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LMX2370 Datasheet(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LMX2370
Description  PLLatinum™ Dual Frequency Synthesizer for RF Personal Communications
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LMX2370 Datasheet(HTML) 2 Page - National Semiconductor (TI)

 
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Connection Diagrams
Pin Descriptions
Pin No.
Pin
Name
I/O
Description
24-Pin
CSP
20-Pin
TSSOP
24
1
V
CC1
Power supply voltage input for RF analog and RF digital circuits. Input may range
from 2.7V to 5.5V. V
CC1 must equal VCC2. Bypass capacitors should be placed as
close as possible to this pin and be connected directly to the ground plane.
2
2
Vp1
Power supply for Main charge pump. Must be
≥ V
CC.
33
CP
o1
O
Internal Main charge pump output. For connection to a loop filter for driving the
input of an external VCO.
4
4
GND
Ground for Main digital circuitry.
55
f
IN1
I
Main prescaler input. Small signal input from the VCO.
66
f
IN1b
I
Main prescaler complementary input. For single ended operation, a bypass
capacitor should be placed as close as possible to this pin and be connected
directly to the ground plane.
7
7
GND
Ground for Main analog circuitry.
8
8
OSC
in
I
Oscillator input. The input has a V
CC/2 input threshold and can be driven from an
external CMOS or TTL logic gate.
10
9
GND
Ground for Aux digital, MICROWIRE, FoLD, and oscillator circuits.
11
10
Fo/LD
O
Multiplexed output of the Main/Aux programmable or reference dividers,
Main/Auxiliary lock detect signals and Fastlock mode. CMOS output
(see
Programmable Modes in the Datasheet).
12
11
Clock
I
High impedance CMOS Clock input. Data for the various counters is clocked in on
the rising edge, into the 22-bit shift register.
14
12
Data
I
Binary serial data input. Data entered MSB first. The last two bits are the control
bits. High impedance CMOS input.
15
13
LE
I
Load enable. High impedance CMOS input. When LE goes HIGH, data stored in
the shift registers is loaded into one of the 4 appropriate latches (control bit
dependent).
TSSOP 20-Pin Package
DS101026-2
Top View
Order Number LMX2370TM, LMX2370TMX,
LMX2371TM, LMX2371TMX,
LMX2372TM or LMX2372TMX
See NS Package Number MTC20
CSP 24-Pin Package
DS101026-3
Top View
Order Number LMX2370SLBX,
LMX2371SLBX or LMX2372SLBX
See NS Package Number SLB24A
www.national.com
2


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