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參數(shù)資料
| 型號： | AD7821TE |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | LC2MOS High Speed, mP-Compatible 8-Bit ADC with Track/Hold Function |
| 中文描述： | 1-CH 8-BIT FLASH METHOD ADC, PARALLEL ACCESS, CQCC20 |
| 封裝： | CERAMIC, LCC-20 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大小： | 249K |
| 代理商： | AD7821TE |
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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| AD7821TE/883B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog-to-Digital Converter， 8-Bit |
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| AD7821TQ/883B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog-to-Digital Converter， 8-Bit |
| AD7822 | 制造商:AD 制造商全稱:Analog Devices 功能描述:3 V/5 V, 2 MSPS, 8-Bit, 1-, 4-, 8-Channel Sampling ADCs |
| AD7822_06 | 制造商:AD 制造商全稱:Analog Devices 功能描述:3 V/5 V, 2 MSPS, 8-Bit, 1-/4-/8-Channel Sampling ADCs |
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