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SP8908 (MP)
5GHZ
4 4
4 4
48 Fixed Modulus Divider
Preliminary Information
DS4359 Issue 1.3 September 1999
The SP8908 is one of a range of very high speed low
power prescalers for professional applications. The dividing
elements are static D type flip flops and therefore allow
operation down to DC if the drive signal is a pulse waveform
with fast risetime. The output stage has a differential current
output and provides a direct drive into a 50 ohm load.
Features
● Very High Operating Speed
● Operation down to DC with Square Wave Input
● Silicon Technology for Low Phase Noise
(Typically better than 2140dBc/Hz at 1KHz)
● 5V Single Supply Operation
● Low Power Dissipation: 360mW (Typ.)
● Surface Mount Plastic Package
Absolute Maximum Ratings
Supply voltage, V
CC
Storage temperature
Maximum junction temperature
Prescaler input voltage
Operating temperature
6·5V
265°C to 1150°C
1150°C
2·5Vp-p
KG240°C to 185°C T
CASE
Figure 1 block diagram
48
Ordering Information
SP8908/KG/MP1S (tubes)
SP8908/KG/MP1T (tape and reel)
400400
V
CC
V
REF
OUTPUT
V
CC
10mA
OUTPUT
OUTPUT
18
7
6
2
3
INPUT
INPUT
44
GND
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2
SP8908
1
2
3
4
8
7
6
5
OUTPUT V
CC
OUTPUT
OUTPUT
GND
V
CC
INPUT
INPUT
GND
MP8
Figure 2 Pin connections - top view
Electrical Characteristics
These characteristics are guaranteed by either production test or design over the following range of operating conditions
unless otherwise stated:
T
AMB
= 240°C to 185°C, VCC = 4·75V to 5·25V
-
1·0
-
440
700
-
210·0
Characteristic
RMS sinewave
fIN = 1GHz and 4.2GHz
fIN = 5GHz
fIN = 1GHz and 3GHz
fIN = 5.0GHz and 3.8GHz
Into 50Ω pullup resistor
fIN = 1GHz and 5GHz (see note 1 )
96
5·0
180
570
-
-
-
12·0
ConditionsPin
1, 8
2, 3
2, 3
2, 3
2, 3
2, 3
6, 7
6, 7
Supply current
Input frequency
Input sensitivity
Input sensitivity
Input overload
Input overload
Output voltage
Output power
Typ. Max.
Min.
Value
Units
mA
GHz
mVrms
mVrms
mVrms
mVrms
Vp-p
dBm
72
-
-
-
-
-
0·5
0
NOTE
1. Measured into 50Ω measuring instrument in parallel with 50Ω pullup resistor. See Figure 5.
800
600
400
200
V
IN
INTO 50Ω (mV RMS)
12 3 4 56 7
FREQUENCY (GHz)
OPERATING WINDOW
TESTED AS PER
TABLE OF
ELECTRICAL
CHARACTERISTICS
Figure3 Typical input sensitiviy (sinewave drive)
SP8908
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3
SP8908
1
2
3
4
8
7
6
5
V
CC
15V
1n10n
1n
SIGNAL
GENERATOR
50 50
1n
1n
10n
50Ω MEASURING
INSTRUMENT
Figure 4 Typical application and test circuit
j2
j1
j0.5
j0.2
0
2j0.2
2j0.5
2j1
2j2
1
0.5
0.2
j5
2j5
2
5
0·3GHz
3GHz
5GHz
1GHz
Figure 5 Typical input impedance
SP8908
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4
SP8908
Figure 6 Typical phase noise, input frequency = 3GHz
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
L(f) [dBc/Hz]
10
100 1k 10k 100k
FREQUENCY (Hz)
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