ACS411CS Semtech Corporation, ACS411CS Datasheet - Page 3

• Manufacturer Part Number: ACS411CS
• Description: Acapella Optical Modem ic
• Manufacturer: Semtech Corporation

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.
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.
configuration it is important to employ the TIA
available within the ACS9020. The ACS9020 TIA is
activated by setting PINRX = High.
Mode 2: 4-pin Laser and PIN with integrated TIA.
VP
VN
LAP
LAP
PMN
LAP
PMN
LAN
LAN
PINP
PINN
100PF
100PF
Mode 1: 3-pin Laser and PIN.
+
-
PIN Diode
PIN Diode
Laser
Laser
Fiber
Fiber
Fiber
Fiber
In this
In this
3
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.
Mode 4: LED and PIN with internal TIA.
VP
VN
LAP
LAN
PINP
PINN
LAP
LAN
100PF
100PF
Mode 3: LED and PIN.
+
-
PIN Diode
PIN Diode
LED
LED
ACS411CS PRE-RELEASE Issue 6.0 July 1999.
Fiber
Fiber
Fiber
Fiber