WM8198 Просмотр технического описания (PDF) - Wolfson Microelectronics plc
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WM8198 Datasheet PDF : 31 Pages
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WM8198
Production Data
OPERATING MODES
Table 4 summarises the most commonly used modes, the clock waveforms required and the register
contents required for CDS and non-CDS operation.
MODE
DESCRIPTION
CDS
AVAILABLE
MAX
SAMPLE
RATE
SENSOR
INTERFACE
DESCRIPTION
1
Colour
Pixel-by-Pixel
2
Monochrome/
Colour
Line-by-Line
3
Fast
Monochrome/
Colour
Line-by-Line
Yes
2MSPS The 3 input channels
are sampled in
parallel. The signal is
then gain and offset
adjusted before being
multiplexed into a
single data stream
and converted by the
ADC, giving an output
data rate of 6MSPS
max.
Yes
2MSPS As mode 1 except:
Only one input
channel at a time
is continuously
sampled.
Yes
4MSPS Identical to mode 2
4
Maximum
speed
Monochrome/
Colour
Line-by-Line
5
Slow Colour
Pixel-by-Pixel
No
6MSPS Identical to mode 2
Yes
1.5MSPS Identical to mode 1
6
Slow
Monochrome/
Colour
Line-by-Line
Yes
1.5MSPS Identical to mode 2
Table 4 WM8198 Operating Modes
TIMING
REQUIRE-
MENTS
MCLK max
= 12MHz
MCLK:
VSMP
ratio is 6:1
MCLK max
= 12MHz
MCLK:
VSMP
ratio is 6:1
MCLK max
= 12MHz
MCLK:
VSMP
ratio is 3:1
MCLK max
= 12MHz
MCLK:
VSMP
ratio is 2:1
MCLK max
= 12MHz
MCLK:
VSMP
ratio is
2n:1, n ≥ 4
MCLK max
= 12MHz
MCLK:
VSMP
ratio is
2n:1, n ≥ 4
REGISTER
CONTENTS
WITH CDS
SetReg1:
03(hex)
REGISTER
CONTENTS
WITHOUT
CDS
SetReg1:
01(hex)
SetReg1:
07(hex)
SetReg1:
05(hex)
Identical to
mode 2 plus
SetReg3:
bits 5:4 must
be set to
0(hex)
CDS not
possible
Identical to
mode 2
SetReg1:
45(hex)
Identical to
mode 1
Identical to
mode 1
Identical to
mode 2
Identical to
mode 2
Notes:
1.
In Monochrome mode, SetReg3 bits 7:6 determine which input is to be sampled.
2.
For Colour Line-by-Line, set control bit LINEBYLINE. For input selection, refer to Table 4, Colour Selection
Description in Line-by-Line Mode.
w
PD Rev 4.0 June 2004
21
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