Datasheet AD7858, AD7858L (Analog Devices) - 2

AD7858/AD7858L–SPECIFICATIONS1, 2 (AVDD = DVDD = +3.0 V to +5.5 V, REFIN/REFOUT = 2.5 V External Reference unless otherwise noted, fCLKIN = 4 MHz (1.8 MHz B Grade (0
ⴗ
C to +70
ⴗ
C), 1 MHz A and B Grades (–40
ⴗ
C to +85
ⴗ
C) for L Version); fSAMPLE = 200 kHz (AD7858), 100 kHz (AD7858L); SLEEP = Logic High; TA = TMIN to TMAX, unless otherwise noted.) Specifications in ( ) apply to the AD7858L. Parameter A Version1 B Version1 Units Test Conditions/Comments
DYNAMIC PERFORMANCE Signal to Noise + Distortion Ratio3 70 71 dB min Typically SNR is 72 dB (SNR) VIN = 10 kHz Sine Wave, fSAMPLE = 200 kHz (100 kHz) Total Harmonic Distortion (THD) –78 –78 dB max VIN = 10 kHz Sine Wave, fSAMPLE = 200 kHz (100 kHz) Peak Harmonic or Spurious Noise –78 –78 dB max VIN = 10 kHz Sine Wave, fSAMPLE = 200 kHz (100 kHz) Intermodulation Distortion (IMD) Second Order Terms –78 –80 dB typ fa = 9.983 kHz, fb = 10.05 kHz, fSAMPLE = 200 kHz (100 kHz) Third Order Terms –78 –80 dB typ fa = 9.983 kHz, fb = 10.05 kHz, fSAMPLE = 200 kHz (100 kHz) Channel-to-Channel Isolation –90 –90 dB typ VIN = 25 kHz DC ACCURACY Any Channel Resolution 12 12 Bits Integral Nonlinearity ±1 ±1 LSB max 2.5 V External Reference VDD = 3 V, VDD = 5 V (B Grade Only) ±1 ±0.5 LSB max 5 V External Reference VDD = 5 V (±1) LSB max (L Version, 5 V External Reference, VDD = 5 V) (±1) LSB max (L Version) Differential Nonlinearity ±1 ±1 LSB max Guaranteed No Missed Codes to 12 Bits. 2.5 V External Reference VDD = 3 V, 5 V External Reference, VDD = 5 V Total Unadjusted Error ±1 ±1 LSB typ Unipolar Offset Error ±5 ±5 LSB max Typically ± 2 LSBs ±2.5 ±2.5 LSB max 5 V External Reference, VDD = 5 V (± 3) (± 3) LSB max (L Version) (± 1.5) (± 1.5) LSB max (L Version, 5 V External Reference, VDD = 5 V) Unipolar Offset Error Match 1.5 1.5 LSB max Positive Full-Scale Error ±4 ±4 LSB max ±1.5 ±1.5 LSB max 5 V External Reference, VDD = 5 V Positive Full-Scale Error Match 1 1 LSB max ANALOG INPUT Input Voltage Ranges 0 to VREF 0 to VREF Volts i.e., AIN(+) – AIN(–) = 0 to VREF, AIN(–) can be biased up but AIN(+) cannot go below AIN(–) Leakage Current ±1 ±1 µA max Input Capacitance 20 20 pF typ REFERENCE INPUT/OUTPUT REFIN Input Voltage Range 2.3/VDD 2.3/VDD V min/max Functional from 1.2 V Input Impedance 150 150 kΩ typ REFOUT Output Voltage 2.3/2.7 2.3/2.7 V min/max REFOUT Tempco 20 20 ppm/°C typ LOGIC INPUTS Input High Voltage, VINH 2.4 2.4 V min AVDD = DVDD = 4.5 V to 5.5 V 2.1 2.1 V min AVDD = DVDD = 3.0 V to 3.6 V Input Low Voltage, VINL 0.8 0.8 V max AVDD = DVDD = 4.5 V to 5.5 V 0.6 0.6 V max AVDD = DVDD = 3.0 V to 3.6 V Input Current, IIN ±10 ±10 µA max Typically 10 nA, VIN = 0 V or VDD Input Capacitance, C 4 IN 10 10 pF max LOGIC OUTPUTS Output High Voltage, VOH ISOURCE = 200 µA 4 4 V min AVDD = DVDD = 4.5 V to 5.5 V 2.4 2.4 V min AVDD = DVDD = 3.0 V to 3.6 V Output Low Voltage, VOL 0.4 0.4 V max ISINK = 0.8 mA Floating-State Leakage Current ±10 ±10 µA max Floating-State Output Capacitance4 10 10 pF max Output Coding Straight (Natural) Binary CONVERSION RATE Conversion Time 4.6 (18) 4.6 µs max (L Versions Only, –40°C to +85°C, 1 MHz CLKIN) (10) µs max (L Versions Only, 0°C to +70°C, 1.8 MHz CLKIN) Track/Hold Acquisition Time 0.4 (1) 0.4 (1) µs min (L Versions Only) –2– REV. B