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9702-11 Datasheet(PDF) 11 Page - Peregrine Semiconductor Corp. |
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9702-11 Datasheet(HTML) 11 Page - Peregrine Semiconductor Corp. |
11 / 13 page Product Specification PE9702 Page 11 of 13 Document No. 70-0036-02 │ www.psemi.com ©2003-2006 Peregrine Semiconductor Corp. All rights reserved. PD_U pulses result in an increase in VCO frequency and PD_D results in a decrease in VCO frequency. A lock detect output, LD is also provided, via the pin Cext. Cext is the logical “NAND” of PD_U and PD_D waveforms, which is driven through a series 2k ohm resistor. Connecting Cext to an external shunt capacitor provides integration. Cext also drives the input of an internal inverting comparator with an open drain output. Thus LD is an “AND” function of PD_U and PD_D. See Figure 4 for a schematic of this circuit. Enhancement Register The functions of the enhancement register bits are shown below with all bits active “high”. Table 9. Enhancement Register Bit Functionality ** Program to 0 Phase Detector The phase detector is triggered by rising edges from the main Counter (fp) and the reference counter (fc). It has two outputs, namely PD_U, and PD_D. If the divided VCO leads the divided reference in phase or frequency (fp leads fc), PD_D pulses “low”. If the divided reference leads the divided VCO in phase or frequency (fr leads fp), PD_U pulses “low”. The width of either pulse is directly proportional to phase offset between the two input signals, fp and fc. The phase detector gain is 430 mV / radian. PD_U and PD_D are designed to drive an active loop filter which controls the VCO tune voltage. Bit Function Description Bit 0 Reserved** Bit 1 Reserved** Bit 2 Reserved** Bit 3 Power down Power down of all functions except programming interface. Bit 4 Counter load Immediate and continuous load of counter programming as directed by the Bmode and Smode inputs. Bit 5 MSEL output Drives the internal dual modulus prescaler modulus select (MSEL) onto the Dout output. Bit 6 Prescaler output Drives the raw internal prescaler output (fmain) onto the Dout output. Bit 7 fp, fc OE fp, fc outputs disabled. |
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