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ML145159P1 Folha de dados(PDF) 6 Page - LANSDALE Semiconductor Inc. |
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ML145159P1 Folha de dados(HTML) 6 Page - LANSDALE Semiconductor Inc. |
6 / 10 page www.lansdale.com Page 6 of 10 Issue A LANSDALE Semiconductor, Inc. ML145159 CHARGE Ramp Charge Indicator (PDIP, SOG – Pin 4, SSOP – Pin 9) This output is high from the time fR goes high to the time fV goes high (fR and fV are the frequencies at the phase detec- tor inputs). This high voltage indicates that the ramp capacitor, CR, is being charged. FSO Three–State Frequency Steering Output (PDIP, SOG –Pin 6, SSOP – Pin 11) If the counted down input frequency on fin is higher than the counted down reference frequency of OSCin, this output goes low. If the counted down VCO frequency is lower than that of the counted down OSCin, this output goes high. The repetition rate of the frequency steering output pulses is approximately equal to the difference of the frequencies of the two counted down inputs from the VCO and OSCin. See Application Note AN969 for further information. LD Lock Detector Indicator (PDIP, SOG – Pin 9, SSOP – Pin 14) This output is high during lock and goes low to indicate a non–lock condition. The frequency and duration of the non–lock pulses will be the same as either polarity of the fre- quency steering output. MC Dual Modulus Prescaler Control (PDIP, SOG – Pin 8, SSOP – Pin 13) The modulus control level is low at the beginning of a count cycle and remains low until the divide–by–A counter has counted down from its programmed value. At that time, the modulus control goes high and remains high until the di- vide–by–N counter has counted the rest of the way down from its programmed value (N – A additional counts since both divide–by–N and divide–by–A are counting down during the first portion of the cycle). Modulus control is then set back low, the counters preset to their respective programmed values, and the above sequence repeated. This provides for a total pro- grammable divide value of NT = N • P + A, where P and P + 1 represent the dual modulus prescaler divide values respectively for high and low modulus control levels, N is the number pro- grammed into the divide–by–N counter, and A is the number programmed into the divide–by–A counter. SRout Shift Register Output (PDIP, SOG – Pin 14, SSOP – Pin 19) This pin is the non–inverted output of the last stage of the 32–bit serial data shift register. It is not latched by the ENB line. If unused, SRout should be floated. POWER SUPPLY VDD Positive Power Supply (PDIP, SOG – Pin 5, SSOP – Pin 10) Positive power supply input for all sections of the device except the analog phase detector. VDD and VDD’ should be powered up at the same time to avoid damage to the ML145159. VDD must be tied to the same potential asVDD’. VSS Negative Power Supply (PDIP, SOG – Pin 7, SSOP – Pin 12) Circuit ground for all sections of the ML145159 except the analog phase detector. VSS must be tied to the same potential as VSS’. VSS’ Analog Phase Detector Circuit Ground (PDIP, SOG – Pin 16, SSOP – Pin 1) Separate power supply and ground inputs are provided to help reduce the effects in the analog section of noise coming from the digital sections of this device and the surrounding cir- cuitry. VDD’ Analog Power Supply (PDIP, SOG – Pin 19, SSOP – Pin 4) Separate power supply and ground inputs are provided to help reduce the effects in the analog section of noise coming from the digital sections of this device and the surrounding cir- cuitry. |
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