Datasheet AD7441, AD7451 (Analog Devices) - 4

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AD7441/AD7451 Parameter Test Conditions/Comments A Version B Version Unit
CONVERSION RATE Conversion Time 888 ns with an 18 MHz SCLK 16 16 SCLK cycles Track-and-Hold Acquisition Time1 Sine wave input 250 250 ns max Full-scale step input 290 290 ns max Throughput Rate 1 1 MSPS max POWER REQUIREMENTS VDD 2.7/5.25 2.7/5.25 V min/max I 6, 7 DD Normal Mode (Static) SCLK on or off 0.5 0.5 mA typ Normal Mode (Operational) VDD = 4.75 V to 5.25 V 1.95 1.95 mA max VDD = 2.7 V to 3.6 V 1.45 1.45 mA max Full Power-Down Mode SCLK on or off 1 1 μA max Power Dissipation Normal Mode (Operational) VDD = 5 V; 1.55 mW typical for 100 ksps6 9.25 9.25 mW max VDD = 3 V; 0.6 mW typical for 100 ksps6 4 4 mW max Full Power-Down VDD = 5 V; SCLK on or off 5 5 μW max VDD = 3 V; SCLK on or off 3 3 μW max 1 See Terminology section. 2 Analog inputs with slew rates exceeding 27 V/μs (full-scale input sine wave > 3.5 MHz) within the acquisition time can cause the converter to return an incorrect result. 3 A small dc input is applied to VIN– to provide a pseudo ground for VIN+. 4 The AD7451 is functional with a reference input in the range of 100 mV to VDD. 5 Guaranteed by characterization. 6 See the Power vs. Throughput Rate section. 7 Measured with a full-scale dc input. Rev. D | Page 4 of 24 Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION PRODUCT HIGHLIGHTS TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING SPECIFICATIONS TIMING DIAGRAMS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TERMINOLOGY THEORY OF OPERATION CIRCUIT INFORMATION CONVERTER OPERATION ADC TRANSFER FUNCTION TYPICAL CONNECTION DIAGRAM ANALOG INPUT ANALOG INPUT STRUCTURE DIGITAL INPUTS REFERENCE SERIAL INTERFACE Timing Example 1 Timing Example 2 MODES OF OPERATION NORMAL MODE POWER-DOWN MODE Power-Up Time POWER VS. THROUGHPUT RATE MICROPROCESSOR AND DSP INTERFACING AD7441/AD7451 to ADSP-21xx AD7441/AD7451 to TMS320C5x/C54x AD7441/AD7451 to DSP56xxx GROUNDING AND LAYOUT HINTS EVALUATING PERFORMANCE OUTLINE DIMENSIONS ORDERING GUIDE