ADM2485 Ver la hoja de datos (PDF) - Analog Devices
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ADM2485 Datasheet PDF : 20 Pages
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ADM2485
SPECIFICATIONS
2.7 V ≤ VDD1 ≤ 5.5 V, 4.75 V ≤ VDD2 ≤ 5.25 V, TA = TMIN to TMAX, unless otherwise noted.
Table 1.
Parameter
DRIVER
Differential Outputs
Differential Output Voltage, VOD
Δ|VOD| for Complementary Output States
Common-Mode Output Voltage, VOC
Δ|VOC| for Complementary Output States
Output Short-Circuit Current, VOUT = High
Output Short-Circuit Current, VOUT = Low
Bus Enable Output
Output High Voltage
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, VTH
Input Hysteresis
Input Resistance (A, B)
Input Current (A, B)
RxD Logic Output
Output High Voltage
Output Low Voltage
Output Short-Circuit Current
Tristate Output Leakage Current
TRANSFORMER DRIVER
Oscillator Frequency
Switch-On Resistance
Start-Up Voltage
Min
Typ
Max
Unit
5
V
2.1
5
V
2.1
5
V
2.1
5
V
0.2
V
3
V
0.2
V
60
200
mA
60
200
mA
VDD2 − 0.1
V
VDD2 − 0.3 VDD2 − 0.1
V
VDD2 − 0.4 VDD2 − 0.2
V
0.1
V
0.1
0.3
V
0.2
0.4
V
0.7 VDD1
−10
+0.01
V
0.25 VDD1 V
+10
μA
−200
70
20
30
+200 mV
mV
kΩ
0.6
mA
−0.35 mA
VDD1 − 0.1
V
VDD1 − 0.4 VDD1 − 0.2
V
0.1
V
0.2
0.4
V
7
85
mA
±1
μA
400
500
600
kHz
230
330
430
kHz
0.5
1.5
Ω
2.2
2.5
V
Test Conditions/Comments
R = ∞, see Figure 21
R = 50 Ω (RS-422), see Figure 21
R = 27 Ω (RS-485), see Figure 21
VTST = –7 V to +12 V, VDD1 ≥ 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 ≤ VOUT ≤ +12 V
−7 V ≤ VOUT ≤ +12 V
IODE = 20 μA
IODE = 1.6 mA
IODE = 4 mA
IODE = −20 μA
IODE = −1.6 mA
IODE = −4 mA
TxD, RTS, RE
TxD, RTS, RE
TxD, RTS, RE = VDD1 or 0 V
−7 V ≤ VCM ≤ +12V
−7 V ≤ VCM ≤ +12V
−7 V ≤ VCM ≤ +12V
VIN = +12 V
VIN = −7 V
IOUT = +20 μA, VA − VB = +0.2 V
IOUT = +1.5 mA, VA − VB = +0.2 V
IOUT = −20 μA, VA − VB = −0.2 V
IOUT = −4 mA, VA − VB = −0.2 V
VOUT = GND or VCC
0.4 V ≤ VOUT ≤ 2.4 V
VDD1 = 5.5 V
VDD1 = 3.3 V
Rev. A | Page 3 of 20
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