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参数资料
| 型号： | EVAL-AD7767-2EDZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 9/25页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR AD7767 |
| 标准包装： | 1 |
| ADC 的数量： | 1 |
| 位数： | 24 |
| 采样率（每秒）： | 32k |
| 数据接口： | 串行 |
| 输入范围： | ±VREF |
| 在以下条件下的电源（标准）： | 8.5mW @ 32kSPS |
| 工作温度： | -40°C ~ 105°C |
| 已用 IC / 零件： | AD7767-2 |
| 已供物品： | 板，CD |
| 其它名称： | Q3407966 |
AD7767
Rev. C | Page 16 of
24
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Figure 32. AD7767 Digital Filter Frequency Response
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–40
–60
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–160
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Figure 33. AD7767-1 Digital Filter Frequency Response
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–20
–40
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Figure 34. AD7767-2 Digital Filter Frequency Response
ANALOG INPUT STRUCTURE
The AD7767/AD7767-1/AD7767-2 are configured as a differential
input structure. A true differential signal is sampled between the
analog inputs VIN+ and VIN, Pin 4 and Pin 5, respectively. Using
differential inputs provides rejection of signals that are common
to both the VIN+ and VIN pins.
Figure 35 shows the equivalent analog input circuit of the
AD7767/AD7767-1/AD7767-2. The two diodes on each of the
differential inputs provide ESD protection for the analog inputs.
06
85
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21
9
VIN+
VREF+
C1
D
GND
AGND
RIN
C2
VIN–
VREF+
C1
D
GND
AGND
RIN
C2
Figure 35. Equivalent Analog Input Structure
Take care to ensure that the analog input signal does not exceed
the reference supply voltage (VREF+) by more than 0.3 V, as specified
in the Absolute Maximum Ratings section. If the input voltage
exceeds this limit, the diodes become forward biased and start
to conduct current. The diodes can handle 130 mA maximum.
The impedance of the analog inputs can be modeled as a parallel
combination of C1 and the network formed by the series con-
nection of RIN, C1, and C2. The value of C1 is dominated by the
pin capacitance. RIN is typically 1.4 kΩ, the lumped component
of serial resistors and the RON of the switches. C2 is typically
22 pF, and its value is dominated by the sampling capacitor.
SUPPLY AND REFERENCE VOLTAGES
The AD7767/AD7767-1/AD7767-2 operate from a 2.5 V supply
applied to the DVDD and AVDD pins. The interface is specified to
operate between 1.7 V and 3.6 V. The AD7767/AD7767-1/
AD7767-2 operate from a reference input in the range of 2.2 V
to 2 × AVDD applied to the VREF+ pin. The nominal reference
supply voltage is 5 V, but a 2.5 V supply can also be used. When
using a 5 V reference, the recommended reference devices are
the reference input (VREF+) operates both as a reference supply
and as a power supply to the AD7767/AD7767-1/AD7767-2
device. Therefore, when using a 5 V reference input, the full-scale
differential input range of the AD7767/AD7767-1/AD7767-2
is 10 V. See the Driving the AD7767 section for details on the
maximum input voltage.
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| EVAL-AD7781EBZ | 功能描述:BOARD EVAL FOR AD7781 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- ADC 的数量:1 位数:12 采样率（每秒）:94.4k 数据接口:USB 输入范围:±VREF/2 在以下条件下的电源（标准）:- 工作温度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，软件 |
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