LMK04832PAPSLASHEM datasheet(86/102 Pages) TI

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9.1.4 Driving CLKIN AND OSCIN Inputs

9.1.4.1 Driving CLKIN and OSCIN PINS With a Differential Source

CLKin and OSCin pins can be driven by differential signals. TI recommends setting the input mode to bipolar

(CLKinX_BUF_TYPE = 0) when using differential reference clocks. The device internally biases the input pins so

the differential interface should be AC-coupled. The recommended circuits for driving the CLKin pins with either

LVDS or LVPECL are shown in Figure 9-1 and Figure 9-2.

LVDS

Output

Input

100

Trace

(Di eren al)

0.1 µF

CLKINx_P

CLKINx_N

Figure 9-1. CLKINx_P/CLKINx_N or OSCIN Termination for an LVDS Reference Clock Source

LVPECL

Output

Input

100

Trace

(Di eren al)

0.1 µF

CLKINx_P

CLKINx_N

Figure 9-2. CLKINx_P/CLKINx_N or OSCIN Termination for an LVPECL Reference Clock Source

Finally, a reference clock source that produces a differential sine wave output can drive the CLKIN pins using

the following circuit. Note: the signal level must conform to the requirements for the CLKIN pins listed in the

Electrical Characteristics table.

Di eren al

Sinewave Clock

Input

100

Trace

(Di eren al)

0.1 µF

0.1 µ F

CLKINx_P

CLKINx_N

Figure 9-3. CLKINx_P/CLKINx_N or OSCIN Termination for a Differential Sinewave Reference Clock

Source

9.1.4.2 Driving CLKIN Pins With a Single-Ended Source

The CLKIN and OSCIN pins can be driven using a single-ended reference clock source, for example, either a

sine wave source or an LVCMOS/LVTTL source. CLKIN supports both AC coupling or DC coupling. OSCin must

use AC coupling. In the case of the sine wave source that is expecting a 50-Ω load, TI recommends using AC

coupling as shown in Figure 9-4 with a 50-Ω termination.

LMK04832-SEP

SNAS838A – OCTOBER 2022 – REVISED NOVEMBER 2022

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