Connection Diagrams

Pin Descriptions

16-Pin

TSSOP

16-Pin

CSP

Pin

Name

I/O

Description

115

FL

o

O

FastLock Output. For connection of parallel resistor to the loop filter. (See Section 1.3.4

FASTLOCK MODES description.)

216

CP

o

O

Charge Pump Output. For connection to a loop filter for driving the input of an external VCO.

3

1

GND

Charge Pump Ground.

4

2

GND

Analog Ground.

53

f

IN

I

RF Prescaler Complementary Input. A bypass capacitor should be placed as close as possible to

this pin and be connected directly to the ground plane. The complementary input can be left

unbypassed, with some degradation in RF sensitivity.

64

f

IN

I

RF Prescaler Input. Small signal input from the VCO.

75

V

CC1

Analog Power Supply Voltage Input. Input may range from 2.3V to 5.5V. Bypass capacitors should

be placed as close as possible to this pin and be connected directly to the ground plane. V

CC1

must equal V

8

6

OSC

IN

I

Oscillator Input. This input is a CMOS input with a threshold of approximately V

equivalent 100k input resistance. The oscillator input is driven from a reference oscillator.

9

7

GND

Digital Ground.

10

8

CE

I

Chip Enable. A LOW on CE powers down the device and will TRI-STATE the charge pump output.

Taking CE HIGH will power up the device depending on the status of the power down bit F2. (See

Section 1.3.1 POWERDOWN OPERATION and Section 1.7.1 DEVICE PROGRAMMING AFTER

FIRST APPLYING V

11

9

Clock

I

High Impedance CMOS Clock Input. Data for the various counters is clocked in on the rising edge

into the 21-bit shift register.

12

10

Data

I

Binary Serial Data Input. Data entered MSB first. The last two bits are the control bits. High

impedance CMOS input.

13

11

LE

I

Load Enable CMOS Input. When LE goes HIGH, data stored in the shift registers is loaded into one

of the 3 appropriate latches (control bit dependent).

14

12

Fo/LD

O

Multiplexed Output of the RF Programmable or Reference Dividers and Lock Detect. CMOS output.

(See

Table 4.)

15

13

V

CC2

Digital Power Supply Voltage Input. Input may range from 2.3V to 5.5V. Bypass capacitors should

be placed as close as possible to this pin and be connected directly to the ground plane. V

CC1

must equal V

16

14

V

P

Power Supply for Charge Pump. Must be

≥ V

LMX2306/16/26

DS100127-2

16-Lead (0.173” Wide) Thin Shrink Small Outline

Package(TM)

Order Number LMX2306TM, LMX2306TMX,

LMX2316TM, LMX2316TMX,

LMX2326TM or LMX2326TMX

See NS Package Number MTC16

LMX2306/16/26

DS100127-19

16-pin Chip Scale Package

Order Number LMX2306SLBX, LMX2316SLBX or

LM2326SLBX

See NS Package Number SLB16A

www.national.com

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