AD7891(RevA) Ver la hoja de datos (PDF) - Analog Devices
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AD7891 Datasheet PDF : 20 Pages
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AD7891–SPECIFICATIONS (VDD = +5 V ؎ 5%, AGND = DGND = 0 V, REF IN = +2.5 V. All Specifications TMIN to
TMAX unless otherwise noted.)
Parameter
DYNAMIC PERFORMANCE2
A
B
Version1 Version
Signal to (Noise + Distortion) Ratio4
@ +25°C
70
70
TMIN to TMAX
Total Harmonic Distortion4
70
70
–78
–78
Peak Harmonic or Spurious Noise4 –80
–80
Intermodulation Distortion4
2nd Order Terms
–80
–80
3rd Order Terms
–80
–80
Channel-to-Channel Isolation4
–80
–80
Y
Version
70
70
–78
–80
–80
–80
–80
Units
dB min
dB min
dB max
dB max
dB typ
dB typ
dB max
Test Conditions/Comments
Sample Rate = 454.5 kSPS3 (AD7891-1),
500 kSPS3 (AD7891-2). Any Channel
fa = 9 kHz, fb = 9.5 kHz
DC ACCURACY
Resolution
12
Minimum Resolution for Which
No Missing Codes are Guaranteed 12
Relative Accuracy4
±1
Differential Nonlinearity4
±1
Positive Full-Scale Error4
±3
Positive Full-Scale Error Match4, 5 0.6
Unipolar Offset Error
±3
Unipolar Offset Error Match5
0.1
Negative Full-Scale Error4
±3
Negative Full-Scale Error Match4, 5 0.6
Bipolar Zero Error
±4
Bipolar Zero Error Match5
0.2
12
12
12
12
± 0.75
±1
±1
±1
±3
±3
0.6
0.6
±3
±3
0.1
0.1
±3
±3
0.6
0.6
±4
±4
0.2
0.2
Bits
Bits
LSB max
LSB max
LSB max
LSB typ
LSB max
LSB typ
LSB max
LSB typ
LSB max
LSB typ
Any Channel
1.5 LSB max
Input Ranges of 0 V to +2.5␣ V, 0 V to +5␣ V
1 LSB max
Input Ranges of ± 2.5␣ V, ± 5␣ V, ± 10␣ V
1.5 LSB max
Input Ranges of ± 2.5␣ V, ± 5␣ V, ± 10␣ V
1.5 LSB max
ANALOG INPUTS
AD7891-1 Input Voltage Range
AD7891-1 VINXA Input Resistance
AD7891-1 VINXA Input Resistance
AD7891-2 Input Voltage Range
AD7891-2 VINXA Input Resistance
AD7891-2 VINXA Input Current
REFERENCE INPUT/OUTPUT
REF IN Input Voltage Range
Input Impedance
Input Capacitance5
REF OUT Output Voltage
REF OUT Error @ +25°C
TMIN to TMAX
REF OUT Temperature Coefficient
REF OUT Output Impedance
± 5␣
± 5␣
± 5␣
Volts
± 10␣
± 10␣
± 10
Volts
7.5
7.5
7.5
kΩ min
15
15
15
kΩ min
0 to +2.5␣
0 to +5␣
± 2.5␣
1.5
± 50
0 to +2.5␣
0 to +5␣
± 2.5␣
1.5
± 50
0 to +2.5␣ ␣
0 to +5␣
± 2.5␣
1.5
± 50
Volts
Volts
Volts
kΩ min
nA max
2.375/2.625 2.375/2.625 2.375/2.625 V min/V max
1.6
1.6
1.6
kΩ min
10
10
10
pF max
2.5
2.5
2.5
V␣ nom
± 10
± 10
± 10
mV max
± 20
± 20
± 20
mV max
25
25
25
ppm/°C typ
5
5
5
kΩ nom
Input Applied to Both VINXA and VINXB
Input Applied to VINXA, VINXB = AGND
Input Range of ±5␣ V
Input Range of ±10␣ V
Input Applied to Both VINXA and VINXB
Input Applied to VINXA, VINXB = AGND
Input Applied to VINXA, VINXB = REF IN6
Input Ranges of ± 2.5␣ V and 0 to +5␣ V
Input Range of 0 V to +2.5␣ V
2.5 V ± 5%
Resistor Connected to Internal Reference Node
See REF IN Input Impedance
LOGIC INPUTS
Input High Voltage, VINH
Input Low Voltage, VINL
Input Current, IINH
Input Capacitance,5 CIN
2.4
2.4
2.4
V min
VDD = 5 V ± 5%
0.8
0.8
0.8
V max
VDD = 5 V ± 5%
± 10
± 10
± 10
µA max
10
10
10
pF max
–2–
REV. A
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