Datasheet AD7294-2 (Analog Devices) - 6

link to page 16 link to page 15 link to page 20 link to page 6 link to page 6 link to page 6 link to page 6 link to page 6 link to page 6 link to page 6 link to page 6 link to page 6 link to page 6
AD7294-2 Data Sheet Parameter Min Typ Max Unit Test Conditions/Comments
TEMPERATURE SENSOR—INTERNAL Operating Range −40 +105 °C Accuracy ±2 °C Internal temperature sensor, TA = −30°C to +90°C ±2.5 °C Internal temperature sensor, TA = −40°C to +105°C Resolution 0.25 °C LSB size Update Rate 5 ms TEMPERATURE SENSOR—EXTERNAL External transistor is 2N3906 Operating Range −55 +150 °C Limited by external diode Accuracy ±2 °C TA = TDIODE = −40°C to +105°C Resolution 0.25 °C LSB size Low Level Output Current Source2 8 µA Medium Level Output Current Source2 32 µA High Level Output Current Source2 128 µA Maximum Series Resistance (RS) for 10 kΩ For <±0.5°C additional error, CP = 0 (see Figure 29) External Diode2 Maximum Parallel Capacitance (CP) for 1 nF RS = 0 (see Figure 28) External Diode2 CURRENT SENSE VPP = AVDD to 59.4 V VPP Supply Range AVDD 59.4 V Gain Error ±0.75 % FSR 2.5 V reference Differential Input ±200 mV 2.5 V reference RS(+)/RS(−) Input Bias Current 25 32 µA CMRR/PSRR2 110 dB Inputs shorted to VPP Offset Error ±50 ±780 µV Offset Drift 3 µV/°C Amplifier Peak-to-Peak Noise2 400 µV Referred to input VPP Supply Current 0.18 0.25 mA Per channel, VPP1 = VPP2 = 59.4 V REFERENCE Reference Output Voltage 2.49 2.5 2.51 V ±0.2% maximum at 25°C Reference Input Voltage Range2 0.1 4.1 V DC Leakage Current ±2 μA VREF Output Impedance2 5 Ω A buffer is required if the reference output is used to drive external loads Input Capacitance2 20 pF Reference Temperature Coefficient 10 25 ppm/°C 1 See the Terminology section for more information. 2 Guaranteed by design and characterization; not production tested. 3 VIN+ and VIN− must remain within AGND/AVDD. (The analog input pins are VIN3 to VIN0.) 4 VIN− = 0 V for specified performance. For full input range on VIN−, see Figure 36. Rev. 0 | Page 6 of 44 Document Outline Features Applications General Description Table of Contents Revision History Functional Block Diagram Specifications DAC Specifications ADC Specifications General Specifications Timing Characteristics I2C Serial Interface Timing and Circuit Diagrams Absolute Maximum Ratings Thermal Resistance ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Terminology DAC Terminology ADC Terminology Theory of Operation ADC Overview ADC Transfer Functions Analog Inputs Single-Ended Mode Differential Mode Driving Differential Inputs Using an Op Amp Pair Pseudo Differential Mode Current Sensor Choosing RSENSE Current Sense Filtering Kelvin Sense Resistor Connection Analog Comparator Loop Temperature Sensor Remote Sensing Diode Ideality Factor Base Emitter Voltage hFE Variation Series Resistance Cancellation DAC Operation Resistor String Output Amplifiers ADC and DAC Reference VDRIVE Feature Register Settings Address Pointer Register Command Register ADC Result Register ADC Channel Allocation TSENSE1 and TSENSE2 Result Registers TSENSEINT Result Register Temperature Value Format DACA, DACB, DACC, and DACD Value Registers Alert Status Register A, Alert Status Register B, and Alert Status Register C Channel Sequence Register Configuration Register Sample Delay and Bit Trial Delay Power-Down Register DATALOW and DATAHIGH Registers VIN0 to VIN3 Channels TSENSE1, TSENSE2, and TSENSEINT Channels Hysteresis Registers Remote Channel TSENSE1 and TSENSE2 Offset Registers I2C Interface General I2C Timing Serial Bus Address Byte Interface Protocol Writing a Single Byte of Data to an 8-Bit Register Writing Two Bytes of Data to a 16-Bit Register Writing to Multiple Registers Reading Data from an 8-Bit Register Reading Two Bytes of Data from a 16-Bit Register Modes of Operation Command Mode Autocycle Mode Alerts and Limits Theory ALERT_FLAG Bit Alert Status Registers DATALOW and DATAHIGH Monitoring Features Hysteresis Using the Limit Registers to Store Minimum/Maximum Conversion Results Applications Information Base Station Power Amplifier Monitor and Control Gain Control of Power Amplifier Outline Dimensions Ordering Guide