LMX2370 National Semiconductor, LMX2370 Datasheet - Page 3

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

24-Pin
13, 21
Pin Descriptions
Block Diagram
CSP
1, 9,
16
17
18
19
20
22
23
Pin No.
TSSOP
20-Pin
14
15
16
17
18
19
20
—
Name
CP
V
GND
GND
Vp2
Vµc
f
Pin
NC
IN
CC
o
2
2
2
(Continued)
I/O
—
—
—
—
—
—
O
I
Power supply for MICROWIRE circuitry. Must be
same supply level as µprocessor or baseband controller to enable programming at
low voltages.
Ground for Aux analog circuitry.
Auxiliary prescaler input. Small signal input from the VCO.
Ground for Aux digital, MICROWIRE, FoLD, and oscillator.
Aux internal charge pump output. For connection to a loop filter for driving the
input of an external VCO.
Power supply for Aux charge pump. Must be
Power supply voltage input for Aux analog, Aux digital, FoLD, and oscillator
circuits. Input may range from 2.7V to 5.5V. V
capacitors should be placed as close as possible to this pin and be connected
directly to the ground plane.
No Connect
3
Description
CC
V
2 must equal V
CC
V
.
CC
. Typically connected to
CC
1. Bypass
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