ACT4438 datasheet(5/7 Pages) AEROFLEX

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Aeroflex Circuit Technology

SCD4438-1 REV A 11/19/01 Plainview NY (516) 694-6700

Figure 3 – Transmitter (TX) Output Waveform

Figure 4 – Transmitter (TX) Output Offset

Figure 5 – Typical Transformer Connection

6V P-P MIN

7.7V P-P MAX

90%

10%

tr*

tf*

* Rise and fall times measured at point A-A’ in Fig 5

0 Volts

OUTPUT OFFSET

LAST BIT

2.5 µsec

*Offset measured at point A-A’ in Fig 5

A’

Ω

0 volts

Magnified View

Figure 6 – Power Dissipation vs. Duty Cycle

Note: Vcc = 5 Volts, Vbus (pt A-A') at 7.5 Volts P-P

90 100

1600

1400

1200

1000

800

600

400

200

DUTY CYCLE – PERCENT

Typical

Maximum

Use Pulse/Technitrol

Part# 1553-45 or equivalent

TX DATA OUT

RX DATA IN

ACT4438-1

Transformer Model:

23-26

18-21

GND

RISET

2.7K

Ω

+5V

6.8µF

0.1µF

9,35,39,50

Direct Stub

1:2.5

10,11,33,34

1800

2000

2200

Configurations and Ordering Information

Model No.

Screening Level

Receiver and Transmitter

Data Levels (See Figure 1)

Case

ACT4438-1

Industrial Temperature

-55°C to +90°C

Normally Low

56 Bump Chip

Carrier

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