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LMX2433TM Datasheet(PDF) 3 Page - National Semiconductor (TI) |
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LMX2433TM Datasheet(HTML) 3 Page - National Semiconductor (TI) |
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3 / 49 page  Connection Diagrams Ultra Thin Chip Scale Package (SLE) (Top View) Thin Shrink Small Outline Package (TM) (Top View) 20053539 20053583 Pin Descriptions Pin No. UTCSP Pin No. TSSOP Pin Name I/O Description 1 2 GND — Ground for the IF PLL analog and digital circuits, MICROWIRE TM, Ftest/LD and oscillator circuits. 2 3 FinIF I IF PLL prescaler input. Small signal input from the VCO. 3 4 EN I Chip Enable input. High Impedance CMOS input. When this pin is set HIGH, the RF and IF PLLs are powered up. Powerdown is then controlled through the MICROWIRE. When this pin is set LOW, the device is asynchronously powered down and the charge pump output is forced to a high impedance state (TRI-STATE). 4 5 CPoutIF O IF PLL charge pump output. The output is connected to the external loop filter, which drives the input of the IF VCO. 5 6 ENosc I Oscillator Enable input. High impedance CMOS input. When this pin is set HIGH, the oscillator buffer is always powered up, independent of the state of the EN pin. When this pin is set LOW, the OSCout/ FLoutIF pin functions as an IF Fastlock output, which connects a resistor in parallel to R2 of the external loop filter. 6 7 OSCout/ FLoutIF O Oscillator output/ IF PLL Fastlock output. The output configuration is dependent on the state of the ENosc pin. When ENosc is set LOW, the pin functions as an IF Fastlock output, which connects a resistor in parallel to R2 of the external loop filter. This configuration also functions as a general purpose CMOS TRI-STATE output. When ENosc is set HIGH, the pin functions as an oscillator output so that an external crystal can be used. 7 8 OSCin I Reference oscillator input. The input has an approximate Vcc/2 threshold and is driven by an external AC coupled source. 8 9 Vcc — Power supply bias for the RF PLL digital circuits and oscillator circuits. Vcc may range from 2.25V to 2.75V. Bypass capacitors should be placed as close as possible to this pin and be connected directly to the ground plane. 9 10 Ftest/LD O Programmable multiplexed output. Functions as a general purpose CMOS TRI-STATE output, N and R divider output, RF/ IF PLL push-pull analog lock detect output, RF/ IF PLL open-drain analog lock detect output, or RF/ IF PLL digital filtered lock detect output. www.national.com 3 |
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