SNAS187D February   2003  – January 2016 LMX2430 , LMX2433 , LMX2434

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description continued
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 Recommended Operating Conditions
    3. 7.3 Thermal Information
    4. 7.4 Electrical Characteristics
    5. 7.5 Timing Requirements
    6. 7.6 Typical Characteristics
      1. 7.6.1 Sensitivity
      2. 7.6.2 Charge Pump
      3. 7.6.3 Input Impedance
  8. 8 Parameter Measurement Information
    1. 8.1 Bench Test Setups
      1. 8.1.1 LMX243x Charge-Pump Test Setup
      2. 8.1.2 Charge-Pump Current Specification Definitions
        1. 8.1.2.1 Charge-Pump Output Current Variation vs Charge-Pump Output Voltage
        2. 8.1.2.2 Charge-Pump Sink Current vs Charge-Pump Output Source Current Mismatch
        3. 8.1.2.3 Charge-Pump Output Current Variation vs Temperature
      3. 8.1.3 LMX243x FinRF Sensitivity Test Setup
      4. 8.1.4 LMX243x OSCin Sensitivity Test Setup
      5. 8.1.5 LMX243x FinRF Input Impedance Test Setup
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1  Reference Oscillator Input
      2. 9.3.2  Reference Dividers (R Counters)
      3. 9.3.3  Prescalers
      4. 9.3.4  Programmable Feedback Dividers (N Counters)
      5. 9.3.5  Phase / Frequency Detectors
        1. 9.3.5.1 Phase Comparator and Internal Charge-Pump Characteristics
      6. 9.3.6  Charge Pumps
      7. 9.3.7  Microwire Serial Interface
      8. 9.3.8  Multi-Function Outputs
        1. 9.3.8.1 Push-Pull Analog Lock-Detect Output
        2. 9.3.8.2 Open-Drain Analog Lock-Detect Output
        3. 9.3.8.3 Digital Filtered Lock-Detect Output
        4. 9.3.8.4 Reference Divider and Feedback Divider Output
      9. 9.3.9  Fastlock Output
      10. 9.3.10 Counter Reset
    4. 9.4 Device Functional Modes
      1. 9.4.1 Power Control
        1. 9.4.1.1 Synchronous Power-Down Mode
        2. 9.4.1.2 Asynchronous Power-Down Mode
    5. 9.5 Programming
      1. 9.5.1 Microwire Interface
      2. 9.5.2 Control Register Location
    6. 9.6 Register Maps
      1. 9.6.1 Control Register Content Map
      2. 9.6.2 R0 Register
        1. 9.6.2.1 RF_R[14:0] - RF Synthesizer Programmable Reference Divider (R Counter) (R0[17:3])
        2. 9.6.2.2 RF_CPP - RF Synthesizer Phase Detector Polarity (R0[18])
        3. 9.6.2.3 RF_CPG - RF Synthesizer Charge-Pump Current Gain (R0[19])
        4. 9.6.2.4 RF_CPT - RF Synthesizer Charge-Pump Tri-State (R0[20])
        5. 9.6.2.5 RF_RST - RF Synthesizer Counter Reset (R0[21])
      3. 9.6.3 R1 Register
        1. 9.6.3.1 LMX243x RF Synthesizer Swallow Counter
          1. 9.6.3.1.1 RF_A[3:0] - LMX2430/33 RF Synthesizer Swallow Counter (A Counter) (R1[6:3])
          2. 9.6.3.1.2 RF_A[4:0] - LMX2434 RF Synthesizer Swallow Counter (A Counter) (R1[7:3])
        2. 9.6.3.2 LMX243x RF Synthesizer Programmable Binary Counter
          1. 9.6.3.2.1 RF_B[14:0] - LMX2430/33 RF Synthesizer Programmable Binary Counter (B Counter) (R1[21:7])
          2. 9.6.3.2.2 RF_B[13:0] - LMX2434 RF Synthesizer Programmable Binary Counter (B Counter) (R1[21:8])
        3. 9.6.3.3 LMX243x RF Synthesizer Prescaler Select
          1. 9.6.3.3.1 RF_P - LMX2430/33 RF Synthesizer Prescaler Select (R1[22])
          2. 9.6.3.3.2 RF_P - LMX2434 RF Synthesizer Prescaler Select (R1[22])
        4. 9.6.3.4 RF_PD - RF Synthesizer Power Down (R1[23])
      4. 9.6.4 R2 Register
        1. 9.6.4.1 RF_TOC[0:11] - RF Synthesizer Time-Out Counter (R2[14:3])
        2. 9.6.4.2 R3 Register
          1. 9.6.4.2.1 IF_R[14:0] - IF Synthesizer Programmable Reference Divider (R Counter) (R3[17:3])
          2. 9.6.4.2.2 IF_CPP - IF Synthesizer Phase Detector Polarity (R3[18])
          3. 9.6.4.2.3 IF_CPG - IF Synthesizer Charge-Pump Current Gain (R3[19])
          4. 9.6.4.2.4 IF_CPT - IF Synthesizer Charge-Pump Tri-State (R3[20])
          5. 9.6.4.2.5 IF_RST - IF Synthesizer Counter Reset (R3[21])
      5. 9.6.5 R4 Register
        1. 9.6.5.1 IF_A[3:0] - IF Synthesizer Swallow Counter (A Counter) (R4[6:3])
        2. 9.6.5.2 IF_B[13:0] - IF Synthesizer Programmable Binary Counter (B Counter) (R4[20:7])
          1. 9.6.5.2.1 IF_P - IF Synthesizer Prescaler Select (R4[22])
        3. 9.6.5.3 IF_PD - IF Synthesizer Power Down (R4[23])
      6. 9.6.6 R5 Register
        1. 9.6.6.1 IF_TOC[0:11] - IF Synthesizer Time-Out Counter (R5[14:3])
      7. 9.6.7 MUX[3:0] - Multifunction Output Select (R3[23:22]:R0[23:22])
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
      3. 10.2.3 Application Curves
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Device Support
      1. 13.1.1 Device Nomenclature
        1. 13.1.1.1 List of Definitions
    2. 13.2 Related Links
    3. 13.3 Community Resources
    4. 13.4 Trademarks
    5. 13.5 Electrostatic Discharge Caution
    6. 13.6 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

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机械数据 (封装 | 引脚)
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订购信息

6 Pin Configuration and Functions

NPE Package
20-Pin ULGA Ultra Thin Chip Scale
Top View
LMX2430 LMX2433 LMX2434 20053539.png
PW Package
20-Pin TSSOP Thin Shrink Small Outline
Top View
LMX2430 LMX2433 LMX2434 20053583.png

Pin Functions

PIN I/O DESCRIPTION
NAME ULGA TSSOP
CLK 18 19 I MICROWIRE Clock input. High-impedance CMOS input. DATA is clocked into the 24-bit shift register on the rising edge of CLK.
CPoutIF 4 5 O IF PLL charge-pump output. The output is connected to the external loop filter, which drives the input of the IF VCO.
CPoutRF 12 13 O RF PLL charge-pump output. The output is connected to the external loop filter, which drives the input of the RF VCO.
DATA 19 20 I MICROWIRE Data input. High-impedance CMOS input. Binary serial data. The MSB of DATA is shifted in first. The two last bits are the control bits.
EN 3 4 I Chip Enable input. High-Impedance CMOS input. When this pin is set HIGH, the RF and IF PLLs are powered up. Power down 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).
ENosc 5 6 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.
FinIF 2 3 I IF PLL prescaler input. Small signal input from the VCO.
FLoutRF 10 11 O RF PLL fastlock output. This pin connects a resistor in parallel to R2 of the external loop filter. This pin can also function as a general-purpose CMOS tri-state output.
FinRF 14 15 I RF PLL prescaler input. Small-signal input from the VCO.
FinRF* 15 16 I RF PLL prescaler complementary input. For single-ended operation, this pin must be AC grounded through a 100-pF capacitor. The LMX243x can be driven differentially when the AC-coupled capacitor is omitted.
Ftest/LD 9 10 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.
GND 1 2 — Ground for the IF PLL analog and digital circuits, MICROWIRE, Ftest/LD and oscillator circuits.
11 12
13 14
LE 17 18 I MICROWIRE Latch Enable input. High-impedance CMOS input. When LE transitions HIGH, DATA stored in the shift register is loaded into one of 6 internal control registers.
OSCout/ FLoutIF 6 7 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.
OSCin 7 8 I Reference oscillator input. The input has an approximate Vcc/2 threshold and is driven by an external AC-coupled source.
Vcc 16 17 — Power supply bias for the RF PLL analog circuits. Vcc may range from 2.25 V to 2.75 V. Bypass capacitors must be placed as close as possible to this pin and be connected directly to the ground plane.
8 9
20 1
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