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PDF LTM2884 Data sheet ( Hoja de datos )
| Número de pieza | LTM2884 | |
| Descripción | Isolated USB Transceiver | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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1. LTM2884  Hay una vista previa y un enlace de descarga de LTM2884 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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Features
n Isolated USB Transceiver: 2500VRMS for 1 Minute
n USB 2.0 Full Speed and Low Speed Compatible
n Integrated Isolated DC/DC Converter, External or
Bus Powered
n Auto-Configuration of Bus Speed
n 2.5W (500mA at 5V) Output Power from External
Input Supply (VCC = 8.6V to 16.5V)
n 1W (200mA at 5V) Output Power from USB Bus
Supply (VBUS)
n 3.3V LDO Output Supply Signal References VLO, VLO2
n High Common Mode Transient Immunity: 30kV/μs
n ESD: ±15kV HBM on USB Interface Pins
n 15mm × 15mm × 5mm Surface Mount BGA Package
Applications
n Isolated USB Interfaces
n Host, Hub, or Device Isolation
n Industrial/Medical Data Acquisition
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.
LTM2884
Isolated USB Transceiver
with Isolated Power
Description
The LTM®2884 is a complete galvanically isolated USB
2.0 compatible μModule® (micromodule) transceiver.
An upstream supply powers both sides of the interface
through an integrated, isolated DC/DC converter.
The LTM2884 is ideal for isolation in host, hub, bus split-
ter or peripheral device applications. It is compatible with
USB 2.0 full speed (12Mbps) and low speed (1.5Mbps)
operation. Automatic speed selection configures integrated
pull-up resistors on the upstream port to match those
sensed on the downstream device.
The isolator µModule technology uses coupled inductors
and an isolated power transformer to provide 2500VRMS
of isolation between the upstream and downstream USB
interface. This device is ideal for systems requiring isolated
ground returns or large common mode voltage variations.
Uninterrupted communication is guaranteed for common
mode transients greater than 30kV/μs.
Enhanced ESD protection allows this part to withstand
up to ±15kV (human body model) on the USB transceiver
interface pins to local supplies and ±15kV through the
isolation barrier to supplies without latch-up or damage.
Typical Application
Powered 2.5W Isolated Hub Port
Bus Powered 1W Isolated Peripheral Device
4.4V TO 16.5V 8.6V TO 16.5V
VBUS
VLO
ON
VCC
LTM2884
PWR
SPNDPWR
500mA AT 5V
VCC2
+
VBUS2
100µF
VBUS
VBUS
VLO
ON
SPNDPWR
VCC
LTM2884
PWR
200mA AT 5V
VCC2
PERIPHERAL
HUB
µC
D1+
D1–
VLO2
DOWNSTREAM
D2+ USB PORT
UPSTREAM
D2– USB PORT
D1+
D1–
VLO2
D2+
D2–
1.5k
15k 15k
GND
GND2
2884 TA01a
GND
GND
GND2
2884 TA01b
For more information www.linear.com/LTM2884
2884f
1
1 page  
Electrical Characteristics
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 2: Guaranteed by design and not production tested.
Note 3: This µModule transceiver includes over temperature protection
that is intended to protect the device during momentary overload
conditions. Junction temperature will exceed 125°C when over
temperature protection is active. Continuous operation above specified
maximum operating junction temperature may result in device degradation
or failure.
LTM2884
Note 4: Maximum data rate is guaranteed by other measured parameters
and is not directly tested.
Note 5: Device considered a 2-terminal device. Measurement between
groups of pins A1 through B11 shorted together and pins K1 through L11
shorted together.
Note 6: The rated dielectric insulation voltage should not be interpreted as
a continuous voltage rating.
Note 7: In accordance with UL1577, each device is proof tested for the
2500VRMS rating by applying the equivalent positive and negative peak
voltage multiplied by an acceleration factor of 1.2 for one second.
For more information www.linear.com/LTM2884
2884f
5
5 Page 
Test Circuits
D1+ OR D2+
D1– OR D2–
LTM2884
D2+ OR D1+
CL
3.6V
D2– OR D1–
1.5k
CL
3.3V D1– OR D2–
0V D1+ OR D2+
3.3V D2– OR D1–
0V D2+ OR D1+
tLPRR
90%
10%
tLR
Figure 2. Low Speed Timing Measurements
tLPFF
90%
10%
tLF
2884 F02
D1+ OR D2+
D1– OR D2–
D2+ OR D1+
CL
D2– OR D1–
CL
3.3V D1+ OR D2+
0V D1– OR D2–
3.3V D2+ OR D1+
0V D2– OR D1–
tFPFF
90%
10%
tFF
Figure 3. Full Speed Timing Measurements
tFPRR
90%
10%
tFR
2884 F03
For more information www.linear.com/LTM2884
2884f
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11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTM2884.PDF ] | |
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