LMK6C datasheet(28/67 Pages) TI

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9.2.1 Design Requirements

The LMK6x is a fixed-frequency oscillator with no programming needed. Make sure to follow the recommended

termination options as described in the Clock Output Interfacing and Termination section closely. Refer to the

Function Pins section to understand the pin 1 and pin 2 functions, and order the part number as per the

requirements for Output Enable (OE), Standby (ST) options.

9.2.2 Detailed Design Procedure

The LMK6x has three different options for differential output which are LVDS, LVPECL, HCSL type and one

LVCMOS single-ended output type. For designing with the any of the oscillator output type in actual system, use

the proper AC or DC termination based on the application requirement. Refer to the Clock Output Interfacing

and Termination section for the details of all the AC and DC termination schemes and use the appropriate

option. The figures in this section have all the AC and DC coupling options with the termination resistor

values. The LMK6x has an integrated LDO and has excellent PSRR performance as shown in the Electrical

Characteristics table. Refer to the LMK6EVM for the reference layout recommendation while designing the

LMK6x BAW oscillator.

For the Function Pin 1 of LMK6C, connect typical 10kΩ or less resistor to VDD for driving the OE pin High.

Note this pin can be left open if using the pullup resistor is undesirable as the device has a greater than 100kΩ

internal pullup resistor. For driving the OE pin to Low, use the typical 10kΩ or less resistor as a pulldown resistor.

For the Function Pin 1 or Functional Pin 2 for LMK6D, LMK6H, LMK6P, you can use the similar approach

described for LMK6C.

9.2.3 Application Curves

The LMK6C LVCMOS output connects to different load capacitances based on the actual application use case

in a system. With the different load capacitance, the rise time / fall time varies for the specific output frequency.

The following graphs shows the Rise / Fall time for load capacitance of 2.2pF, 4.7pF, 10pF, 15pF and 22pF for

temperature range from –40°C to 105°C.

Temperature (oC)

-40

-20

100

300

600

900

1200

1500

1800

2100

2400

2700

3000

0 pF

2.2 pF

4.7 pF

10 pF

15 pF

22 pF

Figure 9-2. Rise / Fall time (ps) vs Temperature for 25MHz Output Frequency, 3.3V Supply

LMK6C, LMK6D, LMK6H, LMK6P

SNAS826E – APRIL 2022 – REVISED APRIL 2024

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