Preliminary
Functional Diagram
IL260
1
IN
Galvanic Isolation
IL26X
I
SO
L
OOP
®
High Speed Five Channel Digital Coupler
Features
1
OUT
2
OUT
3
OUT
4
OUT
5
OUT
2
IN
3
IN
4
IN
5
IN
·
5V CMOS/TTL Compatible
·
High Speed: 110 MBaud
·
2500 V
RMS
Isolation (1 min)
·
2 ns Typical Pulse Width Distortion
·
4 ns Typical Propagation Delay Skew
·
10 ns Typical Propagation Delay
·
30 kV/µs Typical Transient Immunity
·
2 ns Channel to Channel Skew
·
0.3'' and 0.15'' 16–Pin SOIC Packages
·
Extended Temperature Range (-40°C to +85°C)
·
UL1577 Approval Pending
·
IEC 61010-1 Approval Pending
Isolation Applications
IL261
1
IN
Galvanic Isolation
1
OUT
2
OUT
3
OUT
4
OUT
5
IN
2
IN
3
IN
4
IN
5
OUT
·
ADCs and DACs
·
Multiplexed Data Transmission
·
Data Interfaces
·
Board-To-Board Communication
·
Digital Noise Reduction
·
Operator Interface
·
Ground Loop Elimination
·
Peripheral Interfaces
·
Parallel Bus
·
Logic Level Shifting
·
Plasma Displays
Description
NVE's family of high-speed digital isolators are CMOS devices created
by integrating active circuitry and our GMR-based and patented
*
IsoLoop
®
technology. The IL260 and IL261 are five channel versions of
the world's fastest digital isolator with a 110 Mbaud data rate. These
devices provide the designer with the most compact isolated logic
devices yet available. All transmit and receive channels operate at 110
Mbd over the full temperature and supply voltage range. The symmetric
magnetic coupling barrier provides a typical propagation delay of only
10 ns and a pulse width distortion of 2 ns achieving the best
specifications of any isolator device. Typical transient immunity of 30
kV/µs is unsurpassed. The IL260 has five transmit channels, while the
IL261 has four transmit channels and one receive channel. Their high
channel density make them ideally suited to isolating multiple ADCs
and DACs, parallel buses and peripheral interfaces.
Performance is specified over the temperature range of -40°C to +85°C
without any derating.
Isoloop
®
is a registered trademark of NVE Corporation
* US Patent number 5,831,426; 6,300,617 and others.
RHOPOINT COMPONENTS
Hurst Green, Oxted, Surrey RH8 9AX UK
Telephone: +44 (0) 870 608 1188
Fax: +44 (0) 870 241 2255
Internet: www.rhopointcomponents.com
IL26X
Parameters
Storage Temperature
Supply Voltage
Input Voltage
Output Voltage
Output Current Drive Channel
I
SO
L
OOP
®
Preliminary
Symbol
T
S
T
A
Min.
-55
-55
-0.5
-0.5
-0.5
Max.
175
125
7
V
DD
+0.5
V
DD
+0.5
10
280
2kV Human Body Model
Units
o
C
o
Absolute Maximum Ratings
Ambient Operating Temperature
(1)
C
V
DD
1,V
DD
2
V
I
V
O
I
O
Volts
Volts
Volts
mA
o
Lead Solder Temperature (10s)
ESD
C
Recommended Operating Conditions
Parameters
Ambient Operating Temperature
Supply Voltage (5.0 V operation)
Logic High Input Voltage
Logic Low Input Voltage
Minimum Signal Rise and Fall Times
Symbol
T
A
V
DD
1,V
DD
2
V
IH
V
IL
t
IR
,t
IF
Min.
-40
4.5
2.4
0
Max.
85
5.5
V
DD
0.8
1
Units
o
C
Volts
Volts
Volts
µsec
Insulation Specifications
Parameter
Barrier Impedance
Creepage Distance (External)
Leakage Current
Symbol
Min
8.077 (0.3'' SOIC)
4.026 (0.15'' SOIC)
0.2
Typ.
Max.
>10
14
||7
Units
mm
µA
240 V
RMS
Test Condition
Ω ||
pF
Package Characteristics
Parameter
Capacitance (Input-Output)
(5)
Thermal Resistance
0.15'' 16-Pin SOIC
0.30'' 16-Pin SOIC
Package Power Dissipation
Symbol
C
I
-
O
θ
JCT
Min.
Typ.
4.0
40
28
65
Max.
Units
pF
o
C/W
Test Conditions
f= 1MHz
Thermocouple located at
center underside of package
f= 1MHz ,V
DD
=5V
P
PD
mW
IEC61010-1*
TUV Certificate Numbers: Pending
Classification as Table 1.
Model
IL260, IL261
IL260-3, IL261-3
Pollution
Degree
II
II
Material
Group
III
III
Max Working
Voltage
300 V
RMS
150 V
RMS
Package Type
16–SOIC (0.3'') 16–SOIC (0.15'')
UL 1577*
Component Recognition program. File # Pending
Rated 2500Vrms for 1min.
* UL & IEC approval is pending for the these parts.
2
RHOPOINT COMPONENTS
Hurst Green, Oxted, Surrey RH8 9AX UK
Telephone: +44 (0) 870 608 1188
Fax: +44 (0) 870 241 2255
Internet: www.rhopointcomponents.com
Preliminary
Electrical Specifications
Electrical Specifications are Tmin to Tmax
Parameter
DC Specifications
Input Quiescent Supply Current
IL260
IL261
Output Quiescent Supply Current
IL260
IL261
Logic Input Current
Logic High Output Voltage
Symbol
I
DD
1
I
DD
1
I
DD
2
I
DD
2
I
I
V
OH
0.8*V
DD
Logic Low Output Voltage
Switching Parameters
Maximum Data Rate
Minimum Pulse Width
Propagation Delay
Input to Output (High to Low)
Propagation Delay
Input to Output (Low to High)
Pulse Width Distortion
(2)
| tPHL- tPLH |
Propagation Delay Skew
(3)
Output Rise Time (10-90%)
Output Fall Time (10-90%)
Common Mode Transient
Immunity (Output Logic High
or Logic Low)
(4)
Channel to Channel Skew
Dynamic Power Consumption
6
PW
t
PHL
t
PLH
PWD
t
PSK
t
R
t
F
|CMH|
20
|CML|
t
CSK
30
2
170
3
210
kV/µs
ns
µA/mHz
V
OL
0.5
-10
V
DD
-0.1
V
DD
-0.5
0
0.8
100
10
10
10
2
4
1
1
15
15
3
6
3
3
110
MBd
ns
ns
ns
ns
ns
ns
ns
0.1
V
V
DD
5.0 Volt Specifications
Min.
Typ.
Max.
30
2.5
10
8
40
3.0
15
12
10
V
Units
µA
mA
mA
mA
µA
IL26X
Test Conditions
I
SO
L
OOP
®
I
O
=-20
µA,
V
I
=V
IH
I
O
= -4 mA, V
I
=V
IH
I
O
= 20
µA,
V
I
=V
IL
I
O
= 4 mA, V
I
=V
IL
C
L
= 15 pF
50% points, V
O
C
L
= 15 pF
C
L
= 15 pF
C
L
= 15 pF
C
L
= 15 pF
C
L
= 15 pF
C
L
= 15 pF
Vcm = 300V
C
L
= 15 pF
per Channel
Notes:
1.
Absolute Maximum ambient operating temperature means the
device will not be damaged if operated under these conditions. It
does not guarantee performance.
PWD is defined as | t
PHL
– t
PLH
|. %PWD is equal to the PWD
divided by the pulse width.
t
PSK
is equal to the magnitude of the worst case difference in t
PHL
and/or t
PLH
that will be seen between units at 25
O
C.
CM
H
is the maximum common mode voltage slew rate that can be
sustained while maintaining V
O
> 0.8 V
DD
. CM
L
is the maximum
common mode input voltage that can be sustained while
maintaining V
O
< 0.8 V. The common mode voltage slew rates
apply to both rising and falling common mode voltage edges.
Device is considered a two terminal device:
pins 1-8 shorted and pins 9-16 shorted.
Dynamic power consumption numbers are calculated per channel.
2.
3.
4.
5.
6.
3
RHOPOINT COMPONENTS
Hurst Green, Oxted, Surrey RH8 9AX UK
Telephone: +44 (0) 870 608 1188
Fax: +44 (0) 870 241 2255
Internet: www.rhopointcomponents.com
IL26X
Application Notes:
I
SO
L
OOP
®
Preliminary
Data Transmission Rates
The reliability of a transmission system is directly related to the
accuracy and quality of the transmitted digital information. For a
digital system, those parameters which determine the limits of the
data transmission are
pulse width distortion
and
propagation delay
skew.
Propagation delay is the time taken for the signal to travel through
the device. This is usually different when sending a low-to-high
than when sending a high-to-low signal. This difference, or error,
is called pulse width distortion (PWD) and is usually in ns. It may
also be expressed as a percentage:
PWD% = Maximum Pulse Width Distortion (ns)
Signal Pulse Width (ns)
For example:
For data rates of 12.5 Mb
PWD% =
3 ns
80 ns
x 100% =
3.75%
x 100%
Dynamic Power Consumption
Isoloop
devices achieve their low power consumption from the
manner by which they transmit data across the isolation barrier. By
detecting the edge transitions of the input logic signal and
converting these to narrow current pulses, a magnetic field is
created around the GMR Wheatstone bridge. 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 2.5ns wide, the power
consumption is independent of mark-to-space ratio and solely
dependent on frequency. This has obvious advantages over
optocouplers whose power consumption is heavily dependent on
its on-state and frequency.
The approximate power supply current per channel for
Power Supply Decoupling
Both power supplies to these devices should be decoupled with
low ESR 100 nF ceramic capacitors. For data rates in excess of
10MBd, use of ground planes for both GND1 and GND2 is highly
recommended. Capacitors should be located as close as possible to
the device.
This figure is almost
three times
better than for any available
optocoupler with the same temperature range, and
two times
better
than any optocoupler regardless of published temperature range.
The
IsoLoop
®
range of isolators will run at almost 35 Mb before
reaching the 10% limit.
Propagation delay skew is the difference in time taken for two or
more channels to propagate their signals. This becomes significant
when clocking is involved since it is undesirable for the clock
pulse to arrive before the data has settled. A short propagation
delay skew is therefore critical, especially in high data rate parallel
systems, to establish and maintain accuracy and repeatability. The
IsoLoop
®
range of isolators all have a maximum propagation delay
skew of 6 ns, which is
five times
better than any optocoupler. The
maximum channel to channel skew in the IsoLoop
®
coupler is only
3 ns which is
ten times
better than any optocoupler.
Signal Status on Start-up and Shut Down
To minimize power dissipation, the 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 the inclusion
of an initialization signal in his start-up circuit. Initialization
consists of toggling each channel either high then low or low then
high, depending on the desired state.
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.
4
RHOPOINT COMPONENTS
Hurst Green, Oxted, Surrey RH8 9AX UK
Telephone: +44 (0) 870 608 1188
Fax: +44 (0) 870 241 2255
Internet: www.rhopointcomponents.com
Preliminary
Applications:
Figure 1 Single Channel
∆Σ
Bridge
Bias
Delta Sigma A/D
CS5532
IL26X
I
SO
L
OOP
®
Bridge +
Bridge -
Isolation
Boundary
Figure 1 shows a typical single channel
∆Σ
ADC
application. The A/D is located on the bridge with no
signal conditioning electronics between the bridge sensor
and the ADC. In this application, 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.
Serial Data Out
Serial Data In
Data Clock
Chip Select
Iso SD Out
Iso DS In
Iso Data Clock
Iso CS
Clock
Generator
OSC 2
IL717
Figure 2 Multi Channel
∆Σ
Bridge
Bias
Delta Sigma A/D
CS5532
Bridge +
Bridge -
Isolation
Boundary
Serial Data Out
Serial Data In
Data Clock
Chip Select
Channel #1
Iso SD Out
Iso DS In
Iso Data Clock
Iso CS
Clock
Generator
The second
∆Σ
application is where multiple ADC's are
configured in a channel-to-channel isolation configuration.
The problem for designers is how to control clock jitter
and edge placement accuracy of the system clock for each
ADC. The best solution is to use a single clock on the
system side and distribute this to each ADC. The IL261
adds a 5th channel to the IL717. This 5th channel is used
to distribute a single, isolated clock to multiple ADC's as
shown in Figure 2.
IL261
OSC 2
Bridge
Bias
Delta Sigma A/D
CS5532
Bridge +
Bridge -
Serial Data Out
Serial Data In
Channel #n
Data Clock
Chip Select
Iso SD Out
Iso DS In
Iso Data Clock
Iso CS
IL261
OSC 2
5
RHOPOINT COMPONENTS
Hurst Green, Oxted, Surrey RH8 9AX UK
Telephone: +44 (0) 870 608 1188
Fax: +44 (0) 870 241 2255
Internet: www.rhopointcomponents.com
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