AD7718鈥揝PECIFICATIONS1 (AV DD
鍙冩暩(sh霉)璩囨枡
鍨嬭櫉锛� AD7718BRU-REEL7
寤犲晢锛� Analog Devices Inc
鏂囦欢闋佹暩(sh霉)锛� 34/44闋�
鏂囦欢澶�?銆�?/td> 0K
鎻忚堪锛� IC ADC 24BIT R-R 8/10CH 28-TSSOP
妯�(bi膩o)婧�(zh菙n)鍖呰锛� 1
浣嶆暩(sh霉)锛� 24
閲囨ǎ鐜囷紙姣忕锛夛細 1.37k
鏁�(sh霉)鎿�(j霉)鎺ュ彛锛� DSP锛孧ICROWIRE?锛孮SPI?锛屼覆琛�锛孲PI?
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鍔熺巼鑰楁暎锛堟渶澶э級锛� 3.84mW
闆诲闆绘簮锛� 妯℃摤鍜屾暩(sh霉)瀛�
宸ヤ綔婧害锛� -40°C ~ 85°C
瀹夎椤炲瀷锛� 琛ㄩ潰璨艰
灏佽/澶栨锛� 28-TSSOP锛�0.173"锛�4.40mm 瀵級
渚涙噳(y墨ng)鍟嗚ō(sh猫)鍌欏皝瑁濓細 28-TSSOP
鍖呰锛� 鍓垏甯� (CT)
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閰嶇敤锛� EVAL-AD7718EBZ-ND - BOARD EVALUATION FOR AD7718
鍏跺畠鍚嶇ū锛� AD7718BRU-REEL7CT
REV. 0
鈥�4鈥�
AD7718鈥揝PECIFICATIONS1 (AV
DD = 2.7 V to 3.6 V or 4.75 V to 5.25 V, DVDD = 2.7 V to 3.6 V or 4.75 V to 5.25 V, REFIN(+) =
2.5 V ; REFIN(鈥�) = AGND; AGND = DGND = 0 V; XTAL1/XTAL2 = 32.768 kHz Crystal Input Buffer Enabled. All specifications TMIN to TMAX unless otherwise noted.)
Parameter
B Grade
Unit
Test Conditions
AD7718 (CHOP ENABLED)
Output Update Rate
5.4
Hz min
CHOP = 0
105
Hz max
No Missing Codes
2
24
Bits min
20 Hz Update Rate
Resolution
13
Bits p-p
卤20 mV Range, 20 Hz Update Rate
18
Bits p-p
卤2.56 V Range, 20 Hz Update Rate
Output Noise and Update Rates
See Tables in
ADC Description
Integral Nonlinearity
卤10
ppm of FSR max
2 ppm Typical
Offset Error
3
卤3
V typ
Offset Error Drift vs. Temp
4
10
nV/
掳C typ
Full-Scale Error
3
卤10
V/掳C typ
Gain Drift vs. Temp
4
卤0.5
ppm/
掳C typ
ANALOG INPUTS
Differential Input Full-Scale Voltage
卤1.024 脳 REFIN/GAIN V nom
REFIN Refers to Both REFIN1 and
REFIN2. REFIN = REFIN(+) REFIN(鈥�)
GAIN = 1 to 128
Range Matching
卤2
V typ
Analog Input = 18 mV
Absolute AIN Voltage Limits
AGND + 100 mV
V min
AIN1鈥揂IN10 and AINCOM with
AVDD 鈥� 100 mV
V max
NEGBUF = 1
Absolute AINCOM Voltage Limits
AGND 鈥� 30 mV
V min
NEGBUF = 0
AVDD + 30 mV
V max
Analog Input Current
AIN1鈥揂IN10 and AINCOM with
NEGBUF = 1
DC Input Current
2
卤1
nA max
DC Input Current Drift
卤5
pA/
掳C typ
AINCOM Input Current
NEGBUF = 0
DC Input Current
2
卤125
nA/V typ
卤2.56 V Range
DC Bias Current Drift
卤2
pA/V/
掳C typ
Normal-Mode Rejection
2
@ 50 Hz
100
dB min
50 Hz
卤 1 Hz, SF Word = 82
@ 60 Hz
100
dB min
60 Hz
卤 1 Hz, SF Word = 68
Common-Mode Rejection
@ DC
90
dB min
100 dB typ, Analog Input = 1 V,
Input Range =
卤2.56 V
110 dB typ on
卤20 mV Range
@ 50 Hz
2
100
dB min
50 Hz
卤 1 Hz, 20 Hz Update Rate
@ 60 Hz
2
100
dB min
60 Hz
卤 1 Hz, 20 Hz Update Rate
REFERENCE INPUTS (REFIN1 AND REFIN2)
REFIN(+) to REFIN(鈥�) Voltage
2.5
V nom
REFIN Refers to Both REFIN1 and
REFIN2
REFIN(+) to REFIN(鈥�) Range
2
1V min
AVDD
V max
REFIN Common-Mode Range
AGND 鈥� 30 mV
V min
AVDD + 30 mV
V max
Reference DC Input Current
2
卤0.5
A/V typ
Reference DC Input Current Drift
卤0.01
nA/V/
掳C typ
Normal-Mode Rejection
2
@ 50 Hz
100
dB min
50 Hz
卤 1 Hz, SF Word = 82
@ 60 Hz
100
dB min
60 Hz
卤 1 Hz, SF Word = 68
Common-Mode Rejection
2
Input Range =
卤2.56 V
@ DC
110
dB typ
Analog Input = 1 V
@ 50 Hz
110
dB typ
50 Hz
卤 1 Hz, 20 Hz Update Rate
@ 60 Hz
110
dB typ
60 Hz
卤 1 Hz, 20 Hz Update Rate
LOGIC INPUTS
5
All Inputs Except SCLK and XTAL1
2
VINL, Input Low Voltage
0.8
V max
DVDD = 5 V
VINL, Input Low Voltage
0.4
V max
DVDD = 3 V
VINH, Input High Voltage
2.0
V min
DVDD = 3 V or 5 V
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