USB Image Scanner 100-Pin TQFP

The LM9833 is a complete USB image scanner system on a single IC. The LM9833 provides all the functions (image sensor control, illumination control, analog front end, pixel processing function image data buffer/DRAM controller, microstepping motor controller, and USB interface) necessary to create a high performance color scanner. The LM9833 scans images in 48 bit color or 16 bit gray, and has output data formats for 24, 36, and 48 bit color or 8, 12, and 16 bit gray. The LM9833 supports sensors with pixel counts of up to 16384 pixels × 3 colors (1200 dpi × 13.6 inches).The LM9833’s low operating and suspend mode supply currents allow design of USB bus-powered scanners. The only additional active components required are an external 4Mbit or 16Mbit DRAM for data buffering and power transistors for the stepper motor.

48 bit color and 16 bit gray output modes

16 bit ADC digitizes at up to 6Mpixels/s (2M RGB pixels/sec)

Digital Pixel Processing provides 1200, 800, 600, 400, 300, 200, 150, and 100dpi horizontal
resolution from a 1200dpi sensor and 600, 400, 300, 200, 150, 100, 75, and 50dpi horizontal
resolution from a 600dpi sensor

Provides 50-2400dpi vertical resolution in 1 dpi increments

Pixel rate error correction for gain (shading) and offset errors

Supports 4 or 16Mbit external DRAMs

Multiple CCD clocking rates allows matching of CCD clock to scan resolution and pixel
depth for maximum scan speed

Stepper motor control tightly coupled with image data buffer management to maximize
data transfer efficiency

PWM stepper motor current control allows microstepping for the price of fullstepping

USB interface for Plug and Play operation on USB-equipped computers

Serial EEPROM option for custom Vendor and Product IDs

Support for USB bus-powered operation

Pixel depths of 1, 2, or 4 bits are packed into bytes for faster scans of line art and
low pixel depth images

Supports 3 channel CCDs and 1 channel CIS sensors

3 (R, G, and B) 12-bit, user-programmable gamma correction tables

Compatible with a wide range of color linear CCDs and Contact Image Sensors (CIS)

Operates with 48MHz external crystal

Internal bandgap voltage reference

100 pin TQFP package

Analog to Digital Converter Resolution . . . 16 Bits

Maximum Pixel Conversion Rate . . . 6MHz

A4 Color 150dpi scan time . . . <10 seconds

A4 Color 300dpi scan time . . . <40 seconds

A4 Color 600dpi scan time . . . <160 seconds

Maximum Operating Current Consumption . . . 136mA

Maximum Suspend Current Consumption . . . 175µA