LMK04832PAPSLASHEM datasheet(86/103 Pages) TI

86 / 103 page

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

9.1.3.2 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.

Note

The signal level must conform to the requirements for the CLKin or OSCin pins listed in the Electrical

Characteristics table.

To support LOS functionality, CLKinX_BUF_TYPE must be set to MOS mode (CLKinX_BUF_TYPE

= 1) when AC-coupled. When AC coupling, if the 100-Ω termination is placed on the IC side of the

blocking capacitors, then the LOS functionality will not be valid.

Clock Source

Input

0.1 µF

0.1 µ F

CLKINx_P

CLKINx_N

Figure 9-4. CLKINx_P/CLKINx_N Single-Ended Termination

If the CLKin pins are being driven with a single-ended LVCMOS/LVTTL source, either DC coupling or

AC coupling may be used. If DC coupling is used, the CLKinX_BUF_TYPE should be set to MOS buffer

mode (CLKinX_BUF_TYPE = 1) and the voltage swing of the source must meet the specifications for DC-

coupled, MOS-mode clock inputs given in the Electrical Characteristics table. If AC coupling is used, the

CLKinX_BUF_TYPE should be set to the bipolar buffer mode (CLKinX_BUF_TYPE = 0). The voltage swing at

the input pins must meet the specifications for AC-coupled, bipolar mode clock inputs given in the Electrical

Characteristics table. In this case, some attenuation of the clock input level may be required. A simple resistive

divider circuit before the AC-coupling capacitor is sufficient.

LMK04832-SEP

SNAS838 – OCTOBER 2022

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