參數(shù)資料
型號(hào): AD9228
廠商: Analog Devices, Inc.
英文描述: Quad, 12-bit, 40/65 MSPS Serial LVDS 1.8 V A/D Converter
中文描述: 四,12位,六十五分之四十○MSPS的串行LVDS 1.8弗吉尼亞州/ D轉(zhuǎn)換器
文件頁數(shù): 28/52頁
文件大小: 1659K
代理商: AD9228
AD9228
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 67 shows the typical drift characteristics of the
internal reference in 1 V mode.
Rev. 0 | Page 28 of 52
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 kΩ 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
R
CURRENT LOAD (mA)
0
–30
–5
–10
–15
–20
–25
5
0
Figure 66. V
REF
Accuracy vs. Load
V
R
0
–0.05
0
0.05
0.10
–0.10
0.15
–0.15
0.20
–0.20
–40
–20
80
60
40
20
0
TEMPERATURE (°C)
Figure 67. Typical V
REF
Drift
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