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4

LDXCHA SERIES LASER DIODE DRIVER

PIN DESCRIPTIONS

Table 1. Pin Descriptions

PIN

NAME

PIN DESCRIPTION

Connector J1 – Power & Laser Diode Connections

1

LDC

Connect this pin to the Laser Diode Cathode.

2

LDA

Connect this pin to the Laser Diode Anode. This pin is internally connected to V+.

3

V+

This pin is the main power supply pin for single and dual supply operation. Allowable voltage input is 5 to

30 V. It is internally connected to the laser diode anode (LDA).

If using a +5 V power supply, you can install jumper JP2 to power the control electronics from the same

supply. If using a higher voltage power supply for more compliance voltage to the laser diode, remove

JP2. 1

4

GND

Used for high current return. This pin is internally connected to pin J5:2.

Connector J2 – Status Connections & Modulation Input

1

MOD INPUT

Use this pin to allow for modulation. Range is -2 V to +5 V. This signal sums with the onboard trimpot.

If no modulation, install jumper JP1. 1 Modulation Input Impedance is 2.5 kΩ.

2

GND

This pin is the ground reference for modulation. Not to be used for high current return.

3

ENABLE

TTL compatible input that allows remote enabling and disabling of current to the laser diode.

To enable current, the voltage at this pin must be <0.3 V.

To disable current, the voltage at this pin must be >2 V.

The enable circuit uses an internal 10 kΩ pullup resistor.

For the LDxCHA to enable output current to the laser, the ENABLE pin must be configured properly. If

the ENABLE pin is not at a voltage <0.3 V, the LDxCHA will not enable current to the laser. The internal

pullup resistor will hold this pin high if it is left floating.

4

LIM MON

Monitors the current limit set by the user. Outputs a voltage proportional to the current limit.

See

Table 2 for model-specific transfer function. Range is 0 to 2.5 V on monitor.

5

LD STATUS

Monitors whether output current is enabled to the laser diode.

If output is enabled, there will be +5 V at this pin.

If output is disabled, there will be 0 V at this pin.

6

GND

This pin is the ground reference for ENABLE, LIM MON, and LD STATUS. Not to be used for high

current return.

Connector J3 – Monitor Connections

1

SET MON

Monitors the user-defined setpoint. Outputs a voltage proportional to the current setpoint.

See

Table 2 for model-specific transfer function. Range is 0 to 2.5 V on monitor.

2

I MON

Monitors the output current. Outputs a voltage proportional to the current through the laser diode.

See

Table 2 for model-specific transfer function. Range is 0 to 2.5 V on monitor.

3

P MON

Monitors the photodiode output. Outputs a voltage proportional to the current through the photodiode.

See

Table 2 for model-specific transfer function. Range is 0 to 2.5 V on monitor.

4

GND

This pin is the ground reference for the monitors on connector J3. Not to be used for high current return.

Connector J4 – Photodiode Connections

1

PDC

Connect this pin to the Photodiode Cathode.

The photodiode must be connected to the laser diode. See jumper JP3. 1

2

PDA

Connect this pin to the Photodiode Anode.

Connector J5 – Control Electronics Connections

1

+5V

Connect +5 VDC to this pin to power control electronics. Do not exceed 5.5 V at this pin.

If single +5 V supply operation is used, install JP2 and only connect the power supply to J1.

2

GND

This pin is the ground reference for +5V. Not to be used for high current return. This pin is internally

connected to pin J1:4.

1

For more details regarding jumpers, see

Table 3 on page 5 and “Install or Remove Jumpers” on page 12.