M02094-12 Datasheet, PDF (39/46 Pages) M/A-COM Technology Solutions, Inc. – EPON FTTH modules

M02094-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 2 Gbps
Rev V5
3.5
Fault Conditions
This section describes the M02094 operating modes during fault conditions. Over voltage, under voltage, pins
shorted to V_CC and pins shorted to ground are included in the fault Table 3-3.
Table 3-3. Circuit Response to Single-Point Fault Conditions
Pin Name
V_CC
DIN+, DIN-
VCC3_SEL
DIS
FAIL
RESET
MOD_MON
BIAS_MON
TxPWR_MON
APC_SET
I_PIN
IBOUT_CA(3)
IBOUT_CC(4)
OUT+⁽³⁾
OUT-⁽⁴⁾
SV_CC(3)
C_APC
V_CC3
PEAK_ADJ
CC_SEL
Circuit Response to Over-voltage Condition or Short to Circuit Response to Under-Voltage Condition or Short to
V_CC
Ground
Bias and modulation outputs are disabled once V_CC rises above the Bias and modulation outputs are disabled once V_CC drops below the
supply detection (high voltage) threshold (see Table 1-3)
supply detection (low voltage) threshold
The APC loop will attempt to compensate for the change in output The APC loop will attempt to compensate for the change in output
power. If the APC loop can not maintain the set average power, a power. If the APC loop can not maintain the set average power, a fault
fault state occurs.^(1,2,3)
state occurs.^(1,2,3)
Does not affect laser power.
Does not affect laser power.
Bias and modulation outputs are disabled.
Does not affect laser power (normal condition for circuit operation).
SV_CC is opened when CC_SEL is low or floating (or SGND is opened
when CC_SEL is high)
Does not affect laser power.
Does not affect laser power.
Does not affect laser power.
Does not affect laser power.
Does not affect laser power.
Does not affect laser power.
Does not affect laser power.
Does not affect laser power.
Does not affect laser power.
Does not affect laser power.
A fault state occurs.⁽¹⁾
A fault state occurs.⁽¹⁾
A fault state occurs.⁽¹⁾
A fault state occurs.⁽¹⁾
The laser will be turned off, then a fault state occurs.⁽¹⁾
A fault state occurs.⁽¹⁾
A fault state occurs.⁽¹⁾
The laser will be turned off, then a fault state occurs.⁽¹⁾
Laser modulation is prevented; the APC loop will increase the bias A fault state occurs.⁽¹⁾
current to compensate for the drop in laser power if it is DC
coupled. If the set output power can not be obtained, a fault state
occurs.^(1,2)
Does not affect laser power during common cathode operation Does not affect laser power during common cathode operation
because output is AC coupled.
because output is AC coupled.
Does not affect laser power.
Laser bias current will be shut off and a fault state occurs.⁽¹⁾
Laser bias current will be shut off, then a fault state occurs.⁽¹⁾
A fault state occurs.⁽¹⁾
Bias and modulation outputs are disabled once V_CC3 rises above Bias and modulation outputs are disabled once V_CC3 drops below the
the supply detection (high voltage) threshold
supply detection (low voltage) threshold
Does not affect laser power.
Does not affect laser power
Normal operation for common cathode configuration. If the M02094 Normal operation for common anode configuration. If the M02094 is
is configured for common anode drive, a fault state will occur.⁽¹⁾ configured for common cathode drive, a fault state will occur.⁽¹⁾
39
M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice.
Visit www.macom.com for additional data sheets and product information.
For further information and support please visit:
http://www.macom.com/support