MOTOROLA MC3374

Order this document by MC3374/D
. . . with single conversion circuitry including oscillator, mixer, IF amplifiers,
limiting IF circuitry, and quadrature discriminator. The MC3374 is perfect for
narrowband audio and data applications up to 75 MHz which require
extremely low power consumption. Battery powered applications down to
VCC = 1.1 V are possible. The MC3374 also includes an on–board voltage
regulator, low battery detection circuitry, a receiver enable allowing a power
down Sleep–Mode, two undedicated buffer amplifiers to allow
simultaneous audio and data reception, and a comparator for enhancing
FSK (Frequency Shift Keyed) data reception to 1200 baud.
• Low Supply Voltage: VCC = 1.1 to 3.0 Vdc
•
•
•
•
•
•
•
•
•
•
LOW VOLTAGE
SINGLE CONVERSION
FM RECEIVER
SEMICONDUCTOR
TECHNICAL DATA
Low Power Consumption: PD = 1.5 to 5.0 mW
Input Bandwidth 75 MHz
32
Excellent Sensitivity: 0.5 µVrms for 12 dB SINAD
1
Voltage Regulator Available (Source Capability 3.0 mA)
Receiver Enable to Allow Active/Standby Operation
Low Battery Detection Circuitry
FTB SUFFIX
PLASTIC PACKAGE
CASE 873
(Thin QFP)
Self Biasing Audio Buffer
Data Buffer
FSK Data Shaping Comparator
Standard 32–Lead QFP Surface Mount Package
ORDERING INFORMATION
Sleep–Mode is a trademark of Motorola, Inc.
Device
Tested Operating
Temperature Range
MC3374FTB TA = – 10° to +70°C
Package
TQFP–32
Simplified Block Diagram
Data Data
Osc Mixer Mixer Mixer 2nd IF Buffer Buffer 1st IF
Dcpl
In
Out Dcpl
In
Out
In
Out
32
Osc Base
31
1
30
29
28
Data
Buffer
Mixer
2nd IF
Osc Emit
Isrc Dcpl
26
25
24 VCC3
1st IF
2
23 1st IF In
Audio
Buffer
3
IF Gnd
4
VCC2
5
Rec Audio
6
Voltage
Reference
8
9
*Internal Connection, do not ground.
Main
Current
Reference
Quadrature
Demodulator
10
11
Quad Demod *N/C
Tank Gnd
12
13
20 Low Battery Detector
19 1.2 V Select
18 VCC
Receiver
Enable
Comp.
22 Audio Buffer Out
21 Audio Buffer In
Low
Battery
Detector
Low
Pass
Filter
Output
Demodulator Decoupling 7 Buffer
Quad Tank
27
14
Voltage
Reference
15
17 Vreg
16
*N/C Comp Comp Rec Regulator
I/P
O/P Enable Reference
Test
This device contains 87 active transistors
 Motorola, Inc. 1996
MOTOROLA ANALOG IC DEVICE DATA
Rev 0
1
MC3374
MAXIMUM RATINGS (Voltage with respect to Pins 4 and 10; TA = 25°C.)
Pin
Value
Unit
Supply Voltage
Rating
18
5.0
Vdc
RF Input Signal
31
1.0
Vrms
Audio Buffer Input
21
1.0
Vrms
Data Buffer Input
26
1.0
Vrms
Comparator Input
13
1.0
Vrms
Junction Temperature
–
150
°C
Storage Temperature
–
– 65 to +150
°C
Device should not be operated at or outside these values. The “Recommended Operating Limits” provide
for actual device operation.
RECOMMENDED OPERATING CONDITIONS
Pin
Value
Unit
Supply Voltage
Parameter
18
1.1 to 3.0
Vdc
Receiver Enable Voltage
15
VCC
Vdc
1.2 V Select Voltage
19
Open or VCC
Vdc
RF Input Signal Level
31
0.001 to 100
mVrms
RF Input Frequency
31
0 to 75
MHz
Intermediate Frequency (IF)
–
455
kHz
Audio Buffer Input
21
0 to 75
mVrms
Data Buffer Input
26
0 to 75
mVrms
Comparator Input
13
10 to 300
mVrms
Ambient Temperature
–
–10 to 70
°C
ELECTRICAL CHARACTERISTICS (VCC = 1.3 V, fo = 10.7 MHz, fmod = 1.0 kHz, Deviation = 3.0 kHz, TA = 25°C, Test
Circuit of Figure 1, unless otherwise noted.)
Characteristic
Pin
Min
Typ
Max
Unit
5 + 18 + 24
5 + 18 + 24
–
–
1.6
0.5
3.0
–
mA
µA
6
13
18
30
mVrms
Noise Output (RF Input = 0 mV, 300 Hz – 5.0 kHz)
6
–
1.0
–
mVrms
Input for – 3.0 dB Limiting
31
–
0.6
–
µVrms
Mixer Input Resistance (Rp)
31
–
1.5
–
kΩ
Mixer Input Capacitance (Cp)
31
–
9.0
–
pF
–
–
27
–
dB
Voltage Gain
–
3.0
4.0
4.7
V/V
Input Resistance
21
–
110
–
kΩ
Maximum Input for Undistorted Output (<5% THD)
21
–
64
–
mVrms
Maximum Output Swing (<5% THD)
22
–
690
–
mVpp
Output Resistance
22
–
780
–
Ω
Voltage Gain
–
1.4
2.7
4.3
V/V
Input Resistance
26
–
9.8
–
MΩ
Maximum Input for Undistorted Output (<5% THD)
26
–
100
–
mVrms
Maximum Output Swing (<5% THD)
27
–
800
–
mVpp
Output Resistance
27
–
690
–
Ω
OVERALL MC3374 PERFORMANCE
Drain Current – Pin 15 = VCC (Enabled)
Drain Current – Pin 15 = 0 Vdc (Disabled)
Recovered Audio (RF Input = 10 µV)
ā
MIXER
FIRST IF AMPLIFIER
First IF Amp Voltage Gain
AUDIO BUFFER
DATA BUFFER
2
MOTOROLA ANALOG IC DEVICE DATA
MC3374
ELECTRICAL CHARACTERISTICS (continued) (VCC = 1.3 V, fo = 10.7 MHz, fmod = 1.0 kHz, Deviation = 3.0 kHz, TA
= 25°C, Test Circuit of Figure 1, unless otherwise noted.)
Characteristic
Pin
Min
Typ
Max
Unit
Minimum Input for Triggering (RL = 100 kΩ)
13
–
7.0
–
mVrms
Maximum Input Frequency (RL = 100 kΩ)
13
–
25
–
kHz
Rise Time (10 – 90%; RL = 100 kΩ)
14
–
5.0
–
µs
Fall Time (90 – 10%; RL = 100 kΩ)
14
–
0.4
–
µs
Low Battery Trip Point
19
–
1.2
–
Vdc
Low Battery Output – VCC = 0.9 V
Low Battery Output – VCC = 1.3 V
20
20
–
–
0.2
VCC
–
–
Vdc
Regulated Output (see Figure 4)
17
0.95
1.07
1.15
Vdc
Source Capability
17
–
–
3.0
mA
COMPARATOR
LOW BATTERY DETECTOR
VOLTAGE REGULATOR
Figure 1. MC3374 Pager IF Application Circuit
RF Input
50
FL2
FL1
L1
0.01
CC1
C1
C2
CC2
180 k
0.1
CB
CB
32
31
30
29
28
27
26
25
–
L2
CC3
RD
X
1
Mixer
C3
2nd IF
2
C4
39 k
1st IF
23
Audio
Buffer
1.0 µF
22
Voltage
Reference
4
330
24
MC3374
3
CB
Data
Buffer
21
3900 P
0.1
5
Output
Buffer
6
10
7
8
Low
Battery
Detector
Low
Pass
Filter
Main
Current
Reference
Quadrature
Demodulator
19
10
17
0.022
3.3 k
1.0
9
10
11
12
13
14
15
16
Disable
N.C. N.C.
LC1
8.2 k
0.1
0.1
56 k
8.2 k
20
18
Receiver Voltage
Enable Reference
Comp.
100
100 k
MOTOROLA ANALOG IC DEVICE DATA
0.22
RL
Enable
4.7+
Data Output
NOTES:
1. FL1 and FL2 are 455 kHz ceramic bandpass filters, which should
have input and output impedances of 1.5 kΩ to 2.0 kΩ. Suggested
part numbers are MuRata CFU455X or CFW455x – the ‘X’ suffix
denotes bandwidth.
2. LC1 is a 455 kHz LC resonator. Recommended part numbers are
Toko America RMC2A6597HM or 5SVLC–0637BGT (smaller).
The evaluation board layout shown provides for use of either
resonator. Ceramic discriminator elements cannot be used with
the MC3374 due to their low input impedance. The damping
resistor value can be raised to increase the recovered audio or
lowered to increase the quadrature detector’s bandwidth and
linearity – practical limits are approximately 27 kΩ to 75 kΩ.
Typically the quadrature detector’s bandwidth should match the
low IF filter’s bandwidth.
3. The data buffer is set up as a low–pass filter with a corner
frequency of approximately 200 Hz. The audio buffer is a
bandpass filter with corner frequencies of 300 Hz and 3.0 kHz.
The audio amplifier provides bass suppression.
Audio
Output
VCC
VEE
4. CC1 and CC3 are RF coupling capacitors and should have ≤ 20 Ω
impedance at the desired input and oscillator frequencies.
5. CC2 provides “light coupling” of the oscillator signal into the mixer,
and should have a 3.0 kΩ to 5.0 kΩ impedance at the desired
local oscillator frequency.
6. Capacitors labelled CB are bypass capacitors and should have
20 Ω impedance at the desired RF and local oscillator frequencies.
7. The network of L1, C1 and C2 provides impedance matching of
the mixer input (nominally 3.0 kΩ shunted by 9.0 pF) to 50 Ω at the
desired RF/IF input frequency. This will allow for bench testing of
the receiver from typical RF signal generators or radio service
monitors, but additional or different matching will be required to
maximize receiver sensitivity when used in conjunction with an
antenna, RF preamplifier or mixer.
3
MC3374
In. Freq.
L1
L2
C1
C2
C3
C4
CC1/CC3
CC2
CB
RD
10.7 MHz
6.8 µH
Short
2 – 82 pF
10 pF
120 pF
50 pF
1.0 nF
5.0 pF
0.1 µF
Open
45 MHz
0.68 µH
1.2 µH
5 – 25 pF
Open
30 pF
5.0 pF
1.0 nF
1.0 pF
1.0 nF
1.0 k
72 MHz
0.22 µH
0.22 µH
5 – 25 pF
Open
18 pF
3.0 pF
470 pF
1.0 pF
470 pF
1.0 k
Figure 2. Recovered Audio versus Supply
Figure 3. S+N, N versus Input
30
60
20
10
N, S+N (dB)
40
30
0
S+N
– 10
– 20
– 30
20
V6
– 40
10
N
– 50
– 60
– 120 – 110 – 100 – 90
0
0
1.0
2.0
3.0
4.0
– 80
VCC (V)
V17, REGULATED OUTPUT (mVdc)
800
RL = ∞
400
RL = 990
200
RL = 330
0
0
1.0
2.0
3.0
– 50
4.0
5.0
1140
– 40
– 30
18.0
1120
17.5
V6
1100
17.0
1080
16.5
1060
16.0
V17
1040
15.5
1020
15.0
1000
– 50
– 25
0
25
50
75
100
14.5
125
TA, AMBIENT TEMPERATURE (°C)
VCC (V)
Figure 6. Buffer Amplifier Gains
versus Temperature
2.98
3.99
Avdb
2.93
3.97
Avab
3.95
2.88
3.93
2.83
3.91
– 50
– 25
0
25
50
75
100
A vdb , DATA BUFFER GAIN (V/V)
3.03
4.01
A vab , AUDIO BUFFER GAIN (V/V)
V17, VOLTAGE REGULATION (mV)
1000
600
– 60
Figure 5. Regulated Output and Recovered
Audio versus Temperature
Figure 4. VREG versus Supply
1200
– 70
INPUT (dBm)
V6, RECOVERED AUDIO (mVrms)
RECOVERED AUDIO (mVrms)
V22
50
2.78
125
TA, AMBIENT TEMPERATURE (°C)
4
MOTOROLA ANALOG IC DEVICE DATA
MC3374
Figure 7. MC3374 Pager Receiver PCB Artwork
COPPER 1 LAYER
(Actual View of Surface Mount Side)
RF Input
COPPER 2 LAYER
(Caution: Reversed View of Through–Hole Side)
VEE
MC3374FTB
VCC
2.2″
Enable
Data
Output
Disable
2.0″
COMPONENT 1 LAYER
C2
FL1
1.0
3900 P
X
0.1
L2
0.01
0.01
0.33 k 0.01
10
39 k
180 k
0.022
8.2 k
LC1
0.1 CB
56 K
VCC
GND
C3
C4
4.7
CB
CB
RD
CC3
FL2
CC1
CC2
C1
RF I/P
GND
VCC
L1
COMPONENT 2 LAYER
1.0
0.1
10
3.3 k
LED
100 K
8.2 k
0.22
Data O/P
RL
Enable
Disable
SMA
NOTE: + = Through Hole
MOTOROLA ANALOG IC DEVICE DATA
5
MC3374
CIRCUIT DESCRIPTION
The MC3374 is an FM narrowband receiver capable of
operation to 75 MHz. The low voltage design yields low
power drain and excellent sensitivity in narrowband voice
and data link applications. In the typical application the mixer
amplifies the incoming RF or IF signal and converts this
frequency to 455 kHz. The signal is then filtered by a 455 kHz
ceramic filter and applied to the first intermediate frequency
(IF) amplifier input, before passing through a second ceramic
filter. The modulated IF signal is then applied to the limiting IF
amplifier and detector circuitry. Modulation is recovered by a
conventional quadrature detector. The typical modulation
bandwidth available is 3.0 to 5.0 kHz.
Features available include buffers for audio/data
amplification and active filtering, on board voltage regulator,
low battery detection circuitry with programmable level, and
receiver disable circuitry. The MC3374 is an FM utility
receiver to be used for voice and/or narrowband data
reception. It is especially suitable where extremely low power
consumption and high design flexibility are required.
APPLICATION
The MC3374 can be used as a high performance FM IF for
the use in low power dual conversion receivers. Because of
the MC3374’s extremely good sensitivity (0.6 µV for 20 dB
(S+N/N, see Figure 3)), it can also be used as a stand alone
single conversion narrowband receiver to 75 MHz for
applications not sensitive to image frequency interference.
An RF preamplifier will likely be needed to overcome
preselector losses.
The oscillator is a Colpitts type which must be run under
crystal control. For fundamental mode crystals choose
resonators, parallel resonant, for a 32 pF load. For higher
frequencies, use a 3rd overtone series mode type. The coil
L2 and RD resistor are needed to ensure proper operation.
The best adjacent channel and sensitivity response occur
when two 455 kHz ceramic filters are used, as shown in
Figure 1. Either can be replaced by a 0.1 µF coupling
capacitor to reduce cost, but some degradation in sensitivity
and/or stability is suspected.
The detector is a quadrature type, with the connection
from the limiter output to the detector input provided
internally. A 455 kHz LC tank circuit must be provided
externally. One of the tank pins (Pin 8) must be decoupled
using a 0.1 µF capacitor. The 56 kΩ damping resistor (see
Figure 1), determines the peak separation of the detector
(and thus its bandwidth). Smaller values will increase the
separation and bandwidth but decrease recovered audio and
sensitivity.
The data buffer is a noninverting amplifier with a nominal
voltage gain of 2.7 V/V. This buffer needs its dc bias
(approximately 250 mV) provided externally or else
debiasing will occur. A 2nd order Sallen–Key low pass filter,
as shown in Figure 1, 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.
6
The audio buffer is a noninverting amplifier with a nominal
voltage gain of 4.0 V/V. This buffer is self–biasing so its input
should be ac coupled. The two buffers, when applied 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 noninverting type with an open
collector output. Typically, the pull–up resistor used between
Pin 14 and VCC is 100 kΩ. With RL = 100 kΩ the comparator
is capable of operation up to 25 kHz. The circuit is
self–biasing, so its input should be ac coupled.
The regulator is a 1.07 V reference capable of sourcing
3.0 mA. This pin (Pin 17) needs to be decoupled using a
1.0 – 10 µF capacitor to maintain stability of the MC3374.
All three VCCs on the MC3374 (VCC, VCC2, VCC3) run on
the same supply voltage. VCC is typically decoupled using
capacitors only. VCC2 and VCC3 should be bypassed using
the RC bypasses shown in Figure 1. Eliminating the resistors
on the VCC2 and VCC3 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 MC3374
supply voltage drops below 1.2 V. Typically it would be pulled
up via a 100 kΩ resistor to supply.
The 1.2 V Select pin, when connected to the MC3374 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 15 is a receiver enable which is connected to VCC for
normal operation. Connecting this pin to ground shuts off
receiver and reduces current drain to ICC < 0.5 µA.
APPENDIX
Design of 2nd Order Sallen–Key Low Pass Filters
C1
R1
Input
R2
Low Pass Output
0 to fo Hz
+
–
C2
Bias
Avo = K
The audio and data buffers can easily be configured as active
low pass filters using the circuit configuration shown above.
The circuit has a center frequency (fo) and quality factor (Q)
given by the following:
fo
Q
+
1
+ 2p ǸR1R2C1C2
Ǹ )Ǹ
R2C2
R1C1
1
R1C2
R2C1
) (1–K)
Ǹ
R1C1
R2C2
If possible, let R1 = R2 or C1 = C2 to simplify the above
equations. Be sure to avoid a negative Q value to prevent
instability. Setting Q
filter response.
+ 1 ńǸ2 + 0.707 yields a maximally flat
MOTOROLA ANALOG IC DEVICE DATA
MC3374
Data Buffer Design
Audio Buffer Design
The data buffer is designed as follows:
The audio buffer is designed as follows:
fo = 200 Hz
C1 = C2 = 0.01 µF
Q = 0.707 (target)
fo = 3000 Hz
R1 = R2 = 8.2 kΩ
Q = 0.707 (target)
K = 2.7 (data buffer open loop voltage gain)
K = 3.9 (audio buffer open loop voltage gain)
Setting C1 = C2 yields:
Setting C1 = C2 yields:
fo
Q
+
+ 2pC1 1ǸR1R2
Ǹ
R2
R1
1
) (2–K)
Ǹ
R1
R2
Iteration yields R2 = 4.2 (R1) to make Q = 0.707.
Substitution into the equation for fo yields:
R1 = 38 kΩ (use 39 kΩ)
R2 = 4.2(R1) = 180 kΩ
C1 = C2 = 0.01 µF
fo
Q
+
+ 2pR1 1ǸC1C2
Ǹ
C2
C1
1
) (1–K)
Ǹ
C1
C2
Iteration yields C2 = 2.65 (C1) to make Q = 0.707.
Substitution into the equation for fo yields:
C1 = 3900 pF
C2 = 2.65(C1) = 0.01 µF
R1 = R2 = 8.2 kΩ
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding
the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters which may be provided in Motorola
data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals”
must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of
others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other
applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury
or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola
and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees
arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that
Motorola was negligent regarding the design or manufacture of the part. Motorola and
are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal
Opportunity/Affirmative Action Employer.
MOTOROLA ANALOG IC DEVICE DATA
7
MC3374
OUTLINE DIMENSIONS
FTB SUFFIX
PLASTIC PACKAGE
CASE 873–01
(Thin QFP)
ISSUE A
L
24
17
B
DETAIL A
32
D
S
H A–B
V
M
L
B
0.20 (0.008)
-B-
-A-
0.20 (0.008) M C A–B
0.05 (0.002) A–B
S
D
S
16
S
25
P
B
9
1
8
-A-,-B-,-DDETAIL A
-DA
0.20 (0.008) M C A–B
0.05 (0.002) A–B
S
D
S
S
D
S
F
BASE METAL
S
0.20 (0.008)
M
H A–B
J
DETAIL C
M
N
D
C E
-H-
-CSEATING
PLANE
H
M
G
U
T
R
-HDATUM
PLANE
K
Q
X
DETAIL C
DATUM
PLANE
0.20 (0.008)
0.01 (0.004)
M
C A–B
S
D
S
SECTION B-B
VIEW ROTATED 90° CLOCKWISE
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DATUM PLANE -H- IS LOCATED AT BOTTOM OF
LEAD AND IS COINCIDENT WITH THE LEAD WHERE
THE LEAD EXITS THE PLASTIC BODY AT THE
BOTTOM OF THE PARTING LINE.
4. DATUMS -A-, -B- AND -D- TO BE DETERMINED AT
DATUM PLANE -H-.
5. DIMENSIONS S AND V TO BE DETERMINED AT
SEATING PLANE -C-.
6. DIMENSIONS A AND B DO NOT INCLUDE MOLD
PROTRUSION. ALLOWABLE PROTRUSION IS 0.25
(0.010) PER SIDE. DIMENSIONS A AND B DO
INCLUDE MOLD MISMATCH AND ARE DETERMINED
AT DATUM PLANE -H-.
7. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR PROTRUSION
SHALL BE 0.08 (0.003) TOTAL IN EXCESS OF THE D
DIMENSION AT MAXIMUM MATERIAL CONDITION.
DAMBAR CANNOT BE LOCATED ON THE LOWER
RADIUS OR THE FOOT.
DIM
A
B
C
D
E
F
G
H
J
K
L
M
N
P
Q
R
S
T
U
V
X
MILLIMETERS
MIN
MAX
7.10
6.95
7.10
6.95
1.60
1.40
0.273 0.373
1.50
1.30
—
0.273
0.80 BSC
0.20
—
0.119 0.197
0.57
0.33
5.6 REF
8°
6°
0.119 0.135
0.40 BSC
5°
10°
0.15
0.25
8.85
9.15
0.15
0.25
5°
11°
8.85
9.15
1.0 REF
INCHES
MIN
MAX
0.274 0.280
0.274 0.280
0.055 0.063
0.010 0.015
0.051 0.059
—
0.010
0.031 BSC
0.008
—
0.005 0.008
0.013 0.022
0.220 REF
8°
6°
0.005 0.005
0.016 BSC
5°
10°
0.006 0.010
0.348 0.360
0.006 0.010
5°
11°
0.348 0.360
0.039 REF
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MFAX: [email protected] – TOUCHTONE 602–244–6609
INTERNET: http://Design–NET.com
ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park,
51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852–26629298
8
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*MC3374/D*
MOTOROLA ANALOG IC DEVICE
DATA
MC3374/D