SBAS706D April   2015  – April 2019 ADS54J60

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     FFT for 170-MHz Input Signal
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 7 Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information
    5. 7.5  Electrical Characteristics
    6. 7.6  AC Characteristics
    7. 7.7  Digital Characteristics
    8. 7.8  Timing Requirements
    9. 7.9  Typical Characteristics
    10. 7.10 Typical Characteristics: Contour
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Analog Inputs
      2. 8.3.2 DDC Block
        1. 8.3.2.1 Decimate-by-2 Filter
        2. 8.3.2.2 Decimate-by-4 Filter Using a Digital Mixer
        3. 8.3.2.3 Decimate-by-4 Filter with IQ Outputs
      3. 8.3.3 SYSREF Signal
        1. 8.3.3.1 SYSREF Not Present (Subclass 0, 2)
      4. 8.3.4 Overrange Indication
        1. 8.3.4.1 Fast OVR
      5. 8.3.5 Power-Down Mode
    4. 8.4 Device Functional Modes
      1. 8.4.1 Device Configuration
        1. 8.4.1.1 Serial Interface
        2. 8.4.1.2 Serial Register Write: Analog Bank
        3. 8.4.1.3 Serial Register Readout: Analog Bank
        4. 8.4.1.4 JESD Bank SPI Page Selection
        5. 8.4.1.5 Serial Register Write: JESD Bank
          1. 8.4.1.5.1 Individual Channel Programming
        6. 8.4.1.6 Serial Register Readout: JESD Bank
      2. 8.4.2 JESD204B Interface
        1. 8.4.2.1 JESD204B Initial Lane Alignment (ILA)
        2. 8.4.2.2 JESD204B Test Patterns
        3. 8.4.2.3 JESD204B Frame
        4. 8.4.2.4 JESD204B Frame
        5. 8.4.2.5 JESD204B Frame Assembly with Decimation
          1. 8.4.2.5.1 JESD Transmitter Interface
          2. 8.4.2.5.2 Eye Diagram
    5. 8.5 Register Maps
      1. 8.5.1 Example Register Writes
      2. 8.5.2 Register Descriptions
        1. 8.5.2.1 General Registers
          1. 8.5.2.1.1 Register 0h (address = 0h)
            1. Table 20. Register 0h Field Descriptions
          2. 8.5.2.1.2 Register 1h (address = 1h)
            1. Table 21. Register 1h Field Descriptions
          3. 8.5.2.1.3 Register 2h (address = 2h)
            1. Table 22. Register 2h Field Descriptions
          4. 8.5.2.1.4 Register 3h (address = 3h)
            1. Table 23. Register 3h Field Descriptions
          5. 8.5.2.1.5 Register 4h (address = 4h)
            1. Table 24. Register 4h Field Descriptions
          6. 8.5.2.1.6 Register 5h (address = 5h)
            1. Table 25. Register 5h Field Descriptions
          7. 8.5.2.1.7 Register 11h (address = 11h)
            1. Table 26. Register 11h Field Descriptions
        2. 8.5.2.2 Master Page (080h) Registers
          1. 8.5.2.2.1  Register 20h (address = 20h), Master Page (080h)
            1. Table 27. Registers 20h Field Descriptions
          2. 8.5.2.2.2  Register 21h (address = 21h), Master Page (080h)
            1. Table 28. Register 21h Field Descriptions
          3. 8.5.2.2.3  Register 23h (address = 23h), Master Page (080h)
            1. Table 29. Register 23h Field Descriptions
          4. 8.5.2.2.4  Register 24h (address = 24h), Master Page (080h)
            1. Table 30. Register 24h Field Descriptions
          5. 8.5.2.2.5  Register 26h (address = 26h), Master Page (080h)
            1. Table 31. Register 26h Field Descriptions
          6. 8.5.2.2.6  Register 4Fh (address = 4Fh), Master Page (080h)
            1. Table 32. Register 4Fh Field Descriptions
          7. 8.5.2.2.7  Register 53h (address = 53h), Master Page (080h)
            1. Table 33. Register 53h Field Descriptions
          8. 8.5.2.2.8  Register 54h (address = 54h), Master Page (080h)
            1. Table 34. Register 54h Field Descriptions
          9. 8.5.2.2.9  Register 55h (address = 55h), Master Page (080h)
            1. Table 35. Register 55h Field Descriptions
          10. 8.5.2.2.10 Register 59h (address = 59h), Master Page (080h)
            1. Table 36. Register 59h Field Descriptions
        3. 8.5.2.3 ADC Page (0Fh) Register
          1. 8.5.2.3.1 Register 5F (address = 5F), ADC Page (0Fh)
            1. Table 37. Register 5F Field Descriptions
        4. 8.5.2.4 Main Digital Page (6800h) Registers
          1. 8.5.2.4.1  Register 0h (address = 0h), Main Digital Page (6800h)
            1. Table 38. Register 0h Field Descriptions
          2. 8.5.2.4.2  Register 41h (address = 41h), Main Digital Page (6800h)
            1. Table 39. Register 41h Field Descriptions
          3. 8.5.2.4.3  Register 42h (address = 42h), Main Digital Page (6800h)
            1. Table 41. Register 42h Field Descriptions
          4. 8.5.2.4.4  Register 43h (address = 43h), Main Digital Page (6800h)
            1. Table 42. Register 43h Field Descriptions
          5. 8.5.2.4.5  Register 44h (address = 44h), Main Digital Page (6800h)
            1. Table 43. Register 44h Field Descriptions
          6. 8.5.2.4.6  Register 4Bh (address = 4Bh), Main Digital Page (6800h)
            1. Table 44. Register 4Bh Field Descriptions
          7. 8.5.2.4.7  Register 4Dh (address = 4Dh), Main Digital Page (6800h)
            1. Table 45. Register 4Dh Field Descriptions
          8. 8.5.2.4.8  Register 4Eh (address = 4Eh), Main Digital Page (6800h)
            1. Table 46. Register 4Eh Field Descriptions
          9. 8.5.2.4.9  Register 52h (address = 52h), Main Digital Page (6800h)
            1. Table 47. Register 52h Field Descriptions
          10. 8.5.2.4.10 Register 72h (address = 72h), Main Digital Page (6800h)
            1. Table 48. Register 72h Field Descriptions
          11. 8.5.2.4.11 Register ABh (address = ABh), Main Digital Page (6800h)
            1. Table 49. Register ABh Field Descriptions
          12. 8.5.2.4.12 Register ADh (address = ADh), Main Digital Page (6800h)
            1. Table 50. Register ADh Field Descriptions
          13. 8.5.2.4.13 Register F7h (address = F7h), Main Digital Page (6800h)
            1. Table 51. Register F7h Field Descriptions
        5. 8.5.2.5 JESD Digital Page (6900h) Registers
          1. 8.5.2.5.1  Register 0h (address = 0h), JESD Digital Page (6900h)
            1. Table 52. Register 0h Field Descriptions
          2. 8.5.2.5.2  Register 1h (address = 1h), JESD Digital Page (6900h)
            1. Table 53. Register 1h Field Descriptions
          3. 8.5.2.5.3  Register 2h (address = 2h), JESD Digital Page (6900h)
            1. Table 55. Register 2h Field Descriptions
          4. 8.5.2.5.4  Register 3h (address = 3h), JESD Digital Page (6900h)
            1. Table 56. Register 3h Field Descriptions
          5. 8.5.2.5.5  Register 5h (address = 5h), JESD Digital Page (6900h)
            1. Table 57. Register 5h Field Descriptions
          6. 8.5.2.5.6  Register 6h (address = 6h), JESD Digital Page (6900h)
            1. Table 58. Register 6h Field Descriptions
          7. 8.5.2.5.7  Register 7h (address = 7h), JESD Digital Page (6900h)
            1. Table 59. Register 7h Field Descriptions
          8. 8.5.2.5.8  Register 16h (address = 16h), JESD Digital Page (6900h)
            1. Table 60. Register 16h Field Descriptions
          9. 8.5.2.5.9  Register 31h (address = 31h), JESD Digital Page (6900h)
            1. Table 61. Register 31h Field Descriptions
          10. 8.5.2.5.10 Register 32h (address = 32h), JESD Digital Page (6900h)
            1. Table 62. Register 32h Field Descriptions
        6. 8.5.2.6 JESD Analog Page (6A00h) Registers
          1. 8.5.2.6.1 Register 12h (address = 12h), JESD Analog Page (6A00h)
            1. Table 63. Register 12h-15h Field Descriptions
          2. 8.5.2.6.2 Registers 13h-15h (address = 13h-15h), JESD Analog Page (6A00h)
            1. Table 64. Register 13h-15h Field Descriptions
          3. 8.5.2.6.3 Register 16h (address = 16h), JESD Analog Page (6A00h)
            1. Table 65. Register 16h Field Descriptions
          4. 8.5.2.6.4 Register 17h (address = 17h), JESD Analog Page (6A00h)
            1. Table 66. Register 17h Field Descriptions
          5. 8.5.2.6.5 Register 1Ah (address = 1Ah), JESD Analog Page (6A00h)
            1. Table 67. Register 1Ah Field Descriptions
          6. 8.5.2.6.6 Register 1Bh (address = 1Bh), JESD Analog Page (6A00h)
            1. Table 68. Register 1Bh Field Descriptions
        7. 8.5.2.7 Offset Read Page (JESD BANK PAGE SEL = 6100h, JESD BANK PAGE SEL1 = 0000h) Registers
          1. 8.5.2.7.1 Register 068h (address = 068h), Offset Read Page
            1. Table 69. Register 068h Field Descriptions
          2. 8.5.2.7.2 Register 069h (address = 069h), Offset Read Page
            1. Table 70. Register 069h Field Descriptions
          3. 8.5.2.7.3 Registers 074h, 076h, 078h, 7Ah (address = 074h, 076h, 078h, 7Ah), Offset Read Page
            1. Table 71. Registers 074h, 076h, 078h, 7Ah Field Descriptions
          4. 8.5.2.7.4 Registers 075h, 077h, 079h, 7Bh (address = 075h, 077h, 079h, 7Bh), Offset Read Page
            1. Table 72. Registers 075h, 077h, 079h, 7Bh Field Descriptions
        8. 8.5.2.8 Offset Load Page (JESD BANK PAGE SEL= 6100h, JESD BANK PAGE SEL1 = 0500h) Registers
          1. 8.5.2.8.1 Registers 00h, 04h, 08h, 0Ch (address = 00h, 04h, 08h, 0Ch), Offset Load Page
            1. Table 73. Registers 00h, 04h, 08h, 0Ch Field Descriptions
          2. 8.5.2.8.2 Registers 01h, 05h, 09h, 0Dh (address = 01h, 05h, 09h, 0Dh), Offset Load Page
            1. Table 74. Registers 01h, 05h, 09h, 0Dh Field Descriptions
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Start-Up Sequence
      2. 9.1.2 Hardware Reset
      3. 9.1.3 SNR and Clock Jitter
      4. 9.1.4 DC Offset Correction Block in the ADS54J60
        1. 9.1.4.1 Freezing the DC Offset Correction Block
        2. 9.1.4.2 Effect of Temperature
      5. 9.1.5 Idle Channel Histogram
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
        1. 9.2.1.1 Transformer-Coupled Circuits
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
    1. 10.1 Power Sequencing and Initialization
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Community Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

9.1.3 SNR and Clock Jitter

The signal-to-noise ratio (SNR) of the ADC is limited by three different factors: quantization noise, thermal noise, and jitter, as shown in Equation 4. The quantization noise is typically not noticeable in pipeline converters and is 98 dB for a 16-bit ADC. The thermal noise limits the SNR at low input frequencies and the clock jitter sets the SNR for higher input frequencies.

Equation 4. ADS54J60 sgnl_to_noise_ratio_eq_sbas706.png

The SNR limitation resulting from sample clock jitter can be calculated by Equation 5:

Equation 5. ADS54J60 snr_limitation_eq_sbas706.png

The total clock jitter (TJitter) has two components: the internal aperture jitter (130 fs) is set by the noise of the clock input buffer and the external clock jitter. TJitter can be calculated by Equation 6:

Equation 6. ADS54J60 total_jitter_eq_sbas706.png

External clock jitter can be minimized by using high-quality clock sources and jitter cleaners as well as band-pass filters at the clock input. A faster clock slew rate also improves the ADC aperture jitter.

The ADS54J60 has a thermal noise of approximately 71.1 dBFS and an internal aperture jitter of 120 fs. The SNR, depending on the amount of external jitter for different input frequencies, is shown in Figure 141.

ADS54J60 D052_SBAS756.gifFigure 141. SNR versus Input Frequency and External Clock Jitter