ADM2485_07 datasheet(3/20 Pages) AD

Nome de Peças	ADM2485

Descrição Electrónicos	High Speed, Isolated RS-485 Transceiver with Integrated Transformer Driver

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Fabricante Electrônico	AD [Analog Devices]

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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

kΩ

−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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