Datasheet AD7895 (Analog Devices) - 3

AD7895–SPECIFICATIONS (VDD = +5 V, GND = 0 V, REF IN = +2.5 V. All specifications TMIN to TMAX unless otherwise noted) Parameter A Versionsl B Versions Units Test Conditions/Comments
DYNAMIC PERFORMANCE2 Signal to (Noise + Distortion) Ratio3 @ +25°C 70 70 dB min fIN = 50 kHz Sine Wave, fSAMPLE = 200 kHz TMIN to TMAX 70 70 dB min Total Harmonic Distortion (THD)3 –78 –78 dB max fIN = 50 kHz Sine Wave, fSAMPLE = 200 kHz, Typically –87 dB Peak Harmonic or Spurious Noise3 –89 –89 dB typ fIN = 50 kHz Sine Wave, fSAMPLE = 200 kHz Intermodulation Distortion (IMD)3 fa = 9 kHz, fb = 9.5 kHz, fSAMPLE = 200 kHz 2nd Order Terms –87 –87 dB typ 3rd Order Terms –87 –87 dB typ DC ACCURACY Resolution 12 12 Bits Minimum Resolution for which No Missing Codes are Guaranteed 12 12 Bits Relative Accuracy3 ±1 ±1 LSB max Typically 0.4 LSB Differential Nonlinearity3 ±1 ±1 LSB max Positive Full-Scale Error3 ±3 ±2 LSB max AD7895-2 Unipolar Offset Error ±3 ±2 LSB max AD7895-10, AD7895-3 Only Negative Full-Scale Error3 ±3 ±2 LSB max Bipolar Zero Error ±4 ±3 LSB max ANALOG INPUT AD7895-10 Input Voltage Range ±10 ±10 Volts Input Resistance 24 24 kΩ min AD7895-3 Input Voltage Range ±2.5 ±2.5 Volts Input Resistance 9 9 kΩ min AD7895-2 Input Voltage Range 0 to +2.5 0 to +2.5 Volts Input Current 500 500 nA max REFERENCE INPUT REF IN Input Voltage Range 2.375/2.625 2.375/2.625 V min/V max 2.5 V ± 5% Input Current 1 1 µA max Input Capacitance3 10 10 pF max LOGIC INPUTS Input High Voltage, VINH 2.4 2.4 V min VDD = 5 V ± 5% Input Low Voltage, VINL 0.8 0.8 V max VDD = 5 V ± 5% Input Current, I ± IN 10 ±10 µA max VIN = 0 V to VDD Input Capacitance, C 4 IN 10 10 pF ax LOGIC OUTPUTS Output High Voltage, VOH 4.0 4.0 V min ISOURCE = 200 µA Output Low Voltage, VOL 0.4 0.4 V max ISINK = 1.6 mA Output Coding AD7895-10, AD7895-3 2s Complement AD7895-2 Straight (Natural) Binary CONVERSION RATE Conversion Time Mode 1 Operation 3.8 3.8 µs max Mode 2 Operation5 9.8 9.8 µs max Track/Hold Acquisition Time3 0.5 0.5 µs max POWER REQUIREMENTS VDD +5 +5 V nom ±5% for Specified Performance IDD 4 4 mA max Digital Inputs @ VDD, VDD = 5 V ± 5% Power Dissipation 20 20 mW max Typically 16 mW Power-Down Mode IDD @ +25°C 5 5 µA max Digital Inputs @ GND, VDD = 5 V ± 5% TMIN to TMAX 10 10 µA max Digital Inputs @ GND, VDD = 5 V ± 5% Power Dissipation @ +25°C 25 25 µW max NOTES 1Temperature ranges are as follows: A, B Versions: –40°C to +85°C. 2Applies to Mode 1 operation. See section on “Operating Modes.” 3See Terminology. 4Sample tested @ +25°C to ensure compliance. 5This 9.8 µs includes the “wake-up” time from standby. This “wake-up” time is timed from the rising edge of CONVST, whereas conversion is timed from the falling edge of CONVST, for narrow CONVST pulse width the conversion time is effectively the “wake-up” time plus conversion time hence 9.8 µs. This can be seen from Figure 3. Note that if the CONVST pulse width is greater than 6 µs then the effective conversion time will increase beyond 9.8 µs. Specifications subject to change without notice. –2– REV. 0