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			3.5	A
PoE Standard		PoE+ (802.11at)

Note: TEC Output Current should be limited to ±2A when it is being powered via PoE+. 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		> 5		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)	-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.