–45–
AD7730/AD7730L
Parameter B Version
1
Units Conditions/Comments
STATIC PERFORMANCE (CHP = 1)
No Missing Codes
2
24 Bits min
Output Noise and Update Rates
2
See Tables XXI & XXII
Integral Nonlinearity 22 ppm of FSR max
Offset Error
2
See Note 3 Offset Error and Offset Drift Refer to Both
Offset Drift vs. Temperature
2
5 nV/°C typ Unipolar Offset and Bipolar Zero Errors
Offset Drift vs. Time
4
25 nV/1000 Hours typ
Positive Full-Scale Error
2, 5
See Note 3
Positive Full-Scale Drift vs Temp
2, 6, 7
3 ppm of FS/°C max
Positive Full-Scale Drift vs Time
4
10 ppm of FS/1000 Hours typ
Gain Error
2, 8
See Note 3
Gain Drift vs. Temperature
2, 6, 9
3 ppm/°C max
Gain Drift vs. Time
4
10 ppm/1000 Hours typ
Bipolar Negative Full-Scale Error
2
See Note 3
Negative Full-Scale Drift vs. Temp
2, 6
3 ppm of FS/°C max
Power Supply Rejection 120 dB typ Measured with Zero Differential Voltage
Common-Mode Rejection (CMR) 118 dB min
At DC.
Measured with Zero Differential Voltage
Analog Input DC Bias Current
2
40 nA max
Analog Input DC Bias Current Drift
2
100 pA/°C typ
Analog Input DC Offset Current
2
10 nA max
Analog Input DC Offset Current Drift
2
50 pA/°C typ
STATIC PERFORMANCE (CHP = 0)
2
No Missing Codes 24 Bits min SKIP = 0
10
Output Noise and Update Rates See Tables XXIII & XXIV
Integral Nonlinearity 22 ppm of FSR max
Offset Error See Note 3 Offset Error and Offset Drift Refer to Both
Offset Drift vs. Temperature
6
0.5 μV/°C typ Unipolar Offset and Bipolar Zero Errors
Offset Drift vs. Time
4
2.5 μV/1000 Hours typ
Positive Full-Scale Error
5
See Note 3
Positive Full-Scale Drift vs. Temp
6, 7
0.6 μV/°C typ
Positive Full-Scale Drift vs. Time
4
3 μV/1000 Hours typ
Gain Error
8
See Note 3
Gain Drift vs. Temperature
6, 9
2 ppm/°C typ
Gain Drift vs. Time
4
10 ppm/1000 Hours typ
Bipolar Negative Full-Scale Error See Note 3
Negative Full-Scale Drift vs. Temp 0.6 μV/°C typ
Power Supply Rejection 90 dB typ Measured with Zero Differential Voltage
Common-Mode Rejection (CMR) on AIN 105 dB typ
At DC.
Measured with Zero Differential Voltage
CMR on REF IN 100 dB typ
At DC.
Measured with Zero Differential Voltage
Analog Input DC Bias Current 50 nA max
Analog Input DC Bias Current Drift 150 pA/°C typ
Analog Input DC Offset Current 25 nA max
Analog Input DC Offset Current Drift 75 pA/°C typ
ANALOG INPUTS/REFERENCE INPUTS
Normal-Mode 50 Hz Rejection
2
88 dB min From 49 Hz to 51 Hz
Normal-Mode 60 Hz Rejection
2
88 dB min From 59 Hz to 61 Hz
Common-Mode 50 Hz Rejection
2
120 dB min From 49 Hz to 51 Hz
Common-Mode 60 Hz Rejection
2
120 dB min From 59 Hz to 61 Hz
Analog Inputs
Differential Input Voltage Ranges
11
Assuming 2.5 V or 5 V Reference with
HIREF Bit Set Appropriately
0 to +10 or ± 10 mV nom Gain = 250
0 to +20 or ± 20 mV nom Gain = 125
0 to +40 or ± 40 mV nom Gain = 62.5
0 to +80 or ± 80 mV nom Gain = 31.25
Absolute/Common-Mode Voltage
12
AGND + 1.2 V V min
AV
DD
– 0.95 V V max
Reference Input
REF IN(+) – REF IN(–) Voltage +2.5 V nom HIREF Bit of Mode Register = 0
REF IN(+) – REF IN(–) Voltage +5 V nom HIREF Bit of Mode Register = 1
Absolute/Common-Mode Voltage
13
AGND – 30 mV V min
AV
DD
+ 30 mV V max
NO REF Trigger Voltage 0.3 V min NO REF Bit Active If V
REF
Below This Voltage
0.65 V max NO REF Bit Inactive If V
REF
Above This Voltage
AD7730L–SPECIFICATIONS
(AV
DD
= +5 V, DV
DD
= +3 V or +5 V; REF IN(+) =
AV
DD
; REF IN(–) = AGND = DGND = 0 V; f
CLK IN
= 2.4576 MHz. All specifications T
MIN
to T
MAX
unless otherwise noted.)
REV. B
