ABB SDCS-PG6320 Sequence control module

LOL Detector Operation Using a Reference Clock In REFCLK mode, a reference clock is used as an acquisition aid to lock the ADN2816 VCO. Lock-to-reference mode is enabled by setting CTRLA[0] to 1. The user also needs to write to the CTRLA[7:6] and CTRLA[5:2] bits to set the reference frequency range and the divide ratio of the data rate with respect to the reference frequency. For more details, see the Reference Clock (Optional) section. In this mode, the lock detector monitors the difference in frequency between the divided down VCO and the divided down reference clock. The loss-of-lock signal, which appears on Pin 16 (LOL), is deasserted when the VCO is within 250 ppm of the desired frequency

This enables the D/PLL

which pulls the VCO frequency in the remaining amount with respect to the input data and acquires phase lock. Once locked, if the input frequency error exceeds 1000 ppm (0.1%), the loss-of-lock signal is reasserted and control returns to the frequency loop, which reacquires with respect to the reference clock. The LOL pin remains asserted until the VCO frequency is within 250 ppm of the desired frequency. This hysteresis is shown in Figure 15.

Static LOL Mode 

The ADN2816 implements a static LOL feature, which indicates if a loss-of-lock condition has ever occurred and remains asserted, even if the ADN2816 regains lock, until the static LOL bit is manually reset. The I2 C register bit, MISC[4], is the static LOL bit. If there is ever an occurrence of a loss-of-lock condition, this bit is internally asserted to logic high. The MISC[4] bit remains high even after the ADN2816 has reacquired lock to a new data rate. This bit can be reset by writing a 1 followed by 0 to I2 C Register Bit CTRLB[6]. Once reset, the MISC[4] bit remains deasserted until another loss-oflock condition occurs.

Company introduction

Temporal Ming sheng automation equipment co., LTD. Was established in April 02, 2021, registered jiujiang ruichang city in jiangxi province, east yi road no. 23 lake farmers 401 mall, the legal representative person Zhou Zuochen.

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