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STAR1000 数据表(PDF) 9 Page - Cypress Semiconductor

部件名 STAR1000
功能描述  1M Pixel Radiation Hard CMOS Image Sensor
Download  24 Pages
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制造商  CYPRESS [Cypress Semiconductor]
网页  http://www.cypress.com
标志 CYPRESS - Cypress Semiconductor

STAR1000 数据表(HTML) 9 Page - Cypress Semiconductor

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STAR1000
Document Number: 38-05714 Rev. *F
Page 9 of 24
Addressing Logic
The addressing logic allows direct addressing of rows and
columns. Instead of the one-hot shift registers that are often
used, address decoders are implemented. One can select a line
by presenting the required address to the address input of the
device and latching it to the Y- decoder logic. Presenting the
X- address to the device address input and latching it to the
X- address decoder can select a column.
A typical line read out sequence first selects a line by applying
the Y-address to the Y-decoder. Activation of the LD_Y input on
the Y-logic connects the pixel outputs of the selected line to the
column amplifiers. The individual column amplifier outputs are
connected to the output amplifier by applying the respective
X- addresses to the X- address decoder. Applying the appro-
priate Y- address to the Y- decoder and activating the “Reset”
input reset a line. The integration time of a row is the time
between the last reset of this row and the time when it is selected
for read out.
The Y- decoder logic has two different reset inputs: RESET and
RESET_DS. Activation of RESET resets the pixel to the Vdd
level; activation of RESET_DS resets the pixel to the voltage
level on the VREF input. This feature allows the application of
the so called dual slope integration. If dual slope integration is
not needed, VREF is tied to Vdd and RESET_DS must never be
activated.
Column Amplifiers
All outputs from the pixels in a column are connected in parallel
to a column amplifier. This amplifier samples the output voltage
and the reset level of the pixel whose row is selected at that
moment and presents these voltage levels to the output
amplifier. As a result, the pixels are always reset immediately
after read out as part of the sample procedure. Note that the
maximum integration time of a pixel is the time between two read
cycles.
Output Amplifier and Analog Multiplexer
The output amplifier combines subtraction of pixel signal level
from reset level with a programmable gain amplifier. Because the
amplifier is AC coupled, it also contains a provision to maintain
and restore the proper DC level.
An analog signal multiplexing feeds the pixel signal to the final
unity gain buffer, providing the required drive capability. Apart
from the pixel signal, three other external analog signals can be
fed to the output buffer. All these signals can be digitalised by the
on-chip ADC if the output of this buffer is externally connected to
the input of the ADC.
The purpose of the additional analog inputs (A_IN1, A_IN2, and
A_IN3) is to allow the possibility of processing other analog
signals through the image sensors signal path. These signals
can then be converted by the ADC and processed by the image
controller FPGA. The additional analog inputs are intended for
low frequency or DC signals and have a reduced bandwidth
compared with the image signal path.
ADC
The image sensor has a 10-bit ADC that is electrically separated
from the rest of the image sensor circuits and can be powered
down if an external ADC is used. The conversion takes place at
the falling edge of the clock and the output pins can be disabled
to allow operation of the device in a bus structure.
Timing and Control Signals
The pixels addressing is done by direct addressing of rows and
columns. This approach has the advantage of full flexibility when
accessing the pixel array: multiple windowing and subsampled
read out are possible by proper programming.
The following paragraphs clarify the timing for row and column
readout.
Row Selection and Reset Timing
Figure 5 on page 10 shows the timing of the line sequence
control signals. The timing constraints are presented in Table 6
on page 10
The address, presented at the address IO pins (A0…A9) is
latched in with the LD-Y pulse (active low). After latching, the
external controller already produces a new address.
[+] Feedback


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