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WM8253 数据表(PDF) 1 Page - Wolfson Microelectronics plc |
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WM8253 数据表(HTML) 1 Page - Wolfson Microelectronics plc |
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1 / 27 page  w WM8253 Single Channel 16-bit CIS/CCD AFE with 4-bit Wide Output WOLFSON MICROELECTRONICS plc To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews Production Data, August 2011, Rev 4.1 Copyright 2011 Wolfson Microelectronics plc DESCRIPTION The WM8253 is a 16-bit analogue front end/digitiser IC which processes and digitises the analogue output signals from CCD sensors or Contact Image Sensors (CIS) at pixel sample rates of up to 6MSPS. The device includes a complete signal processing channel containing Reset Level Clamping, Correlated Double Sampling, Programmable Gain and Offset adjust functions. Internal multiplexers allow fast switching of offset and gain for line-by-line colour processing. The output from this channel is time multiplexed into a high-speed 16-bit Analogue to Digital Converter. The digital output data is available in 4-bit wide multiplexed format. An internal 4-bit DAC is supplied for internal reference level generation. This may be used during CDS to reference CIS signals or during Reset Level Clamping to clamp CCD signals. An external reference level may also be supplied. ADC references are generated internally, ensuring optimum performance from the device. The device uses an analogue supply voltage of 3.3V and a digital interface supply of between 2.5V and 3.3V. The WM8253 typically only consumes 132mW when operating from a single 3.3V supply. FEATURES 16-bit ADC 6MSPS conversion rate Low power - 132mW typical 3.3V single supply or 3.3V/2.5V dual supply operation Single channel operation Correlated double sampling Programmable gain (8-bit resolution) Programmable offset adjust (8-bit resolution) Programmable clamp voltage 4-bit wide multiplexed data output format Internally generated voltage references 20-lead SSOP package Serial control interface APPLICATIONS Flatbed and sheetfeed scanners USB compatible scanners Multi-function peripherals High-performance CCD sensor interface BLOCK DIAGRAM VRLC/VBIAS VSMP MCLK SCK TIMING GENERATION AND CONTROL CL RLC V S R S VRT VRB CDS 4 CONFIGURABLE SERIAL CONTROL INTERFACE 16-BIT ADC AGND2 DGND AVDD OP[0] OP[1] OP[2] OP[3]/SDO VREF/BIAS PGA I/P SIGNAL POLARITY ADJUST DATA I/O PORT DVDD1 WM8253 OFFSET DAC + + MUX 8 MUX 8 RG B RG B RLC DAC VINP SDI SEN AGND1 DVDD2 |
类似零件编号 - WM8253 |
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类似说明 - WM8253 |
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