MC2833.PDF

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MC2833 is a one–chip FM transmitter subsystem designed for cordless
telephone and FM communication equipment. It includes a microphone
amplifier, voltage controlled oscillator and two auxiliary transistors.
•
Wide Range of Operating Supply Voltage (2.8–9.0 V)
LOW POWER
FM TRANSMITTER
SYSTEM
•
Low Drain Current (I CC = 2.9 mA Typ)
SEMICONDUCTOR
TECHNICAL DATA
•
Low Number of External Parts Required
•
– 30 dBm Power Output to 60 MHz Using Direct RF Output
•
+ 10 dBm Power Output Attainable Using On–Chip Transistor Amplifiers
•
Users Must Comply with Local Regulations on R.F.
Transmission (FCC, DOT, P.T.T., etc)
P SUFFIX
PLASTIC PACKAGE
CASE 648
D SUFFIX
PLASTIC PACKAGE
CASE 751B
(SO–16)
Representative Block Diagram
PIN CONNECTIONS
1
16
RF
Osc
Variable
Reactance
Output
1
16
RF
Osc
2
Variable
Reactance
15
Decoupling
Modulator
Input
Mic Amp
Output
2
15
3
Buffer
14
3
14
RF
Output
Mic
Amp
4
13
Tr 2
Base
4
13
Mic Amp
Input
Tr 2
Emitter
5
12
–
+
Gnd
6
11
Tr 2
Collector
12
5
Tr 1
Emitter
7
10
V CC
6
11
Tr 1
Base
8
9
Tr 1
Collector
7
V REF
10
ORDERING INFORMATION
8
9
Operating
Temperature Range
Device
Package
MC2833D
MC2833P
T A = – 30 to +75
C
SO–16
Plastic DIP
W
Motorola, Inc. 1995
MOTOROLA ANALOG IC DEVICE DATA
1
°
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MC2833
MAXIMUM RATINGS
Ratings
Symbol
Value
Unit
Power Supply Voltage
V CC
10 (max)
V
Operating Supply Voltage Range
V CC
2.8–9.0
V
Junction Temperature
T J
+ 150
°
C
Operating Ambient Temperature
T A
– 30 to + 75
° C
Storage Temperature Range
T stg
– 65 to + 150
° C
ELECTRICAL CHARACTERISTICS (V CC = 4.0 V, T A = 25 ° C, unless otherwise noted)
Characteristics
Symbol
Pin
Min
Typ
Max
Unit
Drain Current (No input signal)
I CC
10
1.7
2.9
4.3
mA
FM MODULATOR
Output RF Voltage (f o = 16.6 MHz)
V out RF
14
60
90
130
mVrms
Output DC Voltage (No input signal)
Vdc
14
2.2
2.5
2.8
V
Modulation Sensitivity (f o = 16.6 MHz)
Modulation Sensitivity (V in = 0.8 V to 1.2 V)
SEN
3
14
7.0
–
10
–
15
–
Hz/mVdc
Maximum Deviation (f o = 16.6 MHz)
Maximum Deviation (V in = 0 V to 2.0 V)
Fdev
3
14
3.0
–
5.0
–
10
–
kHz
MIC AMPLIFIER
Closed Loop Voltage Gain (V in = 3.0 mVrms)
Closed Loop Voltage Gain (f in = 1.0 kHz)
A v
4
5
27
–
30
–
33
–
dB
Output DC Voltage (No input signal)
V out dc
4
1.1
1.4
1.7
V
Output Swing Voltage (V in = 30 mVrms)
Output Swing Voltage (f in = 1.0 kHz)
V out p–p
4
0.8
1.2
1.6
Vp–p
Total Harmonic Distortion (V in = 3.0 mVrms)
Total Harmonic Distortion (f in = 1.0 kHz)
THD
4
–
0.15
2.0
%
AUXILIARY TRANSISTOR STATIC CHARACTERISTICS
Characteristics
Symbol
Min
Typ
Max
Unit
Collector Base Breakdown Voltage (I C = 5.0 m A)
V (BR)CBO
15
45
–
V
Collector Emitter Breakdown Voltage (I C = 200 m A)
V (BR)CEO
10
15
–
V
Collector Substrate Breakdown Voltage (I C = 50
m
A)
V (BR)CSO
–
70
–
V
Emitter Base Breakdown Voltage (I E = 50 m A)
V (BR)EBO
–
6.2
–
V
Collector Base Cut Off Current (V CB = 10 V)
Collector Base Cut Off Current (I E = 0)
I CBO
–
–
200
nA
DC Current Gain (I C = 3.0 mA)
DC Current Gain (V CE = 3.0 V)
h FE
40
150
–
–
AUXILIARY TRANSISTOR DYNAMIC CHARACTERISTICS
Current Gain Bandwidth Product (V CE = 3.0 V)
Current Gain Bandwidth Product (I C = 3.0 mA)
f T
–
500
–
MHz
Collector Base Capacitance (V CE = 3.0 V)
Collector Base Capacitance (I C = 0)
C CB
–
2.0
–
pF
Collector Substrate Capacitance (V CS = 3.0 V)
Collector Substrate Capacitance (I C = 0)
C CS
–
3.3
–
pF
2
MOTOROLA ANALOG IC DEVICE DATA
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MC2833
Figure 1. Test Circuit
5.1
m
H
16.605 MHz
Crystal:
f C L
C o
R S
= 16.605 MHz
= 30 pF
= 6.1 pF
= 10
Mod Out
1
16
0.0047 m F
39 pF
W
Max
2
15
68 pF
Mod In
3
14
RF Out
Mic Amp
Out
4
13
Base 2
220 k
MC2833
Mic Amp
In
5
12
Emitter 2
6.3 k
6
11
Collector 2
Emitter 1
7
10
+
47
m F
0.01
m
F
Base 1
8
9
Collector 1
Figure 2. Single Chip VHF Narrowband FM Transmitter
Lt
X1
1
16
RF
Osc.
56 p
Variable
Reactance
2
15
4700 p
51 p
100 k
C c 1
3
Buffer
14
4700 p
47 p
0.22
m
C1
Mic Amp
Deviation
Adjust
100 k
4
13
390 k
120 k
–
+
1.0 k
Audio
Input
5
Q2
12
Dynamic
Mike
2.7 k
1.0 m
L1
C2
6
11
1000 p
4.7 k
Re1
C3
1.0 k
7
V REF
10
470 p
Q1
470 p
RF Output
5.0 to 10 dBm
(see Note 4)
8
9
Electret
(alternate)
Microphone
and biasing
C4
L2
C5
Rb1
Cc2
+
F
tantalum
m
V CC = 9.0 Vdc
NOTES:
1. Components versus output frequency:
Output RF
X1 (MHz)
Lt ( m H)
L1 ( m H)
L2 ( m H)
Re1
Rb1
Cc1
Cc2
C1
C2
C3
C4
C5
220 p
120 p
33 p
2. Crystal X1 is fundamental mode, calibrated for parallel resonance with a 32 pF load. The final output frequency is generated by frequency multiplication within
2. the MC2833 IC. The RF output buffer (Pin 14) and Q2 transistor are used as a frequency tripler and doubler, respectively, in the 76 and 144 MHz transmitters.
2. The Q1 output transistor is a linear amplifier in the 49.7 MHz and 76 MHz transmitters, and a frequency doubler in the 144 MHz transmitter.
3. All coils used are 7 mm shielded inductors, CoilCraft series M1175A, M1282A–M1289A, M1312A or equivalent.
4. Power output is 9 + 10 dBm for 50 MHz and 76 MHz transmitters, and 9 + 5.0 dBm for the 144 MHz transmitter at V CC = 8.0 V. Power output drops with lower
4. V CC .
5. All capacitors in microfarads, inductors in Henries and resistors in Ohms unless otherwise specified.
6. Other frequency combinations may be set–up by simple scaling of the 3 examples shown.
16.6667
12.6000
12
3.3–4.7
5.1
5.6
0.22
0.22
0.15
0.22
0.22
0.10
330
150
150
390 k
300 k
220 k
33 p
68 p
47 p
33 p
10 p
10 p
33 p
68 p
68 p
470 p
470 p
1000 p
33 p
12 p
18 p
47 p
20 p
12 p
MOTOROLA ANALOG IC DEVICE DATA
3
1.0
50 MHz
76 MHz
144 MHz
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MC2833
Figure 3. Buffer/Multiplier (x3, Pin 14)
(16 MHz Fundamental)
Figure 4. Input to Doubler (Pin 13)
(50 MHz x 3 Component)
Figure 5. Doubler Output 76 MHz (Pin 11)
Figure 6. Spectrum
38 MHz
76 MHz
Figure 7. Output Spectrum (50 MHz)
Figure 8. Modulation Spectrum
(1.0 kHz Showing Carrier Null)
– 43 dB
4
MOTOROLA ANALOG IC DEVICE DATA
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MC2833
Figure 9. 144 MHz/x12 Multiplier
Figure 10. Circuit Side View
OUT
GND
IN
MC2833P
VCC
Figure 11. Ground Plane on Component Side
MC2833P
MOTOROLA ANALOG IC DEVICE DATA
5
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