The Chroma 58606 PD/APD Burn-in system is a high density, multifunction, and temperature controlled module based system for photo diode burn-in and lifetime test. Each module has up to 256 Source Measurement Unit channels which can source current and measure voltage in various scenarios such as one described below. The system can accommodate 7 modules for a total of 1,792 device channels.
Auto Current Control Mode (ACC)
In Auto Current Control mode, the control circuit will provide the preset current to each photo diode with high stability. Even with fluctuations in device resistance and temperature, the current will be kept constant over the burn-in or test period. The device voltage will be measured by SMU and recorded as a quality reference parameter.
A proprietary designed heat plate will control the PD/APD device temperature with high accuracy, excellent stability, and good uniformity. This thermal condition approach is much more compact, easier to operate, offers better performance, and energy saving over chamber based systems. Customers gain the benefit of a small footprint, versatile usage, and easy maintenance.
High Precision Probing
The 58606 system offers accurate device probing for small pads down to 70um ensuring electrical contact with avalanche photo diodes and similar devices. The carrier and device interface board (DIB) pair are customized for each photo diode layout ensuring proper contact alignment for high precision probing.
Independent Module Operation
Customers can set each module independently (up to 28 modules in a full system) to a set test program varying from all other modules in the system. Variation includes all parameters including temperatures, Control Modes (ACC), start times and test durations. Modules can also accept carriers for a variation of CoS and packages to allow for multiple device types in one system. This provides the highest flexibility in operation.
Protection and Individual Channel Shutdown
The control circuit is specially designed for protecting each PD/APD. No in-rush current or voltage will occur to damage the devices. High/ Low limits of current and voltage can be set to perform shutdown protection. When abnormality happens, only the particular channel will be shut down while others are running normally. Ensuring device safety, ESD protection is also sustained in the system design.
Auto Data Recovery after Communication Interruption
The burn-in data is stored in the system PC and optionally in remote servers. If the communication between the module and PC is temporarily disconnected, the data will be buffered in the module 6 hours or more. After the communication is restored, the buffered data will be dumped to the PC/server without loss.