C7942CA Datasheet, PDF (1/8 Pages) Hamamatsu Corporation – Flat panel sensor

IMAGE SENSOR
Flat panel sensor
C7942CA, C7943CA
Acquire digital X-ray image in real time and 170 & 176 mm diagonal size
Hamamatsu C7942CA and C7943CA Flat Panel Sensors are digital X-ray image sensors newly developed as key devices for non-destructive
inspection, biomedical imaging, X-ray microscopy and other real-time X-ray imaging applications requiring high resolution and high image quality.
C7942CA and C7943CA consist of a sensor board and a control board, both assembled in a thin, flat and compact package. The sensor board
contains a CsI scintillator plate, a two-dimensional photodiode array with FET switches and a signal processing IC chip. The photodiode array has
a 2400 × 2400 (C7942CA) or 1248 × 1248 (C7943CA) pixel format with minimized blooming and is highly sensitive to bluish green light emitted
from the CsI scintillator. Each row of pixels is addressed in sequence by the vertical shift register connected to the gate line.
Light emission occurs when X-rays are absorbed in the CsI scintillator. This light emission enters directly into the two-dimensional photodiode
array where an electric charge is stored in each pixel according to the light intensity. This charge is then transferred to the corresponding data line
by applying a control signal to the vertical shift register.
The sensor board also has 8 charge sensitive amplifier arrays each having 300 channel (C7942CA) or 156 channel (C7943CA) amplifiers with a
horizontal shift register. These amplifiers with a total of 2400 channels (C7942CA) or 1248 channels (C7943CA) are connected to a CDS
(Correlated Double Sampling) circuit that senses the charge on each video line and sends it as the analog video signal from each amplifier array.
The control board converts the analog video signal into a 12-bit digital signal and outputs it to an external frame grabber from a 12-bit parallel port.
C7943CA delivers a frame rate of 30 frames per second using 4 × 4 binning and is ideal for high frame rate applications. On the other hand,
C7942CA is ideal for applications requiring high resolution because of its 50 µm pixel size. Massive digital image data can easily be monitored on
a display unit by using a frame grabber board and video memory installed in the PC. C7942CA and C7943CA will prove ideal tools for real-time X-
ray imaging and processing where easy-to-use, high-resolution X-ray digital image sensors are needed.
Applications
l Non-destructive inspection
l Digital X-ray photography
s Block diagram (C7942CA)
PIXEL NUMBER
12
2401
2339 2400
4799 4800
SCINTILLATOR
(120 mm × 120 mm)
PHOTODIODE
ARRAY
Features
l C7942CA: 2400 × 2400 pixels
C7943CA: 1248 × 1248 pixels
l Digital output (12 bit)
l Dynamic picture image
C7942CA: 9 frame/s (4 × 4 binning)
C7943CA: 30 frame/s (4 × 4 binning)
l Low noise and wide dynamic range
l Compact package
l Easy use
EXTERNAL POWER SUPPLY
A. Vdd, D. Vdd V (±7.5)
(not attached)
IntExt
IntExt
BINNING
(bin0, bin1)
5759999 5760000
AMP ARRAY No. 1 AMP ARRAY No. 8
TIMING
PULSE
GENERATOR
BIAS
GENERATER
BUFFER
AMP
PROCESSING
AMP
BUFFER
AMP
PROCESSING
AMP
OSCILLATOR
ExtTrg
Vsync
Hsync
Pclk
A/D FIFO
A/D FIFO
VIDEO OUTPUT
(12 BIT DIGITAL)
KACCC0137EA
1