Pixel Readout Rate
The Pixel Readout Rate defines the rate at which pixels are read from the sensor. The faster the readout rate the higher the frame rate that can be achieved. The ability to change the pixel readout rate is important to achieve the maximum flexibility of camera operation.
Slower readout typically allows lower read noise but at the expense of slower frame rates. The following readout rates are available on the Zyla (Typical Read Noise for Rolling and Global Shutter modes below shows the typical read noise at each readout rate):
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Zyla 5.5: 200 MHz (100 MHz x 2 halves) and 560 MHz (280 MHz x 2 halves)
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Zyla 4.2: 216 MHz (108 MHz x 2 halves) and 540 MHz (270 MHz x 2 halves)
Typical Read Noise for Rolling and Global Shutter modes
| Model | Rate | Read noise (e-) Rolling Shutter (typical) | Read noise (e-) Global Shutter (typical) |
|---|---|---|---|
| Zyla 5.5 | 200 MHz | 1.2 | 2.6 |
| 560 MHz | 1.45 | 2.6 | |
| Zyla 4.2 | 216 MHz | 0.9 | N/A |
| 540 MHz | 1.1 | N/A |
Please refer to Understanding Read Noise in sCMOS for more information on read noise and the camera performance sheet for read noise values at the various readout speeds.