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LM2335 Dataheets PDF



Part Number LM2335
Manufacturers National Semiconductor
Logo National Semiconductor
Description PLLatinum Low Power Dual Frequency Synthesizer for RF Personal Communications
Datasheet LM2335 DatasheetLM2335 Datasheet (PDF)

LMX2335L/LMX2336L PLLatinum Low Power Dual Frequency Synthesizer for RF Personal Communications PRELIMINARY June 1999 LMX2335L/LMX2336L PLLatinum™ Low Power Dual Frequency Synthesizer for RF Personal Communications LMX2335L LMX2336L 1.1 GHz/1.1 GHz 2.0 GHz/1.1 GHz Features n Ultra low current consumption n 2.7V to 5.5V operation n Selectable synchronous and asynchronous powerdown mode: ICC = 1 µA (typ) n Dual modulus prescaler: 64/65 or 128/129 n Selectable charge pump TRI-STATE ® mode n Sele.

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LMX2335L/LMX2336L PLLatinum Low Power Dual Frequency Synthesizer for RF Personal Communications PRELIMINARY June 1999 LMX2335L/LMX2336L PLLatinum™ Low Power Dual Frequency Synthesizer for RF Personal Communications LMX2335L LMX2336L 1.1 GHz/1.1 GHz 2.0 GHz/1.1 GHz Features n Ultra low current consumption n 2.7V to 5.5V operation n Selectable synchronous and asynchronous powerdown mode: ICC = 1 µA (typ) n Dual modulus prescaler: 64/65 or 128/129 n Selectable charge pump TRI-STATE ® mode n Selectable charge pump current levels n Selectable Fastlock™ mode n Upgrade and compatible to LMX2335/36 n Small-outline, plastic, surface mount TSSOP package n LMX2336 available in CSP package General Description The LMX2335L and LMX2336L are monolithic, integrated dual frequency synthesizers, including two high frequency prescalers, and are designed for applications requiring two RF phase-lock loops. They are fabricated using National’s 0.5µ ABiC V silicon BiCMOS process. The LMX2335L/36L contains two dual modulus prescalers. A 64/65 or a 128/129 prescaler can be selected for each RF synthesizer. A second reference divider chain is included in the IC for improved system noise. The LMX2335L/36L combined with a high quality reference oscillator, two loop filters, and two external voltage controlled oscillators generates very stable low noise RF local oscillator signals. Serial data is transferred into the LMX2335L/36L via a three wire interface (Data, Enable, Clock). Supply voltage can range from 2.7V to 5.5V. The LMX2335L/36L feature very low current consumption; LMX2335L 4.0 mA at 5V, LMX2336L 5.5 mA at 5V. The LMX2335L is available in SO, TSSOP and CSP 16-pin surface mount plastic packages. The LMX2336L is available in a TSSOP 20-pin and CSP 24-pin surface mount plastic package. Applications n Cellular telephone systems (AMPS, ETACS, RCR-27) n Cordless telephone systems (DECT, ISM , PHS, CT-1+) n Personal Communication Systems (DCS-1800, PCN-1900) n Dual Mode PCS phones n Cable TV Tuners (CATV) n Other wireless communication systems Functional Block Diagram DS012807-1 TRI-STATE ® is a registered trademark of National Semiconductor Corporation. Fastlock™, MICROWIRE™ and PLLatinum™ are trademarks of National Semiconductor Corporation. © 1999 National Semiconductor Corporation DS012807 www.national.com Connection Diagrams LMX2335L (Top View) LMX2336L (Top View) DS012807-2 Order Number LMX2335LM or LM2335LTM NS Package Number M16A and MTC16 LMX2335L (Top View) DS012807-3 Order Number LMX2336LTM NS Package Number MTC20 LMX2336L (Top View) DS012807-38 Order Number LMX2335LSLB NS Package Number SLB16A DS012807-36 Order Number LMX2336LSLB NS Package Number SLB24A Pin Descriptions Pin No. 2336LTM 1 Pin No. 24 Pin No. 1 Pin No. 2335LSLB 16 Pin Name VCC1 Power supply voltage input for RF1 analog and RF1 digital circuits. Input may range from 2.7V to 5.5V. VCC1 must equal VCC2. Bypass capacitors should be placed as close as possible to this pin and be connected directly to the ground plane. Power supply for RF1 charge pump. Must be ≥ VCC. O RF1 charge pump output. For connection to a loop filter for driving the input of an external VCO. LMX2335L: Ground for RF1 analog and RF1 digital circuits. LMX2336L: Ground for RF digital circuits. I I RF1 prescaler input. Small signal input from the VCO. RF1 prescaler complementary input. A bypass capacitor should be placed as close as possible to this pin and be connected directly to the ground plane. Capacitor is optional with loss of some sensitivity. Ground for RF1 analog circuitry. 2 I/O Description 2336LSLB 2335LTM 2 3 4 5 6 2 3 4 5 6 2 3 4 5 X 1 2 3 4 X Vp1 D o1 GND fIN 1 /fIN 1 7 www.national.com 7 X X GND Pin Descriptions Pin No. 2336LTM 8 9 10 Pin No. 8 10 11 (Continued) Pin No. 2335LSLB 5 6 7 Pin Name OSCin OSCout FoLD I O O Oscillator input. The input has a VCC/2 input threshold and can be driven from an external CMOS or TTL logic gate. Oscillator output. Multiplexed output of the programmable or reference dividers, lock detect signals and Fastlock mode. CMOS output (see Programmable Modes). High impedance CMOS Clock input. Data for the various latches is clocked in on the rising edge, into the 20-bit shift register. Binary serial data input. Data entered MSB first. The last two bits are the control bits. High impedance CMOS input. Load enable high impedance CMOS input. When LE goes HIGH, data stored in the shift registers is loaded into one of the 4 appropriate latches (control bit dependent). Ground for RF2 analog circuitry. I RF2 prescaler complementary input. A bypass capacitor should be placed as close as possible to this pin and be connected directly to the ground plane. Capacitor is optional with loss of some sensitivity. RF2 prescaler input. Small signal input from the VCO. LMX2335L: Ground for RF2 analog, RF2 digital, MICROWIRE, FoLD and Oscillator circuits. LMX2336L: Ground for IF digital, MICROWIRE, FoLD and oscillator circuits. O RF2 ch.


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