Optimized for High speed and Best SNR
DaVinci cameras are specialized to run CMOS imagers at their maximum speed with the best Signal to Noise Ratio (SNR). At the lowest light levels, SNR is limited by read noise and at the highest light levels, SNR is limited by photon noise.
By using large pixels with a high fill factor, DaVinci CMOS imagers are designed to have the highest possible Quantum Efficiency (QE) for the wavelengths of interest without using lenslets or backthinning. This yields an optimized photon-noise-limited SNR by maximizing the number of collected electrons from every available photon.
With very high responsivity output amplifiers, DaVinci imagers are also designed to have the lowest possible read noise to maximize SNR when read noise limited, resulting in the highest possible real dynamic range.
CMOS imagers – better than EMCCDs
EMCCDs offer low noise at low photon fluxes by using extremely high gain in their serial outputs, which leads to several problems. In high gain mode, EMCCDs suffer degradation in photon noise SNR due to the statistical processes used in the amplification process. This reduces the SNR by a minimum of the square root of 2. Thus, a backthinned EMCCD with 90% QE has an effective QE of 45% or lower if not perfectly adjusted.
These statistical processes also result in rogue multiplication events (spurious charge), leading to pixel spikes which when digitally eliminated in the camera can result in the elimination of real pixel spikes. The extremely high gain in the output depends on very high clock voltages in the camera. This leads to long-term damage to the sensor and the potential for gain instability.
Genetically Encoded Voltage Indicators (GEVIs)
Voltage Sensitive Dyes (VSDs)
DaVinci 2K CMOS CAMERA - download brochure
Spinning Disk Confocal
Swept Field Confocal
High Throughput Screening
Example Readout modes
• 200 Hz NDR/100 Hz CDS @ 2048x2048
• 400 Hz NDR/200 Hz CDS @ 2048x1024
• 1600 Hz NDR/800 Hz CDS @ 2048x256
• 2500 Hz NDR/1000 Hz CDS @ 2048x180 & more
On-Chip Binning - faster frames, deeper wells
Low Read Noise - 2.8 e- without correction
High QE - 65% without microlenses
No microlenses - no distortion, crosstalk
Monotonic - no A/D stitching
NDR Mode - 2X faster, optimal sampling
IDEAL FOR HIGH SPEED IMAGING
One 14-bit A/D per readout
DaVinci CMOS imagers achieve low readnoise by using high responsivity outputs and 14-bit external A/D converters. Since the A/D converters are external to the device, all the pixels in one segment of the imager are read through the same A/D yielding a highly uniform and monotonic response requiring minimal processing. sCMOS devices use separate 11-bit A/Ds with high and low gains for each column requiring intensive processing to approximate a linear and monotonic response.
Multiple output ports for fast frame rates
DaVinci CMOS imagers feature true on-chip binning. All DaVinci CMOS sensors are all split frame and feature multiple outputs on each half of the sensor. The 2k DaVinci CMOS imager has 16 outputs allowing a 100 Hz CDS/200 Hz NDR frame rate with a 68 MHz pixel rate.
True on-chip binning
DaVinci CMOS imagers feature true on-chip binning. Up to 2 complete half-columns can be binned into a single read. On-chip binning is used to increase the frame rate, but also increases the well-depth by combining the capacity of the pixels being binned. Thus, binning 2x2 increases the frame rate to 350 Hz, but also the well-depth by a factor of 4, increasing the maximum photon flux by a factor of 14.
Non-destructive read (NDR) mode
DaVinci CMOS imagers can be read non-destructively without resetting the pixels. Thus the pixels can be read repeatedly to reduce noise, or the frame rate can be doubled with any image frame serving as the reset frame for a subsequent image frame. This allows post-acquisition framing of fast events.