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LMX1601 Datasheet(PDF) 2 Page - National Semiconductor (TI) |
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LMX1601 Datasheet(HTML) 2 Page - National Semiconductor (TI) |
2 / 14 page Connection Diagram Pin Description Pin No. Pin Name I/O Description 1 FoLD O Multiplexed output of the Main/Aux programmable or reference dividers and Main/Aux lock detect. CMOS output. (See Programming Description 2.5) 2 OSC IN I PLL reference input which drives both the Main and Aux R counter inputs. Has about 1.2V input threshold and can be driven from an external CMOS or TTL logic gate. Typically connected to a TCXO output. Can be used with an external resonator (See Programming Description 2.5.4). 3 OSC OUT O Oscillator output. Used with an external resonator. 4 GND — Aux PLL ground. 5 fin AUX I Aux prescaler input. Small signal input from the VCO. 6V CCAUX — Aux PLL power supply voltage input. Must be equal to V CCMAIN. May range from 2.7V to 3.6V. Bypass capacitors should be placed as close as possible to this pin and be connected directly to the ground plane. 7 CPo AUX O Aux PLL Charge Pump output. Connected to a loop filter for driving the control input of an external VCO. 8EN AUX I Powers down the Aux PLL when LOW (N and R counters, prescaler, and tristates charge pump output). Bringing EN AUX HIGH powers up the Aux PLL. 9EN MAIN I Powers down the Main PLL when LOW (N and R counters, prescaler, and tristates charge pump output). Bringing EN MAIN HIGH powers up the Main PLL. 10 CPo MAIN O Main PLL Charge Pump output. Connected to a loop filter for driving the control input of an external VCO. 11 V CCMAIN — Main PLL power supply voltage input. Must be equal to V CCAUX. May range from 2.7V to 3.6V. Bypass capacitors should be placed as close as possible to this pin and be connected directly to the ground plane. 12 fin MAIN I Main prescaler input. Small signal input from the VCO. 13 GND — Main PLL ground. 14 LE I Load enable high impedance CMOS input. Data stored in the shift registers is loaded into one of the 4 internal latches when LE goes HIGH (control bit dependent). 15 Data I High impedance CMOS input. Binary serial data input. Data entered MSB first. The last two bits are the control bits. 16 Clock I High impedance CMOS Clock input. Data for the various counters is clocked in on the rising edge, into the 18-bit shift register. DS100129-2 Order Number LMX1600TM, LMX1601TM, or LMX1602TM NS Package Number MTC16 www.national.com 2 |
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