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NJ88C33

Frequency Synthesiser (I

2

C BUS Programmable)

Advance Information

DS2429 - 3.2 September 1994

The NJ88C33 is a synthesiser circuit fabricated on Mitel

Semiconductor's 1.4 micron CMOS process, assuring very

high performance. It is I

2

C compatible and can also be

programmed at up to 5MHz. It contains a 16-bit R counter, a

12-bit N counter and a 7-bit A counter.

A digital phase comparator gives improved loop stability

with current source outputs to reduce loop components. A

voltage doubler is provided for the loop driver to improve

control voltage range to the VCO when operating at low supply

voltages.

DP14

FEATURES

s

s

s

s

s

s

s

s

s

Easy to Use

Low Power Consumption (15mW)

Single Supply 2.5V to 5.5V

Digital Phase Comparator with Current Source

Outputs

Serial (I

2

C Compatible) Programming, 5MHz max

Channel Loading in 8碌s

150MHz Input Frequency Without Prescaler at 4.5V

(52MHz at 2.7V)

Standby Modes

Use of Two-Modulus Prescaler is Possible

MP14

Fig.1 Pin connections (not to scale) - top views

ABSOLUTE MAXIMUM RATINGS

Supply voltage, V

DD

Input voltage, V

IM1

Output voltage on pin 13, V

IM2

Storage temperature, T

stg

-0.3V to 7V

-0.3 to V

DD

+0.3V

-V

DD

to 0V

-55擄C to +125擄C

APPLICATIONS

s

s

s

s

s

Cordless Telephones (CT2, DECT)

Cellular Telephones (GSM, PCN, ETACS)

Hand Held Marine Radios

Sonarbuoys

Video Clock generators

ORDERING INFORMATION

NJ88C33 MA DP

(Industrial - Plastic DIL package)

NJ88C33 MA MP

(Industrial - Miniature Plastic DIL package)

Fig.2 Simplified block diagram of NJ88C33

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