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AD7891 Datasheet(PDF) 2 Page - Analog Devices

Part No. AD7891
Description  LC2MOS 8-Channel, 12-Bit High Speed Data Acquisition System
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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–2–
REV. A
AD7891–SPECIFICATIONS
(VDD = +5 V
5%, AGND = DGND = 0 V, REF IN = +2.5 V. All Specifications TMIN to
TMAX unless otherwise noted.)
ABY
Parameter
Version
1
Version
Version
Units
Test Conditions/Comments
DYNAMIC PERFORMANCE
2
Sample Rate = 454.5 kSPS
3 (AD7891-1),
500 kSPS
3 (AD7891-2). Any Channel
Signal to (Noise + Distortion) Ratio
4
@ +25
°C
707070dB min
TMIN to TMAX
70
70
70
dB min
Total Harmonic Distortion
4
–78
–78
–78
dB max
Peak Harmonic or Spurious Noise
4
–80
–80
–80
dB max
Intermodulation Distortion
4
fa = 9 kHz, fb = 9.5 kHz
2nd Order Terms
–80
–80
–80
dB typ
3rd Order Terms
–80
–80
–80
dB typ
Channel-to-Channel Isolation
4
–80
–80
–80
dB max
DC ACCURACY
Any Channel
Resolution
12
12
12
Bits
Minimum Resolution for Which
No Missing Codes are Guaranteed
12
12
12
Bits
Relative Accuracy4
± 1
± 0.75
± 1
LSB max
Differential Nonlinearity4
± 1
± 1
± 1
LSB max
Positive Full-Scale Error4
± 3
± 3
± 3
LSB max
Positive Full-Scale Error Match4, 5
0.6
0.6
0.6
LSB typ
1.5 LSB max
Unipolar Offset Error
± 3
± 3
± 3
LSB max
Input Ranges of 0 V to +2.5 V, 0 V to +5 V
Unipolar Offset Error Match5
0.1
0.1
0.1
LSB typ
1 LSB max
Negative Full-Scale Error4
± 3
± 3
± 3
LSB max
Input Ranges of
± 2.5 V, ± 5 V, ± 10 V
Negative Full-Scale Error Match4, 5
0.6
0.6
0.6
LSB typ
1.5 LSB max
Bipolar Zero Error
± 4
± 4
± 4
LSB max
Input Ranges of
± 2.5 V, ± 5 V, ± 10 V
Bipolar Zero Error Match5
0.2
0.2
0.2
LSB typ
1.5 LSB max
ANALOG INPUTS
AD7891-1 Input Voltage Range
± 5
± 5
± 5
Volts
Input Applied to Both VINXA and VINXB
± 10
± 10
± 10
Volts
Input Applied to VINXA, VINXB = AGND
AD7891-1 VINXA Input Resistance
7.5
7.5
7.5
k
Ω min
Input Range of
±5 V
AD7891-1 VINXA Input Resistance
15
15
15
k
Ω min
Input Range of
±10 V
AD7891-2 Input Voltage Range
0 to +2.5
0 to +2.5
0 to +2.5
Volts
Input Applied to Both VINXA and VINXB
0 to +5
0 to +5
0 to +5
Volts
Input Applied to VINXA, VINXB = AGND
± 2.5
± 2.5
± 2.5
Volts
Input Applied to VINXA, VINXB = REF IN
6
AD7891-2 VINXA Input Resistance
1.5
1.5
1.5
k
Ω min
Input Ranges of
± 2.5 V and 0 to +5 V
AD7891-2 VINXA Input Current
± 50
± 50
± 50
nA max
Input Range of 0 V to +2.5 V
REFERENCE INPUT/OUTPUT
REF IN Input Voltage Range
2.375/2.625 2.375/2.625 2.375/2.625 V min/V max
2.5 V
± 5%
Input Impedance
1.6
1.6
1.6
k
Ω min
Resistor Connected to Internal Reference Node
Input Capacitance
5
10
10
10
pF max
REF OUT Output Voltage
2.5
2.5
2.5
V nom
REF OUT Error @ +25
°C
± 10
± 10
± 10
mV max
TMIN to TMAX
± 20
± 20
± 20
mV max
REF OUT Temperature Coefficient
25
25
25
ppm/
°C typ
REF OUT Output Impedance
5
5
5
k
Ω nom
See REF IN Input Impedance
LOGIC INPUTS
Input High Voltage, VINH
2.4
2.4
2.4
V min
VDD = 5 V
± 5%
Input Low Voltage, VINL
0.8
0.8
0.8
V max
VDD = 5 V
± 5%
Input Current, IINH
± 10
± 10
± 10
µA max
Input Capacitance,
5 CIN
10
10
10
pF max




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