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AD7403BRIZ-RL7 Datasheet(PDF) 17 Page - Analog Devices

Part No. AD7403BRIZ-RL7
Description  16-Bit, Isolated Sigma-Delta Modulator
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD7403BRIZ-RL7 Datasheet(HTML) 17 Page - Analog Devices

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AD7403
Data Sheet
To reconstruct the original information, this output must be
digitally filtered and decimated. A sinc3 filter is recommended
because it is one order higher than that of the AD7403 modulator,
which is a second-order modulator. If a 256 decimation rate is
used, the resulting 16-bit word rate is 78.1 kSPS, assuming a
20 MHz external clock frequency. See the Digital Filter section
for more detailed information on the sinc filter implementation.
Figure 29 shows the transfer function of the AD7403 relative to
the 16-bit output.
65535
58368
SPECIFIED RANGE
ANALOG INPUT
7168
–320mV
–250mV
+250mV +320mV
0
Figure 29. Filtered and Decimated 16-Bit Transfer Function
DIFFERENTIAL INPUTS
The analog input to the modulator is a switched capacitor
design. The analog signal is converted into charge by highly
linear sampling capacitors. A simplified equivalent circuit
diagram of the analog input is shown in Figure 30. A signal
source driving the analog input must provide the charge onto the
sampling capacitors every half MCLKIN cycle and settle to the
required accuracy within the next half cycle.
φA
φB
300Ω
VIN–
φA
φB
φB
φB
300Ω
VIN+
1.9pF
1.9pF
φA
φA
MCLKIN
Figure 30. Analog Input Equivalent Circuit
Because the AD7403 samples the differential voltage across its
analog inputs, low noise performance is attained with an input
circuit that provides low common-mode noise at each input.
DIGITAL OUTPUT
The AD7403 MDAT output driver is a slew rate limited driver.
This driver lowers electromagnetic emissions, thus minimizing
electromagnetic interference (EMI), both conducted and
radiated.
Rev. B | Page 16 of 24


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