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WL-IPD4B: Digital Ultra Low Noise Boxcar Photodiode Integrator with USB

Datasheet Rev. 0.6a (08/2015) (1276 kB PDF)

LabView Demo Rev. 2 (06/2015) (493 kB ZIP)

Description

The WL-IPD4B is a highly-integrated boxcar integrator to be attached directly to up to 4 photo diodes. After a trigger pulse, all 4 inputs are integrated simultaneously for an adjustable amount of time between 6 us and 1 second (boxcar integrator). The measurement is digitized using integrated 20 bit analog-to-digital converters with ultra low noise and exceptional dynamic range. Integration results are transferred over the USB link to a computer (alternatively: 3.3 V UART, SPI, I2C).

In triggered mode, the IPD4B can continuously acquire 4 signal measurements and transfer them over the USB link at a trigger rate of up to 1.1 kHz. This allows shot-ot-shot measurements in systems with 1 kHz repetition rate. Internal triggering additionally allows gap-less boxcar integration mesurements with gate times 500 us to 1 s e.g. for monitoring.

The USB interface registers itself as virtual serial port (VCP) for direct and easy integration into lab control software such as LabView. Communication uses a simple text-based protocol.

Features:

Improvements over the IPD4A marked with (*).

• simultaneous integration of up to 4 inputs at up to 1.15 kHz
• each measurement includes signal and background acquisition
• gate time 6us to 1s with internal timer (*)
• high accuracy, low drift
• tunable full range 12pC to 350pC
• easy-to-use USB interface
• very high resolution due to 20 bit ADC
• extremely low noise integrator:
  for 350pC full scale range <10ppm noise and
  <20ppm noise down to 50pC full-scale range (typ.)
  shot noise limited for many applications
• external trigger rising or falling edge (TTL or LVDS) (*)
• tunable trigger delay up to 1 second (*)
  avoids use of delay generator
  can be set to "negative" delays for repetetive triggering
• internal trigger with adjustable rate up to 1 kHz (*)
• also allows continuous gap-free integration for gate times 500 us to 1 s on all 4 channels simultaneously
• small form factor: 60 x 40 x 22 mm (*)
• Comes with easy to use LabView drivers

Application Notes:

Application Note Rev. 1 (07/2014) (301 kB PDF)

Femtosecond fluorescence spectroscopy based on the optical Kerr effect
(applies predecessor IPD4A)
R. Mundt, G. Ryseck, P. Gilch, Femtosecond spectroscopy group, Chemistry, University of Düsseldorf, Germany (May 2014)