LTM2882IY-3#PBF [Linear]
LTM2882 - Dual Isolated RS232 uModule Transceiver + Power; Package: BGA; Pins: 32; Temperature Range: -40°C to 85°C;型号: | LTM2882IY-3#PBF |
厂家: | Linear |
描述: | LTM2882 - Dual Isolated RS232 uModule Transceiver + Power; Package: BGA; Pins: 32; Temperature Range: -40°C to 85°C 驱动 接口集成电路 驱动器 |
文件: | 总22页 (文件大小:670K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LTM2882
Dual Isolated RS232
µModule Transceiver + Power
DESCRIPTION
FEATURES
The LTM®2882 is a complete galvanically isolated dual
RS232 µModule® (micromodule)transceiver. No external
components are required. A single 3.3V or 5V supply
powers both sides of the interface through an integrated,
isolated DC/DC converter. A logic supply pin allows easy
interfacing with different logic levels from 1.62V to 5.5V,
independent of the main supply.
n
RS232 Transceiver: 2500V
for 1 Minute
RMS
File #E151738
n
UL-CSA Recognized
n
CSA Component Acceptance Notice 5A
Isolated DC Power: 5V at Up to 200mA
No External Components Required
1.62V to 5.5V Logic Supply for Flexible Digital
Interfacing
n
n
n
n
High Speed Operation
Coupled inductors and an isolation power transformer
1Mbps for 250pF/3kΩ Load
250kbps for 1nF/3kΩ Load
provide2500V
ofisolationbetweenthelinetransceiver
RMS
and the logic interface. This device is ideal for systems
with different grounds, allowing for large common mode
voltages. Uninterrupted communication is guaranteed for
common mode transients greater than 30kV/μs.
100kbps for 2.5nF/3kΩ TIA/EIA-232-F Load
3.3V (LTM2882-3) or 5V (LTM2882-5) Operation
No Damage or Latchup to 10kV ꢀHM ESD on
Isolated RS232 Interface or Across Isolation Harrier
ꢀigh Common Mode Transient Immunity: 30kV/μs
n
n
n
n
n
n
This part is compatible with the TIA/EIA-232-F standard.
Driver outputs are protected from overload and can be
shorted to ground or up to 15V without damage. An
auxiliary isolated digital channel is available. This channel
allows configuration for half-duplex operation by control-
ling the DE pin.
Maximum Continuous Working Voltage: 560V
True RS232 Compliant Output Levels
15mm × 11.25mm HGA and LGA Packages
PEAK
APPLICATIONS
n
Isolated RS232 Interface
Enhanced ESD protection allows this part to withstand up
to 10kV(humanbodymodel)onthetransceiverinterface
pins to isolated supplies and across the isolation barrier
to logic supplies without latchup or damage.
n
Industrial Communication
n
Test and Measurement Equipment
Hreaking RS232 Ground Loops
n
All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION
Isolated Dual RS232 µModule Transceiver
1Mbps Operation
ꢉ.ꢉꢊ ꢋLTM2882ꢌꢉꢍ
ꢎꢊ ꢋLTM2882ꢌꢎꢍ
Tꢄꢍ
ꢐꢅ/ꢃꢄꢅ
ꢊ
ꢊ
ꢏꢏ
LTM2882
L
ꢊ
ꢎꢊ
ꢏꢏ2
ꢅꢓ
ꢀꢊꢀꢆLꢀꢒLꢓ ꢏꢈꢇꢇꢓꢄTꢔ
ꢂꢎꢁmꢀ ꢋLTM2882ꢌꢎꢍ
ꢂꢁꢁmꢀ ꢋLTM2882ꢌꢉꢍ
ꢃFF ꢃꢄ
ꢃꢄ
TꢓꢈꢉT/ꢆꢓꢄꢍ
ꢓꢁꢅ/ꢃꢄꢅ
ꢅꢆꢄ
ꢅꢃꢈT
TꢂꢃꢈT
ꢇꢂꢆꢄ
T2ꢈꢉT/ꢆ2ꢄꢍ
Tꢂꢆꢄ
ꢆꢓꢈꢉT
ꢐꢅ/ꢃꢄꢅ
ꢆ2ꢈꢉT
ꢇꢂꢃꢈT
T2ꢆꢄ
T2ꢃꢈT
ꢇ2ꢆꢄ
2882 Tꢎꢁꢓꢔ
ꢀꢁꢁnꢂ/ꢃꢄꢅ
ꢇ2ꢃꢈT
ꢃꢆꢄꢅꢇꢆ ꢈꢉTꢊꢉTꢋ Tꢄꢇꢃ Tꢈ ꢆꢇꢌꢇꢄꢅꢇꢆ ꢄꢍꢊꢉTꢋ
TꢈꢉT Lꢈꢎꢃ ꢏ 2ꢐꢁꢑF ꢒ ꢆꢄꢍ
ꢆꢈꢉT Lꢈꢎꢃ ꢏ ꢓꢐꢁꢑF
ꢐꢄꢅ
ꢐꢄꢅ2
2882 Tꢀꢁꢂa
2882fh
1
For more information www.linear.com/LTM2882
LTM2882
ABSOLUTE MAXIMUM RATINGS
PIN CONFIGURATION
(Note 1)
Tꢠꢒ ꢀꢉꢇꢛ
V
to GND .................................................. –0.3V to 6V
CC
ꢌ
2
ꢍ
ꢎ
ꢏ
ꢐ
ꢑ
8
V to GND .................................................... –0.3V to 6V
L
ꢀ
ꢀ
ꢁꢁ
ꢡ2ꢠꢢT
T2ꢉꢃ ꢡꢌꢠꢢT
Tꢌꢉꢃ ꢄꢉꢃ ꢠꢃ
L
V
CC2
to GND2............................................... –0.3V to 6V
ꢅ
ꢆ
ꢁ
ꢄ
ꢇ
F
Logic Inputs
T1IN, T2IN, ON, DIN to GND........–0.3V to (V + 0.3V)
L
CC2
ꢂꢃꢄ
DE to GND2.............................–0.3V to (V
Logic Outputs
+ 0.3V)
R1OUT, R2OUT to GND...............–0.3V to (V + 0.3V)
L
CC2
DOUT to GND2........................–0.3V to (V
Driver Output Voltage
T1OUT, T2OUT to GND2...........................–15V to 15V
Receiver Input Voltage
R1IN, R2IN to GND2 ............................... –25V to 25V
Operating Temperature Range (Note 4)
+ 0.3V)
ꢂ
ꢈ
ꢉ
ꢊ
LTM2882C .........................................0°C ≤ T ≤ 70°C
A
ꢂꢃꢄ2
ꢋ
L
LTM2882I ..................................... –40°C ≤ T ≤ 85°C
A
LTM2882ꢀ.................................. –40°C ≤ T ≤ 105°C
A
Maximum Internal Operating Temperature............ 125°C
Storage Temperature Range .................. –40°C to 125°C
Peak Package Hody Reflow Temperature .............. 245°C
ꢡ2ꢉꢃ
ꢀ
ꢁꢁ2
T2ꢠꢢT ꢡꢌꢉꢃ TꢌꢠꢢT ꢄꢠꢢT ꢄꢇ
ꢆꢂꢅ ꢒꢅꢁꢋꢅꢂꢇ
ꢍ2ꢓꢒꢉꢃ ꢔꢌꢏmm × ꢌꢌ.2ꢏmm × ꢍ.ꢎ2mmꢕ
ꢗ ꢌ2ꢏꢘꢁꢙ
Lꢂꢅ ꢒꢅꢁꢋꢅꢂꢇ
ꢍ2ꢓꢒꢉꢃ ꢔꢌꢏmm × ꢌꢌ.2ꢏmm × 2.8mmꢕ
T
T
ꢗ ꢌ2ꢏꢘꢁꢙ
ꢊMꢅꢖ
ꢊMꢅꢖ
θ
ꢗ ꢍꢟꢘꢁ/ꢛꢙ θ
ꢗ 2ꢑ.8ꢘꢁ/ꢛꢙ
θ
ꢊꢅ
ꢗ 2ꢚꢘꢁ/ꢛꢙ θ
ꢗ 2ꢑ.ꢚꢘꢁ/ꢛꢙ
ꢊꢁtoꢜ
ꢊꢅ
ꢊꢁtoꢜ
θ
ꢗ ꢌꢚ.ꢍꢘꢁ/ꢛꢙ θ ꢗ 2ꢎꢘꢁ/ꢛꢙ
θ
ꢗ ꢌ8ꢘꢁ/ꢛꢙ θ ꢗ 22.ꢑꢘꢁ/ꢛꢙ
ꢛꢇꢉꢂꢈT ꢗ ꢌ.ꢌꢞ
ꢊꢁꢝottom
ꢊꢆ
ꢊꢁꢝottom
ꢊꢆ
ꢛꢇꢉꢂꢈT ꢗ ꢌ.ꢌꢞ
2882fh
2
For more information www.linear.com/LTM2882
LTM2882
ORDER INFORMATION
http://www.linear.com/product/LTM2882#orderinfo
PART MARKING
INPUT
VOLTAGE
PAD OR BALL
FINISH
PACKAGE
TYPE
MSL
RATING
PART NUMBER
DEVICE
FINISH CODE
TEMPERATURE RANGE
0°C to 70°C
LTM2882CY-3#PHF
LTM2882IY-3#PHF
LTM2882ꢀY-3#PHF
LTM2882CY-5#PHF
LTM2882IY-5#PHF
LTM2882ꢀY-5#PHF
LTM2882CV-3#PHF
LTM2882IV-3#PHF
LTM2882CV-5#PHF
LTM2882IV-5#PHF
3V to 3.6V
LTM2882Y-3
LTM2882Y-5
–40°C to 85°C
–40°C to 105°C
0°C to 70°C
SAC305
(RoꢀS)
e1
HGA
LGA
4.5V to 5.5V
–40°C to 85°C
–40°C to 105°C
0°C to 70°C
3
3V to 3.6V
LTM2882V-3
LTM2882V-5
–40°C to 85°C
0°C to 70°C
Au (RoꢀS)
e4
4.5V to 5.5V
–40°C to 85°C
• Device temperature grade is indicated by a label on the shipping
container.
• Recommended HGA and LGA PCH Assembly and Manufacturing
Procedures: www.linear.com/umodule/pcbassembly
• Pad or ball finish code is per IPC/JEDEC J-STD-609.
• Terminal Finish Part Marking: www.linear.com/leadfree
• LGA and HGA Package and Tray Drawings: www.linear.com/packaging
• This product is moisture sensitive. For more information, go to:
www.linear.com/umodule/pcbassembly
• This product is not recommended for second side reflow. For more
information, go to: www.linear.com/HGA-assy
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. LTM2882-3 VCC = 3.3V, LTM2882-5 VCC = 5.0V, VL = VCC, and GND =
GND2 = 0V, ON = VL unless otherwise noted.
SYMBOL
Supplies
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
l
l
l
l
l
V
Input Supply Range
LTM2882-3
LTM2882-5
3.0
4.5
3.3
5.0
3.6
5.5
5.5
10
V
V
CC
V
Logic Supply Range
Input Supply Current
1.62
V
L
I
ON = 0V
0
µA
mA
CC
LTM2882-3, No Load
LTM2882-5, No Load
24
17
30
l
25
mA
l
l
V
V
Regulated Output Voltage, Loaded
LTM2882-3 DE = 0V, I
LTM2882-5 DE = 0V, I
DE = 0, No Load
= 100mA
= 150mA
4.7
4.7
4.8
5.0
5.0
5.0
65
V
V
CC2
LOAD
LOAD
Regulated Output Voltage, No Load
Efficiency
5.35
V
CC2(NOLOAD)
I
= 100mA, LTM2882-5 (Note 2)
%
CC2
I
Output Supply Short-Circuit Current
200
mA
CC2
Driver
l
l
l
l
V
Driver Output Voltage Low
Driver Output Voltage ꢀigh
Driver Short-Circuit Current
R = 3kΩ
–5
5
–5.7
6.2
35
V
V
OLD
OꢀD
OSD
OZD
L
V
R = 3kΩ
L
I
I
V
, V
= 0V, V
= 5.5V
15V
70
10
mA
µA
T1OUT T2OUT
CC2
Driver Three-State (ꢀigh Impedance)
Output Current
DE = 0V, V
, V
=
0.1
T1OUT T2OUT
2882fh
3
For more information www.linear.com/LTM2882
LTM2882
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. LTM2882-3 VCC = 3.3V, LTM2882-5 VCC = 5.0V, VL = VCC, and GND =
GND2 = 0V, ON = VL unless otherwise noted.
SYMBOL
Receiver
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
l
l
l
V
Receiver Input Threshold
Input Low
Input ꢀigh
0.8
1.3
1.7
0.4
V
V
V
IR
2.5
1.0
V
ꢀYSR
Receiver Input ꢀysteresis
Receiver Input Resistance
0.1
3
l
R
–15V ≤ (V
, V ) ≤ 15V
5
7
kΩ
IN
R1IN R2IN
Logic
l
l
l
l
V
Logic Input Threshold Voltage
ON, T1IN, T2IN, DIN = 1.62V ≤ V < 2.35V
0.25•V
0.4
0.75•V
V
V
ITꢀ
L
L
L
ON, T1IN, T2IN, DIN = 2.35V ≤ V ≤ 5.5V
0.67•V
L
L
DE
0.4
0.67•V
1
V
CC2
I
Logic Input Current
µA
mV
INL
V
V
Logic Input ꢀysteresis
Logic Output ꢀigh Voltage
T1IN, T2IN, DIN (Note 2)
R1OUT, R2OUT
150
ꢀYS
Oꢀ
l
l
I
I
= –1mA (Sourcing), 1.62V ≤ V < 3.0V
V – 0.4
V
V
LOAD
LOAD
L
L
= –4mA (Sourcing), 3.0V ≤ V ≤ 5.5V
V – 0.4
L
L
l
DOUT, I
= –4mA (Sourcing)
V
– 0.4
CC2
V
LOAD
V
Logic Output Low Voltage
R1OUT, R2OUT
OL
l
l
I
I
= 1mA (Sinking), 1.62V ≤ V < 3.0V
0.4
0.4
V
V
LOAD
LOAD
L
= 4mA (Sinking), 3.0V ≤ V ≤ 5.5V
L
l
DOUT, I
= 4mA (Sinking)
0.4
V
LOAD
ESD (HBM) (Note 2)
RS232 Driver and Receiver Protection
(T1OUT, T2OUT, R1IN, R2IN) to (V , GND2)
10
10
10
kV
kV
kV
CC2
(T1OUT, T2OUT, R1IN, R2IN) to (V , V , GND)
CC
L
Isolation Houndary
(V , GND2) to (V , V , GND)
CC2 CC L
SWITCHING CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. LTM2882-3 VCC = 3.3V, LTM2882-5 VCC = 5.0V, VL = VCC, and GND =
GND2 = 0V, ON = VL unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
R = 3kΩ, C = 2.5nF (Note 3)
MIN
100
250
1000
10
TYP
MAX
UNITS
kbps
l
l
l
l
Maximum Data Rate
(T1IN to T1OUT, T2IN to T2OUT)
L
L
R = 3kΩ, C = 1nF (Note 3)
kbps
L
L
R = 3kΩ, C = 250pF (Note 3)
kbps
L
L
Maximum Data Rate (DIN to DOUT)
C = 15pF (Note 3)
L
Mbps
Driver
l
l
Driver Slew Rate (6V/t
or t
)
TLꢀ
R = 3kΩ, C = 50pF (Figure 1)
150
0.5
V/µs
µs
TꢀL
L
L
t
t
t
t
, t
Driver Propagation Delay
Driver Skew |t – t
R = 3kΩ, C = 50pF (Figure 1)
0.2
40
PꢀLD PLꢀD
L
L
|
R = 3kΩ, C = 50pF (Figure 1)
ns
SKEWD
PꢀLD
PLꢀD
L
L
l
l
, t
Driver Output Enable Time
Driver Output Disable Time
DE = ↑ , R = 3kΩ, C = 50pF (Figure 2)
0.6
0.3
2
2
µs
PZꢀD PZLD
L
L
, t
DE = ↓ , R = 3kΩ, C = 50pF (Figure 2)
µs
PꢀZD PLZD
L
L
2882fh
4
For more information www.linear.com/LTM2882
LTM2882
SWITCHING CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. LTM2882-3 VCC = 3.3V, LTM2882-5 VCC = 5.0V, VL = VCC, and GND =
GND2 = 0V, ON = VL unless otherwise noted.
SYMBOL
Receiver
PARAMETER
CONDITIONS
MIN
TYP
MAX
0.4
UNITS
l
l
t
t
t
, t
Receiver Propagation Delay
C = 150pF (Figure 3)
L
0.2
40
60
µs
ns
ns
PꢀLR PLꢀR
Receiver Skew |t
– t
PLꢀR
|
C = 150pF (Figure 3)
L
SKEWR
PꢀLR
, t
Receiver Rise or Fall Time
C = 150pF (Figure 3)
L
200
RR FR
Auxiliary Channel
l
l
t
, t
Propagation Delay
Rise or Fall Time
C = 15pF, t and t < 4ns (Figure 4)
60
60
100
200
ns
ns
PꢀLL PLꢀL
L
R
F
t
, t
C = 150pF (Figure 4)
L
RL FL
Power Supply
l
Power-Up Time
ON = ↑ to V
0.2
2
ms
CC2(MIN)
ISOLATION CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. LTM2882-3 VCC = 3.3V, LTM2882-5 VCC = 5.0V, VL = VCC, and GND =
GND2 = 0V, ON = VL unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
2500
4400
30
TYP
MAX
UNITS
V
ISO
Rated Dielectric Insulation Voltage
1 Minute, Derived from 1 Second Test
1 Second (Notes 5, 6)
V
RMS
V
Common Mode Transient Immunity
Maximum Working Insulation Voltage
V = ON = 3.3V, V = 1kV, ∆t = 33ns (Note 2)
L
kV/µs
CM
V
IORM
(Notes 2, 5)
560
400
V
PEAK
V
RMS
Partial Discharge
V
PR
= 1050 V
(Notes 2, 5)
5
pC
PEAK
CTI
DTI
Comparative Tracking Index
Depth of Erosion
Distance Through Insulation
IEC 60112 (Note 2)
IEC 60112 (Note 2)
(Note 2)
600
V
RMS
0.017
0.06
mm
mm
9
Input to Output Resistance
Input to Output Capacitance
Creepage Distance
(Notes 2, 5)
(Notes 2, 5)
(Notes 2, 5)
10
Ω
6
pF
9.48
mm
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 4: This device includes over-temperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above specified maximum operating junction
temperature may result in device degradation or failure.
Note 2: Guaranteed by design and not subject to production test.
Note 5: Tests performed from GND to GND2, all pins shorted each side of
isolation barrier.
Note 3: Maximum Data Rate is guaranteed by other measured parameters
and is not tested directly.
Note 6: The rated dielectric insulation voltage should not be interpreted as
a continuous voltage rating.
2882fh
5
For more information www.linear.com/LTM2882
LTM2882
TA = 25°C, LTM2882-3 VCC = 3.3V, LTM2882-5
TYPICAL PERFORMANCE CHARACTERISTICS
VCC = 5V, VL = 3.3V, and GND = GND2 = 0V, ON = VL unless otherwise noted.
VCC Supply Current vs Load
Capacitance (Dual Transceiver)
ꢎꢊꢊ
VCC Supply Current
vs Temperature
VCC Supply Current
vs Temperature
ꢎꢋ
2ꢊ
2ꢋ
ꢏꢊ
ꢏꢋ
ꢎꢋ
ꢏꢊ
ꢏꢋ
ꢊꢊ
ꢊꢋ
ꢐꢊ
ꢐꢋ
ꢑꢊ
ꢑꢋ
ꢍꢒ Lꢒꢃꢓ
ꢗꢊ
ꢌ
ꢔ ꢎ.ꢎꢌ
ꢇꢇ
LTM2882ꢕꢎ
2ꢏꢊꢐꢑꢒꢓꢔ LTM2882ꢕꢖ
ꢌ
ꢗ ꢑ.ꢑꢌ
ꢇꢇ
8ꢊ
ꢙꢊ
ꢚꢊ
ꢏꢊ
ꢘꢊ
ꢖꢊ
2ꢊ
LTM2882ꢝꢑ
ꢎꢊꢊꢐꢑꢒꢓꢔ LTM2882ꢕꢖ
ꢎꢗ.2ꢐꢑꢒꢓꢔ LTM2882ꢕꢖ
ꢌ
ꢔ ꢊ.ꢋꢌ
ꢇꢇ
LTM2882ꢕꢊ
ꢌ
ꢗ ꢊ.ꢋꢌ
ꢇꢇ
2ꢏꢊꢐꢑꢒꢓꢔ LTM2882ꢕꢏ
ꢎꢊꢊꢐꢑꢒꢓꢔ LTM2882ꢕꢏ
ꢎꢗ.2ꢐꢑꢒꢓꢔ LTM2882ꢕꢏ
LTM2882ꢝꢊ
TꢒꢔꢄT ꢃꢍꢕ T2ꢔꢄT
ꢖꢃꢄꢕ ꢗ ꢒꢋꢋꢘꢙꢚꢛ
ꢂ
L
ꢗ ꢑꢘꢜ ꢇ ꢗ 2.ꢊnF
L
ꢉꢊꢋ ꢉ2ꢊ
ꢋ
2ꢊ
ꢊꢋ
ꢑꢊ ꢏꢋꢋ ꢏ2ꢊ
ꢉꢊꢋ ꢉ2ꢊ
ꢋ
2ꢊ
ꢊꢋ
ꢎꢊ ꢒꢋꢋ ꢒ2ꢊ
ꢊ
ꢊ.ꢏ
ꢎ
ꢎ.ꢏ
2
2.ꢏ
TꢀMꢁꢀꢂꢃTꢄꢂꢀ ꢅꢆꢇꢈ
TꢀMꢁꢀꢂꢃTꢄꢂꢀ ꢅꢆꢇꢈ
Lꢀꢁꢂ ꢃꢁꢄꢁꢃꢅTꢁꢆꢃꢇ ꢈnFꢉ
2882 ꢐꢋꢏ
2882 ꢓꢋ2
2882 ꢛꢊꢖ
Receiver Input Threshold
vs Temperature
V
CC Supply Current vs Data Rate
Driver Slew Rate
(Dual Transceiver)
vs Load Capacitance
ꢒ.ꢋ
2.ꢊ
2.ꢋ
ꢓ.ꢊ
ꢓ.ꢋ
ꢋ.ꢊ
ꢋ
ꢏꢐꢊ
ꢏ2ꢊ
ꢏꢊꢊ
8ꢊ
ꢑꢊ
ꢕꢊ
ꢒꢊ
ꢔꢊ
ꢖꢊ
2ꢊ
ꢓꢊ
ꢊ
ꢕ.ꢕꢋ ꢌ ꢔ ꢏnF
L
ꢔꢕꢁꢄT ꢌꢔꢑꢌ
ꢕ.ꢕꢋ ꢌ ꢔ 2ꢓꢊꢇF
L
ꢔꢕꢁꢄT Lꢎꢖ
FꢁLLꢅꢆꢗ
ꢍꢅꢋꢅꢆꢗ
ꢑꢊ
ꢓ.ꢊꢋ ꢌ ꢔ ꢏnF
L
ꢐꢊ
ꢓ.ꢊꢋ ꢌ ꢔ 2ꢓꢊꢇF
L
2ꢊ
ꢉꢊꢋ ꢉ2ꢊ
ꢋ
2ꢊ
ꢊꢋ
ꢗꢊ ꢓꢋꢋ ꢓ2ꢊ
ꢊ
2ꢊꢊ
ꢐꢊꢊ
ꢑꢊꢊ
8ꢊꢊ
ꢏꢊꢊꢊ
ꢊ
ꢓ
2
ꢖ
ꢔ
ꢒ
TꢀMꢁꢀꢂꢃTꢄꢂꢀ ꢅꢆꢇꢈ
ꢀꢁTꢁ ꢂꢁTꢃ ꢄꢅꢆꢇꢈꢉ
Lꢀꢁꢂ ꢃꢁꢄꢁꢃꢅTꢁꢆꢃꢇ ꢈnFꢉ
2882 ꢑꢋꢊ
2882 ꢒꢊꢐ
2882 ꢗꢊꢕ
Driver Disabled Leakage Current
vs Temperature at 15V
Driver Short-Circuit Current
vs Temperature
Receiver Output Voltage
vs Load Current
ꢊꢋ
ꢒꢊ
ꢒꢋ
ꢔꢊ
ꢔꢋ
2ꢊ
2ꢋ
ꢓꢊ
ꢓꢋ
ꢏꢋꢋꢋ
ꢏꢋꢋ
ꢏꢋ
ꢎ
ꢑ
ꢐ
ꢒ
2
ꢏ
ꢊ
ꢑ
ꢓ ꢏꢊꢑ
TꢒꢄT
ꢌ
ꢌ
ꢌ
ꢔ ꢑ.ꢑꢌ
L
L
L
ꢔ ꢒ.ꢒꢌ
ꢔ ꢏ.ꢎ2ꢌ
ꢌꢐꢑꢗꢐꢑꢖ
ꢏ
ꢌꢎꢄꢂꢇꢐꢑꢖ
ꢋ.ꢏ
ꢋ.ꢋꢏ
ꢋ.ꢋꢋꢏ
ꢉꢊꢋ ꢉ2ꢊ
ꢋ
2ꢊ
ꢊꢋ
ꢕꢊ ꢓꢋꢋ ꢓ2ꢊ
ꢉꢊꢋ ꢉ2ꢊ
ꢋ
2ꢊ
ꢊꢋ
ꢐꢊ ꢏꢋꢋ ꢏ2ꢊ
ꢊ
2
ꢐ
ꢎ
8
ꢏꢊ
TꢀMꢁꢀꢂꢃTꢄꢂꢀ ꢅꢆꢇꢈ
TꢀMꢁꢀꢂꢃTꢄꢂꢀ ꢅꢆꢇꢈ
Lꢀꢁꢂ ꢃꢄꢅꢅꢆꢇTꢈmꢁꢉ
2882 ꢖꢋꢕ
2882 ꢍꢋ8
2882 ꢍꢊꢓ
2882fh
6
For more information www.linear.com/LTM2882
LTM2882
TA = 25°C, LTM2882-3 VCC = 3.3V, LTM2882-5
TYPICAL PERFORMANCE CHARACTERISTICS
VCC = 5V, VL = 3.3V, and GND = GND2 = 0V, ON = VL unless otherwise noted.
Logic Input Threshold
vs VL Supply Voltage
VCC2 Output Voltage
vs Load Current
ꢏ.ꢐ
ꢏ.ꢋ
2.ꢐ
2.ꢋ
ꢑ.ꢐ
ꢑ.ꢋ
ꢋ.ꢐ
ꢋ
ꢍ.2
ꢍ.ꢒ
ꢍ.ꢊ
ꢎ.ꢑ
ꢎ.8
ꢎ.ꢐ
ꢎ.ꢏ
ꢎ.ꢍ
ꢋ
ꢃꢃ
ꢋ
ꢃꢃ
ꢔ ꢓ.ꢊꢋ Tꢀ ꢓ.ꢏ ꢕ LTM2882ꢖꢓ
ꢔ ꢎ.ꢍꢋ Tꢀ ꢍ.ꢍ ꢕ LTM2882ꢖꢍ
5.5V
ꢔꢕꢃꢂT ꢌꢔꢇꢌ
ꢔꢕꢃꢂT Lꢅꢖ
5.0V
3.3V
ꢓ.ꢊꢋ
3.6V
4.5V
ꢋ
ꢑ
2
ꢏ
ꢒ
ꢐ
ꢓ
ꢊ
ꢍꢊ
ꢒꢊꢊ
ꢒꢍꢊ
2ꢊꢊ
2ꢍꢊ
ꢓꢊꢊ
ꢀ
ꢁꢂꢃꢃLꢄ ꢀꢅLTꢆꢇꢈ ꢉꢀꢊ
Lꢀꢁꢂ ꢃꢄꢅꢅꢆꢇT ꢈmꢁꢉ
L
2882 ꢇꢑꢋ
2882 ꢌꢒꢒ
Driver Outputs Exiting Shutdown
Driver Outputs Enable/Disable
ꢈꢊ
TꢀꢈꢉT
ꢄꢌ ꢍ ꢄꢈꢉ ꢏ
2ꢄ/ꢂꢃꢄ
ꢅꢄ/ꢂꢃꢄ
ꢂꢋ
ꢄ
ꢍ ꢆ
ꢅꢊ
L
ꢇꢆ/ꢄꢅꢆ
TꢆꢇꢈT
T2ꢈꢉT
TꢀꢈꢉT
ꢄꢌ ꢍ ꢆ
T2ꢇꢈT
ꢎꢎ2
T2ꢈꢉT
2882 ꢋꢀ2
2882 ꢉꢆꢊ
ꢀꢁꢁꢂꢃ/ꢄꢅꢆ
2ꢀꢁ/ꢂꢃꢄ
Operating Through 35kV/µs
Common Mode Transients
Tꢆꢄꢇ
TꢆꢉꢊT ꢔ ꢈꢆꢄꢇ
ꢈꢆꢉꢊT
2ꢅ/ꢃꢄꢅ
2ꢅ/ꢃꢄꢅ
ꢋ
ꢀꢁꢁꢅ/ꢃꢄꢅ
2882 ꢒꢆꢓ
ꢀꢁnꢂ/ꢃꢄꢅ
ꢋ MꢊLTꢄꢌLꢍ ꢎꢏꢍꢍꢌꢎ ꢉF
ꢐꢉMMꢉꢇ Mꢉꢃꢍ TꢈꢑꢇꢎꢄꢍꢇTꢎ
2882fh
7
For more information www.linear.com/LTM2882
LTM2882
TA = 25°C, LTM2882-3 VCC = 3.3V, LTM2882-5
TYPICAL PERFORMANCE CHARACTERISTICS
VCC = 5V, VL = 3.3V, and GND = GND2 = 0V, ON = VL unless otherwise noted.
VCC2 Surplus Current
vs Temperature
V
CC2 Power Efficiency
ꢎꢋꢋ
2ꢊꢋ
2ꢋꢋ
ꢏꢊꢋ
ꢏꢋꢋ
ꢊꢋ
ꢑꢊ
ꢒꢊ
ꢔꢊ
ꢕꢊ
ꢓꢊ
2ꢊ
ꢖꢊ
ꢖ.2
ꢖ.ꢊ
LTM2882ꢘꢔ
ꢌ
ꢕ ꢊ.ꢋꢌ
ꢇꢇ
LTM2882ꢜꢊ
ꢊ.8
LTM2882ꢘꢓ
ꢊ.ꢒ
ꢊ.ꢕ
ꢊ.2
ꢌ
ꢕ ꢎ.ꢎꢌ
LTM2882ꢜꢎ
ꢇꢇ
TꢏꢒꢄT ꢃꢍꢓ T2ꢒꢄT
ꢔꢃꢄꢓ ꢕ ꢏꢋꢋꢖꢗꢘꢙ
ꢂ
ꢌ
ꢕ ꢎꢖꢚ ꢇ ꢕ 2.ꢊnF
L
ꢇꢇ2
L
ꢕ ꢛ.8ꢌ
T
ꢙ 2ꢔꢚꢃ
ꢁ
ꢋ
ꢊ
ꢉꢊꢋ ꢉ2ꢊ
ꢋ
2ꢊ
ꢊꢋ
ꢑꢊ ꢏꢋꢋ ꢏ2ꢊ
ꢊ
ꢔꢊ
ꢖꢊꢊ
ꢖꢔꢊ
2ꢊꢊ
2ꢔꢊ
ꢓꢊꢊ
TꢀMꢁꢀꢂꢃTꢄꢂꢀ ꢅꢆꢇꢈ
Lꢀꢁꢂ ꢃꢄꢅꢅꢆꢇT ꢈmꢁꢉ
2882 ꢐꢏꢊ
2882 ꢗꢖꢒ
VCC2 Load Step Response
VCC2 Ripple and Noise
2ꢁꢁmꢆ/ꢄꢅꢆ
ꢇꢁmꢈ/ꢄꢅꢆ
ꢀꢁꢁmꢆ/ꢄꢅꢆ
Tꢀꢅꢉ ꢊ 2ꢋꢁꢌꢍꢎꢃ
Tꢀꢏꢐ ꢑ T2ꢏꢐ ꢑ ꢒ ꢊ ꢓꢌ
L
2882 ꢇꢀꢈ
2882 ꢉꢀ8
ꢀꢁꢂꢃ/ꢄꢅꢆ
ꢀꢁꢁꢂꢃ/ꢄꢅꢆ
2882fh
8
For more information www.linear.com/LTM2882
LTM2882
TEST CIRCUITS
V
L
TIN
½V
L
0V
TOUT
t
t
PHLD
PLHD
C
TIN
R
L
V
L
OHD
3V
TOUT
0V
–3V
V
OLD
t , t ≤ 40ns
f
t
t
r
THL
TLH
2882 F01
Figure 1. Driver Slew Rate and Timing Measurement
V
CC2
0V
DE
TOUT
TOUT
½V
CC2
t
t
PHZD
PZHD
V
OHD
0 OR V
TOUT
L
5V
V
V
– 0.5V
– 0.5V
OHD
OLD
C
R
L
L
0V
0V
t
t
PLZD
DE
PZLD
t , t ≤ 40ns
r
f
–5V
V
OLD
2882 F02
Figure 2. Driver Enable/Disable Times
3V
RIN
1.5V
ROUT
–3V
t
t
PLHR
PHLR
C
RIN
t , t ≤ 40ns
L
V
OH
10%
90%
10%
ROUT
½V
L
r
f
90%
V
OL
t
FR
t
RR
2882 F03
Figure 3. Receiver Timing Measurement
ꢏ
L
ꢂꢃꢄ
ꢎꢏ
L
ꢀꢏ
ꢂꢅꢆT
t
t
ꢈꢉLL
ꢈLꢉL
ꢇ
ꢂꢃꢄ
L
ꢏ
ꢅꢉ
ꢍꢀꢌ
ꢋꢀꢌ
ꢋꢀꢌ
ꢍꢀꢌ
ꢂꢅꢆT
ꢎꢏ
ꢇꢇ2
ꢏ
ꢅL
t
ꢊL
t
FL
2882 Fꢀꢁ
Figure 4. Auxiliary Channel Timing Measurement
2882fh
9
For more information www.linear.com/LTM2882
LTM2882
PIN FUNCTIONS
LOGIC SIDE
ISOLATED SIDE
R2OUT (Pin A1): Channel 2 RS232 Inverting Receiver
Output. Controlled through isolation barrier from receiver
input R2IN. Under the condition of an isolation communi-
cation failure R2OUT is in a high impedance state.
GND2 (Pins K1-K7): Isolated Side Circuit Ground. These
pads should be connected to the isolated ground and/or
cable shield.
V
(PinsK8,L7-L8):IsolatedSupplyVoltageOutput.In-
CC2
T2IN (Pin A2): Channel 2 RS232 Inverting Driver Input.
A logic low on this input generates a high on isolated
output T2OUT. A logic high on this input generates a low
on isolated output T2OUT. Do not float.
ternallygeneratedfromV byanisolatedDC/DCconverter
CC
and regulated to 5V. Supply voltage for pins R1IN, R2IN,
DE, and DOUT. Internally bypassed to GND2 with 2.2µF.
R2IN (Pin L1): Channel 2 RS232 Inverting Receiver Input.
A low on isolated input R2IN generates a logic high on
R2OUT. A high on isolated input R2IN generates a logic
low on R2OUT. Impedance is nominally 5kΩ in receive
mode or unpowered.
R1OUT (Pin A3): Channel 1 RS232 Inverting Receiver
Output. Controlled through isolation barrier from receiver
input R1IN. Under the condition of an isolation communi-
cation failure R1OUT is in a high impedance state.
T1IN (Pin A4): Channel 1 RS232 Inverting Driver Input.
A logic low on this input generates a high on isolated
output T1OUT. A logic high on this input generates a low
on isolated output T1OUT. Do not float.
T2OUT (Pin L2): Channel 2 RS232 Inverting Driver
Output. Controlled through isolation barrier from driver
input T2IN. ꢀigh impedance when the driver is disabled
(DE pin is low).
DIN (Pin A5): General Purpose Non-Inverting Logic Input.
A logic high on DIN generates a logic high on isolated
output DOUT. A logic low on DIN generates a logic low
on isolated output DOUT. Do not float.
R1IN (Pin L3): Channel 1 RS232 Inverting Receiver Input.
A low on isolated input R1IN generates a logic high on
R1OUT. A high on isolated input R1IN generates a logic
low on R1OUT. Impedance is nominally 5kΩ in receive
mode or unpowered.
ON(PinA6):Enable. Enablespoweranddatacommunica-
tion through the isolation barrier. If ON is high the part is
enabled and power and communications are functional to
the isolated side. If ON is low the logic side is held in reset
and the isolated side is unpowered. Do not float.
T1OUT (Pin L4): Channel 1 RS232 Inverting Driver
Output. Controlled through isolation barrier from driver
input T1IN. ꢀigh impedance when the driver is disabled
(DE pin is low).
V (PinA7):LogicSupply.Interfacesupplyvoltageforpins
DOUT (Pin L5): General Purpose Non-Inverting Logic
Output. Logic output connected through isolation barrier
to DIN.
L
DIN,R2OUT,T2IN,R1OUT,T1IN,andON.Operatingvoltage
is 1.62V to 5.5V. Internally bypassed to GND with 2.2µF.
V
(Pins A8, B7-B8): Supply Voltage. Operating volt-
DE (Pin L6): Driver Output Enable. A low input forces
both RS232 driver outputs, T1OUTand T2OUT, into a high
impedance state. A high input enables both RS232 driver
outputs. Do not float.
CC
age is 3.0V to 3.6V for LTM2882-3, and 4.5V to 5.5V for
LTM2882-5. Internally bypassed to GND with 2.2µF.
GND (Pins B1-B6): Circuit Ground.
2882fh
10
For more information www.linear.com/LTM2882
LTM2882
BLOCK DIAGRAM
ꢐꢃ
ꢋꢇꢅ
ꢃ
ꢃ
ꢄꢄ2
ꢄꢄ
2.2ꢂF
2.2ꢂF
ꢃ
ꢅꢆꢁ2
ꢁꢇ
L
2.2ꢂF
ꢅꢆꢁ
ꢁꢈꢉT
ꢃ
ꢁꢁ
ꢁꢄ/ꢁꢄ
ꢄꢈꢆꢃꢇꢋTꢇꢋ
ꢃ
ꢇꢇ
ꢈꢆ
ꢁꢌꢆ
ꢃ
ꢃ
ꢁꢁ
TꢊꢈꢉT
ꢋꢊꢌꢆ
Tꢊꢌꢆ
ꢋꢊꢈꢉT
T2ꢌꢆ
ꢌꢍꢈLꢎTꢇꢁ
ꢄꢈMMꢉꢆꢌꢏ
ꢄꢎTꢌꢈꢆꢍ
ꢌꢍꢈLꢎTꢇꢁ
ꢄꢈMMꢉꢆꢌꢏ
ꢄꢎTꢌꢈꢆꢍ
ꢇꢇ
ꢐꢑ
ꢐꢑ
ꢌꢆTꢇꢋFꢎꢄꢇ
ꢌꢆTꢇꢋFꢎꢄꢇ
ꢃ
ꢁꢁ
T2ꢈꢉT
ꢋ2ꢌꢆ
ꢃ
ꢇꢇ
ꢋ2ꢈꢉT
2882 ꢀꢁ
2882fh
11
For more information www.linear.com/LTM2882
LTM2882
APPLICATIONS INFORMATION
Overview
ꢏ.ꢀꢌ Tꢂ ꢏ.ꢎꢌ LTM2882ꢐꢏ
ꢑ.ꢁꢌ Tꢂ ꢁ.ꢁꢌ LTM2882ꢐꢁ
ꢊꢃꢋ ꢌꢂLTꢊꢍꢉ FꢇꢂM
ꢆ.ꢎ2ꢌ Tꢂ ꢁ.ꢁꢌ
TheLTM2882µModuletransceiverprovidesagalvanically-
isolatedrobustRS232interface,poweredbyanintegrated,
regulated DC/DC converter, complete with decoupling
capacitors. The LTM2882 is ideal for use in networks
where grounds can take on different voltages. Isolation in
the LTM2882 blocks high voltage differences, eliminates
ground loops and is extremely tolerant of common mode
transients between grounds. Error-free operation is main-
tained through common mode events greater than 30kV/
μs providing excellent noise isolation.
ꢌ
ꢌ
ꢓꢓ
ꢌ
LTM2882
L
ꢓꢓ2
ꢄꢉ
ꢂꢃ
ꢄꢅꢃ
ꢄꢂꢈT
TꢆꢂꢈT
ꢇꢆꢅꢃ
Tꢆꢅꢃ
ꢉꢒTꢉꢇꢃꢊL
ꢄꢉꢌꢅꢓꢉ
ꢇꢆꢂꢈT
T2ꢅꢃ
T2ꢂꢈT
ꢇ2ꢅꢃ
ꢇ2ꢂꢈT
ꢍꢃꢄ
ꢍꢃꢄ2
µModule Technology
2882 Fꢀꢁ
The LTM2882 utilizes isolator µModule technology to
translate signals and power across an isolation barrier.
Signalsoneithersideofthebarrierareencodedintopulses
and translated across the isolation boundary using core-
less transformers formed in the µModule substrate. This
system, complete with data refresh, error checking, safe
shutdown on fail, and extremely high common mode im-
munity, provides a robust solution for bidirectional signal
isolation. The µModule technology provides the means
to combine the isolated signaling with our advanced dual
RS232transceiverandpowerfulisolatedDC/DCconverter
in one small package.
Figure 5. VCC and VL Are Independent
The internal power solution is sufficient to support the
transceiver interface at its maximum specified load and
data rate, and has the capacity to provide additional 5V
power on the isolated side V
and GND2 pins. V and
CC2
CC
V
are each bypassed internally with 2.2µF ceramic
CC2
capacitors.
V Logic Supply
L
A separate logic supply pin V allows the LTM2882 to in-
L
terface with any logic signal from 1.62V to 5.5V as shown
DC/DC Converter
in Figure 5. Simply connect the desired logic supply to V .
L
The LTM2882 contains a fully integrated isolated DC/DC
converter, including the transformer, so that no external
components are necessary. The logic side contains a full-
bridge driver, running at about 2Mꢀz, and is AC-coupled
to a single transformer primary. A series DC blocking
capacitor prevents transformer saturation due to driver
duty cycle imbalance. The transformer scales the primary
voltage, and is rectified by a full-wave voltage doubler.
This topology eliminates transformer saturation caused
by secondary imbalances.
There is no interdependency between V and V ; they
CC
L
may simultaneously operate at any voltage within their
specified operating ranges and sequence in any order. V
is bypassed internally by a 2.2µF capacitor.
L
Hot Plugging Safely
Caution must be exercised in applications where power is
plugged into the LTM2882’s power supplies, V or V ,
CC
L
due to the integrated ceramic decoupling capacitors. The
parasitic cable inductance along with the high Q char-
acteristics of ceramic capacitors can cause substantial
ringing which could exceed the maximum voltage ratings
and damage the LTM2882. Refer to Analog Devices Ap-
plication Note 88, entitled “Ceramic Input Capacitors Can
Cause Overvoltage Transients” for a detailed discussion
and mitigation of this phenomenon.
TheDC/DCconverterisconnectedtoalowdropoutregulator
(LDO) to provide a regulated low noise 5V output, V
.
CC2
An integrated boost converter generates a 7V V supply
DD
andachargepumped–6.3VV supply.V andV power
EE
DD
EE
the output stage of the RS232 drivers and are regulated
to levels that guarantee greater than 5V output swing.
2882fh
12
For more information www.linear.com/LTM2882
LTM2882
APPLICATIONS INFORMATION
Channel Timing Uncertainty
Driver Overvoltage and Overcurrent Protection
Multiplechannelsaresupportedacrosstheisolationbound-
ary by encoding and decoding of the inputs and outputs.
ThetechniqueusedassignsT1IN/R1INthehighestpriority
such that there is no jitter on the associated output chan-
nels T1OUT/R1OUT, only delay. This preemptive scheme
will produce a certain amount of uncertainty on T2IN/
R2IN to T2OUT/R2OUT and DIN to DOUT. The resulting
pulse width uncertainty on these low priority channels is
typically 6ns, but may vary up to about 40ns.
The driver outputs are protected from short-circuits to
any voltage within the absolute maximum range of 15V
relative to GND2. The maximum current is limited to no
more than 70mA to maintain a safe power dissipation and
prevent damaging the LTM2882.
Receiver Overvoltage and Open Circuit
The receiver inputs are protected from common mode
voltages of 25V relative to GND2.
Eachreceiverinput hasanominalinput impedanceof 5kΩ
relative to GND2. An open circuit condition will generate a
logic high on each receiver’s respective output pin.
Half-Duplex Operation
The DE pin serves as a low-latency driver enable for half-
duplex operation. The DE pin can be easily driven from
the logic side by using the uncommitted auxiliary digital
channel, DIN to DOUT. Each driver is enabled and disabled
in lessthan2µs, while each receiverremains continuously
active. This mode of operation is illustrated in Figure 6.
RF, Magnetic Field Immunity
The LTM2882 has been independently evaluated and has
successfully passed the RF and magnetic field immunity
testing requirements per European Standard EN 55024,
in accordance with the following test standards:
ꢊ.ꢊꢋ ꢌLTM2882ꢍꢊꢎ
ꢏꢋ ꢌLTM2882ꢍꢏꢎ
ꢋ
ꢂꢃ
ꢋ
ꢋ
LTM2882
L
ꢐꢐ
ꢐꢐ2
ꢄꢉ
EN 61000-4-3
EN 61000-4-8
EN 61000-4-9
Radiated, Radio-Frequency,
Electromagnetic Field Immunity
ꢄꢅꢃ
ꢄꢂꢈT
TꢆꢂꢈT
ꢇꢆꢅꢃ
ꢇ
ꢕ
T
ꢕ
Power Frequency
Magnetic Field Immunity
Tꢆꢅꢃ
ꢇꢆꢂꢈT
T2ꢅꢃ
Pulsed Magnetic Field Immunity
T2ꢂꢈT
ꢇ2ꢅꢃ
Tests were performed using an unshielded test card de-
signed per the data sheet PCH layout recommendations.
Specific limits per test are detailed in Table 1.
ꢇ2ꢂꢈT
ꢑꢃꢄ
ꢑꢃꢄ2
2882 Fꢀꢁ
Table 1
Figure 6. Half-Duplex Configuration Using DOUT to Drive DE
TEST
FREQUENCY
80Mꢀz to 1Gꢀz
1.4Mꢀz to 2Gꢀz
2Gꢀz to 2.7Gꢀz
50ꢀz and 60ꢀz
60ꢀz
FIELD STRENGTH
10V/m
EN 61000-4-3, Annex D
3V/m
1V/m
EN 61000-4-8, Level 4
EN 61000-4-8, Level 5
EN 61000-4-9, Level 5
*Non IEC Method
30A/m
100A/m*
1000A/m
Pulse
2882fh
13
For more information www.linear.com/LTM2882
LTM2882
APPLICATIONS INFORMATION
PCB Layout
antennastructurewhichcanradiatedifferentialvoltages
formed between GND and GND2. If ground planes are
used it is recommended to minimize their area, and
use contiguous planes as any openings or splits can
exacerbate RF emissions.
The high integration of the LTM2882 makes PCH layout
very simple. ꢀowever, to optimize its electrical isolation
characteristics, EMI, and thermal performance, some
layout considerations are necessary.
• For large ground planes a small capacitance (≤ 330pF)
from GND to GND2, either discrete or embedded within
the substrate, provides a low impedance current return
path for the module parasitic capacitance, minimizing
anyhighfrequencydifferentialvoltagesandsubstantially
reducing radiated emissions. Discrete capacitance will
notbeaseffectiveduetoparasiticESL.Inaddition,volt-
age rating, leakage, and clearance must be considered
for component selection. Embedding the capacitance
withinthePCHsubstrateprovidesanearidealcapacitor
and eliminates component selection issues; however,
the PCH must be 4 layers. Care must be exercised in
applying either technique to insure the voltage rating
of the barrier is not compromised.
• Under heavily loaded conditions V and GND current
CC
can exceed 300mA. Sufficient copper must be used
on the PCH to insure resistive losses do not cause the
supply voltage to drop below the minimum allowed
level. Similarly, the V
and GND2 conductors must
CC2
be sized to support any external load current. These
heavy copper traces will also help to reduce thermal
stress and improve the thermal conductivity.
• InputandOutputdecouplingisnotrequired,sincethese
components are integrated within the package. An ad-
ditional bulk capacitor with a value of 6.8µF to 22µF is
recommended. The high ESR of this capacitor reduces
boardresonancesandminimizesvoltagespikescaused
by hot plugging of the supply voltage. For EMI sensitive
applications,anadditionallowESLceramiccapacitorof
1µF to 4.7µF, placed as close to the power and ground
terminalsaspossible, isrecommended. Alternatively, a
numberofsmallervalueparallelcapacitorsmaybeused
to reduce ESL and achieve the same net capacitance.
The PCH layout in Figures 7a to 7e show the low EMI
demo board for the LTM2882. The demo board uses a
combination of EMI mitigation techniques, including both
embedded PCH bridge capacitance and discrete GND to
GND2 capacitors. Two safety rated type Y2 capacitors
are used in series, manufactured by Murata, part number
GA342QR7GF471KW01L. The embedded capacitor ef-
fectively suppresses emissions above 400Mꢀz, whereas
the discrete capacitors are more effective below 400Mꢀz.
• Do not place copper on the PCH between the inner col-
umnsofpads. Thisareamustremainopentowithstand
the rated isolation voltage.
• The use of solid ground planes for GND and GND2
is recommended for non-EMI critical applications to
optimize signal fidelity, thermal performance, and to
minimize RF emissions due to uncoupled PCH trace
conduction. The drawback of using ground planes,
where EMI is of concern, is the creation of a dipole
EMI performance is shown in Figure 8, measured using
a Gigahertz Transverse Electromagnetic (GTEM) cell and
method detailed in IEC 61000-4-20, “Testing and Mea-
surement Techniques – Emission and Immunity Testing
in Transverse Electromagnetic Waveguides.”
2882fh
14
For more information www.linear.com/LTM2882
LTM2882
APPLICATIONS INFORMATION
TECHNOLOGY
Figure 7a. Low EMI Demo Board Layout
Figure 7b. Low EMI Demo Board Layout (DC1747A), Top Layer
Figure 7c. Low EMI Demo Board Layout (DC1747A), Inner Layer 1
2882fh
15
For more information www.linear.com/LTM2882
LTM2882
APPLICATIONS INFORMATION
Figure 7d. Low EMI Demo Board Layout (DC1747A), Inner Layer 2
Figure 7e. Low EMI Demo Board Layout (DC1747A), Bottom Layer
ꢐꢋ
ꢘꢁTꢁꢅTꢙꢀ ꢚ ꢂꢛaꢜiꢝeaꢞ
ꢀ
ꢚ ꢕ2ꢋꢞꢈꢉ
ꢚ ꢓꢋꢋꢞꢈꢉ
ꢍꢟ
ꢍꢟ
ꢑꢋ
ꢒꢋ
ꢏ
ꢠꢟꢁꢁꢝ TꢡMꢁ ꢚ ꢕꢖꢜec
ꢓꢋ
2ꢋ
ꢕꢋ
ꢋ
ꢔꢕꢋ
ꢔ2ꢋ
ꢔꢓꢋ
ꢘꢅꢕꢖꢒꢖꢢꢣꢢ
ꢘꢅꢕꢖꢒꢖꢢꢣꢍ
ꢅꢡꢠꢝꢀ 22 ꢅLꢢꢠꢠ 8 LꢡMꢡT
ꢋ
ꢕꢋꢋ 2ꢋꢋ ꢓꢋꢋ ꢒꢋꢋ ꢑꢋꢋ ꢐꢋꢋ ꢖꢋꢋ 8ꢋꢋ ꢗꢋꢋꢕꢋꢋꢋ
Fꢀꢁꢂꢃꢁꢄꢅꢆ ꢇMꢈꢉꢊ
2882 Fꢋ8
Figure 8. Low EMI Demo Board Emissions
2882fh
16
For more information www.linear.com/LTM2882
LTM2882
TYPICAL APPLICATIONS
ꢊ.ꢊꢋ ꢌLTM2882ꢍꢊꢎ
ꢏꢋ ꢌLTM2882ꢍꢏꢎ
ꢋ
ꢋ
ꢐꢐ
LTM2882
L
ꢂꢃ
ꢄꢉ
ꢄꢅꢃ
ꢄꢂꢈT
ꢇ
T
ꢖ
ꢖ
Tꢆꢅꢃ
TꢆꢂꢈT
ꢇꢆꢅꢃ
ꢊ.ꢊꢒ
ꢊ.ꢊꢒ
ꢇꢆꢂꢈT
T2ꢅꢃ
T2ꢂꢈT
ꢇ2ꢅꢃ
ꢇ2ꢂꢈT
ꢑꢃꢄ
ꢑꢃꢄ2
2882 Fꢀꢁ
Figure 9. Single Line Dual Half-Duplex
Isolated Transceiver
ꢉ.ꢉꢊ ꢋLTM2882ꢌꢉꢍ
ꢎꢊ ꢋLTM2882ꢌꢎꢍ
ꢊ
L
ꢊ
ꢏꢏ
LTM2882
ꢂꢃ
ꢄꢈ
ꢄꢅꢃ
ꢄꢂꢇT
Tꢀꢅꢃ
TꢀꢂꢇT
ꢆꢀꢅꢃ
ꢆꢀꢂꢇT
T2ꢅꢃ
ꢉꢔ
ꢏ
L
T2ꢂꢇT
ꢆ2ꢅꢃ
ꢆ2ꢂꢇT
DATA RATE
(kbps)
C
(nF)
ꢐꢃꢄ
ꢐꢃꢄ2
L
2882 Fꢀꢁ
ꢀꢁꢁ
2ꢎꢁ
ꢎ
2
ꢀꢁꢁꢁ
ꢁ.ꢎ
Figure 10. Driving Larger Capacitive Loads
2882fh
17
For more information www.linear.com/LTM2882
LTM2882
TYPICAL APPLICATIONS
ꢍ.ꢍꢊ ꢎLTM2882ꢏꢍꢐ
ꢑꢊ ꢎLTM2882ꢏꢑꢐ
ꢋ.ꢋꢈ ꢌLTM2882ꢍꢋꢎ
ꢏꢈ ꢌLTM2882ꢍꢏꢎ
ꢀ.8ꢊ
ꢏꢈ
ꢅꢇꢊꢆLꢐTꢇꢃ
ꢊ
ꢁꢂ
ꢊ
ꢋꢋ
ꢈ
ꢁꢂ
ꢈ
ꢉꢉ
ꢈ
ꢉꢉ2
LTM2882
LTM2882
ꢀꢏꢑmꢐ ꢌLTM2882ꢍꢏꢎ
ꢀꢑꢑmꢐ ꢌLTM2882ꢍꢋꢎ
L
L
ꢁFF ꢁꢂ
ꢃꢇ
ꢃꢇ
ꢃꢄꢂ
ꢃꢁꢆT
ꢃꢄꢂ
ꢃꢁꢆT
Tꢀꢄꢂ
TꢀꢁꢆT
ꢅꢀꢄꢂ
Tꢀꢄꢂ
TꢀꢁꢆT
ꢅꢀꢄꢂ
ꢈꢉ
ꢅꢀꢁꢆT
T2ꢄꢂ
ꢅꢀꢁꢆT
T2ꢄꢂ
T2ꢁꢆT
ꢅ2ꢄꢂ
T2ꢁꢆT
ꢅ2ꢄꢂ
ꢅ2ꢁꢆT
ꢅ2ꢁꢆT
ꢌꢂꢃ
ꢌꢂꢃ2
ꢊꢂꢃ
ꢊꢂꢃ2
2882 Fꢀꢀ
2882 Fꢀ2
Figure 11. 1.8V Microprocessor Interface
Figure 12. Isolated 5V Power Supply
ꢍꢉ
ꢁ.ꢁꢉ ꢊLTM2882ꢋꢁꢌ
ꢍꢉ ꢊLTM2882ꢋꢍꢌ
ꢆꢈꢎꢇLꢏTꢈꢄ
ꢉ
ꢉ
ꢓꢓ
ꢉ
ꢓꢓ2
LTM2882
L
ꢂꢃ
ꢄꢈ
ꢄꢅꢃ
ꢄꢂꢇT
ꢂFF ꢂꢃ
Tꢀꢅꢃ
TꢀꢂꢇT
ꢆꢀꢅꢃ
ꢐꢉ
ꢑꢒꢅTꢓꢔꢈꢄ
ꢆꢀꢂꢇT
T2ꢅꢃ
T2ꢂꢇT
ꢆ2ꢅꢃ
ꢕꢖ.ꢁꢉ
ꢑꢒꢅTꢓꢔꢈꢄ
ꢆ2ꢂꢇT
ꢎꢃꢄ
ꢎꢃꢄ2
2882 Fꢀꢁ
ꢆꢈTꢇꢆꢃ
Figure 13. Isolated Multirail Power Supply
with Switched Outputs
2882fh
18
For more information www.linear.com/LTM2882
LTM2882
PACKAGE DESCRIPTION
Please refer to http://www.linear.com/product/LTM2882#packaging for the most recent package drawings.
ꢛ
ꢛ
/ / ꢧ ꢧ ꢧ
ꢛ
ꢎ . ꢎ ꢎ ꢏ
ꢕ . ꢅ ꢡ ꢏ
ꢅ . ꢑ ꢔ ꢏ
ꢔ . ꢥ ꢕ ꢏ
ꢔ . ꢥ ꢕ ꢏ
ꢔ . ꢔ ꢔ ꢔ
ꢅ . ꢑ ꢔ ꢏ
ꢕ . ꢅ ꢡ ꢏ
ꢎ . ꢎ ꢎ ꢏ
a a a
ꢛ
2882fh
19
For more information www.linear.com/LTM2882
LTM2882
PACKAGE DESCRIPTION
Please refer to http://www.linear.com/product/LTM2882#packaging for the most recent package drawings.
ꢔ
ꢟ ꢟ ꢟ
ꢔ
ꢎ . ꢎ ꢎ ꢏ
ꢘ . ꢅ ꢧ ꢏ
ꢅ . ꢑ ꢝ ꢏ
ꢝ . ꢕ ꢘ ꢏ
ꢝ . ꢕ ꢘ ꢏ
ꢅ . ꢑ ꢝ ꢏ
ꢘ . ꢅ ꢧ ꢏ
ꢎ . ꢎ ꢎ ꢏ
a a a
ꢔ
2882fh
20
For more information www.linear.com/LTM2882
LTM2882
REVISION HISTORY
REV
DATE
DESCRIPTION
PAGE NUMBER
A
3/10
Changes to Features
1
2, 15
2
Add HGA Package to Pin Configuration, Order Information and Package Description Sections
Changes to LGA Package in Pin Configuration Section
Update to Pin Functions
9
Update to RF, Magnetic Field Immunity Section
“PCH Layout Isolation Considerations” Section Replaced
ꢀ-Grade parts added. Reflected throughout the data sheet.
12
13
H
C
D
E
3/11
1/12
1-20
MP-Grade parts added. Reflected throughout the data sheet.
1-24
2
11/12 Storage temperature range updated.
5/14
Removed ꢀ-grade and MP-grade parts throughout the data sheet.
Reduced Maximum Internal Operating Temperature and Storage Temperature Range.
Added CTI and DTI parameters.
1-22
2
5
3
F
9/14
4/16
Revised Output Supply Short-Circuit Current (I
Added CSA information
)
CC2
G
1
3
Revised I (LTM2882-5) limit
CC
ꢀ
2/18
ꢀ-Grade parts added. Reflected throughout the data sheet.
1-22
2882fh
Information furnished by Analog Devices is believed to be accurate and reliable. ꢀowever, no responsibility is assumed by Analog
Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications
subject to change without notice. No licenseis grantedbyimplication orotherwiseunder anypatent or patent rights of Analog Devices.
21
LTM2882
TYPICAL APPLICATIONS
ꢔ.ꢔꢎ ꢕLTM2882ꢖꢔꢗ
ꢘꢎ ꢕLTM2882ꢖꢘꢗ
ꢌ.ꢌꢉ ꢍLTM2882ꢎꢌꢏ
ꢁꢉ ꢍLTM2882ꢎꢁꢏ
ꢀ.ꢐ2ꢉ Tꢂ ꢁ.ꢁꢉ
ꢂFF ꢂꢃ
ꢉ
L
ꢉ
ꢊꢊ
ꢎ
ꢂꢃ
ꢎ
ꢊꢊ
ꢎ
LTM2882
LTM2882
L
ꢊꢊ2
ꢄꢈ
ꢉꢊ
ꢋꢈꢆꢅꢋꢌꢈꢆꢍL
ꢂꢃ
ꢄꢈ
ꢄꢅꢃ
ꢄꢂꢇT
ꢄꢅꢃ
ꢄꢂꢇT
TꢀꢂꢇT
ꢆꢀꢅꢃ
Tꢀꢅꢃ
TꢀꢂꢇT
ꢆꢀꢅꢃ
Tꢀꢅꢃ
T ꢄ
ꢏ
ꢆ
ꢏ
ꢆꢀꢂꢇT
T2ꢅꢃ
ꢆ2ꢂꢇT
T2ꢅꢃ
ꢌꢉ Tꢂ 2ꢁꢉ
ꢌꢉ Tꢂ 2ꢁꢉ
ꢉ
ꢉ
L
L
ꢆ ꢄ
T
ꢏ
ꢏ
ꢔꢉ
ꢔꢉ
ꢕ2ꢁꢉ Tꢂ ꢔꢉ
ꢕ2ꢁꢉ Tꢂ ꢔꢉ
T2ꢂꢇT
ꢆ2ꢅꢃ
T2ꢂꢇT
ꢆ2ꢅꢃ
ꢋ
ꢆTꢐ
ꢊTꢐ
ꢑ
ꢆ2ꢂꢇT
ꢆ2ꢂꢇT
ꢋ
ꢒ
ꢋꢃꢄ
ꢋꢃꢄ2
ꢓꢃꢄ
ꢓꢃꢄ2
2882 Fꢀꢁ
2882 Fꢀꢁ
Figure 14. Isolated RS232 Interface with Handshaking
Figure 15. Isolated Dual Inverting Level Translator
ꢎ.ꢎꢉ ꢔLTM2882ꢕꢎꢖ
ꢗꢉ ꢔLTM2882ꢕꢗꢖ
ꢀꢏ
ꢌꢉ
ꢍ
ꢉ
ꢂꢃ
ꢉ
ꢊꢊ
ꢉ
LTM2882
L
ꢊꢊ2
ꢄꢈ
ꢄꢅꢃ
ꢄꢂꢇT
TꢀꢂꢇT
ꢆꢀꢅꢃ
ꢆꢈꢍꢈT
Tꢀꢅꢃ
ꢚꢛMꢘ
ꢚꢛMꢙ
Lꢂꢋꢅꢊ
LꢈꢉꢈL
FꢈTꢍ
ꢆꢀꢂꢇT
T2ꢅꢃ
FꢘꢇLT
T2ꢂꢇT
ꢆ2ꢅꢃ
ꢆ2ꢂꢇT
ꢅꢆLMLꢁꢐꢑ2
ꢅꢆLML2ꢐꢑ2
ꢋꢃꢄ
ꢋꢃꢄ2
ꢊMꢚT2ꢎꢁꢞꢕLTꢉ
ꢀꢏ
ꢎꢏ
ꢎꢏ
ꢐꢒꢑꢓF
ꢐꢒꢓF
ꢆ
ꢅLꢅM
ꢜ ꢑ.ꢁ/Mꢘꢝ ꢊꢇꢆꢆꢈꢃT
2882 Fꢀꢁ
Figure 16. Isolated Gate Drive with Overcurrent Detection
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
20Mbps, 15kV ꢀHM ESD, 2500V
LTM2881
Isolated RS485/RS422 µModule Transceiver with
Low EMI Integrated DC/DC Converter
Isolation with 1W Power
RMS
LTC2870/LTC2871 RS232/RS485 Multiprotocol Transceivers with
Integrated Termination
20Mbps RS485 and 500kbps RS232, 26kV ESD, 3V to 5V Operation
LTC2804
LTC1535
LTM2883
1Mbps RS232 Transceiver
Isolated RS485 Transceiver
Dual Channel, Full-Duplex, 10kV ꢀHM ESD
2500 V
2500 V
Isolation with External Transformer Driver
Isolation with Power in HGA Package
RMS
2
SPI/Digital or I C Isolated µModule with Adjustable
RMS
5V and 12V Rails
2
LTM2892
SPI/Digital or I C Isolated µModule
3500 V
Isolation, 6 Channels
RMS
2882fh
LT 0218 REV H • PRINTED IN USA
www.linear.com/LTM2882
22
ANALOG DEVICES, INC. 2010
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