AD7890(RevA) Просмотр технического описания (PDF) - Analog Devices
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AD7890 Datasheet PDF : 20 Pages
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AD7890–SPECIFICATIONS (VDD = +5 V, AGND = DGND = 0 V, REF IN = +2.5 V, fCLK IN = 2.5 MHz external,
MUX OUT connect to SHA IN. All specifications TMIN to TMAX unless otherwise noted.)
Parameter
A Versions1 B Versions S Version Units
Test Conditions/Comments
DYNAMIC PERFORMANCE
Signal to (Noise + Distortion) Ratio2 70
Total Harmonic Distortion (THD)2 –78
Peak Harmonic or Spurious Noise2 –79
Intermodulation Distortion
2nd Order Terms
–80
3rd Order Terms
–80
Channel-to-Channel Isolation2
–80
DC ACCURACY
Resolution
12
Minimum Resolution for Which
No Missing Codes Are Guaranteed 12
Relative Accuracy2
±1
Differential Nonlinearity2
±1
Positive Full-Scale Error2
± 2.5
Full-Scale Error Match4
2
AD7890-2, AD7890-4
Unipolar Offset Error2
±2
Unipolar Offset Error Match
2
AD7890-10 Only
Negative Full-Scale Error2
±2
Bipolar Zero Error2
±4
Bipolar Zero Error Match
2
70
70
–78
–78
–79
–79
–80
–80
–80
–80
–80
–80
12
12
12
12
± 0.5
±1
±1
±1
± 2.5
± 2.5
2
2
±2
±2
2
2
±2
±2
±4
±4
2
2
dB min
dB max
dB max
dB typ
dB typ
dB max
Bits
Bits
LSB max
LSB max
LSB max
LSB max
LSB max
LSB max
LSB max
LSB max
LSB max
Using External CONVST. Any Channel
fIN = 10 kHz Sine Wave, fSAMPLE = 100 kHz3
fIN = 10 kHz Sine Wave, fSAMPLE = 100 kHz3
fIN = 10 kHz Sine Wave, fSAMPLE = 100 kHz3
fa = 9 kHz, fb = 9.5 kHz, fSAMPLE = 100 kHz3
fIN = 1 kHz Sine Wave
ANALOG INPUTS
AD7890-10
Input Voltage Range
Input Resistance
AD7890-4
Input Voltage Range
Input Resistance
AD7890-2
Input Voltage Range
Input Current
± 10
± 10
± 10
20
20
20
Volts
kΩ min
0 to +4.096 0 to +4.096 0 to +4.096 Volts
11
11
11
kΩ min
0 to +2.5
50
0 to +2.5
50
0 to +2.5
200
Volts
nA max
MUX OUT OUTPUT
Output Voltage Range
Output Resistance
(AD7890-10, AD7890-4)
(AD7890-2)
SHA IN INPUT
Input Voltage Range
Input Current
0 to +2.5
3/5
2
0 to +2.5
± 50
0 to +2.5
3/5
2
0 to +2.5
± 50
0 to +2.5
3/5
2
0 to +2.5
± 50
Volts
kΩ min/kΩ max
kΩ max
Assuming VIN Is Driven from Low Impedance
Volts
nA max
REFERENCE OUTPUT/INPUT
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
2.375/2.625
1.6
10
2.5
± 10
± 20
25
2
2.375/2.625
1.6
10
2.5
± 10
± 20
25
2
2.375/2.625
1.6
10
2.5
± 10
± 25
25
2
V min/V max
kΩ min
pF max
V nom
mV max
mV max
ppm/°C typ
kΩ nom
2.5 V ± 5%
Resistor Connected to Internal Reference Node
LOGIC INPUTS
Input High Voltage, VINH
Input Low Voltage, VINL
Input Current, IIN
Input Capacitance, CIN5
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
VIN = 0 V to VDD
10
10
10
pF max
–2–
REV. 0
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