Datasheet 搜索 > AD转换器 > ADI（亚德诺） > AD7785BRUZ-REEL 数据手册 > AD7785BRUZ-REEL 产品设计参考手册 3/32 页
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AD7785BRUZ-REEL 产品设计参考手册 - ADI（亚德诺）
制造商:
ADI（亚德诺）
分类:
AD转换器
封装:
TSSOP-16
描述:
3通道，低噪声，低功耗， 20位⒉-ツADC，具有片内仪表放大器和基准 3-Channel, Low Noise, Low Power, 20-Bit ⒉-ツ ADC with On-Chip In-Amp and Reference
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AD7785BRUZ-REEL数据手册
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AD7785
Rev. 0 | Page 3 of 32
SPECIFICATIONS
AV
DD
= 2.7 V to 5.25 V; DV
DD
= 2.7 V to 5.25 V; GND = 0 V; all specifications T
MIN
to T
MAX
, unless otherwise noted.
Table 1.
Parameter AD7785B
1
Unit Test Conditions/Comments
ADC CHANNEL
Output Update Rate 4.17 to 470 Hz nom
No Missing Codes
2
20 Bits min
Resolution See Output Noise and Resolution Specifications
Output Noise and Update Rates See Output Noise and Resolution Specifications
Integral Nonlinearity ±15 ppm of FSR max
Offset Error
3
±1 μV typ
Offset Error Drift vs. Temperature
4
±10 nV/°C typ
Full-Scale Error
3, 5
±10 μV typ
Gain Drift vs. Temperature
4
±1 ppm/°C typ Gain = 1 to 16, external reference
±3 ppm/°C typ Gain = 32 to 128, external reference
Power Supply Rejection 100 dB min AIN = 1 V/gain, gain ≥ 4, external reference
ANALOG INPUTS
Differential Input Voltage Ranges ±V
REF
/Gain V nom
V
REF
= REFIN(+) − REFIN(−) or internal reference,
gain = 1 to 128
Absolute AIN Voltage Limits
2
Unbuffered Mode GND – 30 mV V min Gain = 1 or 2
AV
DD
+ 30 mV V max
Buffered Mode GND + 100 mV V min Gain = 1 or 2
AV
DD
– 100 mV V max
In-Amp Active GND + 300 mV V min Gain = 4 to 128
AV
DD
– 1.1 V max
Common-Mode Voltage, V
CM
0.5 V min
V
CM
= (AIN(+) + AIN(−))/2, gain = 4 to 128
Analog Input Current
Buffered Mode or In-Amp Active
Average Input Current
2
±1 nA max Gain = 1 or 2, update rate < 100 Hz
±250 pA max Gain = 4 to 128, update rate < 100 Hz
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
Normal Mode Rejection
2
Internal Clock
@ 50 Hz, 60 Hz 65 dB min 80 dB typ, 50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 1010
6
@ 50 Hz 80 dB min 90 dB typ, 50 ± 1 Hz, FS[3:0] = 1001
6
@ 60 Hz 90 dB min 100 dB typ, 60 ± 1 Hz, FS[3:0] = 1000
6
External Clock
@ 50 Hz, 60 Hz 80 dB min 90 dB typ, 50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 1010
6
@ 50 Hz 94 dB min 100 dB typ, 50 ± 1 Hz, FS[3:0] = 1001
6
@ 60 Hz 90 dB min 100 dB typ, 60 ± 1 Hz, FS[3:0] = 1000
6
Common-Mode Rejection
@ DC 100 dB min AIN = 1 V/gain, gain ≥ 4
@ 50 Hz, 60 Hz
2
100 dB min 50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 1010
6
@ 50 Hz, 60 Hz
2
100 dB min
50 ± 1 Hz (FS[3:0] = 1001)
6
, 60 ± 1 Hz
(FS[3:0] = 1000)
6
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