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PDF ( 数据手册 , 数据表 ) NJ88C33

零件编号 NJ88C33
描述 Frequency Synthesiser
制造商 Zarlink Semiconductor
LOGO Zarlink Semiconductor LOGO 


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NJ88C33 数据手册, 描述, 功能
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NJ88C33
Frequency Synthesiser (I2C BUS Programmable)
Advance Information
DS2429 - 3.2 September 1994
The NJ88C33 is a synthesiser circuit fabricated on Zarlink
Semiconductor's 1.4 micron CMOS process, assuring very
high performance. It is I2C 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 Easy to Use
s Low Power Consumption (15mW)
s Single Supply 2.5V to 5.5V
s Digital Phase Comparator with Current Source
Outputs
s Serial (I2C Compatible) Programming, 5MHz max
s Channel Loading in 8µs
s 150MHz Input Frequency Without Prescaler at 4.5V
(52MHz at 2.7V)
s Standby Modes
s Use of Two-Modulus Prescaler is Possible
APPLICATIONS
s Cordless Telephones (CT2, DECT)
s Cellular Telephones (GSM, PCN, ETACS)
s Hand Held Marine Radios
s Sonarbuoys
s Video Clock generators
MP14
Fig.1 Pin connections (not to scale) - top views
ABSOLUTE MAXIMUM RATINGS
Supply voltage, VDD
Input voltage, VIM1
Output voltage on pin 13, VIM2
Storage temperature, Tstg
-0.3V to 7V
-0.3 to VDD +0.3V
-VDD to 0V
-55°C to +125°C
ORDERING INFORMATION
NJ88C33 MA DP (Industrial - Plastic DIL package)
NJ88C33 MA MP (Industrial - Miniature Plastic DIL package)
Fig.2 Simplified block diagram of NJ88C33







NJ88C33 pdf, 数据表
NJ88C33
APPLICATION CIRCUITS
Single Modulus
In this mode, the NJ88C33 synthesiser can be used with
or without a fixed modulus prescaler. The R counter is
programmed with a value to produce a comparison frequency
fc. When the N counter is changed by 1 the loop is no longer
in lock and the phase detector output produces current pulses
to bring the loop back into lock. These pulses are integrated by
the loop fiiter to produce the VCO voltage drive. When the
VCO loop is locked, Fl/N=fC i.e., the VCO frequency is N x fC.
Using a prescaler with a division ratio P, the smallest VCO
output frequency step is Pf and the VCO frequency is PNf .
CC
If a low pass filter is connected to the lock detect output as
shown and sampled by the microprocessor, the proximity of
the synthesiser loop to lock can be evaluated.
The A counter is not used in this mode.
Fig. 7 Single modulus application
Dual Modulus
This mode allows much higher frequencies to be used in
conjunction with a prescaler but maintains the step size, fc. In
this mode, a dual modulus prescaler (with ratios P and P + 1)
must be used with the NJ88C33. The A counter controls the
MOD output, which is used to select the division ratio of the
prescaler.
When the A counter is non-zero, the MOD output is low and
goes high when the A counter has counted down to zero.
MOD remains high until the N counter reaches zero, when
both counters are re-loaded. Thus, the prescaler divides by P
for N-A cycles and by P + 1 for A cycles of Fl. The VCO
frequency is given by PNfC + AfC.
Note that programming A = 0 produces a count of 128 cycles.
Fig. 8 Dual modulus application
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