LMX2430TM datasheet(3/53 Pages) TI1

tên linh kiện	LMX2430TM

Giải thích chi tiết về linh kiện	Dual High-Frequency Synthesizer

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LMX2430, LMX2433, LMX2434

www.ti.com

SNAS187D – FEBRUARY 2003 – REVISED JANUARY 2016

5 Description continued

The LMX243x devices are high-performance frequency synthesizers with integrated dual-modulus prescalers. A

32/33 or a 16/17 prescale ratio can be selected for the 5-GHz LMX2434 RF synthesizer. An 8/9 or a 16/17

prescale ratio can be selected for both the LMX2430 and LMX2433 RF synthesizers. The IF circuitry contains an

8/9 or a 16/17 prescaler.

Serial data is transferred to the devices through a three-wire interface (DATA, LE, CLK). A low voltage logic

interface allows direct connection to 1.8-V devices. Supply voltages from 2.25 V to 2.75 V are supported.

6 Pin Configuration and Functions

NPE Package

PW Package

20-Pin ULGA Ultra Thin Chip Scale

20-Pin TSSOP Thin Shrink Small Outline

Top View

Pin Functions

I/O

DESCRIPTION

NAME

ULGA

TSSOP

MICROWIRE Clock input. High-impedance CMOS input. DATA is clocked into the

CLK

18

19

I

24-bit shift register on the rising edge of CLK.

IF PLL charge-pump output. The output is connected to the external loop filter,

CPoutIF

4

5

O

which drives the input of the IF VCO.

RF PLL charge-pump output. The output is connected to the external loop filter,

CPoutRF

12

13

O

which drives the input of the RF VCO.

MICROWIRE Data input. High-impedance CMOS input. Binary serial data. The MSB

DATA

19

20

I

of DATA is shifted in first. The two last bits are the control bits.

Chip Enable input. High-Impedance CMOS input. When this pin is set HIGH, the RF

and IF PLLs are powered up. Power down is then controlled through the

EN

3

4

I

MICROWIRE. When this pin is set LOW, the device is asynchronously powered

down, and the charge-pump output is forced to a high-impedance state (tri-state).

Oscillator Enable input. High-impedance CMOS input. When this pin is set HIGH,

the oscillator buffer is always powered up, independent of the state of the EN pin.

ENosc

5

6

I

When this pin is set LOW, the OSCout/ FLoutIF pin functions as an IF fastlock

output, which connects a resistor in parallel to R2 of the external loop filter.

FinIF

2

3

I

IF PLL prescaler input. Small signal input from the VCO.

RF PLL fastlock output. This pin connects a resistor in parallel to R2 of the external

FLoutRF

10

11

O

loop filter. This pin can also function as a general-purpose CMOS tri-state output.

FinRF

14

15

I

RF PLL prescaler input. Small-signal input from the VCO.

RF PLL prescaler complementary input. For single-ended operation, this pin must be

FinRF*

15

16

I

AC grounded through a 100-pF capacitor. The LMX243x can be driven differentially

when the AC-coupled capacitor is omitted.

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Product Folder Links: LMX2430 LMX2433 LMX2434

Số phần tương tự - LMX2430TM

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National Semiconductor ...	LMX2430TMX	943Kb / 49P	PLLatinum Dual High Frequency Synthesizer for RF Personal Communications

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Mô tả tương tự - LMX2430TM

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