MC12079
2.8 GHz Prescaler
The MC12079 is a single modulus divide by 64, 128, 256 prescaler for low
power frequency division of a 2.8 GHz (typical) high frequency input signal.
Divide ratio control inputs SW1 and SW2 select the required divide ratio of
÷64, ÷128, or ÷256.
An external load resistor is required to terminate the output. A 1.2 kΩ
resistor is recommended to achieve a 1.6 Vpp output swing, when dividing a
1.1 GHz input signal by the minimum divide ratio of 64, assuming a 12 pF
load. Output current can be minimized dependent on conditions such as
output frequency, capacitive load being driven, and output voltage swing
required. Typical values for load resistors are included in the Vout
specification for various divide ratios at 2.8 GHz input frequency.
• 2.8 GHz Toggle Frequency
•
•
•
MECL PLL COMPONENTS
÷64/128/256 PRESCALER
SEMICONDUCTOR
TECHNICAL DATA
Supply Voltage 4.5 to 5.5 V
Low Power 9mA Typical at VCC = 5.0 V
8
Operating Temperature Range of –40 to 85°C
1
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SO–8)
FUNCTIONAL TABLE
SW1
SW2
Divide Ratio
H
H
64
H
L
128
L
H
128
L
L
256
NOTE:
SW1 & SW2: H = VCC, L = Open.
8
1
MAXIMUM RATINGS
Characteristic
Power Supply Voltage, Pin 2
Operating Temperature Range
Storage Temperature Range
Maximum Output Current, Pin 4
NOTE:
Symbol
Range
VCC
–0.5 to 7.0
Vdc
TA
–40 to 85
°C
Tstg
–65 to 150
°C
IO
4.0
P SUFFIX
PLASTIC PACKAGE
CASE 626
Unit
mA
PIN CONNECTIONS
ESD data available upon request.
IN
VCC
SW1
OUT
1
8
2
7
3
6
4
5
IN
NC
SW2
Gnd
(Top View)
ORDERING INFORMATION
Device
MC12079D
MC12079P
MOTOROLA WIRELESS RF, IF AND TRANSMITTER DEVICE DATA
Operating
Temperature Range
TA = – 40° to +85°C
Package
SO–8
Plastic
MC12079
4.2–17