AD7791 Analog Devices, AD7791 Datasheet - Page 3

• Manufacturer Part Number: AD7791
• Description: 24-Bit, Single-Channel, Ultra Low Power, Sigma Delta A/D Converter
• Manufacturer: Analog Devices

Specifications of AD7791

• Resolution (bits): 24bit
• # Chan: 1
• Sample Rate: n/a
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni
• Ain Range: (2Vref) p-p
• Adc Architecture: Sigma-Delta
• Pkg Type: SOP

AD7791—SPECIFICATIONS
Table 1. (V
all specifications T
Parameter
ADC CHANNEL SPECIFICATION
ADC CHANNEL
ANALOG INPUTS
REFERENCE INPUT
1
2
3
4
Temperature Range –40°C to +105°C.
Specification is not production tested but is supported by characterization data at initial product release.
Full-scale error applies to both positive and negative full-scale and applies at the factory calibration conditions (V
FS[2:0] are the three bits used in the filter register to select the output word rate.
Output Update Rate
No Missing Codes
Resolution
Output Noise
Integral Nonlinearity
Offset Error
Offset Error Drift vs. Temperature
Full-Scale Error
Gain Drift vs. Temperature
Power Supply Rejection
Differential Input Voltage Ranges
Absolute AIN Voltage Limits
Analog Input Current
Absolute AIN Voltage Limits
Analog Input Current
Normal Mode Rejection
Common Mode Rejection
REFIN Voltage
Reference Voltage Range
Absolute REFIN Voltage Limits
Average Reference Input Current
Average Reference Input Current Drift
Average Input Current
Average Input Current Drift
Average Input Current
Average Input Current Drift
@ 50 Hz, 60 Hz
@ 50 Hz
@ 60 Hz
@DC
@ 50 Hz, 60 Hz
DD
= 2.5 V to 5.25 V; REFIN(+) = 2.5 V; REFIN(–) = GND; GND = 0 V; CDIV1 = CDIV0 = 0;
3
2
MIN
2
to T
2
2
2
MAX
2
2
, unless otherwise noted.)
2
1
AD7791B
9.5
120
24
19.5
1.1
±15
±3
±10
±10
±0.5
90
±REFIN
GND + 100 mV
V
±1
±5
GND – 30 mV
V
±400
±50
65
80
80
90
100
2.5
0.1
GND – 30 mV
V
0.5
±0.03
V
DD
DD
DD
DD
– 100 mV
+ 30 mV
+ 30 mV
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Unit
Hz min nom
Hz max nom
Bits min
Bits p-p
µV rms typ
ppm of FSR max
µV typ
nV/°C typ
µV typ
ppm/°C typ
dB min
V nom
V min
V max
nA max
pA/°C typ
V min
V max
nA/V typ
pA/V/°C typ
dB min
dB min
dB min
dB min
dB min
V nom
V min
V max
V min
V max
µA/V typ
nA/V/°C typ
Test Conditions/Comments
Update Rate ≤ 20 Hz
9.5 Hz Update Rate
3.5 ppm typ
100 dB typ, AIN = 1 V
REFIN = REFIN(+) – REFIN(–);
Buffered Mode of Operation
Buffered Mode of Operation
Unbuffered Mode of Operation
Unbuffered Mode of Operation
Input current varies with input voltage.
73 dB typ, 50 ± 1 Hz, 60 ± 1 Hz, FS[2:0] = 100
90 dB typ, 50 ± 1 Hz, FS[2:0] = 101
90 dB typ, 60 ± 1 Hz, FS[2:0] = 011
AIN = 1 V
100 dB typ, FS[2:0] = 100
50 ± 1 Hz (FS[2:0] = 101
REFIN = REFIN(+) – REFIN(–)
DD
= 4 V).
4
), 60 ± 1 Hz (FS[2:0] = 011
4
4
4
AD7791
4
4
)