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Circuit Note
The SDOlo and ALERTlo daisy-chain connections pass data
9000
CN-0235
down the chain, and the 22 pF capacitors on these pins are
terminated to the VDD of the lower device in the chain. A direct
low impedance trace is used to connect the VDD of the lower
device with the VSS of the upper device to hold the two
potentials as close as possible together in a noisy environment.
A ground fence at the isolation barrier is used to enclose the low
8000
7000
6000
5000
4000
7893
voltage side, which consists of the left hand side of the PCB.
This fence consists of a guard ring laced together by vias and
connects to the digital ground on all layers throughout the
board. Noise on power and ground planes that reach the edge of
the circuit board can radiate causing emissions, but with this
shielded structure the noise is reflected back.
3000
2000
1000
0
531
2555
2556
CODE
1701
2557
115
2558
Input-to-output dipole radiation can also be generated when
Figure 6. Histogram of Codes for 10,000 Samples, VIN4 – VIN3 of Device 0
driving a current source across a gap between ground planes. To
help minimize this, a continuous shield is used at the isolation
gap whereby the ground planes are extended on all layers
throughout the PCB to create a cross-barrier coupling using
overlapping shields; and the isolation gap on each layer is kept
to a minimum, with a gap of 0.008 inches used on the tested
board. For further recommendations to control radiated
emissions with isoPower? devices, such as the ADuM5404 used
Test Results
6000
5000
4000
3000
2000
1000
5019
4016
921
An important measure of the performance of the circuit is the
amount of noise in the final output voltage measurement.
0
246
2404
2405
2406
2407
Figure 6 shows a histogram of 10,000 measurement samples
taken for the VIN3?VIN2 channel. This data was taken
with the CN0235 Evaluation Board connected to the
EVAL-SDP-CB1Z System Demonstration Platform (SDP-B)
evaluation board. Details of the setup are described in the
Circuit Evaluation and Test section of this circuit note.
Twelve Li-Ion batteries were connected to the input screw
terminals. Note that there are only a small percentage of codes
that fall outside the primary bin due to noise. Figure 6 and
Figure 7 show 3 LSBs peak-to-peak noise, corresponding to
approximately 0.5 LSBs rms.
A complete design support package for this circuit note can be
found at www.analog.com/CN0235-DesignSupport.
CODE
Figure 7. Histogram for 10,000 Samples, VIN4 - VIN3 of Device 1
COMMON VARIATIONS
The circuit is proven to work with good stability and accuracy.
Other combinations of isolated channels can be used with the
i Coupler isolation products.
CIRCUIT EVALUATION AND TEST
This circuit uses the EVAL-CN0235-SDPZ circuit board and
the EVAL-SDP-CB1Z System Demonstration Platform (SDP-B)
evaluation board. The two boards have 120-pin mating
connectors, allowing for the quick setup and evaluation of the
circuit’s performance. The EVAL-CN0235-SDPZ board contains
the circuit to be evaluated, as described in this note, and the
SDP-B evaluation board is used with the CN0235 evaluation
software to capture the data from the EVAL-CN0235-SDPZ
circuit board.
Rev. 0 | Page 5 of 6
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