Datasheet AD7887 (Analog Devices) - 5

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AD7887 Data Sheet Parameter A Version1 B Version
1
Unit Test Conditions/Comments
CONVERSION RATE Throughput Time 16 16 SCLK cycles Conversion time plus acquisition time is 125 kSPS, with 2 MHz Clock Track/Hold Acquisition Time2 1.5 1.5 SCLK cycles Conversion Time 14.5 14.5 SCLK cycles 7.25 μs (2 MHz Clock) POWER REQUIREMENTS VDD +2.7/+5.25 +2.7/+5.25 V min/max IDD Normal Mode5 (Mode 2) Static 700 700 μA max Operational (fSAMPLE = 125 kSPS) 850 850 μA typ Internal reference enabled 700 700 μA typ Internal reference disabled Using Standby Mode (Mode 4) 450 450 μA typ fSAMPLE = 50 kSPS Using Shutdown Mode (Modes 1, 3) 120 120 μA typ fSAMPLE = 10 kSPS 12 12 μA typ fSAMPLE = 1 kSPS Standby Mode6 210 210 μA max VDD = 2.7 V to 5.25 V Shutdown Mode6 1 1 μA max VDD = 2.7 V to 3.6 V 2 2 μA max VDD = 4.75 V to 5.25 V Normal Mode Power Dissipation 3.5 3.5 mW max VDD = 5 V 2.1 2.1 mW max VDD = 3 V Shutdown Power Dissipation 5 5 μW max VDD = 5 V 3 3 μW max VDD = 3 V Standby Power Dissipation 1.05 1.05 mW max VDD = 5 V 630 630 μW max VDD = 3 V 1 Temperature range for A and B versions is −40°C to +125°C. 2 See the Terminology section. 3 SNR calculation includes distortion and noise components. 4 Sample tested at +25°C to ensure compliance. 5 All digital inputs at GND except CS at VDD. No load on the digital outputs. Analog inputs at GND. 6 SCLK at GND when SCLK off. All digital inputs at GND except for CS at VDD. No load on the digital outputs. Analog inputs at GND. Rev. E | Page 4 of 24 Document Outline Features Applications Functional Block Diagram General Description Product Highlights Table of Contents Revision History Specifications Timing Specifications6F Absolute Maximum Ratings ESD Caution Pin Configurations and Function Descriptions Typical Performance Characteristics Terminology Control Register Theory of Operation Circuit Information Converter Operation ADC Transfer Function Typical Connection Diagram Analog Input On-Chip Reference Power-Down Options Power-Up Times Power vs. Throughput Rate Modes of Operation Mode 1 (PM1 = 0, PM0 = 0) Mode 2 (PM1 = 0, PM0 = 1) Mode 3 (PM1 = 1, PM0 = 0) Mode 4 (PM1 = 1, PM0 = 1) Serial Interface Microprocessor Interfacing AD7887 to TMS320C5x AD7887 to ADSP-21xx AD7887 to DSP56xxx AD7887 to MC68HC11 AD7887 to 8051 AD7887 to PIC16C6x/PIC16C7x Application Hints Grounding and Layout Outline Dimensions Ordering Guide Automotive Products