DC1747A-A Linear Technology, DC1747A-A Datasheet - Page 12

• Manufacturer Part Number: DC1747A-A
• Description: EVALUATION LOW EM1 KIT LTM2882-3
• Manufacturer: Linear Technology
• Series: µModuler

Specifications of DC1747A-A

• Main Purpose: Interface, Transceiver RS-232
• Embedded: No
• Utilized Ic / Part: LTM2882
• Primary Attributes: 3V Supply, Dual, Isolated, Transceiver + Power
• Kit Contents: Board, Datasheet
• Tool / Board Applications: Interface-Backplane, PCI, PCI Express, RS-XXX, Digital & Opto Isolator
• Mcu Supported Families: LTM2882
• Development Tool Type: Hardware - Eval/Demo Board
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Secondary Attributes: -

applicaTions inForMaTion
LTM2882
Channel Timing Uncertainty
Multiple channels are supported across the isolation bound-
ary by encoding and decoding of the inputs and outputs.
The technique used assigns T1IN/R1IN the highest priority
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.
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 less than 2µs, while each receiver remains continuously
active. This mode of operation is illustrated in Figure 6.
12
Figure 6. Half-Duplex Configuration Using D
3.3V (LTM2882-3)
5V (LTM2882-5)
R
X
T
X
ON
DIN
T1IN
R1OUT
T2IN
R2OUT
V
L
GND
V
CC
LTM2882
GND2
OUT
T1OUT
T2OUT
DOUT
V
R1IN
R2IN
2882 F06
CC2
to Drive DE
DE
Driver Overvoltage and Overcurrent Protection
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.
Each receiver input has a nominal input impedance of 5kΩ
relative to GND2. An open circuit condition will generate a
logic high on each receiver’s respective output pin.
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:
EN 61000-4-3
EN 61000-4-8
EN 61000-4-9
Tests were performed using an unshielded test card de-
signed per the data sheet PCB layout recommendations.
Specific limits per test are detailed in Table 1.
Table 1
EN 61000-4-3, Annex D
EN 61000-4-8, Level 4
EN 61000-4-8, Level 5
EN 61000-4-9, Level 5
*Non IEC Method
TEST
Radiated, Radio-Frequency,
Electromagnetic Field Immunity
Power Frequency
Magnetic Field Immunity
Pulsed Magnetic Field Immunity
1.4MHz to 2GHz
2GHz to 2.7GHz
80MHz to 1GHz
50Hz and 60Hz
FREQUENCY
Pulse
60Hz
FIELD STRENGTH
100A/m*
1000A/m
10V/m
30A/m
3V/m
1V/m
2882fb