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SP8908 (MP)
5GHZ 4 Fixed Modulus Divider 48 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.
Ordering Information
SP8908/KG/MP1S (tubes) SP8908/KG/MP1T (tape and reel)
Features
G Very High Operating Speed G Operation down to DC with Square Wave Input G Silicon Technology for Low Phase Noise
Absolute Maximum Ratings
Supply voltage, VCC 6*5V Storage temperature 265C to 1150C Maximum junction temperature 1150C Prescaler input voltage 2*5Vp-p Operating temperature KG240C to 185C TCASE
(Typically better than 2140dBc/Hz at 1KHz)
G 5V Single Supply Operation G Low Power Dissipation: 360mW (Typ.) G Surface Mount Plastic Package
OUTPUT VCC VCC
1 8 7 6
OUTPUT OUTPUT
VREF
48
400 INPUT INPUT
2 3
400 10mA
4
4
GND
Figure 1 block diagram
SP8908
VCC INPUT INPUT GND
1 2
8 7
OUTPUT VCC OUTPUT OUTPUT GND
SP8908
3 4
6 5
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: TAMB = 240C to 185C, VCC = 4*75V to 5*25V Value Characteristic Supply current Input frequency Input sensitivity Input sensitivity Input overload Input overload Output voltage Output power Pin 1, 8 2, 3 2, 3 2, 3 2, 3 2, 3 6, 7 6, 7 Min. 1*0 440 700 210*0 Typ. 72 0*5 0 Max. 96 5*0 180 570 12*0 Units mA GHz mVrms mVrms mVrms mVrms Vp-p dBm Conditions
RMS sinewave fIN = 1GHz and 4.2GHz fIN = 5GHz fIN = 1GHz and 3GHz fIN = 5.0GHz and 3.8GHz Into 50 pullup resistor fIN = 1GHz and 5GHz (see note 1 )
NOTE 1. Measured into 50 measuring instrument in parallel with 50 pullup resistor. See Figure 5.
800
VIN INTO 50 (mV RMS)
600
TESTED AS PER TABLE OF ELECTRICAL CHARACTERISTICS
400 OPERATING WINDOW 200
1
2
3
4
5
6
7
FREQUENCY (GHz)
Figure3 Typical input sensitiviy (sinewave drive)
2
SP8908
VCC 15V
1
8
50
50
SIGNAL GENERATOR
1n
2 3
1n
SP8908
7 6 1n 5 10n
50 MEASURING INSTRUMENT
10n
1n
4
Figure 4 Typical application and test circuit
j1 j0.5 3GHz j0.2 5GHz j5 j2
0
0.2
0.5
1
2
5 0*3GHz 2j5
1GHz 2j0.2
2j0.5 2j1
2j2
Figure 5 Typical input impedance
3
L(f) [dBc/Hz]
4
100 1k FREQUENCY (Hz) 10k 100k
SP8908
0
2 10
2 20
2 30
2 40
2 50
2 60
2 70
2 80
2 90
2 100
2 110
2 120
2 130
2 140
2 150
Figure 6 Typical phase noise, input frequency = 3GHz
2 160
2 170
10
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