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ML145159RP Datenblatt(PDF) 5 Page - LANSDALE Semiconductor Inc. |
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ML145159RP Datenblatt(HTML) 5 Page - LANSDALE Semiconductor Inc. |
5 / 10 page www.lansdale.com Page 5 of 10 Issue A LANSDALE Semiconductor, Inc. ML145159 PIN DESCRIPTIONS INPUT PINS OSCin, OSCout Oscillator Input and Oscillator Output (PDIP, SOG – Pins 2, 3; SSOP – Pins 7, 8) These pins form an on–chip reference oscillator when con- nected to terminals of an external parallel–resonant crystal. Frequency–setting capacitors of appropriate value must be con- nected from OSCin to VSS and OSCout toVSS. OSCin may also serve as input for an externally–generated reference sig- nal. This signal will typically be AC coupled to OSCin, but for larger amplitude signals (standard CMOS logic levels), DC coupling may also be used. In the external reference mode, no connection is required to OSCout. fin Frequency Input (PDIP, SOG – Pin 10, SSOP – Pin 15) Input to the positive edge triggered divide–by–N and di- vide–by–A counters. fin is typically derived from a dual–mod- ulus prescaler and is AC coupled. This input has an inverter biased in the linear region to allow use with AC coupled sig- nals as low as 500 mV peak–to–peak or direct coupled signals swinging from VDD to VSS. DATA Serial Data Input (PDIP, SOG – Pin 12, SSOP – Pin 17) Counter and control information is shifted into this input. The last data bit entered goes into the one–bit control shift reg- ister. A logic 1 allows the reference counter information to be loaded into its 14–bit latch when ENB goes high. A logic 0 entered as the control bit disables the reference counter latch. The divide–by–A/divide–by–N counter latch is loaded, regard- less of the contents of the control register, when ENB goes high. The data entry format is shown in Figure 1. ENB Transparent Latch Enable (PDIP, SOG – Pin 13, SSOP – Pin 18) A logic high on this input allows data to be entered into the divide–by–A/divide–by–N latch and, if the control bit is high, into the reference counter latch. Counter programming is unaf- fected when ENB is low. ENB should be kept normally low and pulsed high to transfer data to the latches. CLK Shift Register Clock (PDIP, SOG – Pin 11, SSOP – Pin 16) A low–to–high transition on this input shifts data from the serial data input into the shift registers. COMPONENT PINS CR Ramp Capacitor (PDIP, SOG – Pin 15, SSOP – Pin 20) The capacitor connected from this pin to VSS’ is charged lin- early, at a rate determined by RR. The voltage on this capacitor is proportional to the phase difference of the frequencies pres- ent at the internal phase detector inputs. A polystyrene or mylar capacitor is recommended. RR Ramp Current Bias Resistor (PDIP, SOG – Pin 20, SSOP – Pin 5) A resistor connected from this pin to VSS’ determines the rate at which the ramp capacitor is charged, thereby affecting the phase detector gain (see Figure 2). CH Hold Capacitor (PDIP, SOG – Pin 18, SSOP – Pin 3) The charge stored on the ramp capacitor is transferred to the capacitor connected from this pin to either VDD’ or VSS’. The ratio of CR to CH should be large enough to have no effect on the phase detector gain (CR > 10 CH). A low–leakage capaci- tor should be used. RO Output Bias Current Resistor (PDIP, SOG – Pin 1, SSOP – Pin 6) A resistor connected from this pin to VSS’ biases the output N–Channel transistor, thereby setting a current sink on the ana- log phase detector output. This resistor adjusts the APDout bias current (see Figure 3). OUTPUT PINS APDout Analog Phase Detector Output (PDIP, SOG – Pin 17, SSOP – Pin 2) This output produces a voltage that controls an external VCO. The voltage range of this output (VDD = + 9 V) is from below + 0.5 V to + 8 V or more. The source impedance of this output is the equivalent of a source follower with an externally variable source resistor. The source resistor depends upon the output bias current controlled by the output bias current resis- tor, RO. The bias current is adjustable from 0.01 mA to 0.5 mA. The output voltage is not more than 1.05 V below the sampled point on the ramp. With a constant sample of the ramp voltage at 9 V and the hold capacitor of 50 pF, the instan- taneous output ripple is about 5 mV peak–to–peak. Figure 1. Data Entry Format |
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