參數(shù)資料
型號(hào)： AD9238BCP-65EBZ
廠商： Analog Devices Inc
文件頁數(shù)： 13/48頁
文件大?。?/td> 0K
描述： BOARD EVAL WITH AD9238BCP-65
設(shè)計(jì)資源： AD9238 Eval Brd Gerber File
標(biāo)準(zhǔn)包裝： 1
ADC 的數(shù)量： 2
位數(shù)： 12
采樣率（每秒）： 65M
數(shù)據(jù)接口： 并聯(lián)
輸入范圍： 2 Vpp
在以下條件下的電源（標(biāo)準(zhǔn)）： 640mW @ 65MSPS
工作溫度： -40°C ~ 85°C
已用 IC / 零件： AD9238-65
已供物品： 板
相關(guān)產(chǎn)品： AD9238BCPZ-20-ND - IC ADC 12BIT DUAL 20MSPS 64LFCSP
AD9238BCPZ-40-ND - IC ADC 12BIT DUAL 40MSPS 64LFCSP
AD9238BCPZ-65-ND - IC ADC 12BIT DUAL 65MSPS 64LFCSP
AD9238BSTZRL-40-ND - IC ADC 12BIT DUAL 40MSPS 64LQFP
AD9238BCPZRL-65-ND - IC ADC 12BIT DUAL 65MSPS 64LFCSP
AD9238BCPZRL-20-ND - IC ADC 12BIT DUAL 20MSPS 64LFCSP
AD9238BCPZRL-40-ND - IC ADC 12BIT DUAL 40MSPS 64LFCSP
AD9238BSTZ-40-ND - IC ADC 12BIT DUAL 40MSPS 64-LQFP
AD9238BSTRL-40-ND - IC ADC 12BIT DUAL 40MSPS 64-LQFP
AD9238BST-40-ND - IC ADC 12BIT DUAL 40MSPS 64-LQFP
AD9238
Rev. C | Page 20 of 48
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 characteristics. 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 37 shows the
typical drift characteristics of the internal reference in both
1 V and 0.5 V modes. When the SENSE pin is tied to AVDD,
the internal reference is disabled, allowing the use of an
external reference. An internal reference buffer loads the
external reference with an equivalent 7 kΩ load. The internal
buffer still generates the positive and negative full-scale
references, REFT and REFB, for the ADC core. The input span
is always twice the value of the reference 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 38
depicts how the internal reference voltage is affected by loading.
VIN+
VIN–
VREF
10
μF
10
μF
10
μF
0.1
μF
0.1
μF
REFT
ADC
CORE
SELECT
LOGIC
SENSE
0.5V
AD9238
REFB
0.1
μF
R1
R2
02640-035
Figure 36. Programmable Reference Configuration
TEMPERATURE (
°C)
0.2
VREF
ERRO
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
VREF = 1V
VREF = 0.5V
02640-067
Figure 37. Typical VREF Drift
LOAD (mA)
–0.20
ERRO
R
(
%
)
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
02640-068
Figure 38. VREF Accuracy vs. Load
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD9238BCPZ-20 功能描述:IC ADC 12BIT DUAL 20MSPS 64LFCSP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 其它有關(guān)文件:TSA1204 View All Specifications 標(biāo)準(zhǔn)包裝:1 系列:- 位數(shù):12 采樣率（每秒）:20M 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:155mW 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-TQFP 供應(yīng)商設(shè)備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數(shù)目和類型:4 個(gè)單端，單極；2 個(gè)差分，單極 產(chǎn)品目錄頁面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6
AD9238BCPZ-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
AD9238BCPZ-250 制造商:Analog Devices 功能描述:12-BIT, 20 MSPS/40 MSPS/65 MSPSDUAL A/D CONVERTER - Trays
AD9238BCPZ-40 功能描述:IC ADC 12BIT DUAL 40MSPS 64LFCSP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 位數(shù):14 采樣率（每秒）:83k 數(shù)據(jù)接口:串行，并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應(yīng)商設(shè)備封裝:28-PDIP 包裝:管件 輸入數(shù)目和類型:1 個(gè)單端，雙極
AD9238BCPZ-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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