AM3359 datasheet(107/256 Pages) TI1

107 / 256 page

AM335x

XTALIN

VSS_OSC

XTALOUT

Optional R

Crystal

Optional R

bias

107

AM3359, AM3358, AM3357, AM3356, AM3354, AM3352, AM3351

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SPRS717L – OCTOBER 2011 – REVISED MARCH 2020

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Power and Clocking

Oscillator components (Crystal, C1, C2, optional Rbias and Rd) must be located close to the AM335x package.

Parasitic capacitance to the VSS_OSC and respective crystal circuit component grounds should be connected directly

to the nearest PCB digital ground (VSS).

C1 and C2 represent the total capacitance of the respective PCB trace, load capacitor, and other components

(excluding the crystal) connected to each crystal terminal. The value of capacitors C1 and C2 should be selected to

provide the total load capacitance, CL, specified by the crystal manufacturer. The total load capacitance is CL = [(C1 ×

C2) / (C1 + C2)] + Cshunt, where Cshunt is the crystal shunt capacitance (C0) specified by the crystal manufacturer plus

any mutual capacitance (Cpkg + CPCB) seen across the AM335x XTALIN and XTALOUT signals. For recommended

values of crystal circuit components, see Table 6-2.

Figure 6-9. OSC0 Crystal Circuit Schematic

(1)

Initial accuracy, temperature drift, and aging effects should be combined when evaluating a reference clock for this requirement.

Table 6-2. OSC0 Crystal Circuit Requirements

PARAMETER

MIN

TYP

MAX

UNIT

ƒxtal

Crystal parallel resonance

frequency

Fundamental mode oscillation only

19.2, 24,

25, or 26

MHz

Crystal frequency stability

and tolerance(1)

–50

ppm

CC1

C1 capacitance

Cshunt ≤ 5 pF

Cshunt > 5 pF

CC2

C2 capacitance

Cshunt ≤ 5 pF

Cshunt > 5 pF

Cshunt

Shunt capacitance

ESR

Crystal effective series

resistance

ƒxtal = 19.2 MHz, oscillator has nominal

negative resistance of 272 Ω and worst-

case negative resistance of 163 Ω

54.4

ƒxtal = 24 MHz, oscillator has nominal

negative resistance of 240 Ω and worst-

case negative resistance of 144 Ω

48.0

ƒxtal = 25 MHz, oscillator has nominal

negative resistance of 233 Ω and worst-

case negative resistance of 140 Ω

46.6

ƒxtal = 26 MHz, oscillator has nominal

negative resistance of 227 Ω and worst-

case negative resistance of 137 Ω

45.3

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