NRF51422-QFAC-R7 datasheet(40/115 Pages) NORDIC

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Page 40

nRF51422 Product Specification v3.1

8.1.2

16 MHz crystal oscillator (16M XOSC)

Table 22 16 MHz crystal oscillator

Symbol

Description

Note

Min.

Typ.

Max.

Units

Test

level

fNOM,X16M

Crystal frequency.

MHz

N/A

fTOL,X16M,ANT

Frequency tolerance, ANT.1

1. The Frequency tolerance relates to the amount of time the radio can be in transmit mode. See

Table 38 on page 51.

±502

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

itance.

ppm

N/A

fTOL,X16M,BLE

Frequency tolerance, Bluetooth low

energy applications.1

±402

ppm

N/A

RS,X16M

Equivalent series resistance.

C0 ≤ 7 pF, CL,MAX ≤ 16 pF

C0 ≤ 5 pF, CL,MAX ≤ 12 pF

C0 ≤ 3 pF, CL,MAX ≤ 12 pF

100

150

200

N/A

PD,X16M

Drive level.

100

μW

N/A

Cpin

Input capacitance on XC1 and XC2

pads.

IX16M

Run current for 16 MHz crystal

oscillator.

SMD 2520 CL = 8 pF

4703

3. This number includes the current used by the automated power and clock management system.

μA

IX16M,1M

Run current for the 16 MHz crystal

oscillator when used only for a Timer

at 1 MHz or less.

SMD 2520 CL = 8pF

2503

μA

ISTBY,X16M

Standby current for 16 MHz crystal

oscillator.4

4. Standby current is the current drawn by the oscillator when there are no resources requesting the 16M, meaning there

is no clock management active (see

Table 33 on page 48). This value will depend on type of crystal.

SMD 2520 CL = 8 pF

μA

ISTART,XOSC

Startup current for 16 MHz crystal

oscillator.

1.1

tSTART,XOSC

Startup time for 16 MHz crystal

oscillator.

SMD 2520 CL = 8 pF

400

5005

5. Crystals with other specification than SMD 2520 may have much longer startup times.

μs

tSTART,X16M

Total startup time

(tSTART,XOSC + debounce period).

6. This is the time from when the crystal oscillator is powered up until its output becomes available to the system. It

includes both the crystal startup time and the debounce period.

SMD 2520 CL = 8 pF

800

μs

NRF51422-QFAC-R7 Datasheet(PDF) 40 Page - Nordic Semiconductor

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