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AD7798 データシート(PDF) 5 Page - Analog Devices

部品番号 AD7798
部品情報  Low Power, 24-Bit/16-Bit Sigma-Delta ADC with In-Amp
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メーカー  AD [Analog Devices]
ホームページ  http://www.analog.com
Logo AD - Analog Devices

AD7798 データシート(HTML) 5 Page - Analog Devices

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Data Sheet
AD7798/AD7799
Rev. B | Page 5 of 28
Parameter
AD7798B/AD7799B1
Unit
Test Conditions/Comments
SYSTEM CALIBRATION2
Full-Scale Calibration Limit
1.05 × FS
V max
FS = Full-scale analog input. When VREF = AVDD, the
differential input must be limited to (0.9 × VREF/gain)
if the in-amp is active.
Zero-Scale Calibration Limit
−1.05 × FS
V min
Input Span
0.8 × FS
V min
2.1 × FS
V max
POWER REQUIREMENTS7
Power Supply Voltage
AVDD – GND
2.7/5.25
V min/max
DVDD – GND
2.7/5.25
V min/max
Power Supply Currents
IDD Current
140
µA max
Unbuffered mode, 110 µA typ @ AVDD = 3 V,
125 µA typ @ AVDD = 5 V
180
µA max
Buffered mode, gain = 1 or 2, 130 µA typ @ AVDD = 3 V,
165 µA typ @ AVDD = 5 V
400
µA max
AD7798: gain = 4 to 128, 300 µA typ @ AVDD = 3 V,
350 µA typ @ AVDD = 5 V
500
µA max
AD7799: gain = 4 to 128, 380 µA typ @ AVDD = 3 V,
440 µA typ @ AVDD = 5 V
IDD (Power-Down Mode)
1
µA max
1
Temperature range is –40°C to +105°C. At the 19.6 Hz and 39.2 Hz update rates, the INL, power supply rejection (PSR), common-mode rejection (CMR), and normal
mode rejection (NMR) do not meet the data sheet specification if the voltage on the AIN(+) or AIN(−) pins exceeds AVDD − 1.6 V typically. When this voltage is
exceeded, the INL, for example, is reduced to 18 ppm of FS typically and the PSR is reduced to 69 dB typically. Therefore, for guaranteed performance at these update
rates, the absolute voltage on the analog input pins needs to be below AVDD − 1.6 V.
2
Specification is not production tested, but is supported by characterization data at initial product release.
3
Following a calibration, this error is in the order of the noise for the programmed gain and update rate selected.
4
Recalibration at any temperature removes these errors.
5
Full-scale error applies to both positive and negative full-scale and applies at the factory calibration conditions (AVDD = 4 V, gain = 1, TA = 25°C).
6
FS[3:0] are the four bits used in the mode register to select the output word rate.
7
Digital inputs equal to DVDD or GND.


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