Device
Operating
Temperature Range
Package
MC2833
SEMICONDUCTOR
TECHNICAL DATA
LOW POWER
FM TRANSMITTER
SYSTEM
ORDERING INFORMATION
MC2833D
MC2833P
TA = 30 to +75
C
SO16
Plastic DIP
PIN CONNECTIONS
Order this document by MC2833/D
D SUFFIX
PLASTIC PACKAGE
CASE 751B
(SO16)
P SUFFIX
PLASTIC PACKAGE
CASE 648
Tr 1
Base
Tr 1
Emitter
Gnd
Mic Amp
Input
9
10
11
12
13
14
15
16
8
7
6
5
4
3
2
1
Variable
Reactance
Output
Decoupling
Modulator
Input
Mic Amp
Output
Tr 1
Collector
VCC
Tr 2
Collector
Tr 2
Emitter
Tr 2
Base
RF
Output
RF
Osc
1
MOTOROLA ANALOG IC DEVICE DATA
Low Power FM
Transmitter System
MC2833 is a onechip 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 (2.89.0 V)
Low Drain Current (ICC = 2.9 mA Typ)
Low Number of External Parts Required
30 dBm Power Output to 60 MHz Using Direct RF Output
+ 10 dBm Power Output Attainable Using OnChip Transistor Amplifiers
Users Must Comply with Local Regulations on R.F.
Transmission (FCC, DOT, P.T.T., etc)
Representative Block Diagram
+
2
16
15
14
13
12
11
10
9
8
7
6
5
4
3
1
Variable
Reactance
RF
Osc
Buffer
Mic
Amp
VREF
Motorola, Inc. 1996
Rev 1
MC2833
2
MOTOROLA ANALOG IC DEVICE DATA
MAXIMUM RATINGS
Ratings
Symbol
Value
Unit
Power Supply Voltage
VCC
10 (max)
V
Operating Supply Voltage Range
VCC
2.89.0
V
Junction Temperature
TJ
+ 150
C
Operating Ambient Temperature
TA
30 to + 75
C
Storage Temperature Range
Tstg
65 to + 150
C
ELECTRICAL CHARACTERISTICS
(VCC = 4.0 V, TA = 25
C, unless otherwise noted)
Characteristics
Symbol
Pin
Min
Typ
Max
Unit
Drain Current (No input signal)
ICC
10
1.7
2.9
4.3
mA
FM MODULATOR
Output RF Voltage (fo = 16.6 MHz)
Vout RF
14
60
90
130
mVrms
Output DC Voltage (No input signal)
Vdc
14
2.2
2.5
2.8
V
Modulation Sensitivity (fo = 16.6 MHz)
Modulation Sensitivity
(Vin = 0.8 V to 1.2 V)
SEN
3
14
7.0
10
15
Hz/mVdc
Maximum Deviation (fo = 16.6 MHz)
Maximum Deviation
(Vin = 0 V to 2.0 V)
Fdev
3
14
3.0
5.0
10
kHz
MIC AMPLIFIER
Closed Loop Voltage Gain (Vin = 3.0 mVrms)
Closed Loop Voltage Gain
(fin = 1.0 kHz)
Av
4
5
27
30
33
dB
Output DC Voltage (No input signal)
Vout dc
4
1.1
1.4
1.7
V
Output Swing Voltage (Vin = 30 mVrms)
Output Swing Voltage
(fin = 1.0 kHz)
Vout pp
4
0.8
1.2
1.6
Vpp
Total Harmonic Distortion (Vin = 3.0 mVrms)
Total Harmonic Distortion
(fin = 1.0 kHz)
THD
4
0.15
2.0
%
AUXILIARY TRANSISTOR STATIC CHARACTERISTICS
Characteristics
Symbol
Min
Typ
Max
Unit
Collector Base Breakdown Voltage (IC = 5.0
A)
V(BR)CBO
15
45
V
Collector Emitter Breakdown Voltage (IC = 200
A)
V(BR)CEO
10
15
V
Collector Substrate Breakdown Voltage (IC = 50
A)
V(BR)CSO
70
V
Emitter Base Breakdown Voltage (IE = 50
A)
V(BR)EBO
6.2
V
Collector Base Cut Off Current (VCB = 10 V)
Collector Base Cut Off Current
(IE = 0)
ICBO
200
nA
DC Current Gain (IC = 3.0 mA)
DC Current Gain
(VCE = 3.0 V)
hFE
40
150
AUXILIARY TRANSISTOR DYNAMIC CHARACTERISTICS
Current Gain Bandwidth Product (VCE = 3.0 V)
Current Gain Bandwidth Product
(IC = 3.0 mA)
fT
500
MHz
Collector Base Capacitance (VCE = 3.0 V)
Collector Base Capacitance
(IC = 0)
CCB
2.0
pF
Collector Substrate Capacitance (VCS = 3.0 V)
Collector Substrate Capacitance
(IC = 0)
CCS
3.3
pF
MC2833
3
MOTOROLA ANALOG IC DEVICE DATA
Figure 1. Test Circuit
Figure 2. Single Chip VHF Narrowband FM Transmitter
Electret
(alternate)
Microphone
and biasing
470 p
1.0
F
tantalum
+
1000 p
C5
RF Output
5.0 to 10 dBm
(see Note 4)
C4
C3
L1
L2
C2
1.0 k
390 k
0.22
C1
Cc1
47 p
Q2
Cc2
VCC = 9.0 Vdc
Rb1
470 p
Q1
Re1
2.7 k
4.7 k
Dynamic
Mike
Audio
Input
100 k
Deviation
Adjust
120 k
X1
Lt
1.0 k
56 p
51 p
VREF
Buffer
RF
Osc.
Variable
Reactance
Mic Amp
9
16
15
14
13
12
1
2
3
4
5
6
7
8
10
11
+
1.0
100 k
4700 p
4700 p
Crystal:
39 pF
68 pF
+
47
F
0.01
F
Collector 1
Collector 2
Base 2
Emitter 2
Base 1
Emitter 1
Mic Amp
Out
RF Out
0.0047
F
Mod Out
16.605 MHz
5.1
H
Mod In
Mic Amp
In
220 k
6.3 k
MC2833
6
7
1
2
3
4
5
8
9
10
11
12
13
14
15
16
fo
CL
Co
RS
= 16.605 MHz
= 30 pF
= 6.1 pF
= 10
Max
NOTES:
1. Components versus output frequency:
Output RF
X1 (MHz)
Lt (
H)
L1 (
H)
L2 (
H)
Re1
Rb1
Cc1
Cc2
C1
C2
C3
C4
C5
49.7 MHz
76 MHz
144.6 MHz
16.5667
12.6000
12.05
3.34.7
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
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 144.6 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 144.6 MHz transmitter.
3. All coils used are 7 mm shielded inductors, CoilCraft series M1175A, M1282AM1289A, M1312A or equivalent.
4. Power output is
+ 10 dBm for 49.7 MHz and 76 MHz transmitters, and
+ 5.0 dBm for the 144.6 MHz transmitter at VCC = 8.0 V. Power output drops with
4.
lower VCC.
5. All capacitors in microfarads, inductors in Henries and resistors in Ohms unless otherwise specified.
6. Other frequency combinations may be setup by simple scaling of the 3 examples shown.
MC2833
4
MOTOROLA ANALOG IC DEVICE DATA
Figure 3. Buffer/Multiplier (x3, Pin 14)
(16 MHz Fundamental)
38 MHz
76 MHz
43 dB
Figure 4. Input to Doubler (Pin 13)
(49.7 MHz x 3 Component)
Figure 5. Doubler Output 76 MHz (Pin 11)
Figure 6. Spectrum
Figure 7. Output Spectrum (49.7 MHz)
Figure 8. Modulation Spectrum
(1.0 kHz Showing Carrier Null)
MC2833
5
MOTOROLA ANALOG IC DEVICE DATA
Figure 9. 144.6 MHz/x12 Multiplier
MC2833P
VCC
IN
GND
OUT
MC2833P
Figure 10. Circuit Side View
Figure 11. Ground Plane on Component Side
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