SBAS745B December   2015  – January 2023 ADS54J66

PRODUCTION DATA  

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  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
    6. 6.6  AC Performance
    7. 6.7  Digital Characteristics
    8. 6.8  Timing Requirements
    9. 6.9  Typical Characteristics: General (DDC Mode-8)
    10. 6.10 Typical Characteristics: Mode 2
    11. 6.11 Typical Characteristics: Mode 0
  7. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Analog Inputs
      2. 7.3.2 Recommended Input Circuitry
    4. 7.4 Device Functional Modes
      1. 7.4.1 Digital Features
      2. 7.4.2 Mode 0, Decimation-by-2 with IQ Outputs for up to 220 MHz of IQ Bandwidth
      3. 7.4.3 Mode 2, Decimation-by-2 for up to 110 MHz of Real Bandwidth
      4. 7.4.4 Modes 4 and 7, Decimation-by-2 with Real Outputs for up to 110 MHz of Bandwidth
      5. 7.4.5 Mode 5, Decimation-by-2 with IQ Outputs for up to 110 MHz of IQ Bandwidth
      6. 7.4.6 Mode 6, Decimation-by-4 with IQ Outputs for up to 110 MHz of IQ Bandwidth
      7. 7.4.7 Overrange Indication
      8. 7.4.8 Power-Down Mode
    5. 7.5 Programming
      1. 7.5.1 Device Configuration
        1. 7.5.1.1 Details of the Serial Interface
        2. 7.5.1.2 Serial Register Write: Analog Bank
        3. 7.5.1.3 Serial Register Readout: Analog Bank
        4. 7.5.1.4 JESD Bank SPI Page Selection
        5. 7.5.1.5 Serial Register Write: Digital Bank
        6. 7.5.1.6 Individual Channel Programming
        7. 7.5.1.7 Serial Register Readout: JESD Bank
      2. 7.5.2 JESD204B Interface
        1. 7.5.2.1 JESD204B Initial Lane Alignment (ILA)
        2. 7.5.2.2 JESD204B Frame Assembly
        3. 7.5.2.3 JESD Output Switch
          1. 7.5.2.3.1 SERDES Transmitter Interface
          2. 7.5.2.3.2 SYNCb Interface
          3. 7.5.2.3.3 Eye Diagram
    6. 7.6 Register Maps
      1. 7.6.1 Detailed Register Information
      2. 7.6.2 Example Register Writes
      3. 7.6.3 Register Descriptions
        1. 7.6.3.1 General Registers
          1. 7.6.3.1.1 Register 0h (offset = 0h) [reset = 0h]
          2. 7.6.3.1.2 Register 3h, 4h (offset = 3h, 4h) [reset = 0h]
          3. 7.6.3.1.3 Register 5h (offset = 5h) [reset = 0h]
          4. 7.6.3.1.4 Register 11h (offset = 11h) [reset = 0h]
        2. 7.6.3.2 Master Page (80h)
          1. 7.6.3.2.1  Register 20h (address = 20h) [reset = 0h], Master Page (080h)
          2. 7.6.3.2.2  Register 21h (address = 21h) [reset = 0h], Master Page (080h)
          3. 7.6.3.2.3  Register 23h (address = 23h), Master Page (080h)
          4. 7.6.3.2.4  Register 24h (address = 24h) [reset = 0h], Master Page (080h)
          5. 7.6.3.2.5  Register 26h (address = 26h), Master Page (080h)
          6. 7.6.3.2.6  Register 3Ah (address = 3Ah) [reset = 0h], Master Page (80h)
          7. 7.6.3.2.7  Register 39h (address = 39h) [reset = 0h], Master Page (80h)
          8. 7.6.3.2.8  Register 53h (address = 53h) [reset = 0h], Master Page (80h)
          9. 7.6.3.2.9  Register 54h (address = 54h) [reset = 0h], Master Page (80h)
          10. 7.6.3.2.10 Register 55h (address = 55h) [reset = 0h], Master Page (80h)
          11. 7.6.3.2.11 Register 56h (address = 56h) [reset = 0h], Master Page (80h)
          12. 7.6.3.2.12 Register 59h (address = 59h) [reset = 0h], Master Page (80h)
        3. 7.6.3.3 ADC Page (0Fh)
          1. 7.6.3.3.1  Register 5Fh (address = 5Fh) [reset = 0h], ADC Page (0Fh)
          2. 7.6.3.3.2  Register 60h (address = 60h) [reset = 0h], ADC Page (0Fh)
          3. 7.6.3.3.3  Register 61h (address = 61h) [reset = 0h], ADC Page (0Fh)
          4. 7.6.3.3.4  Register 6Ch (address = 6Ch) [reset = 0h], ADC Page (0Fh)
          5. 7.6.3.3.5  Register 6Dh (address = 6Dh) [reset = 0h], ADC Page (0Fh)
          6. 7.6.3.3.6  Register 74h (address = 74h) [reset = 0h], ADC Page (0Fh)
          7. 7.6.3.3.7  Register 75h (address = 75h) [reset = 0h], ADC Page (0Fh)
          8. 7.6.3.3.8  Register 76h (address = 76h) [reset = 0h], ADC Page (0Fh)
          9. 7.6.3.3.9  Register 77h (address = 77h) [reset = 0h], ADC Page (0Fh)
          10. 7.6.3.3.10 Register 78h (address = 78h) [reset = 0h], ADC Page (0Fh)
        4. 7.6.3.4 Interleaving Engine Page (6100h)
          1. 7.6.3.4.1 Register 18h (address = 18h) [reset = 0h], Interleaving Engine Page (6100h)
          2. 7.6.3.4.2 Register 68h (address = 68h) [reset = 0h], Interleaving Engine Page (6100h)
        5. 7.6.3.5 Decimation Filter Page (6141h) Registers
          1. 7.6.3.5.1 Register 0h (address = 0h) [reset = 0h], Decimation Filter Page (6141h)
          2. 7.6.3.5.2 Register 1h (address = 1h) [reset = 0h], Decimation Filter Page (6141h)
          3. 7.6.3.5.3 Register 2h (address = 2h) [reset = 0h], Decimation Filter Page (6141h)
        6. 7.6.3.6 Main Digital Page (6800h) Registers
          1. 7.6.3.6.1 Register 0h (address = 0h) [reset = 0h], Main Digital Page (6800h)
          2. 7.6.3.6.2 Register 42h (address = 42h) [reset = 0h], Main Digital Page (6800h)
          3. 7.6.3.6.3 Register 4Eh (address = 4Eh) [reset = 0h], Main Digital Page (6800h)
          4. 7.6.3.6.4 Register ABh (address = ABh) [reset = 0h], Main Digital Page (6800h)
          5. 7.6.3.6.5 Register ADh (address = ADh) [reset = 0h], Main Digital Page (6800h)
          6. 7.6.3.6.6 Register F7h (address = F7h) [reset = 0h], Main Digital Page (68h)
        7. 7.6.3.7 JESD Digital Page (6900h) Registers
          1. 7.6.3.7.1 Register 0h (address = 0h) [reset = 0h], JESD Digital Page (6900h)
          2. 7.6.3.7.2 Register 1h (address = 1h) [reset = 0h], JESD Digital Page (6900h)
          3. 7.6.3.7.3 Register 2h (address = 2h) [reset = 0h], JESD Digital Page (6900h)
          4. 7.6.3.7.4 Register 3h (address = 3h) [reset = 0h], JESD Digital Page (6900h)
          5. 7.6.3.7.5 Register 5h (address = 5h) [reset = 0h], JESD Digital Page (6900h)
          6. 7.6.3.7.6 Register 6h (address = 6h) [reset = 0h], JESD Digital Page (6900h)
          7. 7.6.3.7.7 Register 21h (address = 21h) [reset = 0h], JESD Digital Page (6900h)
          8. 7.6.3.7.8 Register 22h (address = 22h) [reset = 0h], JESD Digital Page (6900h)
        8. 7.6.3.8 JESD Analog Page (6A00h) Register
          1. 7.6.3.8.1 Register 12h, 13h (address 12h, 13h) [reset = 0h], JESD Analog Page (6Ah)
          2. 7.6.3.8.2 Register 16h (address = 16h) [reset = 0h], JESD Analog Page (6A00h)
          3. 7.6.3.8.3 Register 17h (address = 17h) [reset = 0h], JESD Analog Page (6A00h)
          4. 7.6.3.8.4 Register 1Bh (address = 1Bh) [reset = 0h], JESD Analog Page (6A00h)
  8. Application Information Disclaimer
    1. 8.1 Application Information
      1. 8.1.1 Start-Up Sequence
      2. 8.1.2 Hardware Reset
        1. 8.1.2.1 Register Initialization
        2. 8.1.2.2 115
      3. 8.1.3 SYSREF Signal
      4. 8.1.4 SNR and Clock Jitter
      5. 8.1.5 Idle Channel Histogram
      6. 8.1.6 ADC Test Pattern
        1. 8.1.6.1 ADC Section
        2. 8.1.6.2 Transport Layer Pattern
        3. 8.1.6.3 Link Layer Pattern
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
      1. 8.3.1 Power Sequencing and Initialization
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  9. Device and Documentation Support
    1. 9.1 Receiving Notification of Documentation Updates
    2. 9.2 Support Resources
    3. 9.3 Trademarks
    4. 9.4 Electrostatic Discharge Caution
    5. 9.5 Glossary
  10. 10Mechanical, Packaging, and Orderable Information

Package Options

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

Layout Guidelines

The device evaluation module (EVM) layout can be used as a reference layout to obtain the best performance. A layout diagram of the EVM top layer is provided in Figure 8-10. A complete layout of the EVM is available at the ADS54J66 EVM folder. Some important points to remember during board layout are:

  • Analog inputs are located on opposite sides of the device pinout for minimum crosstalk on the package level. To minimize crosstalk onboard, the analog inputs must exit the pinout in opposite directions, as shown in the reference layout of Figure 8-10 as much as possible.
  • Connect INP of all unused analog inputs to AVDD and the INM to GND or vice versa.

  • In the device pinout, the sampling clock is located on a side perpendicular to the analog inputs in order to minimize coupling between them. This configuration is also maintained on the reference layout of Figure 8-10 as much as possible.
  • Keep digital outputs away from the analog inputs. When these digital outputs exit the pinout, the digital output traces must not be kept parallel to the analog input traces because this configuration can result in coupling from the digital outputs to the analog inputs and degrade performance. All digital output traces to the receiver [such as a field-programmable gate array (FPGA) or an application-specific integrated circuit (ASIC)] must be matched in length to avoid skew among outputs.
  • Connect a 100 Ohm differential resistor across unused SERDES outputs to limit the swing which will occur if unterminated.

  • At each power-supply pin (AVDD, DVDD, or AVDDD3V), keep a 0.1-µF decoupling capacitor close to the device. A separate decoupling capacitor group consisting of a parallel combination of 10-µF, 1-µF, and 0.1-µF capacitors can be kept close to the supply source.