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Q-67106-H6514 데이터시트(PDF) 11 Page - Siemens Semiconductor Group |
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Q-67106-H6514 데이터시트(HTML) 11 Page - Siemens Semiconductor Group |
11 / 35 page 30%530%7 &LUFXLW'HVFULSWLRQ Semiconductor Group 11 02.97 This is done as follows: 1.Setting of synchronous data acquisition by status 2. 2.Programming of the r-counter, status 1 (optional)-data is being loaded into shadow registers. 3.Programming of the n- or n/a-counter-data is being loaded into shadow registers, the EN-signal starts the synchronous loading procedure. 4.Synchronous programming – which means data transfer of all data from the shadow registers to the data registers – takes place at that point in time when the respective counter reaches “zero + 1”, the maximum repetition rate for channel change is therefore I FI:N. 5.Transfer of status 1 information into the corresponding data register is tied to the n- counter loading, but follows the loading of the n-data register in the distance of one n- counter dividing ratio, this guarantees that for example a new PD-current value becomes valid at the same time when the counters are loaded with the new data. Synchronous avoids additional phase error caused by programming. Synchronous data acquisition is of especial advantage, when large steps in frequency are to be made in a short time. For this purpose a high reference frequency can be programmed in order to achieve rapid – “rough” – transient response. This method increases the fundamental frequency nearly by the square route of the reference frequency relation. When rough lock is achieved, another synchronous data transfer is needed to switch back to the original channel spacing. A “fine” lock in will finish the total step response. It may not be necessary to change reference frequency, but it make sense to perform synchronous data acquisition in any case. Especially for GSM, PCN, DECT, DAMPS, JDC, PHP systems the synchronous mode should be used to get best performance of the PMB 2306T. 6WDQGE\ &RQGLWLRQ The PMB 2306T has two standby modes (standby 1, 2) to reduce the current consumption. Standby 1 switches off the whole circuit, the current consumption is reduced below 1 µA. Standby 2 switches off the counters, the charge pump and the outputs, only the preamplifiers stay active. The standby modes do not affect the port output signal. For the influence on the other output signals VHHVWDQGE\ WDEOH 1RWH I51 I91 Φ51 DQG Φ91 DUH WKHLQYHUWHGVLJQDOVRI I5 I9 Φ5 DQG Φ9 |
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