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參數(shù)資料
| 型號： | WM8196 |
| 廠商： | Wolfson Microelectronics |
| 英文描述： | (8+8)BIT OUTPUT 16-BIT CIS/CCD AFE/DIGITISER |
| 中文描述： | （8）位輸出16位獨聯(lián)體/防治荒漠化公約AFE的/數(shù)字轉換器 |
| 文件頁數(shù)： | 11/30頁 |
| 文件大小： | 366K |
| 代理商： | WM8196 |
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WM8196
Production Data
w
PD Rev 4.1 July 2005
11
DEVICE DESCRIPTION
INTRODUCTION
A block diagram of the device showing the signal path is presented on Page 1.
The WM8196 samples up to three inputs (RINP, GINP and BINP) simultaneously. The device then
processes the sampled video signal with respect to the video reset level or an internally/externally
generated reference level using either one or three processing channels.
Each processing channel consists of an Input Sampling block with optional Reset Level Clamping
(RLC) and Correlated Double Sampling (CDS), an 8-bit programmable offset DAC and an 8-bit
Programmable Gain Amplifier (PGA).
The ADC then converts each resulting analogue signal to a 16-bit digital word. The digital output from
the ADC is presented on an 8-bit wide bi-directional bus, with optional 8 or 4-bit multiplexed formats.
On-chip control registers determine the configuration of the device, including the offsets and gains
applied to each channel. These registers are programmable via a serial interface.
INPUT SAMPLING
The WM8196 can sample and process one to three inputs through one or three processing channels
as follows:
Colour Pixel-by-Pixel:
The three inputs (RINP, GINP and BINP) are simultaneously sampled for
each pixel and a separate channel processes each input. The signals are then multiplexed into the
ADC, which converts all three inputs within the pixel period.
Monochrome:
A single chosen input (RINP, GINP, or BINP) is sampled, processed by the
corresponding channel, and converted by the ADC. The choice of input and channel can be changed
via the control interface, e.g. on a line-by-line basis if required.
Colour Line-by-Line:
A single chosen input (RINP, GINP, or BINP) is sampled and multiplexed into
the red channel for processing before being converted by the ADC. The input selected can be
switched in turn (RINP
→
GINP
→
BINP
→
RINP…) together with the PGA and Offset DAC control
registers by pulsing the RLC/ACYC pin. This is known as auto-cycling. Alternatively, other sampling
sequences can be generated via the control registers. This mode causes the blue and green
channels to be powered down. Refer to the Line-by-Line Operation section for more details.
RESET LEVEL CLAMPING (RLC)
To ensure that the signal applied to the WM8196 lies within its input range (0V to AVDD) the CCD
output signal is usually level shifted by coupling through a capacitor, C
IN.
The RLC circuit clamps the
WM8196 side of this capacitor to a suitable voltage during the CCD reset period.
A typical input configuration is shown in Figure 6. An internal clamp pulse, CL, is generated from
MCLK and VSMP by the Timing Control Block. When CL is active the voltage on the WM8196 side of
C
IN
, at RINP, is forced to the VRLC/VBIAS voltage (V
VRLC
) by closing of switch 1. When the CL
pulse turns off switch 1 opens, the voltage at RINP initially remains at V
VRLC
but any subsequent
variation in sensor voltage (from reset to video level) will couple through C
IN
to RINP.
RLC is compatible with both CDS and non-CDS operating modes, as selected by switch 2. Refer to
the CDS/non-CDS Processing section.
相關PDF資料 |
PDF描述 |
|---|---|
| WM8199 | 20MSPS 16-bit CCD Digitiser |
| WM8199CDR | TVS BIDIRECT 400W 60V SMA |
| WM8199CDS | TVS UNIDIRECT 400W 64V SMA |
| WM8199SCDR | 20MSPS 16-bit CCD Digitiser |
| WM8199SCDS | 20MSPS 16-bit CCD Digitiser |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| WM8196_07 | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:(8 + 8) Bit Output 16-bit CIS/CCD AFE/Digitiser |
| WM8196SCDS | 功能描述:模數(shù)轉換器 - ADC 16-Bit 12MSPS 3-Channel AFE RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| WM8196SCDS/R | 功能描述:模數(shù)轉換器 - ADC 16-Bit 12MSPS 3-Channel AFE RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| WM8196SCDS/RV | 功能描述:模數(shù)轉換器 - ADC 16-Bit 12MSPS 3-Channel AFE RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| WM8196SCDS/V | 功能描述:模數(shù)轉換器 - ADC 16-Bit 12MSPS 3-Channel AFE RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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