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Details, datasheet, quote on part number:LMX2336
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| Part: | LMX2336 |
| Category: | Communication => Freq/Signal Converters/Generators |
| Description: | Pllatinum 1.1 GHZ Dual Frequency Synthesizer For RF Personal Communications |
| Company: | National Semiconductor Corporation |
| Datasheet: | Download LMX2336 datasheet File size : 402 kB |
| Request For quote: | Find where to buy LMX2336
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Datasheet text preview:
LMX2335/LMX2336/LMX2337 PLLatinum Dual Frequency Synthesizer for RF Personal Communications
September 1996
LMX2335/LMX2336/LMX2337 PLLatinumTM Dual Frequency Synthesizer for RF Personal Communications
LMX2335 LMX2336 LMX2337 1.1 GHz/1.1 GHz 2.0 GHz/1.1 GHz 550 MHz/550 MHz
both a JEDEC SO and TSSOP 16-pin surface mount plastic package. The LMX2336 is available in a TSSOP 20-pin surface mount plastic package.
Features
n 2.7V to 5.5V operation n Low current consumption n Selectable 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 FastLockTM mode
General Description
The LMX2335, LMX2336 and LMX2337 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 ABiC IV silicon BiCMOS process. The LMX2335/36/37 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. LMX2335/36/37, which employ a digital phase locked loop technique, combined with a high quality reference oscillator and loop filters, provide the tuning voltages for voltage controlled oscillators to generate very stable low noise RF local oscillator signals. Serial data is transferred into the LMX2335/36/37 via a three wire interface (Data, Enable, Clock). Supply voltage can range from 2.7V to 5.5V. The LMX2335/36/37 feature very low current consumption; LMX2335/37 -10 mA at 3V, LMX2336 -13 mA at 3V. The LMX2335/37 are available in
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 CATV n Other wireless communication systems
Functional Block Diagram
DS012332-1
TRI-STATE ® is a registered trademark of National Semiconductor Corporation. FastlockTM, MICROWIRETM and PLLatinumTM are trademarks of National Semiconductor Corporation.
© 2000 National Semiconductor Corporation
DS012332
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LMX2335/LMX2336/LMX2337
Connection Diagrams
LMX2335/LMX2337 LMX2336
DS012332-2
Order Number LMX2335M/LMX2335TM or LMX2337M/LMX2337TM NS Package Number M16A and MTC16
DS012332-16
Order Number LMX2336TM NS Package Number MTC20
Pin Descriptions
Pin No. 2335/37 1 Pin No. 2336 1 Pin Name VCC1 I/O Description 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. LMX2335/37: Ground for RF1 analog and RF1 digital circuits. LMX2336: Ground for RF digital circuitry. I I First RF 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. I O O I I I 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. LMX2335/37: Ground for RF2 analog, RF2 digital, MICROWIRETM, FoLD and Oscillator circuits. LMX2336: Ground for RF2 digital, MICROWIRE, FoLD and Oscillator circuits. O RF2 charge pump output. For connection to a loop filter for driving the input of an external VCO. Power supply for RF2 charge pump. Must be VCC.
2 3 4 5 X
2 3 4 5 6
Vp1 Do1 GND fIN1 fIN1
X 6 7 8 9 10 11 X X
7 8 9 10 11 12 13 14 15
GND OSCin OSCout FoLD Clock Data LE GND fIN2
12 13 14 15
16 17 18 19
fIN2 GND Do2 V p2
I
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LMX2335/LMX2336/LMX2337
Pin Descriptions
Pin No. 2335/37 16 Pin No. 2336 20
(Continued) I/O Description Power supply voltage input for RF2 analog. RF2 digital, MICROWIRE, FoLD and Oscillator circuits. Input may range from 2.7V to 5.5V. VCC2 must equal VCC1. Bypass capacitors should be placed as close as possible to this pin and be connected directly to the ground plane.
Pin Name VCC2
Block Diagram
DS012332-17
Note: VCC1 supplies power to the RF1 prescaler, N-counter, R-counter, and phase detector. VCC2 supplies power to the RF2 prescaler, N-counter, phase detector, R-counter along with the OSCin buffer, MICROWIRE, and FoLD. VCC1 and VCC2 are clamped to each other by diodes and must be run at the same voltage level. VP1 and VP2 can be run separately as long as VP VCC.
LMX2335/37 Pin # 8/10 LMX2336 Pin # Pin Name FoLD X signifies a function not available
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