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參數資料
| 型號： | AD7821 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | LC2MOS High Speed, μP-Compatible 8-Bit ADC with Track/Hold Function(帶跟蹤/保持功能,LC2MOSμP兼容8位高速A/D轉換器) |
| 中文描述： | LC2MOS高速，微處理器兼容的8位ADC的采樣/保持功能（帶跟蹤/保持功能，LC2MOSμP兼容8位高速的A / D轉換器） |
| 文件頁數： | 11/12頁 |
| 文件大小： | 263K |
| 代理商： | AD7821 |
AD7821
REV. A
–11–
APPLY ING T HE AD7821
T he AD7821 is specified for a unipolar input range of 0 to +5 V
and a bipolar input range of –2.5 V to +2.5 V. T he V
REF
(–) and
V
REF
(+) voltages required for these input ranges are outlined be-
low. See the T ypical Performance Characteristics section for op-
eration with unspecified input voltage ranges.
UNIPOLAR OPE RAT ION
Figure 18 gives the configuration and reference voltages re-
quired for 0 V to +5 V operation. T he nominal transfer charac-
teristic for this input range is shown in Figure 19. T he output
code is Natural Binary with 1 LSB = (5/256) V = 19.5 mV.
Figure 18. AD7821 Unipolar/Bipolar Operation
Figure 19. Nominal Transfer Characteristic for Unipolar
(0 V to +5 V) Operation
BIPOLAR OPE RAT ION
Figure 18 gives the configuration and reference voltages
required for –2.5 V to +2.5 V operation. T he nominal transfer
characteristic for this input range is shown in Figure 20.
T he output code is Offset Binary with 1 LSB = ([+2.5 –
(–2.5)]/256) V = 19.5 mV.
Figure 20. Nominal Transfer Characteristic for Bipolar
(–2.5 V to +2.5 V) Operation
16-CHANNE L T E LE COM A/D CONVE RT E R
T he fast sampling rate (1 MHz) and bipolar operation of the
AD7821 makes it useful in T elecom applications for sampling a
number of input channels using a multiplexer. Figure 21 shows
a circuit for such an application.
T he maximum signal frequency required for acceptable quality
in T elecom applications is 3 kHz. T he circuit given in Figure 21
permits each of the 16-input channels to be sampled at a rate of
16 kHz maximum. T he sampling rate takes account of such
multiplexer parameters as t
ON
, settling time etc. T he circuit also
eases the problem of the antialiasing filter design by sampling at
a rate much greater than that required by the Nyquist criterion.
Figure 21. 16-Channel Telecom A/D Converter System
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7821BQ | 功能描述:IC ADC 8BIT HS TRACK/HOLD 20CDIP RoHS:否 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:- 位數:14 采樣率（每秒）:83k 數據接口:串行，并聯 轉換器數目: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） 供應商設備封裝:28-PDIP 包裝:管件 輸入數目和類型:1 個單端，雙極 |
| AD7821KN | 功能描述:IC ADC 8BIT LC2MOS T/H HS 20-DIP RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:12 采樣率（每秒）:300k 數據接口:并聯 轉換器數目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數目和類型:1 個單端，單極；1 個單端，雙極 |
| AD7821KNZ | 功能描述:IC ADC 8BIT LC2MOS T/H HS 20-DIP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:12 采樣率（每秒）:300k 數據接口:并聯 轉換器數目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數目和類型:1 個單端，單極；1 個單端，雙極 |
| AD7821KNZ | 制造商:Analog Devices 功能描述:IC 8-BIT ADC |
| AD7821KP | 制造商:AD 制造商全稱:Analog Devices 功能描述:LC2MOS High Speed, mP-Compatible 8-Bit ADC with Track/Hold Function |
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