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參數(shù)資料
| 型號： | AD7824 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | High Speed 4-Channel 8-Bit ADC(四通道LC2MOS高速8位A/D轉(zhuǎn)換器) |
| 中文描述： | 高速4通道8位ADC（四通道LC2MOS高速8位的A / D轉(zhuǎn)換器） |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 273K |
| 代理商： | AD7824 |
AD7824/AD7828
REV. C
–6–
OPE RAT IONAL DIAGRAM
T he AD7824 is a 4-channel 8-bit A/D converter and the
AD7828 is an 8-channel 8-bit A/D converter. Operational dia-
grams for both of these devices are shown in Figures 3 and 4.
T he addition of just a +5 V reference allows the devices to
perform the analog-to-digital function.
Figure 3. AD7824 Operational Diagram
Figure 4. AD7828 Operational Diagram
CIRCUIT INFORMAT ION
BASIC DE SCRIPT ION
T he AD7824/AD7828 uses a half-flash conversion technique
whereby two 4-bit flash A/D converters are used to achieve an
8-bit result. Each 4-bit flash ADC contains 15 comparators
which compare the unknown input to a reference ladder to get
a 4-bit result. For a full 8-bit reading to be realized, the upper
4-bit flash, the most significant (MS) flash, performs a conver-
sion to provide the 4 most significant data bits. An internal
DAC, driven by the 4 MSBs, then recreates an analog approxi-
mation of the input voltage. T his analog result is subtracted
from the input, and the difference is converted by the lower
flash ADC, the least significant (LS) flash, to provide the 4 least
significant bits of the output data.
APPLYING T HE AD7824/AD7828
RE FE RE NCE AND INPUT
T he two reference inputs on the AD7824/AD7828 are fully dif-
ferential and define the zero to full-scale input range of the A/D
converter. As a result, the span of the analog input voltage for
all channels can easily be varied. By reducing the reference
span, V
REF
(+) – V
REF
(–), to less than 5 V the sensitivity of the
converter can be increased (e.g., if V
REF
= 2 V then 1 LSB =
7.8 mV). T he input/reference arrangement also facilitates ratio-
metric operation.
T his reference flexibility also allows the input channel voltage
span to be offset from zero. T he voltage at V
REF
(–) sets the in-
put level for all channels which produces a digital output of all
zeroes. T herefore, although the analog inputs are not them-
selves differential, they have nearly differential-input capability
in most measurement applications because of the reference de-
sign. Figures 5 to 7 show some of the configurations that are
possible.
Figure 5. Power Supply as Reference
Figure 6. External Reference Using the AD580, Full-Scale
Input is 2.5 V
Figure 7. Input Not Referenced to GND
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD7834AN | 2.35V-5.25V, 12 bit, 1MSPS, Serial ADC 6-SOT-23 -40 to 125 |
| AD7834AR | 2.35V-5.25V, 12 bit, 1MSPS, Serial ADC 6-SOT-23 -40 to 125 |
| AD7834BN | 2.35V-5.25V, 12 bit, 1MSPS, Serial ADC 6-SC70 -40 to 125 |
| AD7834BR | 2.35V-5.25V, 12 bit, 1MSPS, Serial ADC 6-SC70 -40 to 125 |
| AD7834SQ | LC2MOS Quad 14-Bit DAC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7824BCHIPS | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Single-Ended Data Acquisition System |
| AD7824BQ | 功能描述:IC ADC 8BIT LC2MOS 4CH HS 24CDIP RoHS:否 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 個單端，單極；2 個差分，單極 產(chǎn)品目錄頁面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6 |
| AD7824BQ/+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Single-Ended Data Acquisition System |
| AD7824CQ | 功能描述:IC ADC 8BIT LC2MOS 4CH HS 24CDIP RoHS:否 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 個單端，雙極 |
| AD7824CQ/+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Single-Ended Data Acquisition System |
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