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WM8195 Datasheet(PDF) 1 Page - Wolfson Microelectronics plc |
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WM8195 Datasheet(HTML) 1 Page - Wolfson Microelectronics plc |
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1 / 33 page  w WM8195 14-bit 12MSPS CIS/CCD Analogue Front End/Digitiser WOLFSON MICROELECTRONICS plc To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews/ Production Data July 2005 Rev 4.1 Copyright 2005 Wolfson Microelectronics plc. DESCRIPTION The WM8195 is a 14-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 12MSPS. 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 14-bit analogue-to-digital converter. The digital output data is available in 14-bit parallel or 8, 7 or 4-bit wide multiplexed format, with no missing codes. 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. Alternatively an external reference level may be applied. 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 WM8195 typically only consumes 210mW when operating from a single 5V supply and less than 20 µA when in power down mode. FEATURES • 14-bit ADC • No missing codes guaranteed • 12MSPS conversion rate • Low power – 210mW 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 • 14-bit parallel or 8, 7 or 4-bit wide multiplexed data output formats • Internally generated voltage references • 48-lead TQFP package • Serial or parallel control interface APPLICATIONS • Flatbed and sheetfeed scanners • USB compatible scanners • Multi-function peripherals • High-performance CCD sensor interface BLOCK DIAGRAM M U X RINP DATA I/O PORT SEN/STB VSMP MCLK VRLC/VBIAS SDI/DNA SCK/RNW TIMING CONTROL CL RLC/ACYC RLC V S R S BINP GINP VRX VREF/BIAS OEB M U X VRB RLC RLC CDS CDS CDS R G B M U X R G B + PGA I/P SIGNAL POLARITY ADJUST 8 8 PGA 8 8 PGA 8 8 4 + + + CONFIGURABLE SERIAL/ PARALLEL CONTROL INTERFACE 14- BIT ADC AVDD1-2 OP[0] OP[1] OP[2] OP[3] OP[4] OP[5] OP[6] OP[7] + + I/P SIGNAL POLARITY ADJUST I/P SIGNAL POLARITY ADJUST DVDD1-3 OP[8] OP[9] OP[10] OP[11] OP[12] OP[13]/SDO NRESET DGND1-5 AGND1-6 VRT w WM8195 OFFSET DAC OFFSET DAC OFFSET DAC M U X RLC DAC |
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