Datasheet

Data Sheet ADM2481
Rev. A | Page 3 of 20
SPECIFICATIONS
3.0 V ≤ V
DD1
≤ 5.5 V, 4.75 V ≤ V
DD2
≤ 5.25 V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Table 1.
Parameter Symbol Min Typ Max Unit Test Conditions/Comments
DRIVER
Differential Outputs
Differential Output Voltage 5 V R
L
= ∞, see Figure 16
V
OD
2.0 5 V R
L
= 50 Ω (RS-422), see Figure 16
V
OD
1.5 5 V R
L
= 27 Ω (RS-485), see Figure 16
V
OD3
1.5 5 V V
TEST
= −7 V to +12 V, V
DD1
≥ 4.75,
see Figure 17
Δ |V
OD
| for Complementary Output States 0.2 V R
L
= 27 Ω or 50 Ω, see Figure 16
Common-Mode Output Voltage V
OC
3 V R
L
= 27 Ω or 50 Ω, see Figure 16
Δ |V
OC
| for Complementary Output States 0.2 V R
L
= 27 Ω or 50 Ω, see Figure 16
Output Short-Circuit Current, I
SC
V
OUT
= High −250 +250 mA −7 V ≤ V
OUT
≤ +12 V
V
OUT
= Low −250 +250 mA −7 V ≤ V
OUT
≤ +12 V
Logic Inputs
Input High Voltage V
IH
0.7 V
DD1
V
TxD, DE,
RE
Input Low Voltage V
IL
0.25 V
DD1
V
TxD, DE,
RE
CMOS Logic Input Current (TxD, DE,
RE
)
I
I
−10 +0.01 +10 μA
TxD, DE,
RE
= V
DD1
or 0 V
RECEIVER
Differential Inputs
Differential Input Threshold Voltage V
TH
−200 −125 −30 mV −7 V ≤ V
CM
≤ +12 V
Input Hysteresis V
HYS
20 mV −7 V ≤ V
CM
≤ +12 V
Input Resistance (A, B) 96 150 kΩ −7 V ≤ V
CM
≤ +12 V
Input Current (A, B) 0.125 mA V
IN
= 12 V
−0.1 mA V
IN
= −7 V
RxD Logic Output
Output High Voltage V
OH
V
DD1
− 0.1 V I
OUT
= 20 μA, V
A
− V
B
= 0.2 V
V
DD1
− 0.4 V
DD1
− 0.2 V I
OUT
= 4 mA, V
A
− V
B
= 0.2 V
Output Low Voltage V
OL
0.1 V I
OUT
= −20 μA, V
A
− V
B
= −0.2 V
0.4 V I
OUT
= −4 mA, V
A
− V
B
= −0.2 V
Output Short-Circuit Current I
SC
7 85 mA V
OUT
= GND or V
CC
Three-State Output Leakage Current ±1 μA 0.4 V ≤ V
OUT
≤ 2.4 V
POWER SUPPLY CURRENT
Logic Side I
DD1
2.5 mA 4.5 V ≤ V
DD1
≤ 5.5 V, outputs
unloaded,
RE
= 0 V
1.3 mA 3.0 V ≤ V
DD1
≤ 3.6 V, outputs
unloaded,
RE
= 0 V
Bus Side I
DD2
2.0 mA Outputs unloaded, DE = 5 V
1.7 mA Outputs unloaded, DE = 0 V
COMMON-MODE TRANSIENT IMMUNITY
1
V
CM
25 kV/μs TxD = V
DD1
or 0 V, V
CM
= 1 kV,
transient magnitude = 800 V
1
Common-mode transient immunity is the maximum common-mode voltage slew rate that can be sustained while maintaining specification-compliant operation.
V
CM
is the common-mode potential difference between the logic and bus sides. The transient magnitude is the range over which the common mode is slewed. The
common-mode voltage slew rates apply to both rising and falling common-mode voltage edges.