Datasheet AD7656, AD7657, AD7658 (Analog Devices) - 9

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Data Sheet AD7656/AD7657/AD7658 TIMING SPECIFICATIONS
AVCC/DVCC = 4.75 V to 5.25 V, VDD = 5 V to 16.5 V, VSS = −5 V to −16.5 V, VDRIVE = 2.7 V to 5.25 V, VREF = 2.5 V internal/external, TA = TMIN to TMAX, unless otherwise noted.1
Table 4. Limit at TMIN, TMAX Parameter VDRIVE < 4.75 V VDRIVE = 4.75 V to 5.25 V Unit Description
PARALLEL MODE tCONVERT 3 3 µs typ Conversion time, internal clock tQUIET 150 150 ns min Minimum quiet time required between bus relinquish and start of next conversion tACQ 550 550 ns min Acquisition time t10 25 25 ns min Minimum CONVST low pulse t1 60 60 ns max CONVST high to BUSY high tWAKE-UP 2 2 ms max STBY rising edge to CONVST rising edge 25 25 µs max Partial power-down mode PARALLEL WRITE OPERATION t11 15 15 ns min WR pulse width t12 0 0 ns min CS to WR setup time t13 5 5 ns min CS to WR hold time t14 5 5 ns min Data setup time before WR rising edge t15 5 5 ns min Data hold after WR rising edge PARALLEL READ OPERATION t 2 0 0 ns min BUSY to RD delay t3 0 0 ns min CS to RD setup time t4 0 0 ns min CS to RD hold time t5 45 36 ns min RD pulse width t6 45 36 ns max Data access time after RD falling edge t7 10 10 ns min Data hold time after RD rising edge t8 12 12 ns max Bus relinquish time after RD rising edge t9 6 6 ns min Minimum time between reads SERIAL INTERFACE fSCLK 18 18 MHz max Frequency of serial read clock t16 12 12 ns max Delay from CS until SDATA three-state disabled t 2 17 22 22 ns max Data access time after SCLK rising edge/CS falling edge t18 0.4 tSCLK 0.4 tSCLK ns min SCLK low pulse width t19 0.4 tSCLK 0.4 tSCLK ns min SCLK high pulse width t20 10 10 ns min SCLK to data valid hold time after SCLK falling edge t21 18 18 ns max CS rising edge to SDATA high impedance 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 A buffer is used on the data output pins for this measurement.
200µA IOL TO OUTPUT 1.6V PIN CL 25pF
002
200µA IOH
05020- Figure 2. Load Circuit for Digital Output Timing Specification Rev. D | Page 9 of 32 Document Outline Features Applications Functional Block Diagram General Description Product Highlights Table of Contents Revision History Specifications AD7656 AD7657 AD7658 Timing Specifications Absolute Maximum Ratings Thermal Resistance ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Terminology Theory of Operation Converter Details Track-and-Hold Section Analog Input Section ADC Transfer Function Reference Section Typical Connection Diagram Driving the Analog Inputs Interface Section Parallel Interface (SER/ = 0) Software Selection of ADCs Changing the Analog Input Range (/S SEL = 0) Changing the Analog Input Range (/S SEL = 1) Serial Interface (SER/ = 1) Serial Read Operation Daisy-Chain Mode (DCEN = 1, SER/ = 1) Standby/Partial Power-Down Modes of Operation Application Hints Layout Power Supply Configuration Outline Dimensions Ordering Guide