LMX2370 National Semiconductor, LMX2370 Datasheet - Page 2

• Manufacturer Part Number: LMX2370
• Description: PLLatinum Dual Frequency Synthesizer for RF Personal Communications
• Manufacturer: National Semiconductor

www.national.com
24-Pin
Connection Diagrams
Pin Descriptions
CSP
24
10
11
12
14
15
2
3
4
5
6
7
8
Pin No.
Order Number LMX2370TM, LMX2370TMX,
TSSOP
20-Pin
See NS Package Number MTC20
10
11
12
13
LMX2372TM or LMX2372TMX
1
2
3
4
5
6
7
8
9
LMX2371TM, LMX2371TMX,
TSSOP 20-Pin Package
Name
OSC
Fo/LD
Clock
V
CP
Top View
GND
f
GND
GND
Data
Vp1
Pin
f
IN
LE
CC
IN
1b
o
1
1
1
in
I/O
—
—
—
—
—
O
O
I
I
I
I
I
I
DS101026-2
Power supply voltage input for RF analog and RF digital circuits. Input may range
from 2.7V to 5.5V. V
close as possible to this pin and be connected directly to the ground plane.
Power supply for Main charge pump. Must be
Internal Main charge pump output. For connection to a loop filter for driving the
input of an external VCO.
Ground for Main digital circuitry.
Main prescaler input. Small signal input from the VCO.
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.
Ground for Main analog circuitry.
Oscillator input. The input has a V
external CMOS or TTL logic gate.
Ground for Aux digital, MICROWIRE, FoLD, and oscillator circuits.
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).
High impedance CMOS Clock input. Data for the various counters is clocked in on
the rising edge, into the 22-bit shift register.
Binary serial data input. Data entered MSB first. The last two bits are the control
bits. High impedance CMOS input.
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).
2
CC
1 must equal V
CC
See NS Package Number SLB24A
LMX2371SLBX or LMX2372SLBX
Description
Order Number LMX2370SLBX,
/2 input threshold and can be driven from an
CC
2. Bypass capacitors should be placed as
CSP 24-Pin Package
Top View
V
CC
.
DS101026-3