SLAS904F October   2012  – May 2016 ADS42LB49 , ADS42LB69

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Electrical Characteristics: ADS42LB69 (16-Bit)
    6. 6.6  Electrical Characteristics: ADS42LB49 (14-Bit)
    7. 6.7  Electrical Characteristics: General
    8. 6.8  Digital Characteristics
    9. 6.9  Timing Requirements: General
    10. 6.10 Timing Requirements: DDR LVDS Mode
    11. 6.11 Timing Requirements: QDR LVDS Mode
    12. 6.12 Typical Characteristics: ADS42LB69
    13. 6.13 Typical Characteristics: ADS42LB49
    14. 6.14 Typical Characteristics: Common
    15. 6.15 Typical Characteristics: Contour
      1. 6.15.1 Spurious-Free Dynamic Range (SFDR): General
      2. 6.15.2 Signal-to-Noise Ratio (SNR): ADS42LB69
      3. 6.15.3 Signal-to-Noise Ratio (SNR): ADS42LB49
  7. 7 Parameter Measurement Information
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagrams
    3. 8.3 Feature Description
      1. 8.3.1 Digital Gain
      2. 8.3.2 Input Clock Divider
      3. 8.3.3 Overrange Indication
        1. 8.3.3.1 OVR in a QDR Pinout
        2. 8.3.3.2 OVR in a DDR Pinout
        3. 8.3.3.3 Programming Threshold for Fast OVR
      4. 8.3.4 LVDS Buffer
      5. 8.3.5 Output Data Format
    4. 8.4 Device Functional Modes
      1. 8.4.1 Digital Output Information
        1. 8.4.1.1 Output Interface
        2. 8.4.1.2 DDR LVDS Outputs
        3. 8.4.1.3 QDR LVDS Outputs
    5. 8.5 Programming
      1. 8.5.1 Device Configuration
      2. 8.5.2 Details of Serial Interface
        1. 8.5.2.1 Register Initialization
        2. 8.5.2.2 Serial Register Write
        3. 8.5.2.3 Serial Register Readout
    6. 8.6 Register Maps
      1. 8.6.1 Description of Serial Interface Registers
        1. 8.6.1.1  Register 6 (offset = 06h) [reset = 80h]
        2. 8.6.1.2  Register 7 (offset = 07h) [reset = 00h]
        3. 8.6.1.3  Register 8 (offset = 08h) [reset = 00h]
        4. 8.6.1.4  Register B (offset = 0Bh) [reset = 00h]
        5. 8.6.1.5  Register C (offset = 0Ch) [reset = 00h]
        6. 8.6.1.6  Register D (offset = 0Dh) [reset = 6Ch]
        7. 8.6.1.7  Register F (offset = 0Fh) [reset = 00h]
        8. 8.6.1.8  Register 10 (offset = 10h) [reset = 00h]
        9. 8.6.1.9  Register 11 (offset = 11h) [reset = 00h]
        10. 8.6.1.10 Register 12 (offset = 12h) [reset = 00h]
        11. 8.6.1.11 Register 13 (offset = 13h) [reset = 00h]
        12. 8.6.1.12 Register 14 (offset = 14h) [reset = 00h]
        13. 8.6.1.13 Register 15 (offset = 15h) [reset = 00h]
        14. 8.6.1.14 Register 16 (offset = 16h) [reset = 00h]
        15. 8.6.1.15 Register 17 (offset = 17h) [reset = 00h]
        16. 8.6.1.16 Register 18 (offset = 18h) [reset = 00h]
        17. 8.6.1.17 Register 1F (offset = 1Fh) [reset = 7Fh]
        18. 8.6.1.18 Register 20 (offset = 20h) [reset = 00h]
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Analog Input
          1. 9.2.2.1.1 Drive Circuit Requirements
          2. 9.2.2.1.2 Driving Circuit
          3. 9.2.2.1.3 Using the ADS42LBx9 In Time-Domain, Low-Frequency Pulse Applications
        2. 9.2.2.2 Clock Input
        3. 9.2.2.3 SNR and Clock Jitter
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Related Links
    2. 12.2 Community Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

1 Features

  • Dual Channel
  • 14- and 16-Bit Resolution
  • Maximum Clock Rate: 250 MSPS
  • Analog Input Buffer with High Impedance Input
  • Flexible Input Clock Buffer with
    Divide-by-1, -2, and -4
  • 2-VPP and 2.5-VPP Differential Full-Scale Input (SPI-Programmable)
  • DDR or QDR LVDS Interface
  • 64-Pin VQFN Package (9-mm × 9-mm)
  • Power Dissipation: 820 mW/ch
  • Aperture Jitter: 85 fS
  • Internal Dither
  • Channel Isolation: 100 dB
  • Performance at fIN = 170 MHz at 2 VPP, –1 dBFS
    • SNR: 73.2 dBFS
    • SFDR:
      • 87 dBc (HD2 and HD3)
      • 100 dBc (Non HD2 and HD3)
  • Performance at fIN = 170 MHz:
    2.5 VPP, –1 dBFS
    • SNR: 74.9 dBFS
    • SFDR:
      • 85 dBc (HD2 and HD3)
      • 97 dBc (Non HD2 and HD3)

2 Applications

  • Communication and Cable Infrastructure
  • Multi-Carrier, Multimode Cellular Receivers
  • Radar and Smart Antenna Arrays
  • Broadband Wireless
  • Test and Measurement Systems
  • Software-Defined and Diversity Radios
  • Microwave and Dual-Channel I/Q Receivers
  • Repeaters
  • Power Amplifier Linearization

3 Description

The ADS42LB49 and ADS42LB69 are a family of high-linearity, dual-channel, 14- and 16-bit,
250-MSPS, analog-to-digital converters (ADCs) supporting DDR and QDR LVDS output interfaces. The buffered analog input provides uniform input impedance across a wide frequency range while minimizing sample-and-hold glitch energy. A sampling clock divider allows more flexibility for system clock architecture design. The ADS42LBx9 provides excellent spurious-free dynamic range (SFDR) over a large input frequency range with low-power consumption.

Device Information(1)

PART NUMBER PACKAGE INTERFACE OPTION
ADS42LB49 VQFN (64) 14-bit DDR or QDR LVDS
14-bit JESD204B
ADS42LB69 VQFN (64) 16-bit DDR or QDR LVDS
16-bit JESD204B
  1. For all available packages, see the orderable addendum at the end of the datasheet.

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Simplified Schematic

ADS42LB49 ADS42LB69 fbd_2x_ddr_las904.gif
ADS42LB49 ADS42LB69 fp_g3_LAS904.gif