mc12148 Freescale Semiconductor, Inc, mc12148 Datasheet

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mc12148

Manufacturer Part Number
mc12148
Description
Low Power Voltage Controlled Oscillator
Manufacturer
Freescale Semiconductor, Inc
Datasheet

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mc12148DR2G
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Low Power
Voltage Controlled Oscillator
inductor (L) and capacitor (C). A varactor diode may be incorporated into the
tank circuit to provide a voltage variable input for the oscillator (VCO). This
device may also be used in many other applications requiring a fixed
frequency clock.
i n c l u d e e l e c t r o n i c t e s t e q u i p m e n t a n d d i g i t a l h i g h – s p e e d
telecommunications.
MC12148 has been realized utilizing Motorola’s MOSAIC III advanced
bipolar process technology which results in a design which can operate at a
much higher frequency than the MC1648 while utilizing half the current.
Please consult with the MC1648 data sheet for additional background
information.
output structure and instead has an on–chip termination resistor with a
nominal value of 500 ohms. This facilitates direct ac–coupling of the output
signal into a transmission line. Because of this output configuration, an
external pull–down resistor is not required to provide the output with a dc
current path. This output is intended to drive one ECL load. If the user
needs to fanout the signal, an ECL buffer such as the MC10EL16 Line
Receiver/Driver should be used.
The MC12148 requires an external parallel tank circuit consisting of the
The MC12148 is ideal in applications requiring a local oscillator. Systems
The MC12148 is based on the VCO circuit topology of the MC1648. The
The ECL output circuitry of the MC12148 is not a traditional open emitter
NOTE: The MC12148 is NOT useable as a crystal oscillator.
Typical Operating Frequency Up to 1100 MHz
Low–Power 20 mA at 5.0 Vdc Power Supply
8–Pin SOIC Package
Phase Noise –90 dBc/Hz at 25 kHz Typical
V CC = 4.5 to 5.5 V
VCCO
0.01µF
0.01µF
0.1µF
0.1µF
100µF
GND VCCO Out
V CC
BLOCK DIAGRAM
8
1
(Typical Test Circuit)
100
µF
AGC TANK V ref
7
2
0.1
µF
6
3
1200Ω*
51KΩ
GND
5
4
* The 1200 Ω resistor
and the scope
termination impedance
constitute a 25:1
attenuator probe.
V in
F out
0.1µF
MC12148D
MC12148SD
Motorola, Inc. 1997
Device
VOLTAGE CONTROLLED
ORDERING INFORMATION
MC12148
PLASTIC PACKAGE
PLASTIC PACKAGE
PIN CONNECTIONS
GND
V CC
SEMICONDUCTOR
Temperature Range
T A = – 40 to +85 C
TECHNICAL DATA
Order this document by MC12148/D
LOW POWER
OSCILLATOR
8
1
SD SUFFIX
D SUFFIX
CASE 751
8
CASE 940
(SSOP–8)
Operating
8
VCCO
(SO–8)
AGC
(Top View)
7
2
1
1
TANK
Out
6
3
GND
V ref
5
4
Package
SSOP–8
SO–8
Rev 5

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mc12148 Summary of contents

Page 1

... The MC12148 is based on the VCO circuit topology of the MC1648. The MC12148 has been realized utilizing Motorola’s MOSAIC III advanced bipolar process technology which results in a design which can operate at a much higher frequency than the MC1648 while utilizing half the current ...

Page 2

... Output Level LOW (1.0 MΩ Impedance) CSR @ 25 kHz Offset, 1 CSR @ 1.0 MHz Offset, 1 SNR (Signal to Noise Ratio from Carrier) Frequency Stability Second Harmonic (from Carrier) Q11 Q10 GND V ref 2 MC12148 Symbol Value Unit V CC –0.5 to 7.0 Vdc T A – stg –65 to 150 C Symbol ...

Page 3

... MC12148 5.0 Vdc 930 MHz CW) 0 –20 –40 –60 –80 –100 –120 –140 1K 10K Tank Component Suppliers Below are suppliers who manufacture tuning varactors and inductors which can be used to build an external tank circuit. Motorola has used these varactors and inductors for evaluation purposes, however, there are other vendors who manufacture similar products ...

Page 4

... PIN IDENT –U– A –V– 0.20 (0.008 0.076 (0.003) –T– SEATING PLANE MC12148 OUTLINE DIMENSIONS D SUFFIX PLASTIC PACKAGE CASE 751–06 (SO–8) ISSUE SEATING PLANE L 0.10 SD SUFFIX PLASTIC PACKAGE CASE 940-03 (SSOP– ...

Page 5

... Motorola, Inc. Motorola, Inc Equal Mfax is a trademark of Motorola, Inc. JAPAN: Nippon Motorola Ltd.: SPD, Strategic Planning Office, 141, 4–32–1 Nishi–Gotanda, Shagawa–ku, Tokyo, Japan. 03–5487–8488 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, MC12148/D 5 ...

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