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Low Power Voltage Controlled Oscillator
The MC12148 requires an external parallel tank circuit consisting of the 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. The MC12148 is ideal in applications requiring a local oscillator. Systems include electronic test equipment and digital high-speed telecommunications. 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. Please consult with the MC1648 data sheet for additional background information. The ECL output circuitry of the MC12148 is not a traditional open emitter 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. NOTE: The MC12148 is NOT useable as a crystal oscillator.
MC12148
LOW POWER VOLTAGE CONTROLLED OSCILLATOR
SEMICONDUCTOR TECHNICAL DATA
8 1
D SUFFIX PLASTIC PACKAGE CASE 751 (SO-8)
8 1
* * * *
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
SD SUFFIX PLASTIC PACKAGE CASE 940 (SSOP-8)
PIN CONNECTIONS BLOCK DIAGRAM
VCCO 0.01F 0.1F (Typical Test Circuit) 100F 1200* Fout GND VCCO 8 7 Out 6 GND 5
8
7
6
5 GND
GND VCCO Out
* The 1200 resistor and the scope termination impedance constitute a 25:1 attenuator probe.
1 VCC
2 AGC
3 TANK
4 Vref
(Top View)
VCC = 4.5 to 5.5 V 0.01F 0.1F
VCC 1 100 F
AGC TANK Vref 2 3 4 0.1F 0.1 F Vin 51K Device
ORDERING INFORMATION
Operating Temperature Range TA = - 40 to +85C Package SO-8 SSOP-8
Rev 5
MC12148D MC12148SD
(c) Motorola, Inc. 1997
MC12148
MAXIMUM RATINGS Parameter
Power Supply Voltage, Pins 1, 7 Operating Temperature Range Storage Temperature Range
NOTE: ESD data available upon request.
Symbol
VCC TA Tstg
Value
-0.5 to 7.0 -40 to 85 -65 to 150
Unit
Vdc C C
ELECTRICAL CHARACTERISTICS (VCC = 5.0 V; TA = -40 to 85C, unless otherwise noted.)
Characteristic Supply Current Output Level HIGH (1.0 M Impedance) Output Level LOW (1.0 M Impedance) CSR @ 25 kHz Offset, 1.0 Hz BW CSR @ 1.0 MHz Offset, 1.0 Hz BW SNR (Signal to Noise Ratio from Carrier) Frequency Stability Supply Drift Thermal Drift Second Harmonic (from Carrier) Symbol ICC VOH VOL Min - 3.95 3.04 - - - - - - Typ 19 4.17 3.41 -90 -120 40 3.6 0.1 -25 Max 25 4.61 3.60 - - - - - - Unit mA V V dBc/Hz dBc/Hz dB KHz/mV KHz/C dBc
L(f) L(f)
SNR Fsts Fstt H2
Figure 1. Circuit Schematic
VCC 1 VCCO 7
Q9 Q3 Q2
Q1
6 OUT Q4 Q11 Q10 Q7 Q6 D1 Q5 D2 Q8 510
8 GND
4 Vref
3 TANK
5 GND
2 AGC
2
MOTOROLA RF/IF DEVICE DATA
MC12148
Figure 2. Typical Evaluation Results
(CSR MC12148 5.0 Vdc; VCC @ 25C; 930 MHz CW) 0 -20 -40 dBc/Hz -60 -80 -100 -120 -140
1K
10K
100K
1M
10M
100M
L (f) [dBc/Hz] versus f [Hz]
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. Coilcraft Inductors A01T thru A05T Coilcraft-Coilcraft, Inc. 1102 Silver Lake Rd. Gary, Illinois 60013 708-639-6400 Loral Tuning Varactors GC1500 Series Loral 16 Maple Road Chelmsford, Massachusetts 01824 508-256-8101 or 508-256-4113 Alpha Tuning Diodes DVH6730 Series Alpha Semiconductor Devices Division 20 Sylvan Road Woburn, MA 01801 617-935-5150
* At 1.1 GHz, use a Coilcraft A0IT Springair coil at 2.5 nH and a Loral Varactor 3.0 to 8.0 pF at VIN = 1.0 to 5.0 V.
MOTOROLA RF/IF DEVICE DATA
3
MC12148
OUTLINE DIMENSIONS
D SUFFIX PLASTIC PACKAGE CASE 751-06 (SO-8) ISSUE T A
8
D
5
C
E
1 4
H
0.25
M
B
M
h B C e A
SEATING PLANE
X 45 _
NOTES: 1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M, 1994. 2. DIMENSIONS ARE IN MILLIMETER. 3. DIMENSION D AND E DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE. 5. DIMENSION B DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 TOTAL IN EXCESS OF THE B DIMENSION AT MAXIMUM MATERIAL CONDITION. DIM A A1 B C D E e H h L MILLIMETERS MIN MAX 1.35 1.75 0.10 0.25 0.35 0.49 0.19 0.25 4.80 5.00 3.80 4.00 1.27 BSC 5.80 6.20 0.25 0.50 0.40 1.25 0_ 7_
q
L 0.10 A1 B 0.25
M
CB
S
A
S
q
SD SUFFIX PLASTIC PACKAGE CASE 940-03 (SSOP-8) ISSUE B
8X
K REF 0.12 (0.005)
0.25 (0.010)
M
TU
S
V
S
N M
L/2 L
PIN 1 IDENT 1
8
5
N F B DETAIL E
4
K A -V- 0.20 (0.008)
M
-U-
J
J1
TU
S
K1
NOTES: 1 DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2 CONTROLLING DIMENSION: MILLIMETER. 3 DIMENSION A DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH OR GATE BURRS SHALL NOT EXCEED 0.15 (0.006) PER SIDE. 4 DIMENSION B DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSION. INTERLEAD FLASH OR PROTRUSION SHALL NOT EXCEED 0.15 (0.006) PER SIDE. 5 DIMENSION K DOES NOT INCLUDE DAMBAR PROTRUSION/INTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.13 (0.005) TOTAL IN EXCESS OF K DIMENSION AT MAXIMUM MATERIAL CONDITION. DAMBAR INTRUSION SHALL NOT REDUCE DIMENSION K BY MORE THAN 0.07 (0.002) AT LEAST MATERIAL CONDITION. 6 TERMINAL NUMBERS ARE SHOWN FOR REFERENCE ONLY. 7 DIMENSION A AND B ARE TO BE DETERMINED AT DATUM PLANE -W-. DIM A B C D F G H J J1 K K1 L M MILLIMETERS MIN MAX 2.87 3.13 5.20 5.38 1.73 1.99 0.05 0.21 0.63 0.95 0.65 BSC 0.44 0.60 0.09 0.20 0.09 0.16 0.25 0.38 0.25 0.33 7.65 7.90 0_ 8_ INCHES MIN MAX 0.113 0.123 0.205 0.212 0.068 0.078 0.002 0.008 0.024 0.037 0.026 BSC 0.017 0.023 0.003 0.008 0.003 0.006 0.010 0.015 0.010 0.013 0.301 0.311 0_ 8_
0.076 (0.003) -T-
SEATING PLANE
C D G H
DETAIL E
4
EEEE CCCC EEEE CCCC
SECTION N-N
-W-
MOTOROLA RF/IF DEVICE DATA
MC12148
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MOTOROLA RF/IF DEVICE DATA
MC12148/D 5

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