Datasheet AD9278 (Analog Devices) - 7

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Data Sheet AD9278 SWITCHING SPECIFICATIONS
AVDD1 = 1.8 V, AVDD2 = 3.0 V, DRVDD = 1.8 V, full temperature, unless otherwise noted.
Table 3. Parameter1 Temperature Min Typ Max Unit
CLOCK2 Clock Rate 25 MSPS (Mode II) Full 18.5 25 MHz 40 MSPS (Mode I) Full 18.5 40 MHz 50 MSPS (Mode III) Full 18.5 50 MHz 65 MSPS (Mode IV) Full 18.5 65 MHz Clock Pulse Width High (tEH) Full 4.8 ns Clock Pulse Width Low (tEL) Full 4.8 ns OUTPUT PARAMETERS2, 3 Propagation Delay (tPD) Full (tSAMPLE/2) + 1.5 (tSAMPLE/2) + 2.3 (tSAMPLE/2) + 3.1 ns Rise Time (tR) (20% to 80%) Full 300 ps Fall Time (tF) (20% to 80%) Full 300 ps FCO Propagation Delay (tFCO) Full (tSAMPLE/2) + 1.5 (tSAMPLE/2) + 2.3 (tSAMPLE/2) + 3.1 ns DCO Propagation Delay (tCPD)4 Full tFCO + (tSAMPLE/24) ns DCO to Data Delay (tDATA)4 Full (tSAMPLE/24) − 300 (tSAMPLE/24) (tSAMPLE/24) + 300 ps DCO to FCO Delay (tFRAME)4 Full (tSAMPLE/24) − 300 (tSAMPLE/24) (tSAMPLE/24) + 300 ps Data-to-Data Skew (tDATA-MAX − tDATA-MIN) Full ±100 ±350 ps Wake-Up Time (Standby), GAIN+ = 0.5 V 25°C 2 µs Wake-Up Time (Power-Down) 25°C 1 ms Pipeline Latency Full 8 Clock cycles APERTURE Aperture Uncertainty (Jitter) 25°C <1 ps rms LO GENERATION 4LO Frequency Full 4 40 MHz LO Divider RESET Setup Time5 Full 5 ns LO Divider RESET Hold Time5 Full 5 ns LO Divider RESET High Pulse Width Full 20 ns 1 See the AN-835 Application Note, Understanding High Speed ADC Testing and Evaluation, for a complete set of definitions and information about how these tests were completed. 2 Can be adjusted via the SPI. 3 Measurements were made using a part soldered to FR-4 material. 4 tSAMPLE/24 is based on the number of bits divided by 2 because the delays are based on half duty cycles. 5 RESET edge to rising 4LO edge. Rev. A | Page 7 of 44 Document Outline Features General Description Functional Block Diagram Revision History Specifications AC Specifications Digital Specifications Switching Specifications ADC Timing Diagrams Absolute Maximum Ratings Thermal Impedance ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics TGC Mode CW Doppler Mode Equivalent Circuits Ultrasound Theory of Operation Channel Overview TGC Operation Low Noise Amplifier (LNA) Active Impedance Matching LNA Noise Input Overdrive Variable Gain Amplifier (VGA) Gain Control VGA Noise Antialiasing Filter (AAF) ADC Clock Input Considerations Clock Duty Cycle Considerations Clock Jitter Considerations Power Dissipation and Power-Down Mode Power and Ground Recommendations Digital Outputs and Timing SDIO Pin SCLK Pin CSB Pin RBIAS Pin Voltage Reference CW Doppler Operation Quadrature Generation I/Q Demodulator and Phase Shifter Dynamic Range and Noise Phase Compensation and Analog Beamforming CW Application Information Serial Port Interface (SPI) Hardware Interface Memory Map Reading the Memory Map Table Reserved Locations Default Values Logic Levels Outline Dimensions Ordering Guide