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參數(shù)資料
型號(hào)： EVAL-AD7785EBZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 28/32頁(yè)
文件大?。?/td> 0K
描述： BOARD EVALUATION FOR AD7785
標(biāo)準(zhǔn)包裝： 1
ADC 的數(shù)量： 1
位數(shù)： 20
采樣率（每秒）： 470
數(shù)據(jù)接口： 串行
輸入范圍： ±VREF
工作溫度： -40°C ~ 105°C
已用 IC / 零件： AD7785
已供物品： 板，纜線，CD
相關(guān)產(chǎn)品： AD7785BRUZ-REEL-ND - IC ADC 20BIT 3CH LN LP 16-TSSOP
AD7785BRUZ-ND - IC ADC 20BIT SIGMA-DELTA 16TSSOP
AD7785
Rev. 0 | Page 5 of 32
Parameter
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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