il511-3etr7 NVE Corp., il511-3etr7 Datasheet - Page 9

• Manufacturer Part Number: il511-3etr7
• Description: 2 Mbps Dc-correct Digital Isolators
• Manufacturer: NVE Corp.

Application Information
Electrostatic Discharge Sensitivity
This product has been tested for electrostatic sensitivity to the
limits stated in the specifications. However, NVE recommends that
all integrated circuits 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
The IL500-Series is fully compliant with generic EMC standards
EN50081, EN50082-1 and the umbrella line-voltage standard for
Information Technology Equipment (ITE) EN61000. The IsoLoop
Isolator’s Wheatstone bridge configuration and differential
magnetic field signaling ensure excellent EMC performance against
all relevant standards. NVE conducted compliance tests in the
categories below:
EN50081-1
EN50082-2: Industrial Environment
ENV50204
Immunity to external magnetic fields is even higher if the field
direction is “end-to-end” rather than to “pin-to-pin” as shown in the
diagram below:
Dynamic Power Consumption
IsoLoop Isolators achieve their low power consumption from the
way they transmit data across the isolation barrier. A magnetic field
is created around the GMR Wheatstone bridge by detecting the
edge transitions of the input logic signal and converting them to
narrow current pulses. Depending on the direction of the magnetic
field, the bridge causes the output comparator to switch following
the input logic signal. Since the current pulses are narrow, about
2.5 ns, the power consumption is independent of mark-to-space
ratio and solely dependent on frequency. This has obvious
advantages over optocouplers, which have power consumption
heavily dependent on mark-to-space ratio.
Residential, Commercial & Light Industrial
Methods EN55022, EN55014
Methods EN61000-4-2 (ESD), EN61000-4-3 (Electromagnetic
Field Immunity), EN61000-4-4 (Electrical Transient Immunity),
EN61000-4-6 (RFI Immunity), EN61000-4-8 (Power Frequency
Magnetic Field Immunity), EN61000-4-9 (Pulsed Magnetic
Field), EN61000-4-10 (Damped Oscillatory Magnetic Field)
Radiated Field from Digital Telephones (Immunity Test)
Cross-axis Field Direction
IL510/IL511/IL514/IL515/IL516
9
Power Supply Decoupling
Both power supplies to these devices should be decoupled with low
ESR ceramic capacitors of at least 47 nF. Capacitors must be
located as close as possible to the V
DC Correctness, EMC, and the SYNC Function
NVE digital isolators have the lowest EMC noise signature of any
high-speed digital isolator on the market today because of the dc
nature of the GMR sensors used. It is perhaps fair to include opto-
couplers in that dc category too, but their limited parametric
performance, physically large size, and wear-out problems
effectively limit side by side comparisons between NVE’s isolators
and isolators coupled with RF, matched capacitors, or transformers.
The IL500-Series marks a departure from other NVE coupler
families with the inclusion of a patented, controllable refresh clock.
The clock ensures that outputs will be synchronized to inputs
within 9 μs of the supply voltage passing the CMOS circuit’s 1.5 V
V
an external synchronization clock. There are several advantages to
this form of control, the most important being that at power up the
user no longer needs to design a synchronization circuit or add
firmware to ensure the output is at the same logic level as the input.
Unlike other technologies, however, the clock is not required for
normal operation and can be gated off to reduce the EMC signature
of the end product. This has many advantages in noise-critical
applications such as hi-fi audio, motor control, and power
conversion. It also allows the use of standard Power on Reset
(POR) circuits, common in microcontroller applications, as the
means of ensuring the output of the device is in the same state as
the input a short time after power up. Figure 1 shows a practical
Power on Reset circuit. Decoupling capacitors are omitted for clarity.
If multiple devices are used on a board and the designer wants to
use the refresh clock in continuous mode, the external clock signal
can be provided to each IL5xx Isolator, without the beat-frequency
noise problems inherent with competing isolator technologies.
The IL510 and IL515 have the SYNC function available to the
user. The IL511, IL514, and IL516 are available in continuous
clocking mode only (the user cannot turn off the refresh clock on
those devices).
T
threshold. Alternatively, on certain models the user can supply
SET
Fig. 1. Typical Power On Reset Circuit for IL510
POR
SYNC
V
IN
dd1
1
2
3
4
DD
pins.
IL510
8
7
6
5
V
OE
OUT
V
dd2