Moteur de recherche de fiches techniques de composants électroniques
  French  ▼
ALLDATASHEET.FR

X  

ADN2891 Fiches technique(PDF) 10 Page - Analog Devices

No de pièce ADN2891
Description  3.3 V, 3.2 Gbps, Limiting Amplifier
Download  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

ADN2891 Fiches technique(HTML) 10 Page - Analog Devices

Back Button ADN2891 Datasheet HTML 6Page - Analog Devices ADN2891 Datasheet HTML 7Page - Analog Devices ADN2891 Datasheet HTML 8Page - Analog Devices ADN2891 Datasheet HTML 9Page - Analog Devices ADN2891 Datasheet HTML 10Page - Analog Devices ADN2891 Datasheet HTML 11Page - Analog Devices ADN2891 Datasheet HTML 12Page - Analog Devices ADN2891 Datasheet HTML 13Page - Analog Devices ADN2891 Datasheet HTML 14Page - Analog Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 10 / 16 page
background image
ADN2891
Rev. A | Page 10 of 16
THEORY OF OPERATION
LIMITING AMPLIFIER
Input Buffer
The ADN2891 limiting amplifier provides differential inputs
(PIN/NIN), each having single-ended, on-chip, 50 Ω termina-
tion. The amplifier can accept either dc-coupled or ac-coupled
signals; however, an ac-coupled signal is recommended. Using a
dc-coupled signal, the amplifier needs a correct input common-
mode voltage and enough headroom to handle the dynamic
input signal strength. Additionally, TIA output offset drifts may
degrade receiver performance.
The ADN2891 limiting amplifier is a high gain device. It is
susceptible to dc offsets in the signal path. The pulse width
distortion presented in the NRZ data or a distortion generated
by the TIA may appear as dc offset or a corrupted signal to the
ADN2891 inputs. An internal offset correction loop can
compensate for certain levels of offset. To compensate for more
offset, an external capacitor connected between the CAZ1 and
CAZ2 pins maybe necessary. For GbE and FC applications, no
external capacitor is necessary; however, for SONET appli-
cations, a 0.01 μF capacitor helps the input signal offset
compensation and provides a 3 dB cutoff frequency at 1 kHz.
CML Output Buffer
The ADN2891 provides differential CML outputs, OUTP and
OUTN. Each output has an internal 50 Ω termination to VCC.
LOSS OF SIGNAL (LOS) DETECTOR
The on-chip LOS circuit drives LOS to logic high when the
input signal level falls below a user-programmable threshold.
The threshold level can be set to anywhere from 3.5 mV p-p to
35 mV p-p, typical, and is set by a resistor connected between
the THRADJ pin and VEE. See Figure 8 and Figure 9 for the
LOS threshold vs. THRADJ. The ADN2891 LOS circuit has an
electrical hysteresis greater than 2.5 dB to prevent chatter at the
LOS signal. The LOS output is an open-collector output that
must be pulled up externally with a 4.7 kΩ to 10 kΩ resistor.
RECEIVED SIGNAL STRENGTH INDICATOR (RSSI)
The ADN2891 has an on-chip, RSSI circuit. By monitoring the
current supplied to the photodiode, the RSSI circuit provides an
accurate, average power measurement. The output of the RSSI is
a current that is directly proportional to the average amount of
PIN photodiode current. Placing a resistor between the
RSSI_OUT pin and GND converts the current to a GND
referenced voltage. This function eliminates the need for
external RSSI circuitry for SFF-8472-compliant optical
receivers. For more information, see Figure 14 to Figure 18.
SQUELCH MODE
Driving the SQUELCH input to logic high disables the limiting
amplifier outputs. Using LOS output to drive the SQUELCH
input, the limiting amplifier outputs stop toggling anytime a
signal input level to the limiting amplifier drops below the
programmed LOS threshold.
The SQUELCH pin has a 100 kΩ, internal, pull-down resistor.


Numéro de pièce similaire - ADN2891

FabricantNo de pièceFiches techniqueDescription
logo
Analog Devices
ADN2891 AD-ADN2891 Datasheet
596Kb / 16P
   Limiting Amplifier
ADN2891ACP AD-ADN2891ACP Datasheet
611Kb / 16P
   3.3 V, 3.2 Gbps, Limiting Amplifier
REV. A
ADN2891ACPZ-500RL7 AD-ADN2891ACPZ-500RL7 Datasheet
611Kb / 16P
   3.3 V, 3.2 Gbps, Limiting Amplifier
REV. A
ADN2891ACPZ-500RL7 AD-ADN2891ACPZ-500RL7 Datasheet
596Kb / 16P
   Limiting Amplifier
ADN2891ACPZ-RL AD-ADN2891ACPZ-RL Datasheet
611Kb / 16P
   3.3 V, 3.2 Gbps, Limiting Amplifier
REV. A
More results

Description similaire - ADN2891

FabricantNo de pièceFiches techniqueDescription
logo
Analog Devices
ADN2891ACP AD-ADN2891ACP Datasheet
611Kb / 16P
   3.3 V, 3.2 Gbps, Limiting Amplifier
REV. A
ADN2891 AD-ADN2891_15 Datasheet
611Kb / 16P
   3.3 V, 3.2 Gbps, Limiting Amplifier
REV. A
ADN2892 AD-ADN2892_15 Datasheet
440Kb / 16P
   3.3 V, 4.25 Gbps, Limiting Amplifier
REV. B
ADN2892ACPZ-500RL7 AD-ADN2892ACPZ-500RL7 Datasheet
451Kb / 16P
   3.3 V, 4.25 Gbps, Limiting Amplifier
REV. A
ADN2892 AD-ADN2892_17 Datasheet
454Kb / 16P
   3.3 V, 4.25 Gbps, Limiting Amplifier
ADN2880 AD-ADN2880 Datasheet
355Kb / 12P
   3.2 Gbps, 3.3 V, Low Noise, Transimpedance Amplifier
REV. 0
ADN2880 AD-ADN2880_15 Datasheet
356Kb / 12P
   3.2 Gbps, 3.3 V, Low Noise, Transimpedance Amplifier
REV. 0
logo
Texas Instruments
ONET3301PARGTT TI-ONET3301PARGTT Datasheet
914Kb / 18P
[Old version datasheet]   155-Mbps To 3.3-Gbps LIMITING AMPLIFIER
ONET3301PARGTTG4 TI-ONET3301PARGTTG4 Datasheet
914Kb / 18P
[Old version datasheet]   155-Mbps To 3.3-Gbps LIMITING AMPLIFIER
ONET3301PA TI-ONET3301PA Datasheet
253Kb / 12P
[Old version datasheet]   155-MBPS TO 3.3-GBPS LIMITING AMPLIFIER
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16


Fiches technique Télécharger

Go To PDF Page


Lien URL




Politique de confidentialité
ALLDATASHEET.FR
ALLDATASHEET vous a-t-il été utile ?  [ DONATE ] 

À propos de Alldatasheet   |   Publicité   |   Contactez-nous   |   Politique de confidentialité   |   Echange de liens   |   Fabricants
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com