Datasheet AD9278 (Analog Devices) - 6

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AD9278 Data Sheet DIGITAL SPECIFICATIONS
AVDD1 = 1.8 V, AVDD2 = 3.0 V, DRVDD = 1.8 V, 1.0 V internal ADC reference, full temperature, unless otherwise noted.
Table 2. Parameter1 Temperature Min Typ Max Unit
CLOCK INPUTS (CLK+, CLK−) Logic Compliance CMOS/LVDS/LVPECL Differential Input Voltage2 Full 250 mV p-p Input Common-Mode Voltage Full 1.2 V Input Resistance (Differential) 25°C 20 kΩ Input Capacitance 25°C 1.5 pF CW 4LO INPUTS (4LO+, 4LO−) Logic Compliance CMOS/LVDS/LVPECL Differential Input Voltage2 Full 250 mV p-p Input Common-Mode Voltage Full 1.2 V Input Resistance (Differential) 25°C 20 kΩ Input Capacitance 25°C 1.5 pF LOGIC INPUTS (PDWN, STBY, SCLK, RESET) Logic 1 Voltage Full 1.2 3.6 V Logic 0 Voltage Full 0.3 V Input Resistance 25°C 30 kΩ Input Capacitance 25°C 0.5 pF LOGIC INPUT (CSB) Logic 1 Voltage Full 1.2 3.6 V Logic 0 Voltage Full 0.3 V Input Resistance 25°C 70 kΩ Input Capacitance 25°C 0.5 pF LOGIC OUTPUT (SDIO)3 Logic 1 Voltage (IOH = 800 μA) Full 1.2 DRVDD + 0.3 V Logic 0 Voltage (IOL = 50 μA) Full 0 0.3 V Input Resistance 25°C 30 Input Capacitance 25°C 2 DIGITAL OUTPUTS (DOUTx+, DOUTx−), (ANSI-644) Logic Compliance LVDS Differential Output Voltage (VOD) Full 247 454 mV Output Offset Voltage (VOS) Full 1.125 1.375 V Output Coding (Default) Offset binary DIGITAL OUTPUTS (DOUTx+, DOUTx−), (LOW POWER, REDUCED SIGNAL OPTION) Logic Compliance LVDS Differential Output Voltage (VOD) Full 150 250 mV Output Offset Voltage (VOS) Full 1.10 1.30 V Output Coding (Default) Offset binary LOGIC OUTPUT (GPO0/GPO1/GPO2/GPO3) Logic 0 Voltage (IOL = 50 μA) Full 0.05 V 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 Specified for LVDS and LVPECL only. 3 Specified for 13 SDIO pins sharing the same connection. Rev. A | Page 6 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