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參數(shù)資料
| 型號(hào)： | MC2833D |
| 廠商： | MOTOROLA INC |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | Low Power FM Transmitter System |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PDSO16 |
| 封裝： | PLASTIC, SO-16 |
| 文件頁數(shù)： | 3/8頁 |
| 文件大?。?/td> | 305K |
| 代理商： | MC2833D |
MC2833
Figure 1. Test Circuit
3
MOTOROLA ANALOG IC DEVICE DATA
Figure 2. Single Chip VHF Narrowband FM Transmitter
Electret
(alternate)
Microphone
and biasing
470 p
1.0
μ
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
μ
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
μ
100 k
4700 p
4700 p
Crystal:
39 pF
68 pF
+
47
μ
F
0.01
μ
F
Collector 1
Collector 2
Base 2
Emitter 2
Base 1
Emitter 1
Mic Amp
Out
RF Out
0.0047
μ
F
Mod Out
16.605 MHz
5.1
μ
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)
49.7 MHz
76 MHz
144.6 MHz
12.05
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, M1282A–M1289A, 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 set–up by simple scaling of the 3 examples shown.
Lt (
μ
H)
3.3–4.7
5.1
5.6
L1 (
μ
H)
0.22
0.22
0.15
L2 (
μ
H)
0.22
0.22
0.10
Re1
330
150
150
Rb1
390 k
300 k
220 k
Cc1
33 p
68 p
47 p
Cc2
33 p
10 p
10 p
C1
33 p
68 p
68 p
C2
470 p
470 p
1000 p
C3
33 p
12 p
18 p
C4
47 p
20 p
12 p
C5
220 p
120 p
33 p
16.5667
12.6000
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