MITEL SP8401 Datasheet

SP8401

Very Low Phase Noise 300MHz ÷10/11

Supersedes February 1992 edition DS3230 - 3.1 April 1994

The SP8401 is a very low phase noise variable modulus
divider. Special circuit techniques have been used to reduce
the phase noise considerably below that produced by standard
dividers. The modulus control input is CMOS or TTL
compatible.

The SP8401 is packaged in a 28 pin plastic SO package to
be compatible with the SP8400 and SP8402 devices.

FEATURES

■ Very low Phase Noise (Typically -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

N/C
N/C
N/C

V

+5V

CC

GND

INPUT

CLOCK
CLOCK INPUT
CLOCK INPUT

INPUT

CLOCK

GND

V

+5V

CC

V

+5V

CC

N/C

MODULUS CONTROL

1
2
3
4
5
6
7
8

9
10
11
12
13
14 15

28

N/C

27

N/C

26

N/C

25

N/C

24

N/C

23

N/C

22

N/C

21

OUTPUT

20

OUTPUT

19

N/C

18

V

+5V
17
16

CC

N/C
N/C
N/C

MP28

ORDERING INFORMATION

SP8401 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

1 10 100 1k 10k 100k

Fig.1 Pin connections - top view

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 50MHz to 300MHz

Modulus Control Inputs

Logic high voltage
Low low voltage
Input current
Set up time t
Release time t

s

r

400

300

RMS

mV

200

IN

V

100

Pin

4, 11, 12, 18

20, 21

7, 8

14
14
14
14
14

Value

Min. Typ. Max.

57

50

340

440

64

140
(-4)

2.2

0.8

180
4
4

OPERATING WINDOW

Units

mA
mV

mV

dBm

V

µA

ns
ns

Conditions

Output loaded with 300R See Fig.5
p-p @ 330MHz input ÷ 11 mode
Output loaded with 300R
RMS Sine wave into 50 Ohms
(dBm equivalent) See Fig.3

÷ 10 mode
÷ 11 mode

Modulus control input voltage 5V

355mV

140mV

0 50 100 150 200 250 300 350

INPUT FREQUENCY (MHz)

Fig.3 Typical input sensitivity

CLOCK INPUT

MODULUS
CONTROL
INPUT

OUTPUT

r

t

65

t

s

5

Fig.4 Timing diagram

2