Datasheet AD7298 (Analog Devices) - 5

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AD7298 Parameter Min Typ Max Unit Test Conditions/Comments
LOGIC INPUTS Input High Voltage, VINH 0.7 × VDRIVE V Input Low Voltage, VINL +0.3 × VDRIVE V Input Current, IIN ±0.01 ±1 μA VIN = 0 V or VDRIVE Input Capacitance, C 3 IN 3 pF LOGIC OUTPUTS Output High Voltage, VOH VDRIVE − 0.3 V VDRIVE < 1.8 VDRIVE − 0.2 V VDRIVE ≥ 1.8 Output Low Voltage, VOL 0.4 V Floating State Leakage Current ±0.01 ±1 μA Floating State Output Capacitance3 8 pF INTERNAL TEMPERATURE SENSOR Operating Range −40 +125 Accuracy ±1 ±2 °C TA = −40°C to +85°C ±1 ±3 °C TA = +85°C to +125°C Resolution 0.25 °C LSB size CONVERSION RATE Conversion Time 1 t2 + 16 × tSCLK μs For VIN0 to VIN7, with one cycle latency 100 μs TSENSE temperature sensor channel Track-and-Hold Acquisition Time3 100 ns Full-scale step input Throughput Rate 1 MSPS fSCLK = 20 MHz, for analog voltage conversions, one cycle latency 10 KSPS For the TSENSE channel, one cycle latency POWER REQUIREMENTS Digital inputs = 0 V or VDRIVE VDD 2.8 3 3.6 V VDRIVE 1.65 3 3.6 V I 6 TOTAL VDD = 3.6 V, VDRIVE = 3.6 V Normal Mode (Operational) 5.8 6.3 mA Normal Mode (Static) 4.1 4.6 mA Partial Power-Down Mode 2.7 3.3 mA Full Power-Down Mode 1 1.6 μA TA = −40°C to +25°C 10 μA TA = −40°C to +125°C Power Dissipation7 Normal Mode (Operational) 17.4 18.9 mW VDD = 3 V, VDRIVE = 3 V 22.7 mW Normal Mode (Static) 14.8 16.6 mW Partial Power-Down Mode 9.8 11.9 mW Full Power-Down Mode 3.6 5.8 μW TA = −40°C to +25°C 36 μW TA = −40°C to +125°C 1 See the Terminology section. 2 All specifications expressed in decibels are referred to full-scale input, FSR, and tested with an input signal at 0.5 dB below full scale, unless otherwise specified. 3 Sample tested during initial release to ensure compliance. 4 Refers to Pin VREF specified for 25oC. 5 A correction factor may be required on the temperature sensor results when using an external VREF (see the Temperature Sensor Averaging section). 6 ITOTAL is the total current flowing in VDD and VDRIVE. 7 Power dissipation is specified with VDD = VDRIVE = 3.6 V, unless otherwise noted. Rev. B | Page 4 of 24 Document Outline FEATURES GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM PRODUCT HIGHLIGHTS TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION THERMAL RESISTANCE PIN CONFIGURATION AND FUNCTION DESCRIPTION TYPICAL PERFORMANCE CHARACTERISTICS TERMINOLOGY CIRCUIT INFORMATION CONVERTER OPERATION ANALOG INPUT ADC Transfer Function TEMPERATURE SENSOR OPERATION TEMPERATURE SENSOR AVERAGING Temperature Value Format VDRIVE THE INTERNAL OR EXTERNAL REFERENCE CONTROL REGISTER MODES OF OPERATION TRADITIONAL MULTICHANNEL MODE OF OPERATION REPEAT OPERATION POWER-DOWN MODES Normal Mode Partial Power-Down Mode Full Power-Down Mode POWERING UP THE AD7298 RESET SERIAL INTERFACE TEMPERATURE SENSOR READ LAYOUT AND CONFIGURATION POWER SUPPLY BYPASSING AND GROUNDING TEMPERATURE MONITORING OUTLINE DIMENSIONS ORDERING GUIDE