INTEGRATED CIRCUIT
OW SUFFIX PLASTIC PACKAGE
CASE 751F SO-28
PIN CONNECTIONS
Mixer Dcpl. 2nd IF Amp In
Mixer Out Data Buffer Out
Mixer In Data Buffer In Osc. Dcpl. 1st IF Amp Out
Osc. Base VCC3
Osc. Emit. 1st IF Amp In Isrc Dcpl. Audio Buffer Out
IF Gnd Audio Buffer In
VCC2 Low Battery Det.
Rec. Audio 1.2 V Select
Quad Tank VCC
Quad Tank Vreg
Demod. Gnd Receiver Enable
Comparator I/P..".J.;.; _ _ -,-' Comparator O/P
MOTOROLA COMMUNICATIONS DEVICE DATA
ABSOLUTE MAXIMUM RATINGS (Voltages referred to Pin 12; TA = 25'C)
Parameter Pin Value Units
Supply Voltage 18 5.0 Vdc
RF Input Signal 3 1.0 Vrms
Audio Buffer Input 21 1.0 Vrms
Data Buffer Input 26 1.0 Vrms
Comparator Input 14 1.0 Vrms
Junction Temperature - 150
'c
Storage Temperature
-
-65 to +150'c
Devices should not be operated at or outside these values. The "Recommended Operating Limits"
provide for actual device operation.
RECOMMENDED OPERATING CONDITIONS
Parameter Pin
Supply Voltage 18
Receiver Enable Voltage 16
1.2 V Select Voltage 19
RF Input Signal 3
RF Input Frequency 3
Intermediate Frequency (IF)
-Audio Buffer Input 21
Data Buffer Input 26
Comparator Input 14
Ambient Temperature
-FIGURE 2 - TEST CIRCUIT
Value Units
1.1 to 3.0 Vdc
o
or VCC VdcVCC Vdc
0.001 to 100 mVrms
o
to 75 MHz455 kHz
o
to 75 mVrmso
to 75 mVrms10 to 300 mVrms
o
to 70'c
(All capacitors in p.F unless otherwise stated. Resistors in ohms. Inductors in Henries.)
28 FLl = FL2 =
Toko LFC-455FII
2 27 or
muRata CFU 455D/E/F
3 26
4 25
5 330
24
6 23 ~0.1
7 22
0.1~
8 21
20 100 k 9
1.0
T
10 19Cp = 180 P "::"
11 18
56 k + VCC
12 17
~1.0 Toko RMC
2A 6597HM 13
14
MOTOROLA COMMUNICATIONS DEVICE DATA
16 15
100 k
MC3367 2-73
ELECTRICAL CHARACTERISTICS (Vcc ~ 1.3 V, fo ~ 45 MHz, fmod ~ 1.0 kHz, Deviation ~ 3.0 kHz, TA ~ 25°C, Test Circuit of Figure 2 unless otherwise noted)
Characteristic
I
PinI
Min Typ MaxOVERALL MC3367 PERFORMANCE
Drain Current - Pin 15 ~ VCC - - 1.4 3.0
-Pin 15 ~ OVdc - - 0.5
-Recovered Audio (RF Input ~ 10 mY) 10 - 13
-Noise Output (RF Input ~ 0 mY) 10 - 4.5
-Input for -3.0 dB Limiting 3 - 0.2
-MIXER
Mixer Input Resistance (Rp) Mixer Input Capacitance (Cp) FIRST IF AMPLIFIER
I
First IF Amp Voltage Gain 25AUDIO BUFFER
Voltage Gain - - 4.0
-Input Resistance 21 - 125
-Maximum Input for Undistorted Output 21 - 70
-Maximum Output Swing 22 - 800
-Output Resistance 22 - 680
-DATA BUFFER
Voltage Gain - - 3.2
-Input Resistance 26 - 8.0
-Maximum Input for Undistorted Output 26 - 70
-Maximum Output Swing 27 - 600
-Output Resistance 27 - 1.5
-COMPARATOR
Minimum Input for Triggering 14 - 7.0
-Maximum Input Frequency (RL ~ 100 k(1) 14 - 25
-Rise Time (10-90%; RL ~ 100 k!1) 15 - 5.0
-Fall Time (90-10%; RL ~ 100 k!1) 15 - 0.4
-LOW BATTERY DETECTOR
Low Battery Trip Point 18. - 1.09
-Low Battery Output - VCC ~ 0.9 V 20 - 0.2
--VCC ~ 1.3 V 20 - VCC
-VOLTAGE REGULATOR Regulated Output (see Figure 6) Source Capability
Units
mA fLA mVrms mVrms fLVrms
dB
VN k!1 mVrms
mVpp
!1
VN M!1 mVrms
mVpp k!1
mVrms kHZ
fLs fLS
Vdc Vdc Vdc
MC3367 2-74
MOTOROLA COMMUNICATIONS DEVICE DATA
80
FIGURE 3 - RECOVERED AUDIO versus SUPPLY
---t>-h ~1.0~
low power drain and excellent sensitivity in narrowband voice and data link applications. In the typical applica-tion the mixer amplifies the incoming RF or IF signal and converts the RF or IF frequency to 455 kHz. This signal is then filtered by a 455 ceramic filter and applied to the first intermediate frequency (IF) amplifier input.This amplifier amplifies the 455 kHz IF before it is filtered by a second ceramic filter. The modulated IF signal is then applied to the limiting IF amplifier and detector circuitry. Audio is recovered by a conventional quad-rature detector.
Features available include buffers for audio/data amplification and active filtering, on board voltage reg-ulator, low battery detection circuitry with program-mable level, and receiver disable circuitry. The MC3367 is an FM utility receiver to be used for voice and/or narrowband data reception, especially suitable where extremely low power consumption and high design flexibility are required.
MOTOROLA COMMUNICATIONS DEVICE DATA
FIGURE 4 - DRAIN versus SUPPLY
1600
Because of the MC3367's extremely good sensitivity (0.6/LV for 20 dB (S
+
N)/N, see Figure 5), it can also be used as a stand alone single conversion narrow-band receiver to 75 MHz for applications not sensitive to image frequency interference.The oscillator is a Colpitts type which can be run as an LC oscillator or under crystal control. The crystal in Figure 2 is a 3rd overtone series mode type, and the 1.2 /LH coil (L1) and 1.0 kG resistor are needed to ensure proper operation. For fundamental mode crys-tals, the inductor L 1 can be omitted.
The best adjacent channel and sensitivity response occur when two 455 kHz ceramic filters are used, as shown in Figure 2. Either can be replaced by a 0.1 /LF coupling capacitor to reduce cost, but some degrada-tion in sensitivity and/or stability is suspected.
The detector is a quadrature type, with the connec-tion from the limiter output to the detector input pro-vided internally as with the MC3359 and the MC3361.
MC3367 2-75
~i:
atO
~
s:: o
d ~
>
8 s::
s:: c z
(') (5 ~z en c
m<
(') m
?i c
»
2 23
3~
40 .~
5
6 0
'1
70
80
l $
13~ I
180
19
24 25 28
FIGURE 7 - CIRCUIT SCHEMATIC
100 k
20 16 14 9
100 k
11 12 17
13.7 k
11 k
15 26 27 21 22
A 455 kHz LC tank circuit must be provided externally.
One of the tank pins (Pin 11) must be decoupled using a 0.1 /LF capacitor. The 56 kG damping resistor shown in Figure 2 determines the peak separation (and thus the detector bandwidth) of the detector. Smaller val-ues will increase the separation and bandwidth but decrease recovered audio and sensitivity.
The data buffer is a non-inverting amplifier with a nominal voltage gain of 3.2 VN. This buffer needs its dc bias (approx. 250 mV) provided externally or else debiasing will occur. A single-pole RC filter as shown in Figure 5 connecting the recovered audio output to the data buffer input provides the necessary dc bias and some post-detection filtering. The buffer can also be used as an active filter.
The audio buffer is a non-inverting amplifier with a nominal voltage gain of 4.0 VN. This buffer is self-biasing so its input should be ac coupled. The two buffers, when used as active filters, can be used together to allow simultaneous audio and very low-speed data reception. Another possible configuration is to receive audio only and include a noise-triggered squelch.
The comparator is a non-inverting type with an open collector output. Typically the pull-up resistor used between Pin 15 and VCC is 100 kG. With RL = 100 kG
MOTOROLA COMMUNICATIONS DEVICE DATA
the comparator is capable of operation up to 25 kHz.
This circuit is self-biasing, so its input should be ac coupled.
The regulator is a 0.95 V reference capable of sourcing 3.0 mAo This pin (pin 17) needs to be decoupled using a 1.0-10 /LF capacitor to maintain stability of the MC3367.
All three VCC's on the MC3367 (Vce. VCC2. VCC3) run on the same supply voltage. Vce is typically decoupled using capacitors only. VCC2 and VCC3 should be bypassed using the RC bypasses shown in Figure 2.
Eliminating the resistors on the VCC2 and VeC3 bypasses may be possible in some applications, but a reduction in sensitivity and quieting will likely occur.
The low battery detection circuit gives an NPN open collector output at Pin 20 which drops low when the MC3367 supply voltage drops below 1.1 V. Typically it would be pulled up via a 100 kG resistor to supply.
The 1.2 V Select pin, when connected to the MC3367 supply, programs the low battery detector to trip at VCC
< 1.1 V. Leaving this pin open raises the trip voltage on the low battery detector.
Pin 16 is a receiver enable, which is connected to Vee for normal operation. Connecting this pin to ground shuts off receiver and reduces current drain to Ice <
0.5/LA.
MC3367