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
Freescale Semiconductor, Inc.
MC12079
ELECTRICAL CHARACTERISTICS
(VCC = 4.5 to 5.5 V; TA = –40 to 85°C, unless otherwise noted.)
Parameter
Symbol
Min
0.25
–
400
100
VCC
Open
1.0
Typ
3.4
9.0
–
–
VCC
Open
1.6
Max
2.8
11.5
1000
1000
VCC
Open
–
Unit
GHz
mA
mVpp
V
–
Vpp
ARCHIVED BY
(Sine Wave)
Toggle Frequency
FREESCALE SEMICONDUCTOR, INC. 2005
ft
Supply Current Output (Pin 2)
Input Voltage Sensitivity
Divide Ratio Control Input High (SW)
Divide Ratio Control Input Low (SW)
Output Voltage Swing
(CL = 12 pF; RL = 1.2 kΩ; IO = 2.7 mA)
1
(CL = 12 pF; RL = 2.2 kΩ; IO = 1.5 mA)
2
(CL = 12 pF; RL = 3.9 kΩ; IO = 0.85 mA)
3
NOTES:
1. Divide ratio of
÷64
at 2.8 GHz.
2. Divide ratio of
÷128
at 2.8 GHz.
3. Divide ratio of
÷256
at 2.8 GHz.
ICC
250–500 MHz
500–2800 MHz
Vin
VIH
VIL
Vout
ARCHIVE INFORMATION
Freescale Semiconductor, Inc...
ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005
Figure 1. Logic Diagram (MC12079)
D
In
In
C
QB
Q
D
C
Q
QB
D
C
QB
Q
D
C
Q
QB
D
C
QB
Q
D
C
SW2
SW1
QB
Q
D
C
QB
Q
D
C
QB
Q
Out
Figure 2. AC Test Circuit
VCC = 4.5 to 5.5 V
C3
SINE WAVE GENERATOR
C1
IN
50
Ω
SW2
C2
IN
GND
OUT
CL
RL
EXTERNAL COMPONENTS
C1 = C2 = 1000 pF
C3 = 0.1
µF
CL = 12 pF (Including Scope and Jig Capacitance)
RL = 1.2 kΩ (for
÷64
at 2.8 GHz)
VCC
SW1
2
For More Information On This Product,
MOTOROLA RF/IF DEVICE DATA
Go to: www.freescale.com
ARCHIVE INFORMATION
Freescale Semiconductor, Inc.
MC12079
Figure 3. Input Signal Amplitude versus Input Frequency
+15.0
ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005
+10.0
+1257.40
+707.11
+397.64
+223.61
+125.74
+70.71
mVrms
+39.76
+22.36
+12.57
0
–5.0
AMPLITUDE (dBm)
–10.0
–15.0
–20.0
–25.0
–30.0
–35.0
–40.0
–45.0
–50.0
0
ARCHIVE INFORMATION
Freescale Semiconductor, Inc...
+3.98
+2.24
+1.26
400
800
1200
1600
2000
2400
2800
3200
+0.71
3600
ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005
FREQUENCY (MHz)
Divide Ratio = 64; VCC = 5.0 V; TA = 25°C
Figure 4. Output Amplitude versus Input Frequency
2000
1600
mVpp
1200
800
400
0
3600
0
400
800
1200
1600
2000
2400
2800
3200
FREQUENCY (MHz)
MOTOROLA RF/IF DEVICE DATA
For More Information On This Product,
3
Go to: www.freescale.com
ARCHIVE INFORMATION
ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉ
OPERATING
WINDOW
+5.0
+7.07
Freescale Semiconductor, Inc.
MC12079
OUTLINE DIMENSIONS
P SUFFIX
ARCHIVED BY FREESCALE SEMICONDUCTOR,
PACKAGE
INC. 2005
PLASTIC
8
5
–B–
1
4
CASE 626–05
ISSUE K
NOTES:
1. DIMENSION L TO CENTER OF LEAD WHEN
FORMED PARALLEL.
2. PACKAGE CONTOUR OPTIONAL (ROUND OR
SQUARE CORNERS).
3. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
F
NOTE 2
–A–
L
DIM
A
B
C
D
F
G
H
J
K
L
M
N
C
–T–
J
N
D
H
G
0.13 (0.005)
M
ARCHIVE INFORMATION
SEATING
PLANE
Freescale Semiconductor, Inc...
K
T A
M
M
B
ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005
M
A
8
D
5
D SUFFIX
PLASTIC PACKAGE
CASE 751–06
(SO–8)
ISSUE T
C
E
1
4
H
0.25
M
B
M
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
_
h
B
C
e
A
SEATING
PLANE
X 45
_
q
L
0.10
A1
B
0.25
M
C B
S
A
S
q
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the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters which may be provided in Motorola
data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals”
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arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that
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are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal
Opportunity/Affirmative Action Employer.
Mfax is a trademark of Motorola, Inc.
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