AM652X datasheet(144/299 Pages) TI1

144 / 299 page

CL=

C C

(C +C )

SPRS932_CLOCK_03

Device

OSC1_XO

OSC1_XI

Crystal

(Optional)

SPRSP08_PCB_CLK_OSC_1

Rbias

(Optional)

PCB Ground

144

AM6548, AM6528, AM6546

AM6526, AM6527

SPRSP08E – NOVEMBER 2017 – REVISED OCTOBER 2018

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Specifications

5.11.4.1.3 Auxiliary OSC1 Internal Oscillator Clock Source

Figure 5-15 shows the recommended crystal circuit. It is recommended that preproduction printed-circuit

board (PCB) designs include the two optional resistors Rbias and Rd in case they are required for proper

oscillator operation when combined with production crystal circuit components. In most cases, Rbias is not

required and Rd is a 0-Ω resistor. These resistors may be removed from production PCB designs after

evaluating oscillator performance with production crystal circuit components installed on preproduction

PCBs.

Figure 5-15. OSC1 Crystal Implementation

NOTE

The load capacitors, Cf1 and Cf2 in Figure 5-16, should be chosen such that the below

equation is satisfied. CL in the equation is the load specified by the crystal manufacturer. All

discrete components used to implement the oscillator circuit should be placed as close as

possible to the associated oscillator OSC1_XI, OSC1_XO, and VSS pins.

Figure 5-16. Load Capacitance Equation

The crystal must be in the fundamental mode of operation and parallel resonant. Table 5-20 summarizes

the required electrical constraints.

Table 5-20. OSC1 Crystal Electrical Characteristics

NAME

DESCRIPTION

MIN

TYP

MAX

UNIT

Parallel resonance crystal frequency

19.2, 20, 24, 25, 26, 27

MHz

Cf1

Cf1 load capacitance for crystal parallel resonance with Cf1 = Cf2

Cf2

Cf2 load capacitance for crystal parallel resonance with Cf1 = Cf2

ESR(Cf1,Cf2)

Crystal ESR

100

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