M02061_17 Datasheet, PDF (38/45 Pages) M/A-COM Technology Solutions, Inc. – 3.3 or 5 Volt Laser Driver

M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
3.5
Fault Conditions when SCB is Low
This section describes the M02061 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.
Table 3-3. Circuit Response to Single-point Fault Conditions, when SCB is Low ^{1 2} (1 of 2)
Pin Name
V_CC
DIN+, DIN-
VCC3_SEL
DIS
FAIL
RESET
MOD_MON
BIAS_MON
TxPWR_MON
APC_SET
I_PIN
IBIAS_OUT
OUT_P
OUT_N
SV_CC
C_APC
V_CC3
PWA
SHDWN_OUT
MOD_SET
Circuit Response to Over-voltage Condition
or Short to V_CC
Circuit Response to Under-Voltage Condition
or Short to 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
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 state occurs.^{(1, 2)}
fault state occurs.^{(1, 2)}
Does not affect laser power.
Does not affect laser power.
Bias and modulation outputs are disabled.
3.3V operation - SV_CC is opened.
5V operation - SHDWN_OUT goes high.
Does not affect laser power.
Does not affect laser power (normal condition for circuit operation).
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⁾
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.
Does not affect laser power.
Laser bias current will be shut off, then a fault state occurs.⁽¹⁾
Does not affect laser power.
Laser bias current will be shut off and 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
Does not affect laser power. if this pin is used to control an external Does not affect laser power.
switch, laser current is disabled and fault state occurs.⁽¹⁾
The APC loop will attempt to compensate for the change in output A fault state occurs.⁽¹⁾
power. If the APC loop can not maintain the set average power, a
fault state occurs.^{(1, 2)}
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