MITEL SP8400 Datasheet

Very Low Phase Noise Synthesiser Divider

The SP8400 is a very low phase noise programmable
divider which is based on a divide by 8/9 dual modulus
prescaler and a 12 stage control counter. This gives a minimum
division ratio of 56 (64 for fractional - N synthesis applications),
and a maximum division ratio of 4103. Special circuit
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 SP8400 is packaged in a 28 pin plastic SO package.

FEATURES

■ Very low Phase Noise (Typically -156dBc/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

M2
M1
M0

+5V

V

CC

GND

INPUT

CLOCK
CLOCK INPUT
CLOCK INPUT

INPUT

CLOCK

GND

V

+5V

CC

+5V

V

CC

GND

A0

Fig.1 Pin connections - top view

1
2
3
4
5
6
7
8

9
10
11
12
13
14 15

28
27
26
25
24
23
22
21
20
19
18
17
16

SP8400

DS3739 - 2.1 April 1994

M3
M4
M5
M6
M7
M8
N/C
OUTPUT
OUTPUT
N/C
V

+5V

CC

N/C
A2
A1

MP28

ORDERING INFORMATION

SP8400 KG MPES(Commercial Grade)

0
–10
–20
–30
–40
–50
–60
–70
–80
–90

–100

(f) (dBc/Hz) –3dB

–110
–120
–130
–140
–150
–160
–170

10 100 1k 10k 100k

Frequency (Hz)

Fig.2 Typical single sideband phase noise measured at 300MHz

SP8400

ELECTRICAL CHARACTERISTICS

Guaranteed over: Supply voltage VCC = +4.75V to +5.25V Temperature T
Tested at +4.75V and +5.25V at T

= +25°C

amb

= -10°C to +75°C

amb

Characteristic

Supply current
Output voltage swing

Input sensitivity 200MHz to 1.5GHz

Data Inputs

Logic high voltage
Low low voltage
Input current

600

500

400

300

mV rms

in

V

200

100

Pin

4, 11, 12, 18

20, 21

7, 8

Value

Min. Typ. Max.

137

122
320

152

410

140
(-4)

2.2

0.8

180

OPERATING WINDOW

Units

mA
mV

mV

dBm

V
V

µA

Conditions

Output loaded with 300R See Fig.4
p-p @ 1.5GHz input ÷ 71 mode
See Fig.4
RMS Sine wave into 50 Ohms
(dBm equivalent) See Fig.3

5V Data input voltage

355mV

140mV

0 200 400 600 800 1000 1200 1400

FREQUENCY MHz

1600

Fig.3 Typical input sensitivity

2