MC12147 Datasheet, PDF (1/12 Pages) Motorola, Inc – Low Power Voltage Controlled Oscillator Buffer

Freescale Semiconductor, Inc.^{Order this document by MC12147/D}
Low Power Voltage
Controlled Oscillator Buffer
The MC12147 is intended for applications requiring high frequency signal
generation up to 1300 MHz. An external tank circuit is used to determine the
desired frequency of operation. The VCO is realized using an
emitter–coupled pair topology. The MC12147 can be used with an integrated
PLL IC such as the MC12202 1.1 GHz Frequency Synthesizer to realize a
complete PLL sub–system. The device is specified to operate over a voltage
supply range of 2.7 to 5.5 V. It has a typical current consumption of 13 mA at
3.0 V which makes it attractive for battery operated handheld systems.
MC12147
LOW POWER
VOLTAGE CONTROLLED
OSCILLATOR BUFFER
SEMICONDUCTOR
TECHNICAL DATA
DEVICE TO BE PHASED OUT.
NOTE: The MC12147 is NOT suitable as a crystal oscillator.
• Operates Up to 1.3 GHz
• Space–Efficient 8–Pin SOIC or SSOP Package
• Low Power 13 mA Typical @ 3.0 V Operation
• Supply Voltage of 2.7 to 5.5 V
• Typical 900MHz Performance
– Phase Noise –105 dBc/Hz @ 100 kHz Offset
– Tuning Voltage Sensitivity of 20 MHz/V
• Output Amplitude Adjustment Capability
• Two High Drive Outputs With a Typical Range from –8.0 to –2.0 dBm
The device has two high frequency outputs which make it attractive for
transceiver applications which require both a transmit and receive local
oscillator (LO) signal. The outputs Q and QB are available for servicing the
receiver IF and transmitter up–converter single–ended. In receiver
applications, the outputs can be used together if it is necessary to generate a
differential signal for the receiver IF. Because the Q and QB outputs are open
collector, terminations to the VCC supply are required for proper operation.
Since the outputs are complementary, BOTH outputs must be terminated
even if only one is needed. The Q and QB outputs have a nominal drive level
of –8dBm to conserve power. If addition signal amplitude is needed, a level
adjustment pin (CNTL) is available, which when tied to ground, boosts the
nominal output levels to –2.0 dBm.
External components required for the MC12147 are: (1) tank circuit (LC
network); (2) Inductor/capacitor to provide the termination for the open
collector outputs; and (3) adequate supply voltage bypassing. The tank
circuit consists of a high–Q inductor and varactor components. The
preferred tank configuration allows the user to tune the VCO across the full
supply range. VCO performance such as center frequency, tuning voltage
sensitivity, and noise characteristics are dependent on the particular
components and configuration of the VCO tank circuit.
PIN NAMES
Pin
Function
VCC
CNTL
TANK
VREF
QB
GND
Q
Power Supply
Amplitude Control for Q, QB Output Pair
Tank Circuit Input
Bias Voltage Output
Open Collector Output
Ground
Open Collector Output
8
1
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SO–8)
PIN CONNECTIONS
NC Q GND QB
8765
1234
VCC CNTL TANK VREF
(Top View)
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
MC12147D TA = –40 to 85°C
SO–8
© Motorola, Inc. 1999
MOTOROLA RF/IF DEVICE DATA For More Information On This Product,
Go to: www.freescale.com
Rev 4
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