AM652X datasheet(153/277 Pages) TI1

153 / 277 page

VSS

Device

OSC1_XO

OSC1_XI

SPRSP08_CLK_01

PCB Ground

VDDS_OSC1

OSC1_XO

Time

VSS

VDDS_OSC1 (min.)

VDD_CORE (min.)

VSS

VDD_CORE

153

AM6548, AM6528, AM6546

AM6526, AM6527

www.ti.com

SPRSP08I – NOVEMBER 2017 – REVISED DECEMBER 2019

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Product Folder Links: AM6548 AM6528 AM6546 AM6526 AM6527

Specifications

(1) In order to meet the start-up time defined in this table, the crystal needs to be selected according to the following equation:

Tsu = K×Lm/ (Ro-ESR) + Δt

where Lm is crystal motional inductance, RO is the negative resistance of amplifier, ESR is the crystal Effective series resistance and K

is a constant which represents the initial conditions. Δt is the time amplifier takes to reach its bias point after power down is released.

Figure 5-17. OSC1 Start-up Time

5.9.4.1.4 Auxiliary OSC1 LVCMOS Digital Clock Source

Figure 5-18 shows the recommended oscillator connections when OSC1 is connected to an LVCMOS

square-wave digital clock source The 1.8-V LVCMOS-Compatible clock source is connected to the

OSC1_XI pin. In this mode of operation, the OSC1_XO pin is left unconnected and should not be used to

source any external components.

Figure 5-18. 1.8-V LVCMOS-Compatible Clock Input

Table 5-26 summarizes the OSC1 input clock electrical characteristics.

Table 5-26. OSC1 Switching Characteristics – Crystal Mode

NAME

DESCRIPTION

MIN

TYP

MAX

UNIT

Frequency

19.2, 20, 24, 25, 26, 27

MHz

CIN

Input capacitance

2.184

2.384

2.584

IIN

Input current (3.3V mode)

µA

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