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AD7785 데이터시트(HTML) 5 Page - Analog Devices

부품명 AD7785
상세내용  3-Channel, Low Noise, Low Power, 20-Bit ∑-Δ ADC with On-Chip In-Amp and Reference
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제조사  AD [Analog Devices]
홈페이지  http://www.analog.com
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AD7785 데이터시트(HTML) 5 Page - Analog Devices

 
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AD7785
Rev. 0 | Page 5 of 32
Parameter
AD7785B1
Unit
Test Conditions/Comments
SCLK, CLK, and DIN (Schmitt-
Triggered Input)2
VT(+)
1.4/2
V min/V max
DVDD = 5 V
VT(–)
0.8/1.7
V min/V max
DVDD = 5 V
VT(+)
− VT(−)
0.1/0.17
V min/V max
DVDD = 5 V
VT(+)
0.9/2
V min/V max
DVDD = 3 V
VT(–)
0.4/1.35
V min/V max
DVDD = 3 V
VT(+)
− VT(−)
0.06/0.13
V min/V max
DVDD = 3 V
Input Currents
Input Capacitance
±10
10
μA max
pF typ
VIN = DVDD or GND
All digital inputs
LOGIC OUTPUTS (INCLUDING CLK)
VOH, Output High Voltage2
DVDD
− 0.6
V min
DVDD = 3 V, ISOURCE = 100 μA
VOL, Output Low Voltage2
0.4
V max
DVDD = 3 V, ISINK = 100 μA
VOH, Output High Voltage2
4
V min
DVDD = 5 V, ISOURCE = 200 μA
VOL, Output Low Voltage2
0.4
V max
DVDD = 5 V, ISINK = 1.6 mA (DOUT/RDY)/
800 μA (CLK)
Floating-State Leakage Current
±10
μA max
Floating-State Output Capacitance
10
pF typ
Data Output Coding
Offset binary
SYSTEM CALIBRATION2
Full-Scale Calibration Limit
+1.05 × FS
V max
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
to GND
2.7/5.25
V min/max
DVDD
to GND
2.7/5.25
V min/max
Power Supply Currents
IDD Current
140
μA max
110 μA typ @ AVDD = 3 V, 125 μA typ @ AVDD = 5 V,
unbuffered mode, external reference
185
μA max
130 μA typ @ AVDD = 3 V, 165 μA typ @ AVDD = 5 V,
buffered mode, gain = 1 or 2, external reference
400
μA max
300 μA typ @ AVDD = 3 V, 350 μA typ @ AVDD = 5 V,
gain = 4 to 128, external reference
500
μA max
400 μA typ @ AVDD = 3 V, 450 μA typ @ AVDD = 5 V,
gain = 4 to 128, internal reference
IDD (Power-Down Mode)
1
μA max
1 Temperature range is –40°C to +105°C.
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 with excitation currents and bias voltage generator disabled.


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