Datasheet AD9648 (Analog Devices) - 7

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AD9648 Data Sheet AD9648-105 AD9648-125 Parameter1 Temp Min Typ Max Min Typ Max Unit
SPURIOUS-FREE DYNAMIC RANGE (SFDR) fIN = 9.7 MHz 25°C 98 96 dBc fIN = 30.5 MHz 25°C 90 90 dBc fIN = 70 MHz 25°C 93 91 dBc Full 86 82 dBc fIN = 100 MHz 25°C 92 90 dBc fIN = 200 MHz 25°C 81 84 dBc WORST OTHER (HARMONIC OR SPUR) fIN = 9.7 MHz 25°C −98 −97 dBc fIN = 30.5 MHz 25°C −96 −97 dBc fIN = 70 MHz 25°C −96 −97 dBc Full −91 −90 dBc fIN = 100 MHz 25°C −92 −92 dBc fIN = 200 MHz 25°C −90 −90 dBc TWO-TONE SFDR fIN = 29 MHz (−7 dBFS ), 32 MHz (−7 dBFS ) 25°C 84 84 dBc CROSSTALK2 Full −95 −95 dB ANALOG INPUT BANDWIDTH 25°C 650 650 MHz 1 See the AN-835 Application Note, Understanding High Speed ADC Testing and Evaluation, for a complete set of definitions. 2 Crosstalk is measured at 100 MHz with −1.0 dBFS on one channel and no input on the alternate channel.
DIGITAL SPECIFICATIONS
AVDD = 1.8 V, DRVDD = 1.8 V, maximum sample rate, VIN = −1.0 dBFS differential input, 1.0 V internal reference, and DCS enabled, unless otherwise noted.
Table 3. AD9648-105/AD9648-125 Parameter Temp Min Typ Max Unit
DIFFERENTIAL CLOCK INPUTS (CLK+, CLK−) Logic Compliance CMOS/LVDS/LVPECL Internal Common-Mode Bias Full 0.9 V Differential Input Voltage Full 0.3 3.6 V p-p Input Voltage Range Full AGND - 0.3 AVDD + 0.2 V Input Common-Mode Range Full 0.9 1.4 V High Level Input Current Full −10 +10 µA Low Level Input Current Full −10 +10 µA Input Capacitance Full 4 pF Input Resistance Full 8 10 12 kΩ LOGIC INPUT (CSB)1 High Level Input Voltage Full 1.22 DRVDD + 0.2 V Low Level Input Voltage Full 0 0.6 V High Level Input Current Full −10 +10 µA Low Level Input Current Full 40 132 µA Input Resistance Full 26 kΩ Input Capacitance Full 2 pF Rev. C | Page 6 of 41 Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM PRODUCT HIGHLIGHTS REVISION HISTORY GENERAL DESCRIPTION SPECIFICATIONS DC SPECIFICATIONS AC SPECIFICATIONS DIGITAL SPECIFICATIONS SWITCHING SPECIFICATIONS TIMING SPECIFICATIONS Timing Diagrams ABSOLUTE MAXIMUM RATINGS THERMAL CHARACTERISTICS ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS AD9648-125 AD9648-125 AD9648-105 EQUIVALENT CIRCUITS THEORY OF OPERATION ADC ARCHITECTURE ANALOG INPUT CONSIDERATIONS Input Common Mode Differential Input Configurations VOLTAGE REFERENCE Internal Reference Connection External Reference Operation CLOCK INPUT CONSIDERATIONS Clock Input Options Input Clock Divider Clock Duty Cycle Jitter Considerations CHANNEL/CHIP SYNCHRONIZATION POWER DISSIPATION AND STANDBY MODE DIGITAL OUTPUTS Digital Output Enable Function (OEB) TIMING Data Clock Output (DCO) OUTPUT TEST OUTPUT TEST MODES SERIAL PORT INTERFACE (SPI) CONFIGURATION USING THE SPI HARDWARE INTERFACE CONFIGURATION WITHOUT THE SPI SPI ACCESSIBLE FEATURES MEMORY MAP READING THE MEMORY MAP REGISTER TABLE Open Locations Default Values Logic Levels Channel-Specific Registers MEMORY MAP REGISTER TABLE MEMORY MAP REGISTER DESCRIPTIONS Power Modes (Register 0x08) Bits[7:6]—Open Bit 5—External Power-Down Pin Function Bits[4:2]—Open Bits[1:0]—Internal Power-Down Mode Enhancement Control (Register 0x0C) Bits[7:3]—Open Bit 2—Chop Mode Bits[1:0]—Open Output Mode (Register 0x14) Bits[7:6]—Output Port Logic Type Bit 5—Output Interleave Enable Bit 4—Output Port Disable Sync Control (Register 0x3A) Bits[7:3]—Open Bit 2—Clock Divider Next Sync Only Bit 1—Clock Divider Sync Enable Bit 0—Open Transfer (Register 0xFF) Sample Rate Override (Register 0x100) User I/O Control 2 (Register 0x101) Bit 7—OEB Pin Enable Bits[6:1]—Open Bit 0—SDIO Pull-Down User I/O Control 3 (Register 0x102) Bits[7:4]—Open Bit 3—VCM Power-Down Bits[2:0]—Open APPLICATIONS INFORMATION DESIGN GUIDELINES Power and Ground Recommendations LVDS Operation Clock Stability Considerations Exposed Paddle Thermal Heat Slug Recommendations VCM Reference Decoupling SPI Port OUTLINE DIMENSIONS ORDERING GUIDE