The XRD9826 is a complete linear CIS or CCD sensor signal processor on a single chip. It includes a high-speed 16-bit resolution ADC, a 6-bit programmable gain amplifier with gain adjustable from 1 to 10 and an 8-bit programmable input reference bias calibration range of 800mV.
Pin arrangement
In a CCD configuration, the input signal is AC, plus an external capacitor. Internal tongs set black level. In the CIS configuration, the clamp switch can be disabled and the CIS output signal is coupled from the CIS sensor to XRD9826. CIS signal level is transferred to VRB in order to use the full range of ADC. In a CIS configuration, the input can also be AC coupled similar to a CCD configuration.
This causes CIS signals with large black levels to be internally clamped to a DC reference equal to the black level. The DC reference is subtracted from inside the input signal. CIS configuration can also be used for other applications that do not require CDS capabilities, such as low-cost data acquisition
Functional Block Diagram
Features
● 16-Bit Resolution
● One-channel 6MSPS Pixel Rate
● Triple-channel 2MSPS Pixel Rate
● 6-Bit Programmable Gain Amplifier
● 8-Bit Programmable Offset Adjustment
● CIS or CCD Compatibility
● Internal Clamp for CIS or CCD AC Coupled Configurations
● 3.3V or 5V Operation & I/O Compatibility
● Serial Load Control Registers
● Low Power CMOS: 200mW-typ
● Low Cost 20-Lead Packages
● USB Compliant
Applications
● Color and grayscale flatbed scanners
● Color and grayscale sheet scanners
● Multifunctional peripherals
● Digital color copier
● Universal CIS or CCD imaging
● Low cost data acquisition
● Simple and direct interface Canon 600 DPI sensor
