Datasheet AD7719 (Analog Devices) - 6

AD7719 Parameter AD7719B Unit Test Conditions
LOGIC INPUTS All Inputs Except SCLK and XTAL12 VINL, Input Low Voltage 0.8 V max DVDD = 5 V 0.4 V max DVDD = 3 V VINH, Input High Voltage 2.0 V min DVDD = 3 V or 5 V SCLK Only (Schmitt-Triggered Input)2 VT(+) 1.4/2 V min/V max DVDD = 5 V VT(–) 0.8/1.4 V min/V max DVDD = 5 V VT(+) – VT(–) 0.3/0.85 V min/V max DVDD = 5 V VT(+) 0.95/2 V min/V max DVDD = 3 V VT(–) 0.4/1.1 V min/V max DVDD = 3 V VT(+) – VT(–) 0.3/0.85 V min/V max DVDD = 3 V XTAL1 Only2 VINL, Input Low Voltage 0.8 V max DVDD = 5 V VINH, Input High Voltage 3.5 V min DVDD = 5 V VINL, Input Low Voltage 0.4 V max DVDD = 3 V VINH, Input High Voltage 2.5 V min DVDD = 3 V Input Currents ±10 µA max VIN = DVDD –70 µA max VIN = DGND, Typically –40 µA at 5 V and –20 µA at 3 V Input Capacitance2 10 pF typ All Digital Inputs LOGIC OUTPUTS (Excluding XTAL2) VOH, Output High Voltage2 DVDD – 0.6 V min DVDD = 3 V, ISOURCE = 100 µA VOL, Output Low Voltage2 0.4 V max DVDD = 3 V, ISINK = 100 µA VOH, Output High Voltage2 4 V min DVDD = 5 V, ISOURCE = 200 µA VOL, Output Low Voltage 2 0.4 V max DVDD = 5 V, ISINK = 1.6 mA Floating-State Leakage Current ±10 µA max Floating-State Output Capacitance ±10 pF typ Data Output Coding Binary Unipolar Mode Offset Binary Bipolar Mode I/O PORT11 I/O Port Voltages Are with Respect to AVDD and AGND VINL, Input Low Voltage2 0.8 V max AVDD = 5 V 0.4 V max AVDD = 3 V VINH, Input High Voltage2 2.0 V min AVDD = 3 V or 5 V Input Currents ±10 µA max VIN = AVDD –70 µA max VIN = AGND, Typically –40 µA at AVDD = 5 V and –20 µA at AVDD = 3 V Input Capacitance 10 pF typ All Digital Inputs VOH, Output High Voltage2 AVDD – 0.6 V min AVDD = 3 V, ISOURCE = 100 µA VOL, Output Low Voltage2 0.4 V max AVDD = 3 V, ISINK = 100 µA VOH, Output High Voltage2 4 V min AVDD = 5 V, ISOURCE = 200 µA VOL, Output Low Voltage2 0.4 V max AVDD = 5 V, ISINK = 1.6 mA Floating-State Output Leakage Current ±10 µA max Floating-State Output Capacitance ±10 pF typ START-UP TIME From Power-On 300 ms typ From Idle Mode 1 ms typ From Power-Down Mode 1 ms typ Osc. Active in Power-Down 300 ms typ Osc. Powered Down POWER REQUIREMENTS Power Supply Voltages AVDD – AGND 2.7/3.6 V min/max AVDD = 3 V nom 4.75/5.25 V min/max AVDD = 5 V nom DVDD – DGND 2.7/3.6 V min/max DVDD = 3 V nom 4.75/5.25 V min DVDD = 5 V nom Power Supply Currents DIDD Current (Normal Mode)12 0.6 mA max DVDD = 3 V, 0.5 mA typ 0.75 mA max DVDD = 5 V, 0.6 mA typ REV. A –5– Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ORDERING GUIDE TIMING CHARACTERISTICS DIGITAL INTERFACE PIN CONFIGURATION PIN FUNCTION DESCRIPTIONS Typical Performance Characteristics DUAL-CHANNEL ADC CIRCUIT INFORMATION Overview Main Channel Auxiliary Channel Both Channels MAIN AND AUXILIARY ADC NOISE PERFORMANCE ON-CHIP REGISTERS Communications Register (A3, A2, A1, A0 = 0, 0, 2, 0) Status Register (A3, A2, A1, A0 = 0, 0, 0, 0; Power-On Reset = 0x00) Mode Register (A3, A2, A1, A0 = 0, 0, 0, 1; Power-On Reset = 0x00) Operating Characteristics when Addressing the Mode and Control Registers Main ADC Control Register (AD0CON): (A3, A2, A1, A0 = 0, 0, 1, 0; Power-On Reset = 0x07) Aux ADC Control Registers (AD1CON): (A3, A2, A1, A0 = 0, 0, 1, 1; Power-On Reset = 0x00) Filter Register (A3, A2, A1, A0 = 0, 1, 0, 0; Power-On Reset = 0x45) I/O and Current Source Control Register (IOCON): (A3, A2, A1, A0 = 0, 1, 1, 1; Power-On Reset = 0x0000) Main ADC Data Result Registers (DATA0): (A3, A2, A1, A0 = 0, 1, 0, 1; Power-On Reset = 0x00 0000) Aux ADC Data Result Registers (DATA1): (A3, A2, A1, A0 = 0, 1, 1, 0; Power-On Reset = 0x0000) Main ADC Offset Calibration Coefficient Registers (OF0): (A3, A2, A1, A0 = 1, 0, 0, 0; Power-On Reset = 0x80 0000) Aux ADC Offset Calibration Coefficient Registers (OF1): (A3, A2, A1, A0 = 1, 0, 0, 1; Power-On Reset = 0x8000) Main ADC Gain Calibration Coefficient Registers (GNO): (A3, A2, A1, A0 = 1, 0, 1, 0; Power-On Reset = 0x5X XXX5) Aux ADC Gain Calibration Coefficient Registers (GN1): (A3, A2, A1, A0 = 1, 0, 1, 1; Power-On Reset = 0x59XX) ID Register (ID): (A3, A2, A1, A0 = 1, 1, 1, 1; Power-On Reset = 0x0X) User Nonprogrammable Test Registers CONFIGURING THE AD7719 MICROCOMPUTER/MICROPROCESSOR INTERFACING AD7719-to-68HC11 Interface AD7719-to-8xC51 Interface AD7719-to-ADSP-2103/ADSP-2105 Interface CIRCUIT DESCRIPTION Analog Input Channels Programmable Gain Amplifier Bipolar/Unipolar Configuration Data Output Coding Burnout Currents Excitation Currents Crystal Oscillator Reference Input Reference Detect Reset Input Power-Down Mode Idle Mode ADC Disable Mode Calibration Grounding and Layout APPLICATIONS Pressure Measurement Temperature Measurement 3-Wire RTD Configurations Smart Transmitters OUTLINE DIMENSIONS Revision History