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參數(shù)資料
| 型號： | AD9238 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | ADC |
| 英文描述： | 12-Bit, 20/40/65 MSPS Dual A/D Converter |
| 中文描述： | 12位，20/40/65 MSPS雙通道的A / D轉(zhuǎn)換器 |
| 文件頁數(shù)： | 16/24頁 |
| 文件大小： | 1737K |
| 代理商： | AD9238 |
AD9238
–16–
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 character-
istics. 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 10 shows the typical drift characteristics of the inter-
nal reference in both 1 V and 0.5 V modes.
When the SENSE pin is tied to AVDD, the internal reference will
be disabled, allowing the use of an external reference. An internal
reference buffer will load the external reference with an equiva-
lent 7 k
load. The internal buffer will still generate the positive
and negative full-scale references, REFT and REFB, for the ADC
core. The input span will always be twice the value of the refer-
ence 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 11 depicts
how the internal reference voltage is affected by loading.
VIN+
VIN–
V
REF
10
F
10
F
10
F
0.1
F
0.1
F
REFT
ADC
CORE
SELECT
LOGIC
SENSE
0.5V
AD9238
REFB
0.1
F
R1
R2
Figure 9. Programmable Reference Configuration
TEMPERATURE –
C
0.2
V
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
V
REF
= 1V
V
REF
= 0.5V
Figure 10. Typical V
Drift
REF
LOAD – mA
–0.20
E
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
Figure 11. V
Accuracy vs. Load
REF
REV. A
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD9238BST-20 | TV07RW21-35SD W/ PC CONT |
| AD9238BST-40 | 12-Bit, 20/40/65 MSPS Dual A/D Converter |
| AD9238BST-65 | 12-Bit, 20/40/65 MSPS Dual A/D Converter |
| AD9238BSTRL-20 | 12-Bit, 20/40/65 MSPS Dual A/D Converter |
| AD9238BSTRL-40 | 12-Bit, 20/40/65 MSPS Dual A/D Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD9238_05 | 制造商:AD 制造商全稱:Analog Devices 功能描述:12-Bit, 20 MSPS/40 MSPS/65 MSPS Dual A/D Converter |
| AD9238BCP-20EB | 制造商:Analog Devices 功能描述: |
| AD9238BCP-20EBZ | 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 |
| AD9238BCP-40EB | 制造商:Analog Devices 功能描述:EVAL BD FOR AD9238 DUAL A/D CNVRTR ,12-BIT, 20 MSPS/40 MSPS/ - Bulk |
| AD9238BCP-40EBZ | 制造商:Analog Devices 功能描述:EVAL BD FOR AD9238 DUAL A/D CNVRTR ,12-BIT, 20 MSPS/40 MSPS/ - Bulk |
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