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LMX2310U Datasheet(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LMX2310U
Description  PLLatinum™ Ultra Low Power Frequency Synthesizer for RF Personal Communications
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LMX2310U Datasheet(HTML) 3 Page - National Semiconductor (TI)

 
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Pin Descriptions
Pin Number
Pin Name
I/O
Description
I/O Circuit Configuration
1
NC
— No Connect.
2CP
o
O Charge Pump output. For connection to a
loop filter for driving the voltage control
input of an external VCO.
3
GND
— Analog ground.
4F
IN
I
RF prescaler input. Small signal input
from the VCO.
5F
INB
I
RF prescaler complementary input. For
single ended operation, this pin should be
AC grounded. The LMX2310/1/2/3U can
be driven differentially when a bypass
capacitor is omitted.
6
OSC
IN
I
Oscillator input. An input to a CMOS low
noise inverting buffer. The input can be
driven from an external CMOS or TTL
logic gate.
7
NC
— No Connect.
8
OSC
OUT
O
Oscillator output. The OSC
IN low noise
buffer drives an independent oscillator
buffer. Its output is connected to the
OSC
OUT pin. It can be used as a buffer to
provide the reference oscillator frequency
to other circuitry or as a crystal oscillator.
9
FoLD
O
Multi-function CMOS output pin that
provides multiplexed access to digital lock
detect, open drain analog lock detect, as
well as the outputs of the R and N
counters. The FoLD pin is internally
referenced to V
µC.
10
Clock
I
High impedance CMOS Clock input. Data
for the counters is clocked in on the rising
edge, into the 22-bit shift register. The
Clock is internally referenced to V
µC.
www.national.com
3


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