ADN2870ACPZ Analog Devices Inc, ADN2870ACPZ Datasheet - Page 17

IC,Laser Diode/LED Driver,LLCC,24PIN,PLASTIC

ADN2870ACPZ

Manufacturer Part Number
ADN2870ACPZ
Description
IC,Laser Diode/LED Driver,LLCC,24PIN,PLASTIC
Manufacturer
Analog Devices Inc
Type
Laser Diode Driver (Fiber Optic)r
Datasheet

Specifications of ADN2870ACPZ

Data Rate
3.3Gbps
Number Of Channels
1
Voltage - Supply
3 V ~ 3.6 V
Current - Supply
30mA
Current - Modulation
90mA
Current - Bias
100mA
Operating Temperature
-40°C ~ 85°C
Package / Case
24-VFQFN, CSP Exposed Pad
Mounting Type
Surface Mount
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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ALARMS
The ADN2870 has a latched active high monitoring alarm
(FAIL). The FAIL alarm output is an open drain in conformance
to SFP MSA specification requirements.
The ADN2870 has a three-fold alarm system that recognizes:
Table 5. ADN2870 Single-Point Alarms
Alarm Type
1. Bias Current
2. MPD Current
3. Crucial Nodes
Table 6. ADN2870 Response to Various Single-Point Faults in AC-Coupled Configuration, as Shown in Figure 32
Mnemonic
CCBIAS
PAVSET
PAVREF
RPAV
ERCAP
PAVCAP
DATAP
DATAN
ALS
ERSET
IMMON
ERREF
IBMON
FAIL
IMODP
IMODN
IBIAS
Use of a bias current higher than expected, most likely as
a result of laser aging.
Out-of-bounds average voltage at the MPD input, indicat-
ing an excessive amount of laser power or a broken loop.
Undervoltage in IBIAS pin (laser diode cathode) that
increases laser power.
Short to VCC
Fault state occurs
Fault state occurs
Voltage mode: Fault state occurs
Resistor mode: Tied to VCC
Voltage mode: Fault state occurs
Resistor mode: Tied to VCC
Does not increase laser average power
Fault state occurs
Does not increase laser average power
Does not increase laser average power
Output currents shut off
Does not increase laser average power
Does not affect laser power
Voltage mode: Fault state occurs
Resistor mode: Tied to VCC
Fault state occurs
Fault state occurs
Does not increase laser average power
Does not increase laser average power
Fault state occurs
Mnemonic
IBMON
PAVSET
ERREF (the ERRREF designed tied
to VCC in resistor setting mode.)
IBIAS
Short to GND
Fault state occurs
Fault state occurs
Fault state occurs
Fault state occurs
Does not increase laser average power
Fault state occurs
Does not increase laser average power
Does not increase laser average power
Normal currents
Does not increase laser average power
Does not increase laser average power
Voltage mode: Does not increase
average power
Resistor mode: Fault state occurs
Does not increase laser average power
Does not increase laser average power
Does not increase laser average power
Does not increase laser average power
Fault state occurs
Over Voltage or Short to VCC
Condition
Alarm if > 1.2 V
Alarm if > 1.7 V
Alarm if shorted to VCC (the alarm is
valid for voltage setting mode only)
Ignore
Rev. A | Page 17 of 20
The bias current alarm trip point is set by selecting the value of
resistor on the IBMON pin to GND. The alarm is triggered
when the voltage on the IBMON pin goes above 1.2 V.
FAIL is activated when the single-point faults in Table 5 occur.
Under Voltage or Short to GND
Condition
Ignore
Alarm, if <0.9 V
Alarm, if shorted to GND
Alarm, if <600 mV
Open
Does not increase laser average power
Fault state occurs
Fault state occurs
Voltage mode: Fault state occurs
Resistor mode: Does not increase
average power
Does not increase laser average power
Fault state occurs
Does not increase laser average power
Does not increase laser average power
Output currents shut off
Does not increase laser average power
Does not increase laser average power
Does not increase laser average power
Does not increase laser average power
Does not increase laser average power
Does not increase laser average power
Does not increase laser power
Fault state occurs
ADN2870

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