Sept. 1995
Edition 3.0a
DATA SHEET
MB508
2.3GHz TWO MODULUS PRESCALER
2.3GHz TWO MODULUS PRESCALER
The Fujitsu MB508 is a 2.3GHz two modulus prescaler used with a frequency
synthesizer to form a Phase Locked Loop (PLL) and divides the input frequency
by a modulus of 128/130, 256/258 or 512/514. The output level is 1.6V peak to
peak ECL level. The ultra high frequency operation provides wide application,
such as Direct Broadcasting Satellite System, CATV system, UHF Transceiver,
etc.
FEATURES
S
S
S
S
S
S
S
S
High Frequency Operation:
Input Signal Amplitude:
Pulse Swallow Function:
Power Dissipation:
Wide Operation Temperature:
Stable Output Amplitude:
f = 2.3GHz max. (P
IN
= –4dBm min.)
V
IN
= 100mV
p–p
(f
IN
= 100MHz to 1.8GHz)
128/130, 256/258, 512/514
120mW typ.
-40°C to +85°C
V
OUT
= 1.6V
p–p
typ.
PLASTIC PACKAGE
DIP-08P-M01
PLASTIC PACKAGE
FPT-08P-M01
Complete PLL synthesizer circuit with the Fujitsu MB87001A, PLL
synthesizer system block IC
Standard Plastic 8-pin Dual-In-Line Package or Flat Package
PIN ASSIGNMENT
ABSOLUTE MAXIMUM RATINGS (See Note)
Rating
Power Supply Voltage
Input Voltage
Output Current
Operating Temperature
Storage Temperature
Note:
IN
1
2
TOP VIEW
3
4
8
7
6
5
IN
SW2
MC
GND
Symbol
V
CC
V
IN
I
O
T
A
T
STG
Value
–0.5 to +7.0
–0.5 to V
CC
10
–40 to +85
–55 to +125
Unit
V
V
mA
°C
°C
V
CC
SW1
OUT
Permanent device damage may occur if the above
Absolute Maximum Ratings
are
exceeded. Functional operation should be restricted to the conditions as detailed in
the operational sections of this data sheet. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
This device contains circuitry to protect the inputs against
damage due to high static voltages or electric fields. However,
it is advised that normal precautions be taken to avoid
application of any voltage higher than maximum rated voltages
to this high impedance circuit.
Copyright
E
1995 by FUJITSU LIMITED and FUJITSU MICROELECTRONICS
MB508
RECOMMENDED OPERATING CONDITIONS
Values
Parameter
Power Supply Voltage
Output Current
Operating Temperature
Load Capacitance
Symbol
Min.
V
CC
I
O
T
A
C
L
–40
4.5
Typ.
5.0
1.2
+85
12
Max.
5.5
V
mA
°C
pF
Unit
ELECTRICAL CHARACTERISTICS
(Recommended Operating Conditions unless otherwise noted.)
Values
Parameter
Power Supply Current
Output Amplitude
Input Frequency
Symbol
I
CC
V
O
f
IN
P
INA
Input Signal Amplitude
P
INB
High Level Input Voltage for MC
Low Level Input Voltage for MC
High Level Input Voltage for SW
Low Level Input Voltage for SW
High Level Input Current for MC
Low Level Input Current for MC
High Level Input Current for SW
Modulus Set-up Time MC to
Output at 2.3GHz Operation
Note:
*Design Guarantee
Condition
Min.
Typ.
24
1.0
with input coupling
capacitor 1000pF
f
IN
= 1800MHz to
2300MHz
f
IN
= 100MHz to
1800MHz
100
–4
–16
2.0
0.8
V
CC
–0.1
V
CC
Open
V
IH
= 2.0V
V
IL
= 0.8V
V
IH
= V
CC
18
–0.2
250
28
0.4
V
CC
+0.1
1.6
2300
5.5
Max.
Unit
mA
V
p–p
MHz
dBm
10
V
V
V
V
mA
mA
µA
ns
V
IHM
V
ILM
V
IHS
*
V
ILS
I
IHM
I
ILM
I
IHS
t
SET
3
MB508
V
CC
= +5.0V + 10%
Sampling scope input point
for input waveform
V
CC
C
1
P.G.
50Ω
C
2
IN
IN
MC GND
OUT
SW1
SW2
C
3
Sampling scope prober point
for output waveform
R
L
C
L
MC Input
C
1
: 1000pF
C
2
: 1000pF
C
3
: 0.1µF
C
L
: 12pF (including scope and jig capacitance)
R
L
: 2KΩ
Figure 2. Test Circuit
TIMING CHART (2 MODULUS)
Example: Divide ratio = 128/130
128
IN
130
64
OUT
64 64 64 64
64
64
66
64 64 66 64 66 64 64
MC
t
SET
t
SET
Note:
When divide of 130 is selected, positive pulse is applied by two to 66.
The typical set up time is 18 ns from the MC signal input to the timing of change of prescaler divide ratio.
4
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