TDA4VM21 datasheet(195/331 Pages) TI

195 / 331 page

For more information about Input clock interfaces, see Clocking section in Device Configuration chapter in the

device TRM.

6.9.4.1.1 WKUP_OSC0 Internal Oscillator Clock Source

Figure 6-23 shows the recommended crystal circuit. All discrete components used to implement the oscillator

circuit should be placed as close as possible to the WKUP_OSC0_XI and WKUP_OSC0_XO pins.

Device

WKUP_OSC0_XO

WKUP_OSC0_XI

Crystal

(Optional)

J7ES_WKUP_OSC_INT_02

Rbias

(Optional)

PCB Ground

Figure 6-23. WKUP_OSC0 Crystal Implementation

The crystal must be in the fundamental mode of operation and parallel resonant. Table 6-29 summarizes the

required electrical constraints.

Table 6-29. WKUP_OSC0 Crystal Electrical Characteristics

PARAMETER

MIN

TYP

MAX

UNIT

Fxtal

Crystal Parallel Resonance Frequency

19.2, 20, 24, 25, 26, 27

MHz

Fxtal

Crystal Frequency Stability and Tolerance

Ethernet RGMII and RMII

not used

±100

ppm

Ethernet RGMII and RMII

using derived clock

±50

CL1+PCBXI

Capacitance of CL1 + CPCBXI

CL2+PCBXO

Capacitance of CL2 + CPCBXO

Crystal Load Capacitance

Cshunt

Crystal Circuit Shunt Capacitance

ESRxtal = 30 Ω

19.2 MHz, 20 MHz,

24 MHz, 25 MHz, 26 MHz,

27 MHz

ESRxtal = 40 Ω

19.2 MHz, 20 MHz,

24 MHz, 25 MHz, 26 MHz,

27 MHz

ESRxtal = 50 Ω

19.2 MHz, 20 MHz,

24 MHz, 25 MHz, 26 MHz,

27 MHz

ESRxtal = 60 Ω

19.2 MHz, 20 MHz, 24 MHz

ESRxtal = 80 Ω

19.2 MHz, 20 MHz

25 MHz

ESRxtal = 100 Ω 19.2 MHz, 20 MHz

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TDA4VM-Q1, TDA4VM

SPRSP36K – SEPTEMBER 2021 – REVISED APRIL 2024

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