ADM2485(RevPrk) Просмотр технического описания (PDF) - Analog Devices

Номер в каталоге

Компоненты Описание

Список матч

ADM2485
(Rev.:RevPrk)

High Speed Isolated RS-485 Transceiver with Integrated Transformer Driver

Analog Devices 

ADM2485

Preliminary Technical Data

SPECIFICATIONS

2.7 ≤ 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

Min

Typ

Max

Unit

5

V

2.1

5

V

2.1

5

V

2.1

5

V

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

60

60

VDD2−0.1

VDD2−0.3

VDD2−0.4

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

Three-State Output Leakage Current

Transformer Driver

Oscillator Frequency

Switch On resistance

Start-Up Voltage

0.7 VDD1

−10

−200

20

VDD1−0.1

VDD1−0.4

7

0.2

V

3

V

0.2

V

200

mA

200

mA

V

VDD2−0.1

V

VDD2−0.2

V

0.1

V

0.1

0.3

V

0.2

0.4

V

V

0.25 VDD1 V

0.01

10

µA

200

mV

70

mV

30

kΩ

0.6

mA

−0.35

mA

V

VDD1−0.2

V

0.1

V

0.2

0.4

V

85

mA

±1

µA

500

kHz

0.5

1.5

Ω

2.2

2.5

V

Test Conditions/Comments

R = ∞, Figure 3

R = 50 Ω (RS-422), Figure 3

R = 27 Ω (RS-485), Figure 3

VTST = −7 V to 12 V, VDD1 ≥ 4.75,

Figure 4

R = 27 Ω or 50 Ω, Figure 3

R = 27 Ω or 50 Ω, Figure 3

R = 27 Ω or 50 Ω, Figure 3

−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 = 4 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

Rev. PrK | Page 2 of 15

Share Link: