Datasheet AD7171 (Analog Devices) - 6

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Data Sheet AD7171 TIMING CHARACTERISTICS
VDD = 2.7 V to 5.25 V, GND = 0 V, Input Logic 0 = 0 V, Input Logic 1 = VDD, unless otherwise noted.
Table 3. Parameter1, 2 Limit at TMIN, TMAX Unit Test Conditions/Comments
READ t1 100 ns min SCLK high pulse width t2 100 ns min SCLK low pulse width t 3 3 0 ns min SCLK active edge to data valid delay4 60 ns max VDD = 4.75 V to 5.25 V 80 ns max VDD = 2.7 V to 3.6 V t4 10 ns min SCLK inactive edge to DOUT/RDY high RESET t5 100 ns min PDRST low pulse width t6 25 ms typ PDRST high to data valid delay 1 Sample tested during initial release to ensure compliance. All input signals are specified with tR = tF = 5 ns (10% to 90% of VDD) and timed from a voltage level of 1.6 V. 2 See Figure 3. 3 These numbers are measured with the load circuit shown in Figure 2 and defined as the time required for the output to cross the VOL or VOH limits. 4 SCLK active edge is the falling edge of SCLK.
Timing Diagrams ISINK (1.6mA WITH VDD = 5V, 100µA WITH VDD = 3V) TO OUTPUT 1.6V PIN 50pF I
002
SOURCE (200µA WITH VDD = 5V, 100µA WITH VDD = 3V)
08417- Figure 2. Load Circuit for Timing Characterization
DOUT/RDY (O) MSB LSB t t4 3 t1 SCLK (I) t2
003
I = INPUT, O = OUTPUT
08417- Figure 3. Read Cycle Timing Diagram
PDRST (I) t5 t6 DOUT/RDY (O)
004
I = INPUT, O = OUTPUT
08417- Figure 4. Resetting the AD7171 Rev. C | Page 5 of 16 Document Outline FEATURES INTERFACE APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING CHARACTERISTICS Timing Diagrams ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS OUTPUT NOISE AND RESOLUTION SPECIFICATIONS ADC CIRCUIT INFORMATION OVERVIEW FILTER, DATA RATE, AND SETTLING TIME GAIN POWER-DOWN/RESET (PDRST\) ANALOG INPUT CHANNEL BIPOLAR CONFIGURATION DATA OUTPUT CODING REFERENCE DIGITAL INTERFACE GROUNDING AND LAYOUT APPLICATIONS INFORMATION TEMPERATURE SYSTEM SIGNAL CONDITIONING CIRCUIT OUTLINE DIMENSIONS ORDERING GUIDE