Datasheet AD7623 (Analog Devices) - 7

AD7623 SERIAL CLOCK TIMING SPECIFICATIONS Table 4. Serial Clock Timings in Master Read After Convert Mode DIVSCLK[1] 0 0 1 1 DIVSCLK[0] Symbol 0 1 0 1 Unit
SYNC to SCLK First Edge Delay Minimum t18 0.5 3 3 3 ns Internal SCLK Period Minimum t19 8 16 32 64 ns Internal SCLK Period Maximum t19 12 25 50 100 ns Internal SCLK High Minimum t20 2 6 15 31 ns Internal SCLK Low Minimum t21 3 7 16 32 ns SDOUT Valid Setup Time Minimum t22 1 5 5 5 ns SDOUT Valid Hold Time Minimum t23 0 0.5 10 28 ns SCLK Last Edge to SYNC Delay Minimum t24 0 0.5 9 26 ns BUSY High Width Maximum t28 0.780 1.000 1.440 2.320 μs
500
μ
A IOL TO OUTPUT 1.4V PIN CL 50pF 2V 500
μ
A IOH 0.8V NOTE t t DELAY DELAY IN SERIAL INTERFACE MODES, THE SYNC, SCLK, AND SDOUT ARE DEFINED WITH A MAXIMUM LOAD. 2V 2V C
05574-002
L OF 10pF; OTHERWISE, THE LOAD IS 60pF MAXIMUM. 0.8V 0.8V
05574-003 Figure 2. Load Circuit for Digital Interface Timing, Figure 3. Voltage Reference Levels for Timing SDOUT, SYNC, and SCLK Outputs, CL = 10 pF Rev. 0 | Page 6 of 28 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM PRODUCT HIGHLIGHTS SPECIFICATIONS TIMING SPECIFICATIONS SERIAL CLOCK TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TERMINOLOGY TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION CIRCUIT INFORMATION CONVERTER OPERATION TRANSFER FUNCTIONS TYPICAL CONNECTION DIAGRAM ANALOG INPUTS DRIVER AMPLIFIER CHOICE Single-to-Differential Driver VOLTAGE REFERENCE INPUT Internal Reference (PDBUF = Low, PDREF = Low) External 1.2 V Reference and Internal Buffer (PDREF = High, PBBUF = Low) External Reference (PDBUF = High, PRBUF = High) Reference Decoupling Temperature Sensor POWER SUPPLY Power Sequencing Power-Up POWER DISSIPATION VS. THROUGHPUT CONVERSION CONTROL INTERFACES DIGITAL INTERFACE RESET PARALLEL INTERFACE Master Parallel Interface Slave Parallel Interface 8-Bit Interface (Master or Slave) SERIAL INTERFACE MASTER SERIAL INTERFACE Internal Clock SLAVE SERIAL INTERFACE External Clock External Discontinuous Clock Data Read After Conversion External Clock Data Read During Previous Conversion MICROPROCESSOR INTERFACING SPI Interface (ADSP-219x) APPLICATION LAYOUT EVALUATING THE AD7623 PERFORMANCE OUTLINE DIMENSIONS ORDERING GUIDE