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參數(shù)資料
| 型號(hào)： | WM8170 |
| 廠商： | Wolfson Microelectronics |
| 英文描述： | 5.0 VOLT BI-DIRECTIONAL TRANSIENT VOLTAGE SUPPRESSOR |
| 中文描述： | 3.3集成的信號(hào)處理器區(qū)陣CCD |
| 文件頁數(shù)： | 14/41頁 |
| 文件大?。?/td> | 453K |
| 代理商： | WM8170 |
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WM8170
Product Preview Rev 1.0
WOLFSON MICROELECTRONICS LTD
PP Rev 1.0 March 2000
14
DEVICE DESCRIPTION
GENERAL OPERATION
The analogue circuitry within the WM8170 consists of a Sample/Hold (S/H) block, a Programmable
Gain Amplifier (PGA), a DC Offset Correction loop, and a 10-bit 21MSPS Analogue to Digital
Converter (ADC). The Sample/Hold block takes a Correlated Double Sample (CDS) of the incoming
video. The CDS video sample is transferred differentially into the PGA block, which is used to gain
the signal to the full dynamic range of the ADC. The PGA is controlled digitally via the management
interface. The 10-bit pipeline ADC takes the output from the PGA and converts the analogue voltage
into a digital representation of the signal.
To correct for DC offsets in the input video, the Sample/Hold block and the PGA, DC offset correction
circuitry is provided under the control of external inputs. An analogue correction loop using mixed
mode circuitry removes the majority of the DC offset by summing the output of a DAC into the main
signal path. An up/down counter controlled from the output of a comparator updates the DAC. The
comparator checks the output from the PGA against a voltage representing the target black level. As
the analogue correction loop does not correct for DC offsets in either the ADC or the comparator in
the feedback loop, a further digital offset is automatically calculated within the digital section following
the ADC, which forces the digital output to the previously programmed value.
Two auxiliary 8-bit DACs are provided, which can be used within the camera system to control bias
voltages to the area CCD, or to provide DC voltages for peripheral camera functions, such as auto-
focus control.
To allow the registers within the WM8170 to be programmed a management interface is provided
which allows either serial or parallel control. The interface allows the user to both write to, and read
from the internal registers, which eases system debug as values previously programmed can
be checked.
INPUT SAMPLE AND HOLD, AND VIDEO TIMING
The WM8170 includes a Sample/Hold section at its input, which is used to acquire samples from the
analogue output of the area array CCD. The Sample/Hold is configured as shown in Figure 9, and
can be operated in a basic Sample and Hold mode or in Correlated Double Sampling (CDS) mode.
In CDS, the input video reset level is sampled under the control of the signal applied to the SHP
digital input and the input video signal level is sampled under the control of the signal applied to the
SHD digital input.
The Sample/Hold produces a differential voltage output signal, which is passed to the following PGA.
Detailed input timing of the Sample/Hold is shown in Figures 10 and 11. Note that there should be no
overlap between the SHP and SHD pulses. Any overlap will cause the WM8170 to operate
incorrectly. The WM8170 can be programmed via the management interface to accept SHP and SHD
inputs as either both positive, or both negative pulses. Control of this function is via the control bit
INVSHX.
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相關(guān)代理商/技術(shù)參數(shù) |
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| WM-8-18 | 制造商:Middle Atlantic Products 功能描述: |
| WM8181 | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:12-bit 2MSPS Serial Output CIS/CCD Digitiser |
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