WM8214 Datasheet, PDF (24/36 Pages) Wolfson Microelectronics plc – 40MSPS 16 BIT CCD DIGITISER

WM8214
NORMAL OPERATING MODES
Production Data
Table 4 below shows the normal operating modes of the device. The MCLK speed can be specified
along with the MCLK:VSMP ratio to achieve the desired sample rate.
NUMBER
OF
CHANNELS
3
DESCRIPTION
Three channel
Pixel-by-Pixel
CDS
MAXIMUM
AVAILABLE SAMPLE RATE
YES
13.33 MSPS
2
Two channel
Pixel-by-Pixel
YES
20 MSPS
1
One channel
Pixel-by-Pixel
YES
40 MSPS
Table 4 WM8214 Normal Operating Modes
TIMING
REQUIREMENTS
MCLK max = 40Mhz
Minimum MCLK:VSMP
ratio = 3:1
MCLK max = 40Mhz
Minimum MCLK:VSMP
ratio = 2:1
MCLK max = 40Mhz
Minimum MCLK:VSMP
ratio = 1:1
CHANNEL
MODE
SETTINGS
MONO = 0
TWOCHAN = 0
MONO = 0
TWOCHAN = 1
MONO = 1
TWOCHAN = 0
Table 5 below shows the different channel mode register settings required to operate the 8214 in 1, 2
and 3 channel modes.
MONO
0
0
1
TWOCHAN
0
1
0
CHAN[1:0]
XX
XX
00
1
0
01
1
0
10
1
0
11
1
1
XX
Table 5 Sampling Mode Summary
MODE DESCRIPTION
3-channel (colour mode)
2-channel (Blue PGA disabled)
1-channel (monochrome) mode.
Red channel selected, Green and Blue PGAs disabled.
1-channel (monochrome) mode.
Green channel selected, Red and Blue PGAs disabled.
1-channel (monochrome) mode.
Blue channel selected, Red and Green PGAs disabled.
Invalid mode
Invalid mode
Note: Unused input pins should be connected to AGND.
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PD, Rev 4.4, August 2008
24