Datasheet AD7709 (Analog Devices) - 6

AD7709 Parameter AD7709A, AD7709B Unit Test Conditions
LOGIC OUTPUTS (Excluding XTAL2) VOH, Output High Voltage2 VDD – 0.6 V min VDD = 3 V, ISOURCE = 100 mA VOL, Output Low Voltage2 0.4 V max VDD = 3 V, ISINK = 100 mA VOH, Output High Voltage2 4 V min VDD = 5 V, ISOURCE = 200 mA VOL, Output Low Voltage2 0.4 V max VDD = 5 V, ISINK = 1.6 mA Floating-State Leakage Current ±10 mA max Floating-State Output Capacitance ±10 pF typ Data Output Coding Binary Unipolar Mode Offset Binary Bipolar Mode I/O PORT VINL, Input Low Voltage2 0.8 V max VDD = 5 V 0.4 V max VDD = 3 V VINH, Input High Voltage2 2.0 V min VDD = 3 V or 5 V Input Currents ±2 mA max VIN = VDD –70 mA max VIN = GND, Typically –40 mA @ VDD = 5 V and –20 mA at VDD = 3 V; Weak Pull-Ups on the Logic Inputs Input Capacitance 10 pF typ All Digital Inputs VOH, Output High Voltage2 VDD – 0.6 V min VDD = 3 V, ISOURCE = 100 mA VOL, Output Low Voltage2 0.4 V max VDD = 3 V, ISINK = 100 mA VOH, Output High Voltage2 4 V min VDD = 5 V, ISOURCE = 200 mA VOL, Output Low Voltage2 0.4 V max VDD = 5 V, ISINK = 1.6 mA Floating-State Output Leakage Current ±10 mA max Floating-State Output Capacitance ±10 pF typ START-UP TIME From Power-On 300 ms typ From Standby Mode 1 ms typ OSCPD = 0 From Power-Down Mode 300 ms typ OSCPD = 1 POWER REQUIREMENTS Power Supply Voltage VDD – GND 2.7/3.6 V min/max VDD = 3 V nom 4.75/5.25 V min/max VDD = 5 V nom Power Supply Currents IDD Current 1.5 mA max VDD = 3 V, 1.25 mA typ 1.75 mA max VDD = 5 V, 1.45 mA typ IDD (Low Power Mode) 7 mA max B Grade, VDD = 3 V, Standby Mode 7 mA typ A Grade, VDD = 3 V, Standby Mode 1.5 mA max B Grade, VDD = 3 V, Power-Down Mode 1.5 mA typ A Grade, VDD = 3 V, Power-Down Mode 26 mA max B Grade, VDD = 5 V, Standby Mode 26 mA typ A Grade, VDD = 5 V, Standby Mode 6.5 mA max B Grade, VDD = 5 V, Power-Down Mode 6.5 mA typ A Grade, VDD = 5 V, Power-Down Mode IDD for One Conversion Second 1075 mA typ VDD = 3 V, Standby Mode 1345 mA typ VDD = 5 V, Standby Mode NOTES 1Temperature Range –40∞C to +85∞C. 2Guaranteed by design and/or characterization data on production release. 3Full-scale error applies to both positive and negative full scale. 4Simultaneous 50 Hz and 60 Hz rejection is achieved using 19.79 Hz update rate. Normal mode rejection in this case is 60 dB min. 5When the part is placed in power-down mode for a single conversion/second, at an update rate of 19.79 Hz, the current consumption is higher compared to when the part is placed in standby mode as the crystal oscillator takes approximately 100 ms to begin clocking. The device will, therefore, use full current for the conversion time and the 100 ms period required for the oscillator to begin clocking. However, if the conversion rate is lower, the current consumption will be reduced so that it is worthwhile to use the power-down rather than the standby mode. Specifications subject to change without notice. REV. A –5– 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