TxD1

RxD1

TxD2

RxD2

TxD3

RxD3

TxD4

RxD4

RxD1

TxD1

RxD2

TxD2

RxD3

TxD3

TxD4

RxD4

XO1

XI1

XI2

XO2

XI2

XO2

XI1

XO1

ACS401

ACS401

*Synchronous

Channels

*Asynchronous

Channel

Single Fiber Link

Figure 4. 6 Full-duplex channels over a single fiber

Single Fiber LED link

Link Budget Example (Rtrc set so LED launch current = 100 mApeak)

Fibertype

Plastic

Glass

Glass

Fibersize

1000 micron

62.5 micron 50 micron

Minimum transmit couple power to fiber (µW)

1000

100

50

Minimum LED responsivity (AW)

0.01

0.1

0.12

Minimum ACS401 sensitivity (nA)

500

500

500

Minimum input power to ACS401 amplifier (µW)

50

5

4.1

Link budget (dB)

13

13

11

Single Fiber Duplex LASER link

Link Budget Example (LASER launch power = 1 mW)

Fibertype

Glass (single mode)

Fibersize

9 micron

Minimum transmit couple power to fiber (µW)

1000

Minimum PIN responsivity (AW)

0.35

Minimum ACS401 sensitivity (nA)

500

Minimum input power to ACS401 amplifier (µW)

1.43

Link budget (dB) (single mode fiber attenuation = 0.3 dB km)

28.4

GND

VA+

VG+

nF

k

Ω

Pin 48 and Pin 51

should be connected

together

CON1

CON2

VD+ pins 19, 20, 29 and 67.

ACS401

µF

nF

nF

µH

µH

AGND

ACS401 GND

VD+

SETB

All capacitors should be placed

very close to the ACS401.

Figure 3. Recommended power supply layout

GND

+5V

V+

TRC

Rtrc > 800

Ω

nF

ACS401 GND

CNT

ACS401 GND

GND

22-

GND pins 3, 10, 16, 17, 36, 41 and 43

.

%

%

%

%

Digital Outputs rise and fall times

t

r

t

f

TxCL and RxCL clock pulse widths

t

wl

t

wh

t

sut

t

ht

t

sur

t

hr

TxD

RxD

Transmit set-up and hold times

Receive set-up and hold times

TxCL

RxCL

Figure 2. Timing diagrams

4 * Synchronous

Channels

4 * Asynchronous

Channels

47 µH

47 µH

47 µH

1

10

100

100

100

90 %

90 %

10 %

10 %