Datasheet AD7708, AD7718 (Analog Devices) - 8

AD7718–SPECIFICA AD7708 TIONS1 (AVDD = 2.7 V to 3.6 V or 4.75 V to 5.25 V, DVDD = 2.7 V to 3.6 V or 4.75 V to 5.25 V, REFIN(+) = 2.5 V ; REFIN(–) = AGND; AGND = DGND = 0 V; XTAL1/XTAL2 = 32.768 kHz Crystal Input Buffer Enabled. All specifications TMIN to TMAX unless otherwise noted.) Parameter B Grade Unit Test Conditions
LOGIC INPUTS (Continued) 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 Logic Input = DVDD –70 µA max Logic Input = DGND, Typical –40 µA @ 5 V and –20 µA at 3 V Input Capacitance 10 pF typ All Digital Inputs LOGIC OUTPUTS (Excluding XTAL2)5 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 Voltage2 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 SYSTEM CALIBRATION2 Full-Scale Calibration Limit 1.05 × FS V max Zero-Scale Calibration Limit –1.05 × FS V min Input Span 0.8 × FS V min 2.1 × FS V max START-UP TIME From Power-On 300 ms typ From Power-Down Mode 1 ms typ 300 ms typ Oscillator Powered Down POWER REQUIREMENTS Power Supply Voltages AVDD and DVDD can be operated independently of each other. 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 DIDD (Normal Mode) 0.55 mA max DVDD = 3 V, 0.43 mA typ 0.65 mA DVDD = 5 V, 0.5 mA typ AIDD (Normal Mode) 1.1 mA AVDD = 3 V or 5 V, 0.85 mA typ DIDD (Power-Down Mode) 10 µA max DVDD = 3 V, 32.768 kHz Osc. Running 2 µA max DVDD = 3 V, Oscillator Powered Down 30 µA max DVDD = 5 V, 32.768 kHz Osc. Running 8 µA max DVDD = 5 V, Oscillator Powered Down AIDD (Power-Down Mode) 1 µA max AVDD = 3 V or 5 V Power Supply Rejection (PSR) Input Range = ± 2.56 V, AIN = 1 V Chop Disabled 70 dB min 95 dB typ Chop Enabled 100 dB typ NOTES 1Temperature range is –40°C to +85°C. 2Not production tested, guaranteed by design and/or characterization data at release. 3Following a self-calibration this error will be in the order of the noise for the programmed gain and update selected. A system calibration will completely remove this error. 4Recalibration at any temperature will remove these errors. 5I/O Port Logic Levels are with respect to AVDD and AGND. Specifications are subject to change without notice. –8– REV. 0