AD7731_15 Datasheet, PDF (2/44 Pages) Analog Devices – Low Noise, High Throughput 24-Bit Sigma-Delta ADC

AD7731–SPECIFICATIONS (AVDD = +5 V, DVDD = +3 V or +5 V; REF IN(+) = +2.5 V; REF IN(–) = AGND; AGND =
DGND = 0 V; f_{CLK IN} = 4.9152 MHz. All specifications T_MIN to T_MAX unless otherwise noted.)
Parameter
B Version¹
Units
Conditions/Comments
STATIC PERFORMANCE (CHP = 0)
No Missing Codes²
Output Noise and Update Rates²
Integral Nonlinearity
Offset Error²
Offset Drift vs. Temperature²
Offset Drift vs. Time⁵
Positive Full-Scale Error^{2, 6}
Positive Full-Scale Drift vs. Temp^{2, 7, 8}
Positive Full-Scale Drift vs. Time⁵
Gain Error^{2, 9}
Gain Drift vs. Temperature^{2, 7, 10}
Gain Drift vs. Time⁵
Bipolar Negative Full-Scale Error²
Negative Full-Scale Drift vs. Temp^{2, 7}
Power Supply Rejection¹¹
Power Supply Rejection¹¹
Common-Mode Rejection (CMR)¹¹
On AIN
On AIN
On REF IN
Analog Input DC Bias Current²
Analog Input DC Bias Current Drift²
Analog Input DC Offset Current²
Analog Input DC Offset Current Drift²
24
See Tables I and II
15
See Note 4
0.5
1/2/5
2.5
See Note 4
0.6
1.5/3/6
3
See Note 4
2
10
See Note 4
1
90
60
95
85
120
60
150
30
100
Bits min
ppm of FSR max
µV/°C typ
µV/°C typ
µV/1000 Hr
µV/°C typ
µV/°C typ
µV/1000 Hr
ppm/°C typ
ppm/1000 Hr
µV/°C typ
dB typ
dB typ
dB typ
dB typ
dB typ
nA max
pA/°C typ
nA max
pA/°C typ
SKIP = 0³
Offset Error and Offset Drift Refer to Both
Input Range = 20 mV, 40 mV, 80 mV, 160 mV
Input Range = 320 mV/640 mV/1.28 V
Input Range = 20 mV, 40 mV, 80 mV, 160 mV
Input Range = 320 mV/640 mV/1.28 V
Input Range = 20 mV
Input Range = 1.28 V
At DC. Input Range = 20 mV
At DC. Input Range = 1.28 V
STATIC PERFORMANCE (CHP = 1)²
No Missing Codes
Output Noise and Update Rates
Integral Nonlinearity
Offset Error
Offset Drift vs. Temperature
Offset Drift vs. Time⁵
Positive Full-Scale Error⁶
Positive Full-Scale Drift vs. Temp^{7, 8}
Positive Full-Scale Drift vs. Time⁵
Gain Error⁹
Gain Drift vs. Temperature^{7, 10}
Gain Drift vs. Time⁵
Bipolar Negative Full-Scale Error
Negative Full-Scale Drift vs. Temp
Power Supply Rejection¹¹
Power Supply Rejection¹¹
Common-Mode Rejection (CMR)¹¹
On AIN
On AIN
On REF IN
Analog Input DC Bias Current
Analog Input DC Bias Current Drift
Analog Input DC Offset Current
Analog Input DC Offset Current Drift
24
See Tables III and IV
15
See Note 4
5
25
See Note 4
2
10
See Note 4
2
10
See Note 4
2
110
85
110
85
120
50
100
10
50
Bits min
ppm of FSR max
nV/°C typ
nV/1000 Hr typ
Offset Error and Offset Drift Refer to Both
Unipolar Offset and Bipolar Zero Errors
ppm of FS/°C max
ppm of FS/1000 Hr
ppm/°C max
ppm/1000 Hr
ppm of FS/°C max
dB typ
dB typ
Input Range = 20 mV
Input Range = 1.28 V
dB typ
dB typ
dB typ
nA max
pA/°C typ
nA max
pA/°C typ
At DC. Input Range = 20 mV
At DC. Input Range = 1.28 V
ANALOG INPUTS/REFERENCE INPUTS
Normal Mode 50 Hz/60 Hz Rejection²
88
Common-Mode 50 Hz/60 Hz Rejection² 120
Analog Inputs
Differential Input Voltage Ranges¹²
0 to +20 or ± 20
0 to +40 or ± 40
0 to +80 or ± 80
0 to +160 or ± 160
0 to +320 or ± 320
0 to +640 or ± 640
0 to +1.28 or ± 1.28
dB min
dB min
mV nom
mV nom
mV nom
mV nom
mV nom
mV nom
V nom
50 Hz/60 Hz ± 1 Hz. SKIP = 0
50 Hz/60 Hz ± 1 Hz. SKIP = 0
Assuming 2.5 V or 5 V Reference with HIREF
Bit Set Appropriately
RN2, RN1, RN0 of Mode Register = 0, 0, 1
RN2, RN1, RN0 of Mode Register = 0, 1, 0
RN2, RN1, RN0 of Mode Register = 0, 1, 1
RN2, RN1, RN0 of Mode Register = 1, 0, 0
RN2, RN1, RN0 of Mode Register = 1, 0, 1
RN2, RN1, RN0 of Mode Register = 1, 1, 0
RN2, RN1, RN0 of Mode Register = 1, 1, 1
–2–
R_EV.. _A0