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ZHCSHS2C may 2017 – january 2022 AWR1443

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ABL|161

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8.9.3.1 Clock Specifications

An external crystal is connected to the device pins. Figure 8-4 shows the crystal implementation.

Figure 8-4 Crystal Implementation

Note:

The load capacitors, C_f1 and C_f2 in Figure 8-4, should be chosen such that Equation 1 is satisfied. C_L 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 CLKP and CLKM pins.Note that Cf1 and Cf2 include the parasitic capacitances due to PCB routing.

Equation 1.

Table 8-6 lists the electrical characteristics of the clock crystal.

Table 8-6 Crystal Electrical Characteristics (Oscillator Mode)

NAME	DESCRIPTION	MIN	TYP	MAX	UNIT
f_P	Parallel resonance crystal frequency	40			MHz
C_L	Crystal load capacitance	5	8	12	pF
ESR	Crystal ESR			50	Ω
Temperature range	Expected temperature range of operation	–40		125	°C
Frequency tolerance	Crystal frequency tolerance⁽¹⁾⁽²⁾	–200		200	ppm
Drive level			50	200	µW

(1) The crystal manufacturer's specification must satisfy this requirement.

(2) Includes initial tolerance of the crystal, drift over temperature, aging and frequency pulling due to incorrect load capacitance.

In the case where an external clock is used as the clock resource, the signal is fed to the CLKP pin only; CLKM is grounded. The phase noise requirement is very important when a 40-MHz clock is fed externally. Table 8-7 lists the electrical characteristics of the external clock signal.

Table 8-7 External Clock Mode Specifications

PARAMETER		SPECIFICATION			UNIT
PARAMETER		MIN	TYP	MAX	UNIT
Input Clock: External AC-coupled sine wave or DC-coupled square wave Phase Noise referred to 40 MHz	Frequency		40		MHz
	AC-Amplitude	700		1200	mV (pp)
	DC-t_rise/fall			10	ns
	Phase Noise at 1 kHz			–132	dBc/Hz
	Phase Noise at 10 kHz			–143	dBc/Hz
	Phase Noise at 100 kHz			–152	dBc/Hz
	Phase Noise at 1 MHz			–153	dBc/Hz
	Duty Cycle	35		65	%
	Freq Tolerance	–100		100	ppm