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AD7887AR Datasheet(PDF) 2 Page - Analog Devices

No. de pieza AD7887AR
Descripción Electrónicos  2.7 V to 5.25 V, Micropower, 2-Channel, 125 kSPS, 12-Bit ADC in 8-Lead uSOIC
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
Logo AD - Analog Devices

AD7887AR Datasheet(HTML) 2 Page - Analog Devices

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REV. B
–2–
AD7887–SPECIFICATIONS1
(VDD = +2.7 V to +5.25 V, VREF = +2.5 V External/Internal Reference unless otherwise
noted, fSCLK = 2 MHz; TA = TMIN to TMAX, unless otherwise noted.)
Parameter
A Version
1
B Version
1
Units
Test Conditions/Comments
DYNAMIC PERFORMANCE
Signal to Noise + Distortion
Ratio
2, 3 (SNR)
71
71
dB typ
fIN = 10 kHz Sine Wave, fSAMPLE = 125 kSPS
Total Harmonic Distortion
2 (THD)
–80
–80
dB typ
fIN = 10 kHz Sine Wave, fSAMPLE = 125 kSPS
Peak Harmonic or Spurious Noise
2
–80
–80
dB typ
fIN = 10 kHz Sine Wave, fSAMPLE = 125 kSPS
Intermodulation Distortion
2 (IMD)
Second Order Terms
–80
–80
dB typ
fa = 9.983 kHz, fb = 10.05 kHz, fSAMPLE = 125 kSPS
Third Order Terms
–80
–80
dB typ
fa = 9.983 kHz, fb = 10.05 kHz, fSAMPLE = 125 kSPS
Channel-to-Channel Isolation
2
–80
–80
dB typ
fIN = 25 kHz
Full Power Bandwidth
2.5
2.5
MHz typ
@ 3 dB
DC ACCURACY
Any Channel
Resolution
12
12
Bits
Integral Nonlinearity
2
±2
± 1
LSB max
Differential Nonlinearity
2
±2
± 1
LSB max
Guaranteed No Missing Codes to 11 Bits (A Grade)
Offset Error
2
±3
± 3
LSB max
VDD = 5 V, Dual-Channel Mode
±4
± 4
LSB max
VDD = 3 V, Dual-Channel Mode
±6
± 6
LSB typ
Single-Channel Mode
Offset Error Match
2
0.5
0.5
LSB max
Gain Error
2
±2
± 2
LSB max
Dual-Channel Mode
±1
± 1
LSB max
Single-Channel Mode, External Reference
±6
± 6
LSB typ
Single-Channel Mode, Internal Reference
Gain Error Match
2
2
2
LSB max
ANALOG INPUT
Input Voltage Ranges
0 to VREF
0 to VREF
Volts
Leakage Current
±5
± 5
µA max
Input Capacitance
20
20
pF typ
REFERENCE INPUT/OUTPUT
REFIN Input Voltage Range
2.5/VDD
2.5/VDD
V min/max
Functional from 1.2 V
Input Impedance
10
10
k
Ω typ
Very High Impedance If Internal Reference Disabled
REFOUT Output Voltage
2.45/2.55
2.45/2.55
V min/max
REFOUT Tempco
±50
±50
ppm/
°C typ
LOGIC INPUTS
Input High Voltage, VINH
2.4
2.4
V min
VDD = +4.75 V to +5.25 V
2.1
2.1
V min
VDD = +2.7 V to +3.6 V
Input Low Voltage, VINL
0.8
0.8
V max
VDD = +2.7 V to +5.25 V
Input Current, IIN
±1
± 1
µA max
Typically 10 nA, VIN = 0 V or VDD
Input Capacitance, CIN
4
10
10
pF max
LOGIC OUTPUTS
Output High Voltage, VOH
ISOURCE = 200 µA
VDD – 0.5
VDD – 0.5
V min
VDD = +2.7 V to +5.25 V
Output Low Voltage, VOL
0.4
0.4
V max
ISINK = 200 µA
Floating-State Leakage Current
±1
± 1
µA max
Floating-State Output Capacitance
5
10
10
pF max
Output Coding
Straight (Natural) Binary
CONVERSION RATE
Throughput Time
16
16
SCLK Cycles
Conversion Time + Acquisition Time 125 kSPS
with 2 MHz Clock
Track/Hold Acquisition Time
2
1.5
1.5
SCLK Cycles
Conversion Time
14.5
14.5
SCLK Cycles
7.25
µs (2 MHz Clock)


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