ADM2582EBRWZ Analog Devices Inc, ADM2582EBRWZ Datasheet - Page 17

• Manufacturer Part Number: ADM2582EBRWZ
• Description: IC TXRX RS485 ISOLATED 20SOIC
• Manufacturer: Analog Devices Inc
• Series: isoPower®r

Specifications of ADM2582EBRWZ

• Inputs - Side 1/side 2: 1/1
• Number Of Channels: 3
• Isolation Rating: 2500Vrms
• Voltage - Supply: 3 V ~ 5.5 V
• Data Rate: 16Mbps
• Propagation Delay: 63ns
• Output Type: Differential
• Package / Case: 20-SOIC (7.5mm Width)
• Operating Temperature: -40°C ~ 85°C
• Device Type: Transceiver
• Ic Interface Type: RS485
• No. Of Drivers: 1
• Supply Voltage Range: 3V To 5.5V
• Driver Case Style: SOIC
• No. Of Pins: 20
• Operating Temperature Range: -40°C To +85°C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

In the case of unipolar ac or dc voltage, the stress on the insulation
is significantly lower. This allows operation at higher working
voltages while still achieving a 50-year service life. The working
voltages listed in Table 10 can be applied while maintaining the
50-year minimum lifetime, provided the voltage conforms to either
the unipolar ac or dc voltage cases. Any crossinsulation voltage
waveform that does not conform to Figure 37 or Figure 38 should
be treated as a bipolar ac waveform, and its peak voltage should
be limited to the 50-year lifetime voltage value listed in Table 10.
NOTES
1. THE VOLTAGE IS SHOWN AS SINUSODIAL FOR ILLUSTRATION
PURPOSES ONLY. IT IS MEANT TO REPRESENT ANY VOLTAGE
WAVEFORM VARYING BETWEEN 0 AND SOME LIMITING VALUE.
THE LIMITING VALUE CAN BE POSITIVE OR NEGATIVE, BUT THE
VOLTAGE CANNOT CROSS 0V.
RATED PEAK VOLTAGE
RATED PEAK VOLTAGE
RATED PEAK VOLTAGE
0V
0V
0V
Figure 38. Unipolar AC Waveform
Figure 36. Bipolar AC Waveform
500kbps
Figure 37. DC Waveform
GND
V
CC
1
RxD
TxD
DE
RE
DIGITAL ISOLATION iCoupler
Figure 39. ADM2587E Typical Maximum External Current Measurements
V
CC
V
CC
isoPower DC-TO-DC CONVERTER
OSCILLATOR
ENCODE
ENCODE
DECODE
GND
1
ISOLATION
BARRIER
Rev. B | Page 17 of 20
ADM2582E/ADM2587E
REGULATOR
DECODE
DECODE
ENCODE
RECTIFIER
ISOLATED POWER SUPPLY CONSIDERATIONS
The typical output voltage of the integrated isoPower dc-to-dc
isolated supply is 3.3 V. The isolated supply in the ADM2587E
is capable of supplying a current of 55 mA when the junction
temperature of the device is kept below 120°C. It is important
to note that the current available on the V
current available and includes the current required to supply the
internal RS-485 circuitry.
The ADM2587E can typically supply 15 mA externally on
V
while the junction temperature of the part is less than 120°C.
Table 15. Typical Maximum External Current Available
on V
External Load
Current (mA)
15
29
46
The ADM2582E typically has no current available externally
on V
When external current is drawn from the V
an increased risk of generating radiated emissions due to the
high frequency switching elements used in the isoPower dc to-
dc converter. Special care must be taken during PCB layout to
meet emissions standards. See Application Note AN-0971,
Control of Radiated Emissions with isoPower Devices, for details
on board layout considerations.
ISOOUT
ISOOUT
ISOOUT
V
ISOOUT
when the driver is switching at 500 kbps loaded with 54 Ω,
.
TRANSCEIVER
GND
D
R
2
R
54 Ω
120 Ω
Unloaded
T
V
Y
Z
A
B
ISOIN
ADM2582E/ADM2587E
EXTERNAL
LOAD
System Configuration
Double terminated bus with
R
Single terminated bus
Unterminated bus
GND
T
R
= 110 Ω
GND
T
2
ISOOUT
ISOOUT
pin is the total
pin, there is