SP8402
Very Low Phase Noise Divider by 2N
The SP8402 is a very low phase noise divider which divides
by powers of two. The S0, S1, S2 data inputs select the division
ratio in the range 21 to 28. Special circuits techniques have been
used to reduce the phase noise considerably below that
produced by standard dividers. The data inputs are CMOS or
TTL compatible.
The SP8402 is packaged in a 28 pin plastic SO package to
be compatible with the SP8400 and SP8401 devices.
FEATURES
■Very low Phase Noise (Typically -155 to 160dBc/Hz at 1kHz
offset)
■Supply Voltage 5V
ABSOLUTE MAXIMUM RATINGS
Supply Voltage 6.5V
Output Current 20mA
Storage Temperature Range -55°C to +125°C
Maximum Clock Input Voltage 2.5V p-p
ORDERING INFORMATION
SP8402 KG MPES (Commercial Grade)
MP28
Fig.1 Pin connections - top view
DS3738 - 2.1 March 1994
1
2
3
4
5
6
7
8
9
10
11
12
13
14 15
16
17
18
19
20
21
22
23
24
25
26
27
28
N/C
N/C
N/C
V
CC
+5V
GND
CLOCK INPUT
CLOCK INPUT
CLOCK INPUT
GND
V
CC
+5V
V
CC
+5V
N/C
S0
N/C
N/C
N/C
N/C
N/C
N/C
N/C
OUTPUT
OUTPUT
N/C
V
CC
+5V
N/C
S2
S1
CLOCK INPUT
Fig.2 Typical single sideband phase noise measured at 768MHz
(f) (dBc/Hz) –3dB
Frequency (Hz)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
–140
–150
–160
–170
10 100 1k 10k 100k
2
SP8400
Fig.3 Typical input sensitivity
ELECTRICAL CHARACTERISTICS
Guaranteed over: Supply voltage VCC = +4.75V to +5.25V Temperature Tamb = -10°C to +75°C
Tested at +4.75V and +5.25V at Tamb = +25°C
FREQUENCY MHz
400
300
200
100
0 200 400 600 800 1000 1200 1400
355mV
140mV
OPERATING WINDOW
1600
500
600
Vin mV rms
Min. Typ. Max.
Supply current
Output voltage swing
Input sensitivity 200MHz to 1.5GHz
Data Inputs
Logic high voltage
Low low voltage
Input current
92
410 102
140
(-4)
0.8
180
82
320
2.2
4, 11, 12, 18
20, 21
7, 8
Output loaded with 300R See Fig.5
p-p @ 1.4GHz input ÷ 256 mode
outputs loaded with 330R See Fig.5
RMS Sine wave into 50 Ohms
(dBm equivalent) See Fig.3
5V Data input voltage
mA
mV
mV
dBm
V
V
µA
Units
Value Conditions
Characteristic Pin
S0
L
H
L
H
L
H
L
H
S1
L
L
H
H
L
L
H
H
S2
L
L
L
L
H
H
H
H
DIVISION RATIO
2
4
8
16
32
64
128
256
Fig.4 Truth table
3
SP8400
Fig.5 Test circuit
1
2
3
4
5
6
7
8
9
10
11
12
13
14 15
16
17
18
19
20
21
22
23
24
25
26
27
28
SP8402
10nF10nF1nF 1nF 2x330R
1nF
TTL/CMOS
MODULUS
CONTROL
220nF
50R
OUTPUT
VCC
RF
50R
SIGNAL
GENERATOR
4
SP8400
Fig.5 Typical application combining output to increase signal and retain low phase noise
1
2
3
4
5
6
7
8
9
10
11
12
13
14 15
16
17
18
19
20
21
22
23
24
25
26
27
28
SP8402
10nF10nF1nF 1nF 2x330R
1nF
S0
S1
S2
50R
10nF
OUTPUT
10 F
+5V
CLOCK
INPUT
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