参数资料
型号: AD9222ABCPZ-65
厂商: Analog Devices Inc
文件页数: 26/60页
文件大小: 0K
描述: IC ADC 12BIT SRL 65MSPS 64LFCSP
标准包装: 1
位数: 12
采样率(每秒): 65M
数据接口: 串行,SPI?
转换器数目: 8
功率耗散(最大): 950.5mW
电压电源: 模拟和数字
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 64-VFQFN 裸露焊盘,CSP
供应商设备封装: 64-LFCSP-VQ(9x9)
包装: 托盘
输入数目和类型: 16 个单端,单极;8 个差分,单极
AD9222
Data Sheet
Rev. F | Page 32 of 60
External Reference Operation
The use of an external reference may be necessary to enhance
the gain accuracy of the ADC or improve thermal drift charac-
teristics. Figure 82 shows the typical drift characteristics of the
internal reference in 1 V mode.
When the SENSE pin is tied to AVDD, the internal reference is
disabled, allowing the use of an external reference. The external
reference is loaded with an equivalent 6 k load. An internal
reference buffer generates the positive and negative full-scale
references, REFT and REFB, for the ADC core. Therefore, the
external reference must be limited to a nominal of 1.0 V.
0
1.0
0.5
2.0
1.5
3.0
2.5
3.5
V
RE
F
E
RRO
R
(
%)
CURRENT LOAD (mA)
05727-
083
–30
–5
–10
–15
–20
–25
5
0
Figure 81. VREF Accuracy vs. Load, AD9222-50
0.02
–0.18
–0.14
–0.10
–0.06
–0.02
–0.16
–0.12
–0.08
–0.04
0
–40
V
RE
F
E
RRO
R
(
%)
TEMPERATURE (°C)
05967-
028
–20
0
20
40
60
80
Figure 82. Typical VREF Drift, AD9222-50
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