Datasheet AD7625 (Analog Devices) - 9
| Manufacturer | Analog Devices |
| Description | 16-Bit, 6MSPS PulSAR Differential ADC |
| Pages / Page | 25 / 9 — AD7625. Data Sheet. Pin No. Mnemonic. Type1 Description |
| Revision | B |
| File Format / Size | PDF / 1.0 Mb |
| Document Language | English |
AD7625. Data Sheet. Pin No. Mnemonic. Type1 Description
Model Line for this Datasheet
Text Version of Document
link to page 22
AD7625 Data Sheet Pin No. Mnemonic Type1 Description
25, 26, 28 CAP2 AO Connect all three CAP2 pins together and decouple them with the shortest trace possible to a single 10 μF, low ESR, low ESL capacitor. The other side of the capacitor must be placed close to Pin 27 (GND). 27 GND P Ground. Return path for the 10 μF capacitor connected to Pin 25, Pin 26, and Pin 28. 29, 30, 32 REF AI/O Buffered Reference Voltage. When using the internal reference or the 1.2 V external reference (REFIN input), the 4.096 V system reference is produced at this pin. When using an external reference, such as the ADR434 or the ADR444, the internal reference buffer must be disabled. In either case, connect all three REF pins together and decouple them with the shortest trace possible to a single 10 μF, low ESR, low ESL capacitor. The other side of the capacitor must be placed close to Pin 31 (GND). 31 GND P Ground. Return path for the 10 μF capacitor connected to Pin 29, Pin 30, and Pin 32. EP Exposed Pad The exposed pad is located on the underside of the package. Connect the exposed pad to the ground plane of the PCB using multiple vias. See the Exposed Pad section for more information. 1 AI = analog input; AI/O = bidirectional analog; AO = analog output; DI = digital input; DO = digital output; P = power. Rev. B | Page 8 of 24 Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TERMINOLOGY THEORY OF OPERATION CIRCUIT INFORMATION CONVERTER INFORMATION TRANSFER FUNCTIONS ANALOG INPUTS TYPICAL CONNECTION DIAGRAM DRIVING THE AD7625 Differential Analog Input Source Single-Ended-to-Differential Driver VOLTAGE REFERENCE OPTIONS POWER SUPPLY Power-Up DIGITAL INTERFACE Conversion Control Echoed-Clock Interface Mode Self-Clocked Interface Mode APPLICATIONS INFORMATION LAYOUT, DECOUPLING, AND GROUNDING Exposed Pad VDD1 Supply Routing and Decoupling VIO Supply Decoupling Layout and Decoupling of Pin 25 to Pin 32 OUTLINE DIMENSIONS ORDERING GUIDE NOTES NOTES
AD7625 Data Sheet Pin No. Mnemonic Type1 Description
25, 26, 28 CAP2 AO Connect all three CAP2 pins together and decouple them with the shortest trace possible to a single 10 μF, low ESR, low ESL capacitor. The other side of the capacitor must be placed close to Pin 27 (GND). 27 GND P Ground. Return path for the 10 μF capacitor connected to Pin 25, Pin 26, and Pin 28. 29, 30, 32 REF AI/O Buffered Reference Voltage. When using the internal reference or the 1.2 V external reference (REFIN input), the 4.096 V system reference is produced at this pin. When using an external reference, such as the ADR434 or the ADR444, the internal reference buffer must be disabled. In either case, connect all three REF pins together and decouple them with the shortest trace possible to a single 10 μF, low ESR, low ESL capacitor. The other side of the capacitor must be placed close to Pin 31 (GND). 31 GND P Ground. Return path for the 10 μF capacitor connected to Pin 29, Pin 30, and Pin 32. EP Exposed Pad The exposed pad is located on the underside of the package. Connect the exposed pad to the ground plane of the PCB using multiple vias. See the Exposed Pad section for more information. 1 AI = analog input; AI/O = bidirectional analog; AO = analog output; DI = digital input; DO = digital output; P = power. Rev. B | Page 8 of 24 Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TERMINOLOGY THEORY OF OPERATION CIRCUIT INFORMATION CONVERTER INFORMATION TRANSFER FUNCTIONS ANALOG INPUTS TYPICAL CONNECTION DIAGRAM DRIVING THE AD7625 Differential Analog Input Source Single-Ended-to-Differential Driver VOLTAGE REFERENCE OPTIONS POWER SUPPLY Power-Up DIGITAL INTERFACE Conversion Control Echoed-Clock Interface Mode Self-Clocked Interface Mode APPLICATIONS INFORMATION LAYOUT, DECOUPLING, AND GROUNDING Exposed Pad VDD1 Supply Routing and Decoupling VIO Supply Decoupling Layout and Decoupling of Pin 25 to Pin 32 OUTLINE DIMENSIONS ORDERING GUIDE NOTES NOTES
