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LMX2314 Datasheet(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LMX2314
Description  1.2 GHz Frequency Synthesizer for RF Personal Communications
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMX2314 Datasheet(HTML) 2 Page - National Semiconductor (TI)

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Connection Diagrams
LMX2314
TLW11766 – 2
JEDEC 16-Lead (0150 Wide) Small
Outline Molded Package (M)
Order Number LMX2314M or LMX2314MX
See NS Package Number M16A
LMX2315
TLW11766 – 3
20-Lead (0173 Wide) Thin Shrink
Small Outline Package (TM)
Order Number LMX2315TM or LMX2315TMX
See NS Package Number MTC20
Pin Descriptions
Pin No
Pin No
Pin Name
IO
Description
2314
2315
23142315
1
1
OSCIN
I
Oscillator input A CMOS inverting gate input intended for connection to a crystal
resonator for operation as an oscillator The input has a VCC 2 input threshold and
can be driven from an external CMOS or TTL logic gate May also be used as a
buffer for an externally provided reference oscillator
2
3
OSCOUT
O
Oscillator output
34
VP
Power supply for charge pump Must be t VCC
45
VCC
Power supply voltage input Input may range from 27V to 55V Bypass capacitors
should be placed as close as possible to this pin and be connected directly to the
ground plane
56
Do
O
Internal charge pump output For connection to a loop filter for driving the input of
an external VCO
6
7
GND
Ground
7
8
LD
O
Lock detect Output provided to indicate when the VCO frequency is in ‘‘lock’’
When the loop is locked the pin’s output is HIGH with narrow low pulses
810
fIN
I
Prescaler input Small signal input from the VCO
9
11
CLOCK
I
High impedance CMOS Clock input Data is clocked in on the rising edge into the
various counters and registers
10
13
DATA
I
Binary serial data input Data entered MSB first LSB is control bit High impedance
CMOS input
11
14
LE
I
Load enable input (with internal pull-up resistor) When LE transitions HIGH data
stored in the shift registers is loaded into the appropriate latch (control bit
dependent) Clock must be low when LE toggles high or low See Serial Data Input
Timing Diagram
12
15
FC
I
Phase control select (with internal pull-up resistor) When FC is LOW the polarity of
the phase comparator and charge pump combination is reversed
X
16
BISW
O
Analog switch output When LE is HIGH the analog switch is ON routing the
internal charge pump output through BISW (as well as through Do)
13
17
fOUT
O
Monitor pin of phase comparator input CMOS output
14
18
wp
O
Output for external charge pump wp is an open drain N-channel transistor and
requires a pull-up resistor
15
19
PWDN
I
Power Down (with internal pull-up resistor)
PWDN e HIGH for normal operation
PWDN e LOW for power saving
Power down function is gated by the return of the charge pump to a TRI-STATE
condition
16
20
wr
O
Output for external charge pump wr is a CMOS logic output
X
2912
NC
No connect
2


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