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| 型号： | AD9238BST-40 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 13/48页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT DUAL 40MSPS 64-LQFP |
| 产品变化通告： | AD9238 Lead Discontinuation 12/Sept/2011 |
| 标准包装： | 1 |
| 位数： | 12 |
| 采样率（每秒）： | 40M |
| 数据接口： | 并联 |
| 转换器数目： | 2 |
| 功率耗散（最大）： | 330mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 64-LQFP |
| 供应商设备封装： | 64-LQFP（7x7） |
| 包装： | 托盘 |
| 输入数目和类型： | 4 个单端，单极；2 个差分，单极 |
| 配用： | AD9238BCP-65EBZ-ND - BOARD EVAL WITH AD9238BCP-65 |
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AD9238
Rev. C | Page 20 of 48
External Reference Operation
The use of an external reference may be necessary to
enhance the gain accuracy of the ADC or to improve thermal
drift characteristics. When multiple ADCs track one another, a
single reference (internal or external) may be necessary to
reduce gain matching errors to an acceptable level. A high
precision external reference may also be selected to provide
lower gain and offset temperature drift. Figure 37 shows the
typical drift characteristics of the internal reference in both
1 V and 0.5 V modes. When the SENSE pin is tied to AVDD,
the internal reference is disabled, allowing the use of an
external reference. An internal reference buffer loads the
external reference with an equivalent 7 kΩ load. The internal
buffer still generates the positive and negative full-scale
references, REFT and REFB, for the ADC core. The input span
is always twice the value of the reference voltage; therefore, the
external reference must be limited to a maximum of 1 V. If the
internal reference of the AD9238 is used to drive multiple
converters to improve gain matching, the loading of the
reference by the other converters must be considered. Figure 38
depicts how the internal reference voltage is affected by loading.
VIN+
VIN–
VREF
10
μF
10
μF
10
μF
0.1
μF
0.1
μF
REFT
ADC
CORE
SELECT
LOGIC
SENSE
0.5V
AD9238
REFB
0.1
μF
R1
R2
02640-035
Figure 36. Programmable Reference Configuration
TEMPERATURE (
°C)
0.2
VREF
ERRO
R
(
%
)
1.2
1.0
0.8
0.6
0.4
0
–40 –30 –20 –10
0
10
20
30
40
50
60
70
80
VREF = 1V
VREF = 0.5V
02640-067
Figure 37. Typical VREF Drift
LOAD (mA)
–0.20
ERRO
R
(
%
)
0.05
0
–0.05
–0.10
–0.15
–0.25
0
0.5
1.0
1.5
2.0
2.5
3.0
0.5V ERROR
1V ERROR
02640-068
Figure 38. VREF Accuracy vs. Load
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD9238BST-40EBZ | 制造商:Analog Devices 功能描述:Evaluation Board For AD9238 Dual A/D Converter ,12-Bit, 20 MSPS/40 MSPS/65 MSPS 制造商:Analog Devices 功能描述:EVAL BD FOR AD9238 DUAL A/D CNVRTR ,12-BIT, 20 MSPS/40 MSPS/ - Bulk |
| AD9238BST-40PCB | 制造商:Analog Devices 功能描述:Evaluation Board For AD9238 Dual A/D Converter ,12-Bit, 20 MSPS/40 MSPS/65 MSPS 制造商:Analog Devices 功能描述:EVAL BD FOR AD9238 DUAL A/D CNVRTR ,12-BIT, 20 MSPS/40 MSPS/ - Bulk |
| AD9238BST-40PCBZ | 制造商:Analog Devices 功能描述:DUAL 12 BIT 3V CMOS 20/40/65 MSPS ADC - Bulk |
| AD9238BST-65 | 功能描述:IC ADC 12BIT DUAL 65MSPS 64-LQFP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 位数:12 采样率（每秒）:3M 数据接口:- 转换器数目:- 功率耗散（最大）:- 电压电源:- 工作温度:- 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-23-6 包装:带卷 (TR) 输入数目和类型:- |
| AD9238BST-65PCB | 制造商:Analog Devices 功能描述:Evaluation Board For AD9238 Dual A/D Converter ,12-Bit, 20 MSPS/40 MSPS/65 MSPS 制造商:Rochester Electronics LLC 功能描述:DUAL 12 BIT 3V CMOS 20/40/65 MSPS ADC - Bulk |
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