IsoLoop
IL700-Series Isolator
Evaluation Board
®
Board No.: IL700-01
NVE Corporation
(952) 829-9217
iso-apps@nve.com
www.IsoLoop.com
www.nve.com
About This Board
This evaluation board lets you try a variety of NVE’s flagship series of award-winning of
IsoLoop Isolators.
The board has four IL700-Series isolators in four package types:
• IL716E (wide-body SOIC-16)
• IL715-3E (narrow-body SOIC-16)
• IL712-3E (SOIC-8)
• IL710S-1E (MSOP-8)
IL700-Series Isolators use patented spintronic Giant Magnetoresistive (GMR) technology. The
symmetric magnetic coupling barrier provides a typical propagation delay of only 10 ns and a
pulse width distortion as low as 300 ps, the best of any isolator. And their real ceramic/
polymer barriers last pretty much forever.
IL700 /IL200-Series Specification Highlights
• Up to 150 Mbps (S-Series)
• PWD to 300 ps (S-Series)
• 100 ps Typical Pulse Jitter
• 10 ns Typical Propagation Delay
• 4 ns Typical Prop. Delay Skew
• 2 mA/Channel Max. Quiescent Current
• Up to 125°C (T-Series)
• 2.5 kVrms Isolation (1 min.)
• 25,000 Year Barrier Life
• UL1577 and IEC61010 Approved
• MSOP, SOIC, and PDIP Packages
NVE Corporation
(952) 829-9217
iso-apps@nve.com
www.IsoLoop.com
www.nve.com
Application Information
Why Isolate?
Isolation reduces noise, eliminates ground loops, and improves safety.
Applications
Popular IL700/IL200 applications include multiplexed data transmission, board-to-board
communication, serial communications, and logic-level shifting.
Board Layout Speed Limitations
Circuit board traces should be as short as possible with a minimum of vias for best
performance. Since the evaluation board was designed for ease of use and with test points, it
may not provide maximum speed.
Electrostatic Discharge Sensitivity
This product has been tested for electrostatic sensitivity to the limits in the datasheet.
However, all integrated circuits and boards should be handled with appropriate care to avoid
damage. Damage caused by inappropriate handling or storage could range from performance
degradation to complete failure.
Electromagnetic Compatibility
IsoLoop Isolators have the lowest EMC footprint of any isolation technology. IsoLoop
Isolators’ Wheatstone bridge configuration and differential magnetic field signaling ensure
excellent EMC performance against all relevant standards. These isolators are fully compliant
with generic EMC standards EN50081, EN50082-1 and the umbrella line-voltage standard for
Information Technology Equipment (ITE) EN61000.
Power Supply Decoupling and Ground Planes
As shown on this board, both isolator power supplies should be decoupled with low-ESR
47 nF ceramic capacitors. Bypass capacitors should be as close as possible to the V
DD
pins.
Ground planes for both GND
1
and GND
2
are recommended for data rates above 10 Mbps.
Signal Status on Start-up and Shut Down
To minimize power dissipation, IL700 input signals are differentiated and then latched on the
output side of the isolation barrier to reconstruct the signal. This could result in an ambiguous
output state depending on power up, shutdown and power loss sequencing. Therefore, the
designer should consider including an initialization signal in the start-up circuit. Initialization
consists of toggling the input either high then low, or low then high.
NVE Corporation
(952) 829-9217
iso-apps@nve.com
www.IsoLoop.com
www.nve.com
Serial Interface Illustrative Applications
DD2
ADR 0...7, CS
XTAL1
XTAL2
SJA1000
Tx0
Rx0
1
2
3
4
8
7
6
5
3
TxD
RxD
1
4
2
7
CANH
CANL
6
IL712/IL721
TJA1050
2
Isolating Standard CAN Transceivers
Isolating CANbus allows higher speed and more reliable operation by eliminating ground
loops and reducing noise susceptibility. This simple circuit works with any CAN transceiver
with a TxD dominant timeout, which includes all of the current-generation transceivers
including the ubiquitous Philips/NXP TJA1050. Propagation delay is critical for CANbus, and
the IL712 and IL721 bidirectional isolators have best-in-class propagation delay of 10 ns.
5V
USB_P
1
12 MHz
2
4.7k
D+ 19
18
D-
17
VUSB
R
T
OSC2
RST
MCP2200
12
USB_N
1
3
2
5
VBUS
D+
D-
GN D
USB
VDD
OSC1
0.1µF
To Controller
10
3.3V
R
T
GN D
GND_USB
IL712/IL721
3
4
CTS 13
20
VSS
Isolated USB UART Using an IL712 or IL721
Isolating the input to a USB controller (rather than the bus lines) requires fewer isolation
channels and is therefore usually the simplest solution, as shown above. The Microchip
MCP2200 is a USB 2.0 to UART protocol converter.
Visit
www.IsoLoop.com
for more illustrative IsoLoop Isolator applications.
NVE Corporation
(952) 829-9217
iso-apps@nve.com
www.IsoLoop.com
www.nve.com
ADC and DAC Illustrative Applications
Bridge
Bias
Delta Sigma A/D
CS5532
Serial Data Out
Serial Data In
Bridge +
Bridge -
Data Clock
Chip Select
IL717
Iso SD Out
Iso DS In
Iso Data Clock
Iso CS
Single-Channel Isolated SPI Delta-Sigma A/D Converter Using IL717
This circuit illustrates a typical single-channel delta-sigma isolated ADC
SPI interface. The A/D is located on the bridge with no signal
conditioning electronics between the bridge sensor and the ADC. In this
case, the IL717 is the best choice for isolation. It isolates the control bus
from the microcontroller. The system clock is located on the isolated side
of the system.
Sampling ADC
ADS7825
Multi-Channel Isolated
Sampling A/D Converter
The IL261 is ideal for isolating multi-
channel sampling ADCs. Isolated
channels A0 and A1 control the analog
channel being sampled, while the three
remaining IL261 I/O lines isolate the
SPI interface.
Analog Ch 0
Analog Ch 1
Analog Ch 2
Analog Ch 3
Serial Data Out
R/C
Data Clock
Channel A0
Channel A1
IL261
Isolation
Boundary
Iso SD Out
Iso Read/Conv
Iso Data Clock
Iso Ch A0
Iso Ch A1
Visit
www.IsoLoop.com
for more illustrative IsoLoop Isolator applications.
NVE Corporation
(952) 829-9217
iso-apps@nve.com
www.IsoLoop.com
www.nve.com
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