Motorola MC12078D, MC12078P Datasheet
SEMICONDUCTOR TECHNICAL DATA
1
REV 1
Motorola, Inc. 1996
7/93
The MC12078 is a divide by 256 prescaler. Typical frequency
synthesis applications include elctronically tuned TV/CATV and
communication systems as well as instrumentation.
An internal preamplifier is included which isolates the differential inputs
and provides gain for the input signal. Differential PECL outputs are
provided.
• 1.3GHz Toggle Frequency
• Operating Supply Voltage of 4.5 to 5.5V
• Low–Power 28mA Typical at V
CC
= 5.0V
• Operating Temperature Range of 0°C to +85°C
• High Input Sensitivity
• 800mV Minimum Peak–to–Peak Output Swing
• Differential PECL Outputs
DESIGN GUIDE
Criteria Value Unit
Internal Gate Count* 62 ea
Internal Gate Propagation Delay 250 ps
Internal Gate Power Dissipation 10 mW
Speed Power Product 2.5 pJ
* Equivalent to a two–input NAND gate
MAXIMUM RATINGS
Symbol Characteristic Range Unit
V
CC
Power Supply Voltage 7.0 Vdc
T
A
Operating Temperature Range 0 to +85 °C
T
stg
Storage Temperature Range –65 to +175 °C
ELECTRICAL CHARACTERISTICS (V
CC
= 4.5 to 5.5V; TA = 0 to +85°C)
Symbol
Characteristic Min Typ* Max Unit
f
max
1
f
min
Toggle Frequency
(Sine Wave Input)
1.3 1.6
90
GHz
MHz
I
CC
Supply Current at 5.5V 28 35 mA
V
out
Output Voltage
(Load =10pF)
0.8 1.2 V
PP
Vin
min
Input Voltage 90MHz
Sensitivity 150–1100MHz
1.3GHz
10
4.0
7.0
20
10
20
mV
rms
Vin
max
Input 90–500MHz
Overload 500–1300MHz
400
400
mV
rms
* Typical measured at +25°C, 5.0V
1. See Figure 1
MECL PLL COMPONENTS
÷256
PRESCALER
Pinout: 8–Lead Plastic (Top View)
8
1
V
CC
NC
72635
4
NC
GND
Output
Input
P SUFFIX
8–LEAD PLASTIC PACKAGE
CASE 626–05
D SUFFIX
8–LEAD PLASTIC SOIC PACKAGE
CASE 751–05
MC12078
MOTOROLA HIPERCOMM
BR1334 — Rev 4
2
6
4
32
÷
256
0.001µF0.001µF
Signal
Input
V
CC
8
Output
GND
PRESCALER BLOCK DIAGRAM
7
625
Ω
625
Ω
Figure 1. MC12078 Input Signal Amplitude versus Input Frequency
15
10
5
0
–5
–10
–15
–20
–25
–30
–35
–40
–45
–50
1250
710
400
225
125
71
40
22.5
12.8
7.1
4
2.25
1.25
0.71
2000
1600
1200
800
0
2000
FREQUENCY (MHz)
AMPLITUDE (dBm)
OUTPUT
RMS
MILLIVOL TS
400
400 600 800 1000 1200 1400
INPUT
PP
SPECIFICATION
ROLL OFF OF H.P. GENERATOR
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