ACS411CS datasheet(3/43 Pages) SEMTECH

3 / 43 page

ACS411CS PRE-RELEASE Issue 6.0 July 1999.

Mode 1 - Laser & PIN without integrated TIA

In mode 1, the device is configured for use with a

Laser and a PIN Diode without a TIA.

In this

configuration it is important to employ the TIA

available within the ACS9020. The ACS9020 TIA is

activated by setting PINRX = High.

In this configuration, the PIN Diode should be

connected to the PINP/PINN pins so that the TIA/

Post-Amp combination on the ACS9020 is used.

Mode 2 - Laser and & PIN Receiver with a TIA.

In mode 2, the device is configured for use with a

Laser and PIN Diode with an integrated TIA (Pin

Receiver). In this mode it is important to bypass the

TIA on the ACS9020 device.The VP/VN inputs are

activated by setting PINRX = Low.

In this mode, the outputs from the PIN Receiver

should be connected to the VP/VN inputs of the

ACS9020 Post-Amp via AC coupling capacitors as

shown in the diagram below.

Mode 3- LED & PIN without integrated TIA

In mode 3, the device is configured for use with a

LED and a PIN Diode without a TIA.

In this

configuration it is important to employ the TIA

available within the ACS9020. The ACS9020 TIA is

activated by setting PINRX = High.

Laser

PIN Diode

LAP

LAN

PINP

PINN

PMN

Mode 1: 3-pin Laser and PIN.

Fiber

LED

PIN Diode

LAP

LAN

PINP

PINN

Mode 3: LED and PIN.

Fiber

In this configuration, the PIN Diode should be

connected to the PINP/PINN pins so that the TIA/

Post-Amp combination on the ACS9020 is used.

Mode 4 - LED & PIN with a TIA.

In mode 4, the device is configured for use with an

LED and PIN Diode with an integrated TIA (Pin

Receiver). In this mode it is important to bypass the

TIA on the ACS9020 device.The VP/VN inputs are

activated by setting PINRX = Low.

In this mode, the outputs from the PIN Receiver

should be connected directly to the VP/VN inputs of

the ACS9020 Post-Amp via AC coupling capacitors

as shown in the diagram below.

Mode 5 - WDM Bidirectional Device

The device can be configured for use with a WDM

device (with and without a TIA) to realise a single

fiber link. The electrical connections are the same

as those for mode1 and mode2 dependent on

whether the WDM bidirectional device has a TIA

included or not.

If the device has a TIA integrated then the receivers

Positive/Negative differential outputs are connected

to VP/VN respectively via AC coupling capacitors

with PINRX set Low.

Laser

LAP

LAN

PMN

Fiber

Mode 2: 4-pin Laser and PIN with integrated TIA.

Fiber

LAP

PIN Diode

100PF

LED

LAP

LAN

Fiber

Mode 4: LED and PIN with internal TIA.

PIN Diode

100PF

Fiber

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