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
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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 8µs
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°C to +125°C
APPLICATIONS
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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
MITEL [ MITEL NETWORKS CORPORATION ]
