ADIN1110CCPZ-R7 datasheet(26/104 Pages) AD

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Data Sheet

ADIN1110

APPLICATIONS INFORMATION

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Rev. 0 | 26 of 104

Assuming the following:

►

CPCB1 ≈ CPCB2 ≈ CPCB

►

CX1 ≈ CX2 ≈ CXx

Then, CXx = 2 × CL – CPCB – 3 pF

Choose precision capacitors for CXx with low appreciable tempera-

ture coefficient to minimize frequency errors. Ensure good ground

connections on CX1, CX2, the package ground of the quartz resona-

tor, and the ground paddle of the ADIN1110 package.

Figure 18. Crystal Oscillator Connection

External Clock Input

If using a single-ended reference clock on XTAL_I/CLK_IN, leave

XTAL_O open-circuit. This clock must be an ac-coupled 0.8 V

p-p to 2.5 V p-p sine or (filtered) square wave signal. This signal

also applies when connecting the CLK25_REF output clock from

one 10BASE-T1L device to the XTAL_I/CLK_IN input of another

10BASE-T1L device.

If VS p-p < 2.5 V p-p,

►

C2 is not required

►

C1 = 1 nF

If VS p-p ≥ 2.5 V p-p

►

C2 = 10 pF

►

C1 = 2.5 (13 pF + CPCBx) / (VS p-p – 2.5)

Figure 19. External Clock Connection

802.1AS SUPPORT

Typically, any device operating in an 802.1AS network executes the

following operations periodically:

►

Generate peer delay request and handle response

►

Receive peer delay request and generate response

►

Receive synchronization frame (slave clock)

►

Transmit synchronization frame (master clock)

These features require that the MAC is capable of time stamping

specific incoming and outgoing frames.

To assist with these features, the ADIN1110 MAC provides the

following hardware:

►

Internal free-running counter

►

Syntonized counter

►

Waveform generation on TS_TIMER output

Internal Free Running Counter

The ADIN1110 has an internal free running counter running at 120

MHz. This counter provides an accuracy of 8.333 ns. When using

this counter, there is a period of approximately 35 s. This period

ensures that the clock does not wrap during any of the necessary

operations, for example, between receipt of peer delay request and

transmission of the response.

To enable the free running counter, the TS_EN bits must be set to

When the free running counter is enabled, the ADIN1110 captures

the time stamp for all received frames, and it is appended before

each data frame received. The time stamps of transmitted frames

are captured when requested. See Time Stamp Capture for more

details.

ADIN1110CCPZ-R7 数据表(PDF) 26 Page - Analog Devices

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