20Mbps or 250kbps RS485/RS422 transceivers operating
on 3V to 5.5V supplies that feature ±60V overvoltage fault
protection on the data transmission lines during all modes
of operation, including power-down. Low EMI slew rate
limited data transmission is available in a logic-selectable
250kbps mode in the LTC2865 and in 250kbps versions of
the LTC2862-LTC2864. Enhanced ESD protection allows
these parts to withstand ±15kV HBM on the transceiver
interface pins without latchup or damage.
Extended ±25V input common mode range and full fail-
safe operation improve data communication reliability in
electrically noisy environments and in the presence of
large ground loop voltages.
n
n
n
n
n
Protected from Overvoltage Line Faults to ±60V
3V to 5.5V Supply Voltage
20Mbps or Low EMI 250kbps Data Rate
±15kV ESD Interface Pins, ±8kV All Other Pins
Extended Common Mode Range: ±25V
Guaranteed Failsafe Receiver Operation
High Input Impedance Supports 256 Nodes
1.65V to 5.5V Logic Supply Pin (V
L
) for Flexible
Digital Interface (LTC2865)
MP-Grade Option Available (–55°C to 125°C)
Fully Balanced Differential Receiver Thresholds for
Low Duty Cycle Distortion
Current Limited Drivers and Thermal Shutdown
Pin Compatible with LT1785 and LT1791
Available in DFN and Leaded Packages
applicaTions
n
n
n
n
n
n
proDucT selecTion GuiDe
PART
NUMBER
LTC2862-1
LTC2862-2
LTC2863-1
LTC2863-2
LTC2864-1
LTC2864-2
LTC2865
DUPLEX
HALF
HALF
FULL
FULL
FULL
FULL
FULL
ENABLES
YES
YES
NO
NO
YES
YES
YES
MAX DATA
RATE (bps)
20M
250k
20M
250k
20M
250k
20M/250k
V
L
PIN
NO
NO
NO
NO
NO
NO
YES
Supervisory Control and Data Acquisition (SCADA)
Industrial Control and Instrumentation Networks
Automotive and Transportation Electronics
Building Automation, Security Systems and HVAC
Medical Equipment
Lighting and Sound System Control
L,
LT, LTC, LTM, Linear Technology the Linear logo and µModule are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
Typical applicaTion
RS485 Link With Large Ground Loop Voltage
LTC2862
VCC1
RO1
RE1
DE1
DI1
D
V GROUND LOOP
≤25V PEAK
R
R
t
R
t
D
VCC2
R
RO2
RE2
DE2
DI2
LTC2862
LTC2865 Receiving 10Mbps ±200mV Differential
Signal with 1MHz ±25V Common Mode Sweep
A,B
A,B
50V/DIV
A-B
0.5V/DIV
A-B
GND1
GND2
2862345 TA01a
RO
5V/DIV
RO
100ns/DIV
2862345 TA01b
2862345fc
For more information
www.linear.com/LTC2862
1
LTC2862/LTC2863/
LTC2864/LTC2865
absoluTe MaxiMuM raTinGs
Supply Voltages
V
CC
............................................................. –0.3 to 6V
V
L
.............................................................. –0.3 to 6V
Logic Input Voltages (RE, DE, DI,
SLO)
.......... –0.3 to 6V
Interface I/O: A, B, Y, Z.............................. –60V to +60V
Receiver Output (RO)
(LTC2862-LTC2864) ...................–0.3V to (V
CC
+0.3V)
(Note 1)
Receiver Output (RO)
(LTC2865) ..................................–0.3V to (V
L
+ 0.3V)
Operating Ambient Temperature Range (Note 4)
LTC286xC ................................................ 0°C to 70°C
LTC286xI .............................................–40°C to 85°C
LTC286xH .......................................... –40°C to 125°C
LTC286xMP ....................................... –55°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
pin conFiGuraTion
LTC2862-1, LTC2862-2
TOP VIEW
RO 1
RE
2
DE 3
DI 4
8
7
6
5
V
CC
B
A
GND
RO
RE
DE
DI
1
2
3
4
9
LTC2862-1, LTC2862-2
TOP VIEW
8 V
CC
7 B
6 A
5 GND
S8 PACKAGE
8-LEAD (150mil) PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 150°C/W,
θ
JC
= 39°C/W
DD PACKAGE
8-LEAD (3mm
×
3mm) PLASTIC DFN
EXPOSED PAD (PIN 9) CONNECT TO PCB GND
T
JMAX
= 150°C,
θ
JA
= 43°C/W,
θ
JC
= 3°C/W
LTC2863-1, LTC2863-2
TOP VIEW
V
CC
1
RO 2
DI 3
GND 4
8
7
6
5
A
B
Z
Y
LTC2863-1, LTC2863-2
TOP VIEW
V
CC
RO
DI
GND
1
2
3
4
9
8 A
7 B
6 Z
5 Y
S8 PACKAGE
8-LEAD (150mil) PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 150°C/W,
θ
JC
= 39°C/W
DD PACKAGE
8-LEAD (3mm
×
3mm) PLASTIC DFN
EXPOSED PAD (PIN 9) CONNECT TO PCB GND
T
JMAX
= 150°C,
θ
JA
= 43°C/W,
θ
JC
= 3°C/W
LTC2864-1, LTC2864-2
TOP VIEW
NC 1
RO 2
RE
3
DE 4
DI 5
GND 6
GND 7
14 V
CC
13 NC
12 A
11 B
10 Z
9
8
Y
NC
LTC2864-1, LTC2864-2
TOP VIEW
RO
RE
DE
DI
GND
1
2
3
4
5
11
10 V
CC
9 A
8 B
7 Z
6 Y
S PACKAGE
14-LEAD (150mil) PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 88°C/W,
θ
JC
= 37°C/W
DD PACKAGE
10-LEAD (3mm
×
3mm) PLASTIC DFN
EXPOSED PAD (PIN 11) CONNECT TO PCB GND
T
JMAX
= 150°C,
θ
JA
= 43°C/W,
θ
JC
= 3°C/W
2862345fc
2
For more information
www.linear.com/LTC2862
LTC2862/LTC2863/
LTC2864/LTC2865
pin conFiGuraTion
LTC2865
TOP VIEW
RO
RE
DE
DI
V
L
GND
1
2
3
4
5
6
12
11
10
9
8
7
V
CC
A
B
Z
Y
SLO
RO
RE
DE
DI
V
L
GND
1
2
3
4
5
6
13
LTC2865
TOP VIEW
12 V
CC
11 A
10 B
9
8
7
Z
Y
SLO
13
MSE PACKAGE
12-LEAD PLASTIC MSOP
EXPOSED PAD (PIN 13) CONNECT TO PCB GND
T
JMAX
= 150°C,
θ
JA
= 40°C/W,
θ
JC
= 10°C/W
DE PACKAGE
12-LEAD (4mm
×
3mm) PLASTIC DFN
EXPOSED PAD (PIN 13) CONNECT TO PCB GND
T
JMAX
= 150°C,
θ
JA
= 43°C/W,
θ
JC
= 4.3°C/W
orDer inForMaTion
LEAD FREE FINISH
LTC2862CS8-1#PBF
LTC2862IS8-1#PBF
LTC2862HS8-1#PBF
LTC2862CS8-2#PBF
LTC2862IS8-2#PBF
LTC2862HS8-2#PBF
LTC2862CDD-1#PBF
LTC2862IDD-1#PBF
LTC2862HDD-1#PBF
LTC2862CDD-2#PBF
LTC2862IDD-2#PBF
LTC2862HDD-2#PBF
LTC2863CS8-1#PBF
LTC2863IS8-1#PBF
LTC2863HS8-1#PBF
LTC2863CS8-2#PBF
LTC2863IS8-2#PBF
LTC2863HS8-2#PBF
LTC2863CDD-1#PBF
LTC2863IDD-1#PBF
LTC2863HDD-1#PBF
LTC2863CDD-2#PBF
LTC2863IDD-2#PBF
LTC2863HDD-2#PBF
TAPE AND REEL
LTC2862CS8-1#TRPBF
LTC2862IS8-1#TRPBF
LTC2862HS8-1#TRPBF
LTC2862CS8-2#TRPBF
LTC2862IS8-2#TRPBF
LTC2862HS8-2#TRPBF
LTC2862CDD-1#TRPBF
LTC2862IDD-1#TRPBF
LTC2862HDD-1#TRPBF
LTC2862CDD-2#TRPBF
LTC2862IDD-2#TRPBF
LTC2862HDD-2#TRPBF
LTC2863CS8-1#TRPBF
LTC2863IS8-1#TRPBF
LTC2863HS8-1#TRPBF
LTC2863CS8-2#TRPBF
LTC2863IS8-2#TRPBF
LTC2863HS8-2#TRPBF
LTC2863CDD-1#TRPBF
LTC2863IDD-1#TRPBF
LTC2863HDD-1#TRPBF
LTC2863CDD-2#TRPBF
LTC2863IDD-2#TRPBF
LTC2863HDD-2#TRPBF
PART MARKING*
28621
28621
28621
28622
28622
28622
LFXK
LFXK
LFXK
LFXM
LFXM
LFXM
28631
28631
28631
28632
28632
28632
LFXN
LFXN
LFXN
LFXP
LFXP
LFXP
PACKAGE DESCRIPTION
8-Lead (150mil) Plastic SO
8-Lead (150mil) Plastic SO
8-Lead (150mil) Plastic SO
8-Lead (150mil) Plastic SO
8-Lead (150mil) Plastic SO
8-Lead (150mil) Plastic SO
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (150mil) Plastic SO
8-Lead (150mil) Plastic SO
8-Lead (150mil) Plastic SO
8-Lead (150mil) Plastic SO
8-Lead (150mil) Plastic SO
8-Lead (150mil) Plastic SO
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
2862345fc
For more information
www.linear.com/LTC2862
3
LTC2862/LTC2863/
LTC2864/LTC2865
orDer inForMaTion
LEAD FREE FINISH
LTC2864CS-1#PBF
LTC2864IS-1#PBF
LTC2864HS-1#PBF
LTC2864CS-2#PBF
LTC2864IS-2#PBF
LTC2864HS-2#PBF
LTC2864CDD-1#PBF
LTC2864IDD-1#PBF
LTC2864HDD-1#PBF
LTC2864CDD-2#PBF
LTC2864IDD-2#PBF
LTC2864HDD-2#PBF
LTC2865CMSE#PBF
LTC2865IMSE#PBF
LTC2865HMSE#PBF
LTC2865CDE#PBF
LTC2865IDE#PBF
LTC2865HDE#PBF
LTC2862MPS8-1#PBF
LTC2862MPS8-2#PBF
LTC2863MPS8-1#PBF
LTC2863MPS8-2#PBF
LTC2864MPS-1#PBF
LTC2864MPS-2#PBF
TAPE AND REEL
LTC2864CS-1#TRPBF
LTC2864IS-1#TRPBF
LTC2864HS-1#TRPBF
LTC2864CS-2#TRPBF
LTC2864IS-2#TRPBF
LTC2864HS-2#TRPBF
LTC2864CDD-1#TRPBF
LTC2864IDD-1#TRPBF
LTC2864HDD-1#TRPBF
LTC2864CDD-2#TRPBF
LTC2864IDD-2#TRPBF
LTC2864HDD-2#TRPBF
LTC2865CMSE#TRPBF
LTC2865IMSE#TRPBF
LTC2865HMSE#TRPBF
LTC2865CDE#TRPBF
LTC2865IDE#TRPBF
LTC2865HDE#TRPBF
LTC2862MPS8-1#TRPBF
LTC2862MPS8-2#TRPBF
LTC2863MPS8-1#TRPBF
LTC2863MPS8-2#TRPBF
LTC2864MPS-1#TRPBF
LTC2864MPS-2#TRPBF
PART MARKING*
LTC2864S-1
LTC2864S-1
LTC2864S-1
LTC2864S-2
LTC2864S-2
LTC2864S-2
LFXQ
LFXQ
LFXQ
LFXR
LFXR
LFXR
2865
2865
2865
2865
2865
2865
28621
28622
28631
28632
LTC2864S-1
LTC2864S-2
PACKAGE DESCRIPTION
14-Lead (150mil) Plastic SO
14-Lead (150mil) Plastic SO
14-Lead (150mil) Plastic SO
14-Lead (150mil) Plastic SO
14-Lead (150mil) Plastic SO
14-Lead (150mil) Plastic SO
10-Lead (3mm × 3mm) Plastic DFN
10-Lead (3mm × 3mm) Plastic DFN
10-Lead (3mm × 3mm) Plastic DFN
10-Lead (3mm × 3mm) Plastic DFN
10-Lead (3mm × 3mm) Plastic DFN
10-Lead (3mm × 3mm) Plastic DFN
12-Lead Plastic MSOP
12-Lead Plastic MSOP
12-Lead Plastic MSOP
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
8-Lead (150mm) Plastic SO
8-Lead (150mm) Plastic SO
8-Lead (150mm) Plastic SO
8-Lead (150mm) Plastic SO
14-Lead (150mm) Plastic SO
14-Lead (150mm) Plastic SO
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
–55°C to 125°C
–55°C to 125°C
–55°C to 125°C
–55°C to 125°C
–55°C to 125°C
–55°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
elecTrical characTerisTics
SYMBOL
Supplies
V
CC
V
L
I
CCS
Primary Power Supply
Logic Interface Power Supply
Supply Current in Shutdown Mode
(C-, I-Grade) (N/A LTC2863)
Supply Current in Shutdown Mode
(H-, MP-Grade) (N/A LTC2863)
I
CCTR
Supply Current with Both Driver and
Receiver Enabled (LTC2862-1, LTC2863-1,
LTC2864-1, LTC2865 with
SLO
High)
PARAMETER
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= V
L
= 3.3V unless otherwise noted. (Note 2)
CONDITIONS
l
MIN
3
1.65
TYP
MAX
5.5
V
CC
UNITS
V
V
µA
µA
µA
LTC2865 Only
DE = 0V,
RE
= V
CC
= V
L
DE = 0V,
RE
= V
CC
= V
L
No Load, DE = V
CC
= V
L
,
RE
= 0V
l
l
l
l
0
0
900
5
40
1300
2862345fc
4
For more information
www.linear.com/LTC2862
LTC2862/LTC2863/
LTC2864/LTC2865
elecTrical characTerisTics
SYMBOL
I
CCTRS
Driver
|V
OD
|
Differential Driver Output Voltage
R = ∞ (Figure 1)
R = 27Ω (Figure 1)
R = 50Ω (Figure 1)
Δ|V
OD
|
V
OC
Δ|V
OC
|
I
OSD
I
OZD
Receiver
I
IN
Receiver Input Current (A,B)
(C-, I-Grade LTC2863, LTC2864, LTC2865)
Receiver Input Current (A,B)
(H-, MP-Grade LTC2863, LTC2864,
LTC2865; C-, I-, H-, MP-Grade LTC2862)
R
IN
V
CM
V
TH
ΔV
TH
Receiver Input Resistance
Receiver Common Mode Input Voltage
(A + B)/2
Differential Input Signal Threshold
Voltage (A – B)
Differential Input Signal Hysteresis
Differential Input Failsafe Threshold Voltage
Differential Input Failsafe Hysteresis
V
OH
V
OL
I
OZR
I
OSR
Logic
V
TH
I
INL
Logic
V
TH
I
INL
Receiver Output High Voltage
–25V ≤ V
CM
≤ 25V
V
CM
= 0V
–25V ≤ V
CM
≤ 25V
V
CM
= 0V
I(RO) = –3mA (Sourcing)
V
L
≥ 2.25V, I(RO) = –3mA (LTC2865)
V
L
< 2.25V, I(RO) = –2mA (LTC2865)
I(RO) = 3mA (Sinking)
RE
= High, RO = 0V or V
CC
RO = 0V or V
L
(LTC2865)
RE
= Low, RO = 0V or V
CC
RO = 0V or V
L
(LTC2865)
3.0 ≤ V
CC
≤ 5.5V
0 ≤ V
IN
≤ V
CC
1.65V ≤ V
L
≤ 5.5V
0 ≤ V
IN
≤ V
L
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
我现在在研究2812的算法。
怎么也看不懂那个filter_module，很奇怪。比如：
/*----------------------------------------------------------------
Define the structure of the FIRFILT_G ......
主题：自备终端(BYOD)发展趋势;用员工自己的移动设备来控制对工作设施及设备的使用，会对信息安全产生怎样的影响;在不使公司有安全风险或不损害员工隐私的前提下，有哪些方式能安全地实现这样的设施及设备使用。 自备终端(Bring Your Own Device，简称BYOD)，即企业允许员工离职时保留自己的手机，这种做法正日益流行。如今智能手机功能也越来越多，我们不仅能用自己的手机访问电脑、网...[详细]
As time goes by, people are increasingly concerned about their own and their families' health. However, existing monitoring devices for individual vital signs have struggled to gain market share du...[详细]
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