Datasheet AD7794, AD7795 (Analog Devices) - 2
| Hersteller | Analog Devices |
| Beschreibung | 6-Channel, Low Noise, Low Power, 16-Bit Sigma Delta ADC with On-Chip In-Amp and Reference |
| Seiten / Seite | 36 / 2 — AD7794/AD7795. TABLE OF CONTENTS. REVISION HISTORY. 3/07—Rev. C to Rev. … |
| Revision | D |
| Dateiformat / Größe | PDF / 542 Kb |
| Dokumentensprache | Englisch |
AD7794/AD7795. TABLE OF CONTENTS. REVISION HISTORY. 3/07—Rev. C to Rev. D. 4/05—Rev. 0 to Rev. A. 10/06—Rev. B to Rev. C
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AD7794/AD7795 TABLE OF CONTENTS
Features .. 1 Full-Scale Register.. 25 Applications... 1 ADC Circuit Information.. 26 General Description ... 1 Overview ... 26 Functional Block Diagram .. 1 Digital Interface.. 28 Revision History ... 2 Circuit Description... 31 Specifications... 3 Analog Input Channel ... 31 Timing Characteristics... 8 Instrumentation Amplifier.. 31 Timing Diagrams.. 9 Bipolar/Unipolar Configuration .. 31 Absolute Maximum Ratings.. 10 Data Output Coding .. 32 ESD Caution.. 10 Burnout Currents ... 32 Pin Configuration and Function Descriptions... 11 Excitation Currents .. 32 RMS Noise and Resolution Specifications .. 13 Bias Voltage Generator .. 32 Chop Enabled.. 13 Reference ... 32 Chop Disabled .. 15 Reference Detect... 33 Typical Performance Characteristics ... 16 Reset ... 33 On-Chip Registers .. 17 AVDD Monitor ... 33 Communications Register... 17 Calibration... 33 Status Register ... 18 Grounding and Layout .. 34 Mode Register ... 19 Applications Information .. 35 Configuration Register .. 22 Flowmeter.. 35 Data Register ... 24 Outline Dimensions ... 36 ID Register... 24 Ordering Guide .. 36 IO Register... 24 Offset Register... 25
REVISION HISTORY 3/07—Rev. C to Rev. D 4/05—Rev. 0 to Rev. A
Changes to Specifications Endnote 1... 7 Changes to Absolute Maximum Ratings..9 Changes to Status Register Section .. 18 Changes to Figure 21.. 25 Changes to Ordering Guide .. 36 Changes to Data Output Coding Section.. 28 Changes to Calibration Section .. 30
10/06—Rev. B to Rev. C
Changes to Ordering Guide .. 33 Updated Format..Universal
Added AD7794 C-Grade Part...Universal
10/04—Revision 0: Initial Version
Changes to Specifications .. 3
Changes to Ordering Guide .. 36
6/06—Rev. A to Rev. B
Added AD7795 ...Universal Changes to Features.. 1 Changes to Table 1.. 3 Changes to RMS Noise and Resolution Specifications Section... 12 Changes to Table 19.. 20 Changes to ADC Circuit Information Section ... 25 Changes to Ordering Guide .. 35 Rev. D | Page 2 of 36 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING CHARACTERISTICS TIMING DIAGRAMS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS RMS NOISE AND RESOLUTION SPECIFICATIONS CHOP ENABLED External Reference Internal Reference CHOP DISABLED TYPICAL PERFORMANCE CHARACTERISTICS ON-CHIP REGISTERS COMMUNICATIONS REGISTER RS2, RS1, RS0 = 0, 0, 0 STATUS REGISTER RS2, RS1, RS0 = 0, 0, 0; Power-On/Reset = 0x80 (AD7795)/0x88 (AD7794) MODE REGISTER RS2, RS1, RS0 = 0, 0, 1; Power-On/Reset = 0x000A CONFIGURATION REGISTER RS2, RS1, RS0 = 0, 1, 0; Power-On/Reset = 0x0710 DATA REGISTER RS2, RS1, RS0 = 0, 1, 1; Power-On/Reset = 0x0000(AD7795), 0x000000 (AD7794) ID REGISTER RS2, RS1, RS0 = 1, 0, 0; Power-On/Reset = 0xXF IO REGISTER RS2, RS1, RS0 = 1, 0, 1; Power-On/Reset = 0x00 OFFSET REGISTER RS2, RS1, RS0 = 1, 1, 0; Power-On/Reset = 0x8000 (AD7795), 0x800000 (AD7794)) FULL-SCALE REGISTER RS2, RS1, RS0 = 1, 1, 1; Power-On/Reset = 0x5XXX (AD7795), 0x5XXX00 (AD7794) ADC CIRCUIT INFORMATION OVERVIEW DIGITAL INTERFACE Single Conversion Mode Continuous Conversion Mode Continuous Read CIRCUIT DESCRIPTION ANALOG INPUT CHANNEL INSTRUMENTATION AMPLIFIER BIPOLAR/UNIPOLAR CONFIGURATION DATA OUTPUT CODING BURNOUT CURRENTS EXCITATION CURRENTS BIAS VOLTAGE GENERATOR REFERENCE REFERENCE DETECT RESET AVDD MONITOR CALIBRATION GROUNDING AND LAYOUT APPLICATIONS INFORMATION FLOWMETER OUTLINE DIMENSIONS ORDERING GUIDE
AD7794/AD7795 TABLE OF CONTENTS
Features .. 1 Full-Scale Register.. 25 Applications... 1 ADC Circuit Information.. 26 General Description ... 1 Overview ... 26 Functional Block Diagram .. 1 Digital Interface.. 28 Revision History ... 2 Circuit Description... 31 Specifications... 3 Analog Input Channel ... 31 Timing Characteristics... 8 Instrumentation Amplifier.. 31 Timing Diagrams.. 9 Bipolar/Unipolar Configuration .. 31 Absolute Maximum Ratings.. 10 Data Output Coding .. 32 ESD Caution.. 10 Burnout Currents ... 32 Pin Configuration and Function Descriptions... 11 Excitation Currents .. 32 RMS Noise and Resolution Specifications .. 13 Bias Voltage Generator .. 32 Chop Enabled.. 13 Reference ... 32 Chop Disabled .. 15 Reference Detect... 33 Typical Performance Characteristics ... 16 Reset ... 33 On-Chip Registers .. 17 AVDD Monitor ... 33 Communications Register... 17 Calibration... 33 Status Register ... 18 Grounding and Layout .. 34 Mode Register ... 19 Applications Information .. 35 Configuration Register .. 22 Flowmeter.. 35 Data Register ... 24 Outline Dimensions ... 36 ID Register... 24 Ordering Guide .. 36 IO Register... 24 Offset Register... 25
REVISION HISTORY 3/07—Rev. C to Rev. D 4/05—Rev. 0 to Rev. A
Changes to Specifications Endnote 1... 7 Changes to Absolute Maximum Ratings..9 Changes to Status Register Section .. 18 Changes to Figure 21.. 25 Changes to Ordering Guide .. 36 Changes to Data Output Coding Section.. 28 Changes to Calibration Section .. 30
10/06—Rev. B to Rev. C
Changes to Ordering Guide .. 33 Updated Format..Universal
Added AD7794 C-Grade Part...Universal
10/04—Revision 0: Initial Version
Changes to Specifications .. 3
Changes to Ordering Guide .. 36
6/06—Rev. A to Rev. B
Added AD7795 ...Universal Changes to Features.. 1 Changes to Table 1.. 3 Changes to RMS Noise and Resolution Specifications Section... 12 Changes to Table 19.. 20 Changes to ADC Circuit Information Section ... 25 Changes to Ordering Guide .. 35 Rev. D | Page 2 of 36 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING CHARACTERISTICS TIMING DIAGRAMS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS RMS NOISE AND RESOLUTION SPECIFICATIONS CHOP ENABLED External Reference Internal Reference CHOP DISABLED TYPICAL PERFORMANCE CHARACTERISTICS ON-CHIP REGISTERS COMMUNICATIONS REGISTER RS2, RS1, RS0 = 0, 0, 0 STATUS REGISTER RS2, RS1, RS0 = 0, 0, 0; Power-On/Reset = 0x80 (AD7795)/0x88 (AD7794) MODE REGISTER RS2, RS1, RS0 = 0, 0, 1; Power-On/Reset = 0x000A CONFIGURATION REGISTER RS2, RS1, RS0 = 0, 1, 0; Power-On/Reset = 0x0710 DATA REGISTER RS2, RS1, RS0 = 0, 1, 1; Power-On/Reset = 0x0000(AD7795), 0x000000 (AD7794) ID REGISTER RS2, RS1, RS0 = 1, 0, 0; Power-On/Reset = 0xXF IO REGISTER RS2, RS1, RS0 = 1, 0, 1; Power-On/Reset = 0x00 OFFSET REGISTER RS2, RS1, RS0 = 1, 1, 0; Power-On/Reset = 0x8000 (AD7795), 0x800000 (AD7794)) FULL-SCALE REGISTER RS2, RS1, RS0 = 1, 1, 1; Power-On/Reset = 0x5XXX (AD7795), 0x5XXX00 (AD7794) ADC CIRCUIT INFORMATION OVERVIEW DIGITAL INTERFACE Single Conversion Mode Continuous Conversion Mode Continuous Read CIRCUIT DESCRIPTION ANALOG INPUT CHANNEL INSTRUMENTATION AMPLIFIER BIPOLAR/UNIPOLAR CONFIGURATION DATA OUTPUT CODING BURNOUT CURRENTS EXCITATION CURRENTS BIAS VOLTAGE GENERATOR REFERENCE REFERENCE DETECT RESET AVDD MONITOR CALIBRATION GROUNDING AND LAYOUT APPLICATIONS INFORMATION FLOWMETER OUTLINE DIMENSIONS ORDERING GUIDE