參數(shù)資料
型號(hào): AD9212BCPZRL7-65
廠商: ANALOG DEVICES INC
元件分類: ADC
英文描述: Octal, 10-Bit, 40/65 MSPS Serial LVDS 1.8 V A/D Converter
中文描述: 8-CH 10-BIT FLASH METHOD ADC, SERIAL ACCESS, QCC64
封裝: 9 X 9 MM, ROHS COMPLIANT, MO-220VMMD-4, LFCSP-64
文件頁數(shù): 29/56頁
文件大?。?/td> 1840K
代理商: AD9212BCPZRL7-65
AD9212
Rev. 0 | Page 29 of 56
1μF
0.1μF
V
REF
SENSE
0.5V
REFT
0.1μF
0.1μF
2.2μF
0.1μF
REFB
SELECT
LOGIC
ADC
CORE
+
VIN–
VIN+
0
Figure 67. Internal Reference Configuration
1μF
1
0.1μF
1
V
REF
SENSE
AVDD
0.5V
REFT
0.1μF
0.1μF
2.2μF
0.1μF
REFB
SELECT
LOGIC
ADC
CORE
+
VIN–
VIN+
EXTERNAL
REFERENCE
1
OPTIONAL.
0
Figure 68. External Reference Operation
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 70 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 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 69. V
REF
Accuracy vs. Load
0.02
–0.18
–0.14
–0.10
–0.06
–0.02
–0.16
–0.12
–0.08
–0.04
0
–40
V
R
TEMPERATURE (°C)
0
–20
0
20
40
60
80
Figure 70. Typical V
REF
Drift
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