ADM2485
SPECIFICATIONS
2.7 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
DRIVER
Differential Outputs
Differential Output Voltage, V
OD
Min
Typ
Max
Unit
Test Conditions/Comments
2.1
2.1
2.1
Δ|V
OD
| for Complementary Output States
Common-Mode Output Voltage, V
OC
Δ|V
OC
| for Complementary Output States
Output Short-Circuit Current, V
OUT
= High
Output Short-Circuit Current, V
OUT
= Low
Bus Enable Output
Output High Voltage
60
60
V
DD2
− 0.1
V
DD2
− 0.3
V
DD2
− 0.4
5
5
5
5
0.2
3
0.2
200
200
V
V
V
V
V
V
V
mA
mA
V
V
V
V
V
V
V
V
μA
R = ∞, see Figure 21
R = 50 Ω (RS-422), see Figure 21
R = 27 Ω (RS-485), see Figure 21
V
TST
= –7 V to +12 V, V
DD1
≥ 4.75 V, see Figure 22
R = 27 Ω or 50 Ω, see Figure 21
R = 27 Ω or 50 Ω, see Figure 21
R = 27 Ω or 50 Ω, see Figure 21
−7 V ≤ V
OUT
≤ +12 V
−7 V ≤ V
OUT
≤ +12 V
I
ODE
= 20 μA
I
ODE
= 1.6 mA
I
ODE
= 4 mA
I
ODE
= −20 μA
I
ODE
= −1.6 mA
I
ODE
= −4 mA
TxD, RTS, RE
TxD, RTS, RE
TxD, RTS, RE = V
DD1
or 0 V
V
DD2
− 0.1
V
DD2
− 0.2
0.1
0.2
0.1
0.3
0.4
Output Low Voltage
Logic Inputs
Input High Voltage
Input Low Voltage
CMOS Logic Input Current (TxD, RTS, RE)
RECEIVER
Differential Inputs
Differential Input Threshold Voltage, V
TH
Input Hysteresis
Input Resistance (A, B)
Input Current (A, B)
RxD Logic Output
Output High Voltage
Output Low Voltage
0.7 V
DD1
−10
+0.01
0.25 V
DD1
+10
−200
20
70
30
+200
0.6
−0.35
V
DD1
− 0.1
V
DD1
− 0.4
mV
mV
kΩ
mA
mA
V
V
V
V
mA
μA
kHz
kHz
Ω
V
−7 V ≤ V
CM
≤ +12V
−7 V ≤ V
CM
≤ +12V
−7 V ≤ V
CM
≤ +12V
V
IN
= +12 V
V
IN
= −7 V
I
OUT
= +20 μA, V
A
− V
B
= +0.2 V
I
OUT
= +1.5 mA, V
A
− V
B
= +0.2 V
I
OUT
= −20 μA, V
A
− V
B
= −0.2 V
I
OUT
= −4 mA, V
A
− V
B
= −0.2 V
V
OUT
= GND or V
CC
0.4 V ≤ V
OUT
≤ 2.4 V
V
DD1
= 5.5 V
V
DD1
= 3.3 V
V
DD1
− 0.2
0.2
0.1
0.4
85
±1
600
430
1.5
2.5
Output Short-Circuit Current
Tristate Output Leakage Current
TRANSFORMER DRIVER
Oscillator Frequency
Switch-On Resistance
Start-Up Voltage
7
400
230
500
330
0.5
2.2
Rev. A | Page 3 of 20
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