MFC2000 datasheet(173/426 Pages) ETC

173 / 426 page

Hardware Description

MFC 2000 Multifunctional Peripheral Controller 2000

100723A

Conexant

7-25

Analog: AD 9220

8 ns

Data[11:0]

Data 1

CLK

Vin

hold

sample

min = 100 ns

min = 45 ns

pipeline delay (latency) = 3 clk cycles

Figure 7-12. Untitled Timing Diagram

Linear: LTC 1412

Vin

CONVST

Data[11:0]

min = 20 ns

conv = 240-283 ns

pipeline delay (latency) = 1 cycles

Figure 7-13. Untitled Timing Diagram

7.1.4

Firmware Operation

In order to obtain the optimal digital data, the dynamic range of analog signal must be maximized. In order to

maximize the dynamic range of scanner signal, the duration of the light exposure on the sensor must be just right.

If it is too short, then the signal will be too low; and if it is too long, then the signal will be saturated. The amount of

light exposure can be controlled by having programmable pulse width modulation on the LED control. Typically,

the signal from the sensor has a dc offset. This offset must be removed, and the resulting signal can be amplified

to restore the dynamic range.

Examples of how to setup the registers for various scanners are shown below. These setups are configured for

the fastest scanning operation. (only setup, not operation registers are shown)

Notes:

1.) The value for scan cycle depends on how msint signal is configured.

2.) The LED setting may need adjustment according to the proper light intensity for different

color.

MFC2000 Datasheet(PDF) 173 Page - List of Unclassifed Manufacturers