参数资料
型号: ADM2485BRWZ-REEL7
厂商: Analog Devices Inc
文件页数: 14/20页
文件大小: 0K
描述: IC TXRX ISOLATED RS-485 16SOIC
产品培训模块: iCoupler Digital Isolater Technology
设计资源: Half-Duplex, Isolated RS-485 Interface (CN0031)
标准包装: 1
系列: *
其它名称: ADM2485BRWZ-REEL7DKR
ADM2485
Rev. A | Page 3 of 20
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
Min
Typ
Max
Unit
Test Conditions/Comments
DRIVER
Differential Outputs
Differential Output Voltage, VOD
5
V
R = ∞, see Figure 21
2.1
5
V
R = 50 Ω (RS-422), see Figure 21
2.1
5
V
R = 27 Ω (RS-485), see Figure 21
2.1
5
V
VTST = –7 V to +12 V, VDD1 ≥ 4.75 V, see Figure 22
Δ|VOD| for Complementary Output States
0.2
V
R = 27 Ω or 50 Ω, see Figure 21
Common-Mode Output Voltage, VOC
3
V
R = 27 Ω or 50 Ω, see Figure 21
Δ|VOC| for Complementary Output States
0.2
V
R = 27 Ω or 50 Ω, see Figure 21
Output Short-Circuit Current, VOUT = High
60
200
mA
7 V ≤ VOUT ≤ +12 V
Output Short-Circuit Current, VOUT = Low
60
200
mA
7 V ≤ VOUT ≤ +12 V
Bus Enable Output
Output High Voltage
VDD2 0.1
V
IODE = 20 μA
VDD2 0.3
VDD2 0.1
V
IODE = 1.6 mA
VDD2 0.4
VDD2 0.2
V
IODE = 4 mA
Output Low Voltage
0.1
V
IODE = 20 μA
0.1
0.3
V
IODE = 1.6 mA
0.2
0.4
V
IODE = 4 mA
Logic Inputs
Input High Voltage
0.7 VDD1
V
TxD, RTS, RE
Input Low Voltage
0.25 VDD1
V
TxD, RTS, RE
CMOS Logic Input Current (TxD, RTS, RE)
10
+0.01
+10
μA
TxD, RTS, RE = VDD1 or 0 V
RECEIVER
Differential Inputs
Differential Input Threshold Voltage, VTH
200
+200
mV
7 V ≤ VCM ≤ +12V
Input Hysteresis
70
mV
7 V ≤ VCM ≤ +12V
Input Resistance (A, B)
20
30
7 V ≤ VCM ≤ +12V
Input Current (A, B)
0.6
mA
VIN = +12 V
0.35
mA
VIN = 7 V
RxD Logic Output
Output High Voltage
VDD1 0.1
V
IOUT = +20 μA, VA VB = +0.2 V
VDD1 0.4
VDD1 0.2
V
IOUT = +1.5 mA, VA VB = +0.2 V
Output Low Voltage
0.1
V
IOUT = 20 μA, VA VB = 0.2 V
0.2
0.4
V
IOUT = 4 mA, VA VB = 0.2 V
Output Short-Circuit Current
7
85
mA
VOUT = GND or VCC
Tristate Output Leakage Current
±1
μA
0.4 V ≤ VOUT ≤ 2.4 V
TRANSFORMER DRIVER
Oscillator Frequency
400
500
600
kHz
VDD1 = 5.5 V
230
330
430
kHz
VDD1 = 3.3 V
Switch-On Resistance
0.5
1.5
Ω
Start-Up Voltage
2.2
2.5
V
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