Motorola MC12079D, MC12079P Datasheet

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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

MC12079

Figure 3. Input Signal Amplitude versus Input Frequency

+15.0
+10.0

+5.0

0

–5.0
–10.0
–15.0
–20.0
–25.0

AMPLITUDE (dBm)

–30.0
–35.0
–40.0
–45.0
–50.0

0 400 800 1200 1600 2000 2400 2800 3200 3600

OPERATING

WINDOW

FREQUENCY (MHz)

Divide Ratio = 64; VCC = 5.0 V; TA = 25°C

+1257.40
+707.11
+397.64
+223.61
+125.74
+70.71
+39.76
+22.36
+12.57
+7.07
+3.98
+2.24
+1.26
+0.71

mVrms

Figure 4. Output Amplitude versus Input Frequency

0 400 800 1200 1600 2000 2400 2800 3200 3600

FREQUENCY (MHz)

2000
1600
1200
800
400
0

mVpp

MOTOROLA RF/IF DEVICE DATA

3

NOTE 2

–T–

SEATING
PLANE

H

58

–B–

14

F

–A–

C

N

D

K

G

0.13 (0.005) B

A

E

B

D

1

e

M

58

H

4

C

A1

B

OUTLINE DIMENSIONS

L

M

A

T

0.25MB

A

SEATING
PLANE

SS

A0.25MCB

MC12079

P SUFFIX

PLASTIC PACKAGE

CASE 626–05

ISSUE K

J

M

M

D SUFFIX

PLASTIC PACKAGE

CASE 751–06

(SO–8)

ISSUE T

M

h

X 45

_

0.10

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.

DIM MIN MAX MIN MAX

A 9.40 10.16 0.370 0.400
B 6.10 6.60 0.240 0.260
C 3.94 4.45 0.155 0.175
D 0.38 0.51 0.015 0.020
F 1.02 1.78 0.040 0.070
G 2.54 BSC 0.100 BSC
H 0.76 1.27 0.030 0.050
J 0.20 0.30 0.008 0.012
K 2.92 3.43 0.115 0.135
L 7.62 BSC 0.300 BSC
M ––– 10 ––– 10
N 0.76 1.01 0.030 0.040

NOTES:

1. DIMENSIONING AND TOLERANCING PER ASME

C

q

L

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 MIN MAX

A 1.35 1.75

A1 0.10 0.25

B 0.35 0.49
C 0.19 0.25
D 4.80 5.00
E

H 5.80 6.20
h
L 0.40 1.25

q

INCHESMILLIMETERS

__

MILLIMETERS

3.80 4.00

1.27 BSCe

0.25 0.50
0 7

__

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MOTOROLA RF/IF DEVICE DATA

MC12079/D