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AD7821TE датащи(PDF) 11 Page - Analog Devices

номер детали AD7821TE
подробное описание детали  LC2MOS High Speed, mP-Compatible 8-Bit ADC with Track/Hold Function
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домашняя страница  http://www.analog.com
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AD7821TE датащи(HTML) 11 Page - Analog Devices

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AD7821
REV. A
–11–
APPLYING THE AD7821
The 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. The VREF(–) and
VREF(+) voltages required for these input ranges are outlined be-
low. See the Typical Performance Characteristics section for op-
eration with unspecified input voltage ranges.
UNIPOLAR OPERATION
Figure 18 gives the configuration and reference voltages re-
quired for 0 V to +5 V operation. The nominal transfer charac-
teristic for this input range is shown in Figure 19. The 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 OPERATION
Figure 18 gives the configuration and reference voltages
required for –2.5 V to +2.5 V operation. The nominal transfer
characteristic for this input range is shown in Figure 20.
The 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-CHANNEL TELECOM A/D CONVERTER
The fast sampling rate (1 MHz) and bipolar operation of the
AD7821 makes it useful in Telecom applications for sampling a
number of input channels using a multiplexer. Figure 21 shows
a circuit for such an application.
The maximum signal frequency required for acceptable quality
in Telecom applications is 3 kHz. The circuit given in Figure 21
permits each of the 16-input channels to be sampled at a rate of
16 kHz maximum. The sampling rate takes account of such
multiplexer parameters as tON, settling time etc. The 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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