LMX2571_15 datasheet(3/61 Pages) TI

Part #	LMX2571

Description	LMX2571 Low-Power, High-Performance PLLatinum??RF Synthesizer with FSKModulation

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Manufacturer	TI [Texas Instruments]

Direct Link	http://www.ti.com

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1

2

3

4

5

6

7

8

9

27

26

25

24

23

22

21

20

19

0

DAP

Vcc3p3

NC

CPout

Fin

GND

VrefVCO

VregVCO

Vcc3p3

CE

Vcc3p3

Bypass1

Bypass2

FSK_DV

FSK_D2

FSK_D1

FSK_D0

NC

Vcc3p3

LMX2571

www.ti.com

SNAS654 – MARCH 2015

5 Pin Configuration and Functions

WQFN (NJK) Package

36 Pins

Top View

Pin Functions

TYPE

DESCRIPTION

NAME

NO.

Bypass1

2

Bypass

Place a 100-nF capacitor to GND.

Bypass2

3

Bypass

Place a 100-nF capacitor to GND.

CE

19

Input

Chip Enable input. Active HIGH powers on the device.

CLK

11

Input

MICROWIRE clock input.

CPout

25

Output

Internal VCO charge pump access point to connect to a 2nd order loop filter.

CPoutExt

30

Output

5-V charge pump output used in PLL mode (external VCO).

DAP

0

GND

The DAP should be grounded.

DATA

12

Input

MICROWIRE serial data input.

High frequency AC coupled input pin for an external VCO. Leave it open or AC coupled to GND if not

Fin

24

Input

being used.

FSK_D0

7

Input

FSK data bit 0 (FSK PIN mode) / I2S FS input (FSK I2S mode).

FSK_D1

6

Input

FSK data bit 1 (FSK PIN mode) / I2S DATA input (FSK I2S mode).

FSK_D2

5

Input

FSK data bit 2 (FSK PIN mode).

FSK_DV

4

Input

FSK data valid input (FSK PIN mode) / I2S CLK input (FSK I2S mode).

FLout1

29

Output

FastLock output control 1 for external switch. Output is HIGH when F1 is selected.

FLout2

28

Output

FastLock output control 2 for external switch. Output is HIGH when F2 is selected.

GND

23

GND

VCO ground.

GND

31

GND

Charge pump ground.

GND

35

GND

OSCin ground.

LE

13

Input

MICROWIRE latch enable input.

MUXout

10

Output

Multiplexed output that can be assigned to lock detect or readback serial data output.

NC

8,14, 26

NC

Do not connect these pins.

OSCin

34

Input

Reference clock input.

OSCin*

36

Input

Complementary reference clock input.

RFoutRx

16

Output

RF output used to drive receive mixer. Selectable open drain or push-pull output.

RFoutTx

17

Output

RF output used to drive transmit signal. Selectable open drain or push-pull output.

TrCtl

18

Input

Transmit/Receive control. This pin controls the RF output port and the output frequency selection.

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