, SIGNAL TO NOISE RATIO (dB)

O(DC)

30

O(DC)

THD

3

(V)

20

2

10

1

0

-20

, OUTPUT LEVEL(dBV)

-25

-30

O(DET)

V

-35

-40 -20 0 20 40 60 80 100

V

Ta, AMBIENT TEMPERATURE(°C)

FILT. AMP. GAIN, FILT. AMP. OUT-

PUT DC VOLTAGE,

THRESHOLD VOLTAGE,

, , V

V

TL

TH

HYSTERESIS vs. AMBIENT TEMP.

70

60

G

f

50

40

0.8

0.6

V

TH

V

TL

GAIN(dB)

, FILTER AMP.

f

G

0.4

0.2

VOLTAGE(V)

THRESHOLD

0.0

-40 -20 0 20 40 60 80 100

f

OC

HYS

1.0

0.8

0.6

0.5

120

90 60 30

0

f

OC

VOLTAGE(V)

, OUTPUT DC

HYSTERESIS(mV)

HYS, SQUELCH

Ta, AMBIENT TEMPERATURE(°C)

December 2000 TOKO, Inc. Page 7

TK83361M

PIN FUNCTION DESCRIPTION

1

SYMBOL

OSC(B) The base of the Colpitts oscillator.

TERMINAL

VOLTAGE (V)

INTERNAL EQUIVALENT CIRCUIT

V

CC

DESCRIPTION

The Colpitts oscillator is composed of Pin 1 and Pin 2.

1

2 OSC(E)

2

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.

3 Output of the Mixer.

MIXER OUT

4

V

CC

5

IF INPUT Input to the IF limiter amplifier.

V

CC

V

CC

4

3

Supply Voltage.

This pin is terminated by internal

1.8kW resistor. IF Decoupling.

6

DECOUPLE

5

1.8k

51.8K 50K

7

8

9

DECOUPLE

QUAD COIL

AF OUTPUT

10p

6

7

V

CC

8

V

CC

9

IF Decoupling

Phase Shifter.

Recovered Audio Output

Page 8 December 2000 TOKO, Inc.

PIN FUNCTION DESCRIPTION (CONT.)

TK83361M

10

11

SYMBOL

FILTER AMPLIFIER INPUT

FILTER AMPLIFIER OUTPUT

TERMINAL

VOLTAGE (V)

INTERNAL EQUIVALENT CIRCUIT

V

CC

10

V

CC

11

DESCRIPTION

Filter Amplifier Input.

Filter Amplifier Output.

12

13

14

15

SQUELCH INPUT

SCAN

V

CC

13

Squelch Input.

Scan Control.

CONTROL

14

Scan Control.

SCAN

12

20k

CONTROL

GND

V

CC

3.3K

Ground

RF INPUT16 Mixer Input.

16

15

3.3K

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

V

CC

1

ii) Parallel LC Components

V

CC

1

2

Page 10 December 2000 TOKO, Inc.

2

APPLICATIONS INFORMATION (CONT.)

C

(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.

Figure 4: External Injection

V

CC

TK83361M

tor. It is easy to increase the drive current by connecting resistor R 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).

between Pin 2 and GND. Being short of drive

e

Ie =

V

CC

V

Re

BE

V

=

CC

Re

0.7 (1)

50Ω

~

0.01µ

50Ω

open

1

2

RF

IF

(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

V

CC

In order to oscillate at the 3

rd

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: f

is between fa and fb,

OSC

3 x f

is fb and higher. Please see Fig.6

OSC

Figure 6: 2-port

Impedance Response of Resonance Network

+j

f

OSC

f

a

f

b

Where: fa: series resonant freq. fb: parallel resonant freq.

Reactance

-j

3 X f

OS

f

: fundamental mode freq.

OSC

3 x f

OSC

:

3rd order overtone freq.

Equations of 3rd order overtone oscillation are shown below.

fa =

1

2π LxC

,

fb =f

2

C

2

1+

a

C

3

(2)

X’tal

1

C

L

2

C

3

C

1

2

The series value of the equivalent capacitance at the 3 order overtone freq. of this network, which is decided in the above -mentioned, and the capacitance of C1 must be equal to load capacitance CL. Being short of negative resistance of the circuit, increase the transistor’s bias current by decreasing Re. It is able to

R

e

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 PER-

The following explains how to decide the circuit constants of the overtone-crystal-oscillation fundamental circuit. As the operating frequency increases the oscillation amplitude decreases because of a shortage of gm of the oscilla-

FORMANCE CHARACTERISTICS. The saturating range is the most suitable OSC level range. It is comparatively easy to decide the circuit constant by examining it with a network analyzer.

December 2000 TOKO, Inc. Page 11

rd

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.

Figure 7: IF Limiter Amplifier Input Block

5

1.8k

6

7

50K

51.8K

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

V

CC

QUAD

COIL

from IF LIM AMP

10pF

R

D

8

V

CC

Q

1

Active Load

V

CC

Q

2

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.

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.

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.

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.

Multiplier

Cell

12-4-1. Active BPF Application

An active BPF application is shown in Fig. 9, and its Response is shown in Fig. 10.

Page 12 December 2000 TOKO, Inc.

APPLICATIONS INFORMATION (CONT.)

R

H

LPF

NETWORK

RECTIFIER

XTAL

NETWORK

1

2

3

4

5

6

7

89

10

11

12

13

14

15

16

RF

INPUT

SCAN CONTROL

to PLL

VCC

OSC

MIXER

LIMIT

AMP

10pF

QUAD DET

VCC

SQUELCH

GND

FILTER

AMP

NARROW

BAND

BPF

PHASE

SHIFTER

0.1µF

AF

OUTPUT

MUTE

Figure 9. Active BPF

TK83361M

VTH indicates the Hi threshold voltage, VTL indicates the Lo threshold voltage in Fig. 11.

C

R

1

V

~

IN

C

R

2

3

-

+

V

OUT

Figure 10. Frequency Response

20

VCC = 4.0V

15

Vin = 50mV

10

GAIN (dB)

5

0

1k 10k 100k

fin, FILTER AMPLIFIER INPUT FREQUENCY (Hz)

R1 = 18kΩ R2 = 750Ω R3 = 390kΩ C = 0.001µF

Eq. (3) is formularized, where G0 is the gain at center frequency f0, and 3dB bandwidth Q=f0/BW.

R1R

3

4Q2R1-R

3

2G

3

0

R1 = , R2 = , R3 = (3)

Q

πf0C

12-6. Application Example

Figure 12: Application Example Block Digram

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.

VSQ(V)

V

TL

V

T

Figure 11. Squelch Output versus Squelch Input

December 2000 TOKO, Inc. Page 13

i) Pin 13 Output

Scan Control(V)

V

TL

VSQ(V)

V

ii) Pin 14 Output

Scan Control(V)

TH

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.

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.

PACKAGE OUTLINE

TK83361M

SOP-16

TOKO Mark

16

1

+0.15

0.4

-0.05

0.12

Marking Information

0.76

Mark

9

±0.2

YYY

Lot No.

±0.2

9.9

1.27

0.1

M

3.9

8

±0.2

1.45

1.75 max

0 ~ 0.25

1.27

Recommended Mount Pad

±0.2

0.5

0 ~ 10

+0.15

0.2

5.4

-0.05

Marking

TK83361M 83361

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. Page 15

IC-231-TK11031

0798O0.0K