Motorola MC2833D, MC2833P Datasheet

Device

Operating

Temperature Range

Package



SEMICONDUCTOR

TECHNICAL DATA

LOW POWER

FM TRANSMITTER

SYSTEM

ORDERING INFORMATION

MC2833D
MC2833P

TA = – 30 to +75°C

SO–16

Plastic DIP

PIN CONNECTIONS

Order this document by MC2833/D

D SUFFIX

PLASTIC PACKAGE

CASE 751B

(SO–16)

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

V

CC

Tr 2
Collector

Tr 2
Emitter

Tr 2

Base

RF
Output

RF
Osc

1

MOTOROLA ANALOG IC DEVICE DATA

  
 

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 Drain Current (I

CC

= 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 On–Chip 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

V

REF

 Motorola, Inc. 1996 Rev 1

MC2833

2

MOTOROLA ANALOG IC DEVICE DATA

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, TA = 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 (fo = 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 (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)

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 (Vin = 30 mVrms)

Output Swing Voltage (fin = 1.0 kHz)

V

out

p–p 4 0.8 1.2 1.6 Vp–p

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 µA) V

(BR)CBO

15 45 – V

Collector Emitter Breakdown Voltage (IC = 200 µA) V

(BR)CEO

10 15 – V

Collector Substrate Breakdown Voltage (IC = 50 µA) V

(BR)CSO

– 70 – V

Emitter Base Breakdown Voltage (IE = 50 µA) V

(BR)EBO

– 6.2 – V

Collector Base Cut Off Current (VCB = 10 V)

Collector Base Cut Off Current (IE = 0)

I

CBO

– – 200 nA

DC Current Gain (IC = 3.0 mA)

DC Current Gain (VCE = 3.0 V)

h

FE

40 150 – –

AUXILIARY TRANSISTOR DYNAMIC CHARACTERISTICS

Current Gain Bandwidth Product (VCE = 3.0 V)

Current Gain Bandwidth Product (IC = 3.0 mA)

f

T

– 500 – MHz

Collector Base Capacitance (VCE = 3.0 V)

Collector Base Capacitance (IC = 0)

C

CB

– 2.0 – pF

Collector Substrate Capacitance (VCS = 3.0 V)

Collector Substrate Capacitance (IC = 0)

C

CS

– 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

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

V

CC

= 9.0 Vdc

Rb1

470 p

Q1

Re1

2.7 k

4.7 k

Dynamic

Mike

Audio
Input

100 k

Deviation
Adjust

120 k

X1Lt

1.0 k

56 p

51 p

V

REF

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

89

10

11

12

13

14

15

16

f

o

C

L

C

o

R

S

= 16.605 MHz
= 30 pF
= 6.1 pF
= 10 Ω Max

NOTES:

1. Components versus output frequency:

Output RF

X1 (MHz) Lt (µH) L1 (µH) L2 (µH) Re1 Rb1 Cc1 Cc2 C1 C2 C3 C4 C5

49.7 MHz
76 MHz

144.6 MHz

16.5667

12.6000

12.05

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

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 M1 175A, 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.