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參數資料
| 型號： | AD9238BSTRL-65 |
| 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： | 2-CH 12-BIT FLASH METHOD ADC, PARALLEL ACCESS, PQFP64 |
| 封裝： | LEAD FREE, MS-026-BBD, LQFP-64 |
| 文件頁數： | 16/24頁 |
| 文件大小： | 1737K |
| 代理商： | AD9238BSTRL-65 |
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
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD9238BSTZ-20 | 功能描述:IC ADC 12BIT DUAL 20MSPS 64-LQFP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1 系列:microPOWER™ 位數:8 采樣率（每秒）:1M 數據接口:串行，SPI? 轉換器數目:1 功率耗散（最大）:- 電壓電源:模擬和數字 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應商設備封裝:24-VQFN 裸露焊盤（4x4） 包裝:Digi-Reel® 輸入數目和類型:8 個單端，單極 產品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
| AD9238BSTZ-20EB | 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 |
| AD9238BSTZ-40 | 功能描述:IC ADC 12BIT DUAL 40MSPS 64-LQFP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1 系列:microPOWER™ 位數:8 采樣率（每秒）:1M 數據接口:串行，SPI? 轉換器數目:1 功率耗散（最大）:- 電壓電源:模擬和數字 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應商設備封裝:24-VQFN 裸露焊盤（4x4） 包裝:Digi-Reel® 輸入數目和類型:8 個單端，單極 產品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
| AD9238BSTZ-40 | 制造商:Analog Devices 功能描述:IC 12-BIT ADC |
| AD9238BSTZ-40EB | 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 |
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