WM8146 查看數據表（PDF） - Wolfson Microelectronics plc
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WM8146 Datasheet PDF : 17 Pages
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WM8146
internal signals to control the sampling of the video signal. MCLK to VSMP ratios and maximum
sample rates for the various modes are shown in Table 1.
POWER SUPPLY
The WM8146 can run from a 5V single supply or from split 5V (core) and 3.3V (digital interface)
supplies.
OPERATING MODES
Table 1 summarises the most commonly used modes, the clock waveforms required and the register
contents required for CDS and non-CDS operation.
MODE
1
2
3
4
5
6
DESCRIPTION
Colour
Pixel-by-Pixel
Monochrome/
Colour
Line-by-Line
Fast
Monochrome/
Colour
Line-by-Line
Maximum
speed
Monochrome/
Colour
Line-by-Line
Slow Colour
Pixel-by-Pixel
Slow
Monochrome/
Colour
Line-by-Line
CDS
AVAILABLE
MAX
SAMPLE
RATE
Yes
2MSPS
Yes
2MSPS
Yes
4MSPS
No
6MSPS
Yes
1.5MSPS
Yes
1.5MSPS
SENSOR
INTERFACE
DESCRIPTION
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.
As mode 1 except:
Only one input
channel at a time
is continuously
sampled.
Identical to mode 2
Identical to mode 2
Identical to mode 1
Identical to mode 2
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
CONTROL
BIT CDS=1
SetReg1:
03(hex)
SetReg1:
07(hex)
SetReg3 bits
7:6
determine
which input is
to be
sampled
Identical to
mode 2 plus
SetReg3: bits
5:4 must be
set to 0(hex)
CDS not
possible
Identical to
mode 1
Identical to
mode 2
REGISTER
CONTENTS
WITH
CONTROL
BIT CDS=0
SetReg1:
01(hex)
SetReg1:
05(hex)
SetReg3
bits 7:6
determine
which input
is to be
sampled
Identical to
mode 2
SetReg1:
45(hex)
SetReg3
bits 7:6
determine
which input
is to be
sampled
Identical to
mode 1
Identical to
mode 2
Table 1 WM8146 Operating Modes
WOLFSON MICROELECTRONICS LTD
PP Rev 1.1 January 2000
11
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