MAX1480A_05 Datasheet, PDF (14/21 Pages) Maxim Integrated Products – Complete, Isolated RS-485/RS-422 Data Interface

Complete, Isolated RS-485/RS-422
Data Interface
V_IN
5V
SHUTDOWN
DI
DE
RO
Si943304
R1
R2
V_{CC1 1}
V_{CC2 2}
28 ^{AC1 MAX1480A}
27 ^AC2
D1 3
26 ^{ISO V}CC1
D2 4
25 B
GND1 ₅
P
24 ^{ISO RO DRV}
FS _{6 MAX845}
MAX1487 23 A
SD ₇
V_{CC3 8}
22 ISO DI IN
21 ^{ISO DE IN}
DI ₉
V_{CC4 10}
DE ₁₁
R3
GND2 ₁₂
RO ₁₃
V_{CC5 14}
20 ISO COM1
19 ISO DI DRV
18 ISO VCC2
17 ISO DE DRV
16 ISO COM2
15 ISO RO LED
ISOLATION BARRIER
GND
Figure 3. MAX1480A Low-Power Shutdown Mode
Test Circuits
R
D
V_OD
R
V_OC
ISOLATION BARRIER
(DE´)
ISOLATION BARRIER
DI´
D
C_L1
R_DIFF
V_ID
C_L2
( ) ARE FOR
THE MAX1480A/B/C
R
RO (RO)*
* OPTOCOUPLER
OUTPUTS. SEE FIGURES 1
AND 2 FOR DETAILED BLOCK
DIAGRAM AND TYPICAL
APPLICATION CIRCUIT.
Figure 4. Driver DC Test Load
Figure 5. Driver/Receiver Timing Test Circuit
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