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| 型号： | EVAL-AD7794EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 36/37页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR AD7794 |
| 产品培训模块： | ADC Applications ADC Architectures ADC DC/AC Performance |
| 标准包装： | 1 |
| ADC 的数量： | 1 |
| 位数： | 24 |
| 采样率（每秒）： | 470 |
| 数据接口： | SPI?、QSPI?、MICROWIRE? 和 DSP |
| 输入范围： | ±VREF/增益 |
| 在以下条件下的电源（标准）： | 2.5mW @ 470SPS |
| 工作温度： | -40°C ~ 105°C |
| 已用 IC / 零件： | AD7794 |
| 已供物品： | 板，缆线，CD |
| 相关产品： | AD7794CRUZ-REEL-ND - IC ADC 24BIT 6CH LP 24-TSSOP AD7794CRUZ-ND - IC ADC 24BIT 6CH LP 24-TSSOP AD7794BRU-ND - IC ADC 24BIT 6CH LP 24-TSSOP AD7794BRUZ-REEL-ND - IC ADC 24BIT 6CH LP 24-TSSOP AD7794BRU-REEL-ND - IC ADC 24BIT 6CH LP 24-TSSOP AD7794BRUZ-ND - IC ADC 24BIT SIG-DEL 6CH 24TSSOP |
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AD7794/AD7795
Rev. D | Page 7 of 36
Parameter1
AD7794/AD7795
Unit
Test Conditions/Comments
LOGIC OUTPUT (INCLUDING CLK)
DVDD 0.6
V min
DVDD = 3 V, ISOURCE = 100 μA
0.4
V max
DVDD = 3 V, ISINK = 100 μA
4
V min
DVDD = 5 V, ISOURCE = 200 μA
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
AD7794B, AD7795B
2
μA max
AD7794C
1 Temperature range: B Grade: 40°C to +105°C, C Grade: 40°C to +125°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. In addition, the offset error and offset error drift degrade at these update rates when chopping is disabled. When this voltage is exceeded, the INL, for
example, is reduced to 18 ppm of FS typically while 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 with excitation currents and bias voltage generator disabled.
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