Datasheet AD7709 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | 16-Bit Sigma Delta ADC with Current Sources, Switchable Reference Inputs and I/O Port |
| Pages / Page | 33 / 3 — AD7709. TABLE OF CONTENTS |
| Revision | A |
| File Format / Size | PDF / 442 Kb |
| Document Language | English |
AD7709. TABLE OF CONTENTS
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AD7709 TABLE OF CONTENTS
FEATURES . 1 MICROCOMPUTER/MICROPROCESSOR GENERAL DESCRIPTION . 1 INTERFACING . 20 FUNCTIONAL BLOCK DIAGRAM . 1 AD7709-to-68HC11 Interface . 21 SPECIFICATIONS . 3 AD7709-to-8051 Interface . 21 TIMING CHARACTERISTICS . 6 AD7709-to-ADSP-2103/ADSP-2105 Interface . 21 ABSOLUTE MAXIMUM RATINGS . 8 CIRCUIT DESCRIPTION . 22 ORDERING GUIDE . 8 Analog Input Channels . 22 PIN CONFIGURATION . 8 Programmable Gain Amplifier . 23 PIN FUNCTION DESCRIPTIONS . 9 Bipolar/Unipolar Configuration . 23 TYPICAL PERFORMANCE CHARACTERISTICS . 10 Data Output Coding . 23 ADC CIRCUIT INFORMATION . 11 Excitation Currents . 24 Overview . 11 Crystal Oscillator . 24 S-D ADC . 11 Reference Input . 24 NOISE PERFORMANCE . 13 Reset Input . 24 ON-CHIP REGISTERS . 13 Power-Down Mode . 24 Communications Register . 14 Grounding and Layout . 24 Status Register . 15 APPLICATIONS . 25 Configuration Register . 16 Pressure Measurement . 25 Filter Register . 18 Temperature Measurement . 26 ADC Data Result Register . 18 3-Wire RTD Configurations . 27 CONFIGURING THE AD7709 . 19 Smart Transmitters . 28 DIGITAL INTERFACE . 20 OUTLINE DIMENSIONS . 29 Revision History . 30 –2– REV. A Document Outline FEATURES INTERFACE POWER ON-CHIP FUNCTIONS APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS SPECIFICATIONS TIMING CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDERING GUIDE PIN FUNCTION DESCRIPTIONS Typical Performance Characteristics ADC CIRCUIT INFORMATION Overview Sigma-Delta ADC NOISE PERFORMANCE ON-CHIP REGISTERS Communications Register (A1, A0 = 0, 0) Status Register (A1, A0 = 0, 0; Power-On-Reset = 00H) Configuration Register (A1, A0 = 0, 1; Power-On-Reset = 000007H) Filter Register (A1, A0 = 1, 0; Power-On-Reset = 45h) ADC Data Result Register (A1, A0 = 1, 1; Power-On-Reset = 0000h CONFIGURING THE AD7709 DIGITAL INTERFACE MICROCOMPUTER/MICROPROCESSOR INTERFACING AD7709-to-68HC11 Interface AD7709-to-8051 Interface AD7709-to-ADSP-2103/ADSP-2105 Interface CIRCUIT DESCRIPTION Analog Input Channels Programmable Gain Amplifier Bipolar/Unipolar Configuration Data Output Coding Excitation Currents Crystal Oscillator Reference Input Reset Input Power-Down Mode Grounding and Layout APPLICATIONS Pressure Measurement Temperature Measurement 3-Wire RTD Configurations Smart Transmitters OUTLINE DIMENSIONS Revision History
AD7709 TABLE OF CONTENTS
FEATURES . 1 MICROCOMPUTER/MICROPROCESSOR GENERAL DESCRIPTION . 1 INTERFACING . 20 FUNCTIONAL BLOCK DIAGRAM . 1 AD7709-to-68HC11 Interface . 21 SPECIFICATIONS . 3 AD7709-to-8051 Interface . 21 TIMING CHARACTERISTICS . 6 AD7709-to-ADSP-2103/ADSP-2105 Interface . 21 ABSOLUTE MAXIMUM RATINGS . 8 CIRCUIT DESCRIPTION . 22 ORDERING GUIDE . 8 Analog Input Channels . 22 PIN CONFIGURATION . 8 Programmable Gain Amplifier . 23 PIN FUNCTION DESCRIPTIONS . 9 Bipolar/Unipolar Configuration . 23 TYPICAL PERFORMANCE CHARACTERISTICS . 10 Data Output Coding . 23 ADC CIRCUIT INFORMATION . 11 Excitation Currents . 24 Overview . 11 Crystal Oscillator . 24 S-D ADC . 11 Reference Input . 24 NOISE PERFORMANCE . 13 Reset Input . 24 ON-CHIP REGISTERS . 13 Power-Down Mode . 24 Communications Register . 14 Grounding and Layout . 24 Status Register . 15 APPLICATIONS . 25 Configuration Register . 16 Pressure Measurement . 25 Filter Register . 18 Temperature Measurement . 26 ADC Data Result Register . 18 3-Wire RTD Configurations . 27 CONFIGURING THE AD7709 . 19 Smart Transmitters . 28 DIGITAL INTERFACE . 20 OUTLINE DIMENSIONS . 29 Revision History . 30 –2– REV. A Document Outline FEATURES INTERFACE POWER ON-CHIP FUNCTIONS APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS SPECIFICATIONS TIMING CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDERING GUIDE PIN FUNCTION DESCRIPTIONS Typical Performance Characteristics ADC CIRCUIT INFORMATION Overview Sigma-Delta ADC NOISE PERFORMANCE ON-CHIP REGISTERS Communications Register (A1, A0 = 0, 0) Status Register (A1, A0 = 0, 0; Power-On-Reset = 00H) Configuration Register (A1, A0 = 0, 1; Power-On-Reset = 000007H) Filter Register (A1, A0 = 1, 0; Power-On-Reset = 45h) ADC Data Result Register (A1, A0 = 1, 1; Power-On-Reset = 0000h CONFIGURING THE AD7709 DIGITAL INTERFACE MICROCOMPUTER/MICROPROCESSOR INTERFACING AD7709-to-68HC11 Interface AD7709-to-8051 Interface AD7709-to-ADSP-2103/ADSP-2105 Interface CIRCUIT DESCRIPTION Analog Input Channels Programmable Gain Amplifier Bipolar/Unipolar Configuration Data Output Coding Excitation Currents Crystal Oscillator Reference Input Reset Input Power-Down Mode Grounding and Layout APPLICATIONS Pressure Measurement Temperature Measurement 3-Wire RTD Configurations Smart Transmitters OUTLINE DIMENSIONS Revision History
