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NOIV1SN1300A-XDC Datasheet(PDF) 8 Page - ON Semiconductor |
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NOIV1SN1300A-XDC Datasheet(HTML) 8 Page - ON Semiconductor |
8 / 76 page NOIV1SN1300A, NOIV2SN1300A http://onsemi.com 8 OVERVIEW Figure 4 and Figure 5 give an overview of the major functional blocks of the V1-SN/SE and V2-SN/SE sensor respectively. The system clock is received by the CMOS clock input. A PLL generates the intenal, high speed, clocks, which are distributed to the other blocks. Optionally, the V1-SN/SE can also accept a high speed LVDS clock, in which case the PLL will be disabled. The sequencer defines the sensor timing and controls the image core. The sequencer is started either autonomously (master mode) or on assertion of an external trigger (slave mode). The image core contains all pixels and readout circuits. The column structure selects pixels for readout and performs correlated double sampling (CDS) or double sampling (DS). The data comes out sequentially and is fed into the analog front end (AFE) block. The programmable gain amplifier (PGA) of the AFE adds the offset and gain. The output is a fully differential analog signal that goes to the ADC, where the analog signal is converted to a 10-bit data stream. Depending on the operating mode, eight or ten bits are fed into the data formatting block. This block adds synchronization information to the data stream based on the frame timing. For the V1-SN/SE version, the data then goes to the low voltage serial (LVDS) interface block which sends the data out through the I/O ring. The V2-SN/SE sensor does not have an LVDS interface but sends out the data through a 10-bit parallel interface. On-chip programmability is achieved through the Serial Peripheral Interface (SPI). See the Register Map on page 50 for register details. A bias block generates bias currents and voltages for all analog blocks on the chip. By controlling the bias current, the speed-versus-power of each block can be tuned. All biasing programmability is contained in the bias block. The sensor can automatically control exposure and gain by enabling the automatic exposure control block (AEC). This block regulates the integration time along with the analog and digital gains to reach the desired intensity. |
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