Datasheet AD7787 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | Low Power, 2-Channel 24-Bit Sigma-Delta ADC |
| Pages / Page | 21 / 4 — Data Sheet. AD7787. SPECIFICATIONS. Table 1. Parameter. AD7787B. Unit. … |
| Revision | A |
| File Format / Size | PDF / 364 Kb |
| Document Language | English |
Data Sheet. AD7787. SPECIFICATIONS. Table 1. Parameter. AD7787B. Unit. Test Conditions/Comments
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Data Sheet AD7787 SPECIFICATIONS
Temperature range is −40°C to +105°C. VDD = 2.5 V to 5.25 V; REFIN = 2.5 V; GND = 0 V; CDIV1 = CDIV0 = 0; all specifications TMIN to TMAX, unless otherwise noted.
Table 1. Parameter AD7787B Unit Test Conditions/Comments
ADC CHANNEL SPECIFICATION Output Update Rate 9.5 Hz min nom 120 Hz max nom ADC CHANNEL No Missing Codes1 24 Bits min Update rate ≤ 20 Hz. Resolution 19.5 Bits p-p 9.5 Hz update rate. Output Noise 1.1 µV rms typ Integral Nonlinearity ±15 ppm of FSR max 3.5 ppm typ. Offset Error ±3 µV typ Offset Error Drift vs. Temperature ±10 nV/°C typ Full-Scale Error2 ±10 µV typ Gain Drift vs. Temperature ±0.5 ppm/°C typ Power Supply Rejection 90 dB min 100 dB typ, AIN = 1 V. ANALOG INPUTS Bipolar Input Voltage Range ±REFIN V nom Because AIN2 is single-ended, it can have a negative voltage of 100 mV minimum (see Page 18). Unipolar Voltage Range 0 to REFIN V nom Absolute AIN Voltage Limits1 GND + 100 mV V min Buffered mode. VDD – 100 mV V max Analog Input Current Buffered mode. Average Input Current1 ±1 nA max Average Input Current Drift ±5 pA/°C typ Absolute AIN Voltage Limits1, 3 GND – 100 mV V min Unbuffered mode. VDD + 30 mV V max Analog Input Current Unbuffered mode. Current varies with input voltage. Average Input Current ±400 nA/V typ Average Input Current Drift ±50 pA/V/°C typ Normal Mode Rejection1 @ 50 Hz, 60 Hz 65 dB min 73 dB typ, 50 ± 1 Hz, 60 ± 1 Hz, FS[2:0] = 1004. @ 50 Hz 80 dB min 90 dB typ, 50 ± 1 Hz, FS[2:0] = 1014. @ 60 Hz 80 dB min 90 dB typ, 60 ± 1 Hz, FS[2:0] = 0114. Common-Mode Rejection (AIN1) AIN = 1 V. @ DC 90 dB min 100 dB typ. @ 50 Hz, 60 Hz1 100 dB min 50 ± 1 Hz (FS[2:0] = 1014), 60 ± 1 Hz (FS[2:0] = 0114). REFERENCE INPUT REFIN Voltage 2.5 V nom Reference Voltage Range1 0.1 V min VDD V max Average Reference Input Current 0.5 µA/V typ Average Reference Input Current Drift ±0.03 nA/V/°C typ Normal Mode Rejection1 @ 50 Hz, 60 Hz 65 dB min 73 dB typ, 50 ± 1 Hz, 60 ± 1 Hz, FS[2:0] = 1004. @ 50 Hz 80 dB min 90 dB typ, 50 ± 1 Hz, FS[2:0] = 1014. @ 60 Hz 80 dB min 90 dB typ, 60 ± 1 Hz, FS[2:0] = 0114. Rev. A | Page 3 of 20 Document Outline Specifications Timing Characteristics Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics On-Chip Registers Communications Register (RS1, RS0 = 0, 0) Status Register (RS1, RS0 = 0, 0; Power-On/Reset = 0×8C) Mode Register (RS1, RS0 = 0, 1; Power-On/Reset = 0×02) Filter Register (RS1, RS0 = 1, 0; Power-On/Reset = 0×04) Data Register (RS1, RS0 = 1, 1; Power-On/Reset = 0×000000) ADC Circuit Information Overview Noise Performance Reduced Current Modes Digital Interface Single Conversion Mode Continuous Conversion Mode Continuous Read Mode Circuit Description Analog Input Channel Bipolar/Unipolar Configuration Data Output Coding Reference Input VDD Monitor Grounding and Layout Applications Battery Monitoring Outline Dimensions Ordering Guide
Data Sheet AD7787 SPECIFICATIONS
Temperature range is −40°C to +105°C. VDD = 2.5 V to 5.25 V; REFIN = 2.5 V; GND = 0 V; CDIV1 = CDIV0 = 0; all specifications TMIN to TMAX, unless otherwise noted.
Table 1. Parameter AD7787B Unit Test Conditions/Comments
ADC CHANNEL SPECIFICATION Output Update Rate 9.5 Hz min nom 120 Hz max nom ADC CHANNEL No Missing Codes1 24 Bits min Update rate ≤ 20 Hz. Resolution 19.5 Bits p-p 9.5 Hz update rate. Output Noise 1.1 µV rms typ Integral Nonlinearity ±15 ppm of FSR max 3.5 ppm typ. Offset Error ±3 µV typ Offset Error Drift vs. Temperature ±10 nV/°C typ Full-Scale Error2 ±10 µV typ Gain Drift vs. Temperature ±0.5 ppm/°C typ Power Supply Rejection 90 dB min 100 dB typ, AIN = 1 V. ANALOG INPUTS Bipolar Input Voltage Range ±REFIN V nom Because AIN2 is single-ended, it can have a negative voltage of 100 mV minimum (see Page 18). Unipolar Voltage Range 0 to REFIN V nom Absolute AIN Voltage Limits1 GND + 100 mV V min Buffered mode. VDD – 100 mV V max Analog Input Current Buffered mode. Average Input Current1 ±1 nA max Average Input Current Drift ±5 pA/°C typ Absolute AIN Voltage Limits1, 3 GND – 100 mV V min Unbuffered mode. VDD + 30 mV V max Analog Input Current Unbuffered mode. Current varies with input voltage. Average Input Current ±400 nA/V typ Average Input Current Drift ±50 pA/V/°C typ Normal Mode Rejection1 @ 50 Hz, 60 Hz 65 dB min 73 dB typ, 50 ± 1 Hz, 60 ± 1 Hz, FS[2:0] = 1004. @ 50 Hz 80 dB min 90 dB typ, 50 ± 1 Hz, FS[2:0] = 1014. @ 60 Hz 80 dB min 90 dB typ, 60 ± 1 Hz, FS[2:0] = 0114. Common-Mode Rejection (AIN1) AIN = 1 V. @ DC 90 dB min 100 dB typ. @ 50 Hz, 60 Hz1 100 dB min 50 ± 1 Hz (FS[2:0] = 1014), 60 ± 1 Hz (FS[2:0] = 0114). REFERENCE INPUT REFIN Voltage 2.5 V nom Reference Voltage Range1 0.1 V min VDD V max Average Reference Input Current 0.5 µA/V typ Average Reference Input Current Drift ±0.03 nA/V/°C typ Normal Mode Rejection1 @ 50 Hz, 60 Hz 65 dB min 73 dB typ, 50 ± 1 Hz, 60 ± 1 Hz, FS[2:0] = 1004. @ 50 Hz 80 dB min 90 dB typ, 50 ± 1 Hz, FS[2:0] = 1014. @ 60 Hz 80 dB min 90 dB typ, 60 ± 1 Hz, FS[2:0] = 0114. Rev. A | Page 3 of 20 Document Outline Specifications Timing Characteristics Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics On-Chip Registers Communications Register (RS1, RS0 = 0, 0) Status Register (RS1, RS0 = 0, 0; Power-On/Reset = 0×8C) Mode Register (RS1, RS0 = 0, 1; Power-On/Reset = 0×02) Filter Register (RS1, RS0 = 1, 0; Power-On/Reset = 0×04) Data Register (RS1, RS0 = 1, 1; Power-On/Reset = 0×000000) ADC Circuit Information Overview Noise Performance Reduced Current Modes Digital Interface Single Conversion Mode Continuous Conversion Mode Continuous Read Mode Circuit Description Analog Input Channel Bipolar/Unipolar Configuration Data Output Coding Reference Input VDD Monitor Grounding and Layout Applications Battery Monitoring Outline Dimensions Ordering Guide
