M02061 Datasheet, PDF (32/37 Pages) M/A-COM Technology Solutions, Inc. – 3.3 or 5 Volt Laser Driver

Functional Description
Table 3-3. Circuit Response to Single-point Fault Conditions, when SCB is Low ^{1 2} (2 of 2)
Pin Name
Circuit Response to Over-voltage Condition
or Short to V_CC
Circuit Response to Under-Voltage Condition
or Short to Ground
DIS
Bias and modulation outputs are disabled.
3.3V operation - SV_CC is opened.
5V operation - SHDWN_OUT goes high.
FAIL
Does not affect laser power.
Does not affect laser power (normal condition for circuit
operation).
Does not affect laser power.
RESET
Does not affect laser power.
Does not affect laser power.
MOD_MON
BIAS_MON
TxPWR_MON
APC_SET
I_PIN
IBIAS_OUT
OUT_P
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⁾
Laser modulation is prevented; the APC loop will increase the
bias 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)}
A fault state occurs.⁽¹⁾
OUT_N
SV_CC
C_APC
V_CC3
Does not affect laser power.
Does not affect laser power.
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 the supply detection (high voltage) threshold
Bias and modulation outputs are disabled once V_CC3 drops
below the supply detection (low voltage) threshold
PWA
Does not affect laser power.
Does not affect laser power
SHDWN_OUT
MOD_SET
Does not affect laser power. if this pin is used to control an
external switch, laser current is disabled and fault state
occurs.⁽¹⁾
Does not affect laser power.
The APC loop will attempt to compensate for the change in A fault state occurs.⁽¹⁾
output power. If the APC loop can not maintain the set average
power, a fault state occurs.^{(1, 2)}
TC_SLOPE
Does not affect laser power.
May affect laser power. If this is the case, 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 fault state
occurs.^{(1, 2)}
SCB
Does not affect laser power.
Does not affect laser power.
DISDLY
Does not affect laser power.
Does not affect laser power.
NOTES:
1. A fault state will assert the FAIL output, disable bias and modulation outputs and will either open the switch at SV_CC (3.3V operation) or
SHDWN_OUT will go high (5V operation).
2. Does not affect laser power when the output is AC coupled to the laser.
02061-DSH-001-G
Mindspeed Technologies^®
32
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