AD7751 查看數據表（PDF） - Analog Devices
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AD7751 Datasheet PDF : 16 Pages
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AD7751–SPECIFICATIONS1, 2 (AVDD = DVDD = 5 V ؎ 5%, AGND = DGND = 0 V, On-Chip Reference, CLKIN =
3.58 MHz, TMIN to TMAX = –40؇C to +85؇C)
Parameter
A Version B Version Unit
Test Conditions/Comments
ACCURACY3
Measurement Error1 on Channels 1 and 2
Gain = 1
0.1
0.1
Gain = 2
0.1
0.1
Gain = 8
0.1
0.1
Gain = 16
0.1
0.1
Phase Error1 Between Channels
V1 Phase Lead 37°
(PF = 0.8 Capacitive)
± 0.1
± 0.1
V1 Phase Lag 60°
(PF = 0.5 Inductive)
AC Power Supply Rejection1
± 0.1
± 0.1
Output Frequency Variation (CF)
0.2
0.2
DC Power Supply Rejection1
Output Frequency Variation (CF)
± 0.3
± 0.3
FAULT DETECTION1, 4
Fault Detection Threshold
Inactive i/p <> Active i/p
Input Swap Threshold
Inactive i/p > Active i/p
Accuracy Fault Mode Operation
V1A Active, V1B = AGND
V1B Active, V1A = AGND
Fault Detection Delay
Swap Delay
12.5
12.5
14
14
0.1
0.1
0.1
0.1
3
3
3
3
% Reading typ
% Reading typ
% Reading typ
% Reading typ
One Channel with Full-Scale Signal (±660 mV)
Over a Dynamic Range 500 to 1
Over a Dynamic Range 500 to 1
Over a Dynamic Range 500 to 1
Over a Dynamic Range 500 to 1
Line Frequency = 45 Hz to 55 Hz
Degrees(°) max AC/DC = 0 and AC/DC = 1
Degrees(°) max
% Reading typ
% Reading typ
AC/DC = 0 and AC/DC = 1
AC/DC = 1, S0 = S1 = 1, G0 = G1 = 0
V1 = 100 mV rms, V2 = 100 mV rms @ 50 Hz
Ripple on AVDD of 200 mV rms @ 100 Hz
AC/DC = 1, S0 = S1 = 1, G0 = G1 = 0
V1 = 100 mV rms, V2 = 100 mV rms,
AVDD = DVDD = 5 V ± 250 mV
See Fault Detection Section
% typ
(V1A or V1B Active)
% of Active typ (V1A or V1B Active)
% Reading typ
% Reading typ
Second typ
Second typ
Over a Dynamic Range 500 to 1
Over a Dynamic Range 500 to 1
ANALOG INPUTS
Maximum Signal Levels
Input Impedance (DC)
Bandwidth
ADC Offset Error1
Gain Error1
Gain Error Match1
±1
±1
390
390
14
14
± 20
± 20
±4
±4
± 0.2
± 0.2
V max
kΩ min
kHz typ
mV max
% Ideal typ
% Ideal typ
See Analog Inputs Section
V1A, V1B, V1N, V2N and V2P to AGND
CLKIN = 3.58 MHz
CLKIN/256, CLKIN = 3.58 MHz
See Terminology and Performance Graphs
External 2.5 V Reference, Gain = 1,
V1 = V2 = 660 mV dc
External 2.5 V Reference
REFERENCE INPUT
REFIN/OUT Input Voltage Range
Input Impedance
Input Capacitance
2.7
2.7
2.3
2.3
3.2
3.2
10
10
V max
V min
kΩ min
pF max
2.5 V + 8%
2.5 V – 8%
ON-CHIP REFERENCE
Reference Error
Temperature Coefficient
± 200
± 30
± 200
± 30
± 60
mV max
ppm/°C typ
ppm/°C max
Nominal 2.5 V
CLKIN
Input Clock Frequency
4
4
1
1
MHz max
MHz min
Note All Specifications for CLKIN of 3.58 MHz
LOGIC INPUTS5
SCF, S0, S1, AC/DC,
RESET, G0 and G1
Input High Voltage, VINH
Input Low Voltage, VINL
Input Current, IIN
Input Capacitance, CIN
2.4
2.4
0.8
0.8
±3
±3
10
10
V min
V max
µA max
pF max
DVDD = 5 V ± 5%
DVDD = 5 V ± 5%
Typically 10 nA, VIN = 0 V to DVDD
–2–
REV. A
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