Motorola MC12079D, MC12079P Datasheet
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 V
specification for various divide ratios at 2.8 GHz input frequency .
• 2.8 GHz Toggle Frequency
• Supply Voltage 4.5 to 5.5 V
• Low Power 9mA Typical at V
CC
= 5.0 V
• Operating Temperature Range of –40 to 85°C
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.
out
Order this document by MC12079/D
MECL PLL COMPONENTS
÷64/128/256 PRESCALER
SEMICONDUCTOR
TECHNICAL DATA
8
1
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SO–8)
8
1
MAXIMUM RATINGS
Characteristic Symbol Range Unit
Power Supply Voltage, Pin 2 V
Operating Temperature Range T
Storage Temperature Range T
Maximum Output Current, Pin 4 I
NOTE: ESD data available upon request.
CC
A
stg
O
–0.5 to 7.0 Vdc
–40 to 85 °C
–65 to 150 °C
4.0 mA
Device
MC12079D
MC12079P
P SUFFIX
PLASTIC PACKAGE
CASE 626
PIN CONNECTIONS
(Top View)
8
IN
7
NC
6
SW2
5
Gnd
IN
V
CC
SW1
OUT
1
2
3
4
ORDERING INFORMATION
Operating
Temperature Range
TA = – 40° to +85°C
Package
SO–8
Plastic
Motorola, Inc. 1997 Rev 3
MC12079
ELECTRICAL CHARACTERISTICS (VCC = 4.5 to 5.5 V; TA = –40 to 85°C, unless otherwise noted.)
Parameter Symbol Min Typ Max Unit
Toggle Frequency (Sine Wave) ft 0.25 3.4 2.8 GHz
Supply Current Output (Pin 2) I
Input Voltage Sensitivity 250–500 MHz
Divide Ratio Control Input High (SW) V
Divide Ratio Control Input Low (SW) V
Output Voltage Swing
(CL = 12 pF; RL = 1.2 kΩ; IO = 2.7 mA)
(CL = 12 pF; RL = 2.2 kΩ; IO = 1.5 mA)
(CL = 12 pF; RL = 3.9 kΩ; IO = 0.85 mA)
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.
500–2800 MHz
1
2
3
Figure 1. Logic Diagram (MC12079)
V
CC
V
in
IH
IL
out
– 9.0 11.5 mA
400
100
V
CC
Open Open Open –
1.0 1.6 – V
–
–
V
CC
1000
1000
V
CC
mVpp
V
pp
In
In
SW2
SW1
SINE WAVE GENERATOR
50
Ω
C1
C2
IN
IN
DQB
CQ
DQB
CQ
Figure 2. AC Test Circuit
V
CC
GND
DQ
CQB
DQB
CQ
SW1
SW2
OUT
DQB
C
C3
C
L
Q
CQB
DQB
CQ
VCC = 4.5 to 5.5 V
R
L
DQ
EXTERNAL COMPONENTS
C1 = C2 = 1000 pF
C3 = 0.1
CL = 12 pF (Including Scope and Jig Capacitance)
RL = 1.2 k
DQB
Q
C
Out
µ
F
Ω
(for ÷64 at 2.8 GHz)
2
MOTOROLA RF/IF DEVICE DATA
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