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ADUM7703 Datasheet(PDF) 19 Page - Analog Devices

Part No. ADUM7703
Description  16-Bit, Isolated, Sigma-Delta ADC
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADUM7703 Datasheet(HTML) 19 Page - Analog Devices

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Data Sheet
ADuM7703
Rev. 0 | Page 19 of 22
The input filter configuration for the ADuM7703 is not limited
to the low-pass structure shown in Figure 29. The differential RC
filter configuration shown in Figure 30 also achieves excellent
performance. Recommended values for the resistors and
capacitor are 22 Ω and 47 pF, respectively.
R
VIN–
R
VIN+
C
ADuM7703
Figure 30. Differential RC Filter Network
DIGITAL FILTER
The output of the ADuM7703 is a continuous digital bit stream.
To reconstruct the original input signal information, this output
bit stream must be digitally filtered and decimated. A sinc filter
is recommended due to simplicity of the filter. A sinc3 filter is
recommended because the filter is one order higher than that of
the ADuM7703 modulator, which is a second-order modulator.
The type of filter selected, the decimation rate, and the modulator
clock used determines the overall system resolution and
throughput rate. The higher the decimation rate, the greater the
system accuracy, as shown in Figure 31. However, there is a
trade-off between accuracy and throughput rate and, therefore,
higher decimation rates result in lower throughput solutions.
Note that for a given bandwidth requirement, a higher MCLKIN
frequency can allow higher decimation rates to be used, resulting
in higher SNR performance.
10
100
DECIMATION RATE (MHz)
1000
fIN = 1kHz
Figure 31. SNR vs. Decimation Rate of Sinc3 Filter Order
A sinc3 filter is recommended for the ADuM7703. This filter
can be implemented on a field programmable gate array
(FPGA) or a digital signal processor (DSP). Equation 1
describes the transfer function of a sinc filter.


DR
1
1
1
() =
1
N
Z
HZ
DR
Z




(1)
where:
Z is the sample.
DR is the decimation rate.
N is the sinc filter order.
The throughput rate of the sinc filter is determined by the
modulator clock and the decimation rate selected.
Throughput = MCLK/DR
(2)
where MCLK is the modulator clock frequency.
As the decimation rate increases, the data output size from
the sinc filter increases. The output data size is expressed in
Equation 3. The 16 most significant bits are used to return a
16-bit result.
Data Size = N × log2 DR
(3)
For a sinc3 filter, the −3 dB filter response point can be derived
from the filter transfer function, Equation 1, and is 0.262 times
the throughput rate. The filter characteristics for a third-order
sinc filter are summarized in Table 14.
Table 14. Sinc3 Filter Characteristics for 20 MHz MCLKIN
Decimation Ratio (DR)
Throughput Rate (kHz)
Output Data Size (Bits)
Filter Response (kHz)
32
625
15
163.7
64
312.5
18
81.8
128
156.2
21
40.9
256
78.1
24
20.4
512
39.1
27
10.2


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