MAX11905

20-Bit, 1.6Msps, Low-Power, Fully Differential

SAR ADC

www.maximintegrated.com

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TABLE OF CONTENTS (continued)

LIST OF FIGURES

LIST OF TABLES

Figure 1. Signal Ranges........................................................................ 14

Figure 2. Simplified Model of Input Sampling Circuit.................................................. 15

Figure 3. Conversion Frame, SAR Conversion, Track and Read Operation................................ 15

Figure 4. Ideal Transfer Characteristic ............................................................ 18

Figure 5. Read During Track Phase............................................................... 19

Figure 6. Read During SAR Conversion Phase...................................................... 19

Figure 7. Split Read Mode ...................................................................... 20

Figure 8. SPI Interface Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 9. DIN Timing for Register Write Operations .................................................. 21

Figure 10. Timing Diagram for Data Out Reading After Conversion ...................................... 21

Figure 11. Mode Register Write .................................................................. 22

Figure 12. Register Read ....................................................................... 22

Figure 13. Unipolar Single-Ended Input............................................................ 25

Figure 14. Bipolar Single-Ended Input............................................................. 25

Figure 15. Top Layer Sample Layout .............................................................. 26

Table 1. ADC Driver Amplifier Recommendation..................................................... 16

Table 2. Voltage Reference Configurations ......................................................... 17

Table 3. MAX11905 External Reference Recommendations............................................ 17

Table 4. Transfer Characteristic .................................................................. 18

Table 5. DOUT Driver Strength .................................................................. 23

Effective Number of Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Total Harmonic Distortion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Spurious-Free Dynamic Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Aperture Delay. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Aperture Jitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Full-Power Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Selector Guide ............................................................................... 28

Ordering Information .......................................................................... 28

Chip Information.............................................................................. 28

Package Information .......................................................................... 28

Revision History .............................................................................. 29