LMK6C datasheet(22/56 Pages) TI

22 / 56 page

9 Detailed Description

9.1 Overview

The LMK6x is a fixed-frequency BAW based oscillator that can provide ultra-low jitter for both differential and

single-ended output types.

9.2 Functional Block Diagram

VDD

CLK_P

GND

Power

Conditioning

CLK_N

OE / ST / NC

Temp

Sensor

Frequency Control

Logic

Output/Chip

Control Logic

BAW

Fractional

Output

Divider

Output

driver

9.3 Feature Description

9.3.1 Bulk Acoustic Wave (BAW)

TI’s BAW resonator technology uses piezoelectric transduction to generate high-Q resonance at 2.5 GHz. The

resonator is defined by the quadrilateral area overlaid by top and bottom electrodes. Alternating high- and

low-acoustic impedance layers form acoustic mirrors beneath the resonant body to prevent acoustic energy

leakage into the substrate. Furthermore, these acoustic mirrors are also placed on top of the resonator stack

to protect the device from contamination and minimize energy leakage into the package materials. This unique

dual-Bragg acoustic resonator (DBAR) allows efficient excitation without the need of costly vacuum cavities

around the resonator. As a result, TI’s BAW resonator is immune to frequency drift caused by adsorption of

surface contaminants and can be directly placed in a non-hermetic plastic package with the oscillator IC in small

standard oscillator footprints. Refer to BAW for more details on BAW technology.

9.3.2 Device Block-Level Description

The device contains a BAW oscillator, a Fractional Output Divider (FOD), and output driver, which together

generates a pre-programmed output frequency. Temperature variations of oscillation frequency are continuously

monitored by internal precision temperature sensor and provided as input to the frequency control logic block.

Using this frequency control logic block, frequency corrections are performed internally for maintaining the output

frequency within ±25 ppm across temperature range and aging. The output driver is capable of providing both

single-ended LVCMOS and differential LVPECL, LVDS, and HCSL output formats. The device contains an

internal LDO which reduces the power supply noise, resulting in low noise clock output.

9.3.3 Function Pin(s)

Pin 1 on the LMK6C and pin 1 or pin 2 on the LMK6P, LMK6D, and LMK6H are the function pins which have

multiple functions based on the orderable part number. The function can be used as Output Enable (OE), Stand

By (ST) or No Connect (NC). Options for both Active High and Active Low are available for OE and ST. Contact

TI for Active Low options. Table 9-1 lists the functions of pin 1 and pin 2 for differential output 6-pin packages

and Table 9-2 lists the functions of pin 1 for single-ended outputs.

LMK6C, LMK6D, LMK6H, LMK6P

SNAS826D – APRIL 2022 – REVISED FEBRUARY 2023

www.ti.com

Submit Document Feedback

Product Folder Links: LMK6C LMK6D LMK6H LMK6P

LMK6C датащи(PDF) 22 Page - Texas Instruments

LMK6C датащи(HTML) 22 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56

датащи скачать

ссылки URL