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WM8199SCDS Scheda tecnica(PDF) 1 Page - Wolfson Microelectronics plc |
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WM8199SCDS Scheda tecnica(HTML) 1 Page - Wolfson Microelectronics plc |
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1 / 30 page  WM8199 20MSPS 16-bit CCD Digitiser WOLFSON MICROELECTRONICS plc w :: www.wolfsonmicro.com Production Data, November 2003, Rev 3.2 Copyright 2003 Wolfson Microelectronics plc DESCRIPTION The WM8199 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 20MSPS. The device includes three analogue signal processing channels each of which contains Reset Level Clamping, Correlated Double Sampling and Programmable Gain and Offset adjust functions. Three multiplexers allow single channel processing. The output from each of these channels is time multiplexed into a single high-speed 16-bit Analogue to Digital Converter. The digital output data is available in 8 or 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. Using an analogue supply voltage of 5V and a digital interface supply of either 5V or 3.3V, the WM8199 typically only consumes 358mW when operating from a single 5V supply. FEATURES • 16-bit ADC • 20MSPS conversion rate • 30MSPS conversion rate at 8-bits • Low power – 358mW typical • 5V single supply or 5V/3.3V dual supply operation • Single or 3 channel operation • Correlated double sampling • Programmable gain (8-bit resolution) • Programmable offset adjust (8-bit resolution) • Programmable clamp voltage • 8 or 4-bit wide multiplexed data output formats • Internally generated voltage references • 28-pin SSOP package • Serial control interface APPLICATIONS • Flatbed and sheetfeed scanners • USB compatible scanners • Multi-function peripherals • High-performance CCD sensor interface BLOCK DIAGRAM RINP DATA I/O PORT SEN VSMP MCLK VRLC/VBIAS SDI SCK DVDD2 TIMING CONTROL CL RLC/ACYC RLC V S R S BINP GINP VRX VRT OEB M U X VRB RLC RLC CDS CDS CDS RLC DAC 4 CONFIGURABLE SERIAL CONTROL INTERFACE 16- BIT ADC AGND1 DGND DVDD1 OP[0] OP[1] OP[2] OP[3] OP[4] OP[5] OP[6] OP[7]/SDO AGND2 M U X VREF/BIAS M U X R G B M U X R G B + PGA I/P SIGNAL POLARITY ADJUST 8 8 PGA 8 8 OFFSET DAC PGA 8 OFFSET DAC 8 + + + + + I/P SIGNAL POLARITY ADJUST I/P SIGNAL POLARITY ADJUST AVDD w WM8199 OFFSET DAC |
Codice articolo simile - WM8199SCDS |
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