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LMX1601 Datasheet(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LMX1601
Description  PLLatinum??Low Cost Dual Frequency Synthesizer
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMX1601 Datasheet(HTML) 2 Page - National Semiconductor (TI)

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Connection Diagram
Pin Description
Pin
No.
Pin Name
I/O
Description
1
FoLD
O
Multiplexed output of the Main/Aux programmable or reference dividers and Main/Aux lock
detect. CMOS output. (See Programming Description 2.5)
2
OSC
IN
I
PLL reference input which drives both the Main and Aux R counter inputs. Has about 1.2V
input threshold and can be driven from an external CMOS or TTL logic gate. Typically
connected to a TCXO output. Can be used with an external resonator (See Programming
Description 2.5.4).
3
OSC
OUT
O
Oscillator output. Used with an external resonator.
4
GND
Aux PLL ground.
5
fin
AUX
I
Aux prescaler input. Small signal input from the VCO.
6V
CCAUX
Aux PLL power supply voltage input. Must be equal to V
CCMAIN. May range from 2.7V to
3.6V. Bypass capacitors should be placed as close as possible to this pin and be
connected directly to the ground plane.
7
CPo
AUX
O
Aux PLL Charge Pump output. Connected to a loop filter for driving the control input of an
external VCO.
8EN
AUX
I
Powers down the Aux PLL when LOW (N and R counters, prescaler, and tristates charge
pump output). Bringing EN
AUX HIGH powers up the Aux PLL.
9EN
MAIN
I
Powers down the Main PLL when LOW (N and R counters, prescaler, and tristates charge
pump output). Bringing EN
MAIN HIGH powers up the Main PLL.
10
CPo
MAIN
O
Main PLL Charge Pump output. Connected to a loop filter for driving the control input of an
external VCO.
11
V
CCMAIN
Main PLL power supply voltage input. Must be equal to V
CCAUX. May range from 2.7V to
3.6V. Bypass capacitors should be placed as close as possible to this pin and be
connected directly to the ground plane.
12
fin
MAIN
I
Main prescaler input. Small signal input from the VCO.
13
GND
Main PLL ground.
14
LE
I
Load enable high impedance CMOS input. Data stored in the shift registers is loaded into
one of the 4 internal latches when LE goes HIGH (control bit dependent).
15
Data
I
High impedance CMOS input. Binary serial data input. Data entered MSB first. The last two
bits are the control bits.
16
Clock
I
High impedance CMOS Clock input. Data for the various counters is clocked in on the
rising edge, into the 18-bit shift register.
DS100129-2
Order Number LMX1600TM, LMX1601TM, or LMX1602TM
NS Package Number MTC16
www.national.com
2


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