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AD7794 Fiches technique(PDF) 3 Page - Analog Devices

No de pièce AD7794
Description  Low Power, 24-Bit Sigma-Delta ADC with In-Amp and Embedded Reference (6 Channel)
Download  21 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD7794 Fiches technique(HTML) 3 Page - Analog Devices

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Preliminary Technical Data
AD7794
REV.PrE 6/04 | Page 3
AD7794—SPECIFICATIONS1
Table 1. (AVDD = 2.7 V to 5.25 V; DVDD = 2.7 V to 5.25 V; GND = 0 V; all specifications TMIN to TMAX, unless otherwise noted.)
Parameter
AD7794B
Unit
Test Conditions/Comments
AD7794 (CHOP ENABLED)
Output Update Rate
4
Hz min nom
Settling Time = 2/Output Update Rate
500
Hz max nom
No Missing Codes2
24
Bits min
fADC ≤125 Hz
Resolution (pk – pk)
16
Bits p-p
Gain = 128, 16.6 Hz Update Rate, VREF = 2.5 V
19
Bits p-p
Gain = 1, 16.6 Hz Update Rate, VREF = 2.5 V
Output Noise and Update Rates
See Tables in ADC
Description
Integral Nonlinearity
±15
ppm of FSR max
3.5 ppm typ. Gain = 1 to 32
±25
ppm of FSR max
5 ppm typ, Gain = 64 or 128
Offset Error3
±3
µV typ
Offset Error Drift vs. Temperature4
±10
nV/°C typ
Full-Scale Error3, 5
±10
µV typ
Gain Drift vs. Temperature4
±0.5
ppm/°C typ
Gain = 1 or 2
±3
ppm/°C typ
Gain = 4 to 128
Power Supply Rejection
90
dB min
100 dB typ, AIN = FS/2
ANALOG INPUTS
Differential Input Voltage Ranges
±REFIN/Gain
V nom
REFIN = REFIN(+) – REFIN(–) or Internal Reference,
Gain = 1 to 128
Absolute AIN Voltage Limits2
Unbuffered Mode
GND – 30 mV
V min
Gain = 1 or 2
AVDD + 30 mV
V max
Buffered Mode
GND + 100 mV
V min
Gain = 1 or 2
AVDD – 100 mV
V max
In-Amp Enabled
GND + 300 mV
V min
Gain = 4 to 128
AVDD – 1.1
V max
Common Mode Voltage
0.5
V min
Gain = 4 to 128
Analog Input Current
Buffered Mode or In-Amp Enabled
Average Input Current2
±200
pA max
Average Input Current Drift
±2
pA/°C typ
Unbuffered Mode
Gain = 1 or 2
Average Input Current
±400
nA/V typ
Input current varies with input voltage.
Average Input Current Drift
±50
pA/V/°C typ
1
nA max
AIN6(+) / AIN6(-)
Normal Mode Rejection2
Internal Clock
@ 50 Hz, 60 Hz
70
dB min
80 dB typ, 50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 10106
@ 50 Hz
84
dB min
90 dB typ, 50 ± 1 Hz, FS[3:0] = 10016
@ 60 Hz
90
dB min
100 dB typ, 60 ± 1 Hz, FS[3:0] = 10006
External Clock
@ 50 Hz, 60 Hz
80
dB min
90 dB typ, 50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 10106
@ 50 Hz
94
dB min
100 dB typ, 50 ± 1 Hz, FS[3:0] = 10016
@ 60 Hz
Common Mode Rejection
90
dB min
100 dB typ, 60 ± 1 Hz, FS[3:0] = 10006
AIN = +FS/2
@DC
90
dB min
FS[3:0] = 10106
@ 50 Hz, 60 Hz2
100
dB min
50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 10106
@ 50 Hz, 60 Hz2
100
dB min
50 ± 1 Hz (FS[3:0] = 10016), 60 ± 1 Hz (FS[3:0] =
10006)


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