Kirdy

Low Noise Precision Laser Diode Driver with Built-in TEC Temperature Controller

Power Input

Parameter	Min	Typical	Max	Unit	Condition
Input Voltage		12		V
Input Current			2	A
PoE Standard		PoE+ (802.3at)

Note: TEC Output Current should be limited to ±2A when it is being powered via PoE(802.3af). Otherwise, Kirdy may malfunction.

Laser Diode Driver

Current Source Controller

Parameter	Min	Typical	Max	Unit	Condition
Resolution		0.292		uA
Control Range			307.2	mA
Current Limit		319.		mA
Compliance voltage		> 4.928		V
Current Noise (@ 1 kHz)		< 300		pA / rt(Hz)	@ DC Bias: 300 mA, Load: 10 Ω Load
RMS Noise(10 Hz - 1 MHz)		< 300		nA	@ DC Bias: 300 mA, Load: 10 Ω Load
Temperature Coefficient		±1		ppm/°C	@ DC Bias: 50 mA. Tested Temperature Range: 43-56 °C

Photodiode Input

Parameter	Min	Typical	Max	Unit	Condition
Photocurrent Range	0		3.0	mA
Photocurrent Resolution		0.8		uA
Bandwidth (-3 dB)		500		Hz

Note1: Circuit may be damaged if photodiode input current exceeds 3.0 mA. User can modify the circuit and reprogram the photodiode current monitor range via the given driver.

Note2: Photodiode operates in photovoaic mode.

Low Frequency Modulation Input

Parameter	Min	Typical	Max	Unit	Condition
Input Voltage	-1.0		1.0	V
Input Impedance		50 or 43.4k		ohm	Depends on Termination Switch Position
Bandwidth (-3 dB)		18		MHz	@Modulation Depth: 25 mA/V, Input : 1 Vp-p, DC Bias: 150 mA

Note: Low Frequency Modulation Input can accept DC input to impose a DC offset to the output current.

TEC Temperature Controller

TEC Current Output

Parameter	Min	Typical	Max	Unit	Condition
Resolution		22.9		uA
Control Range (Powered via 12 V Barrel Jack)	-3.0		3.0	A	With Active Cooling
Control Range (Powered via PoE(802.3af))	-2.0		2.0	A
Compliance Voltage		4.3		V
Voltage Reading Resolution		3.22		mV
Current Reading Resolution		2.0		mA

TEC Voltage and Current Limit

Parameter	Min	Typical	Max	Unit	Condition
Voltage Limit Settable Range	0		4.3	V
Voltage Limit Resolution		3.14		mV
Current Limit Settable Range	-3.0		3.0	A
Current Limit Resolution		1.57		mA

NTC Thermistor Sensor

Parameter	Min	Typical	Max	Unit	Condition
Resolution		0.01		mK	With 10 kohm NTC with 3950 B-Constant, 25°C T0
Sampling Rate		16.67	> 1k	Hz

Note: Actual Sampling Rate subjects to device operating conditions.

Digital PID Temperature Controller

Parameter	Min	Typical	Max	Unit	Condition
Temperature Stability		< 1		mk	Using supplied Kirdy Adapter with its copper plate installed. PID Parameters are obtained from Kirdy Autotune Algorithm.

Note: Actual Temperature Stability subjects to the ambient environment conditions.