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WM8146 Datasheet(PDF) 1 Page - Wolfson Microelectronics plc |
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WM8146 Datasheet(HTML) 1 Page - Wolfson Microelectronics plc |
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1 / 17 page  WM8146 12-bit (8+4-bit) Linear Sensor Image Processor Product Preview, January 2000 Rev 1.1 WOLFSON MICROELECTRONICS LTD Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK Tel: +44 (0) 131 667 9386 Fax: +44 (0) 131 667 5176 Email: sales@wolfson.co.uk http://www.wolfson.co.uk Product Preview data sheets contain specifications for products in the formative phase of development. These products may be changed or discontinued without notice. 1999 Wolfson Microelectronics Ltd . DESCRIPTION The WM8146 is a 12-bit analogue front end/digitiser IC, which processes and digitises the analogue output signals from linear CCD sensors at pixel sample rates of up to 6MSPS. 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. The output from each of these channels is time multiplexed into a single high-speed 12-bit Analogue to Digital Converter. The digital output data is available in 8+4-bit wide multiplexed format, with no missing codes. The WM8146 is controlled via a configurable serial interface, which is compatible with all of Wolfson’s imaging devices. Powered from an analogue supply voltage of 5V and a digital interface supply of either 5V or 3.3V, the WM8146 typically only consumes 175mW when operating from 5V supplies. FEATURES • No missing codes guaranteed • 6MSPS sample rate • Colour pixel by pixel or line by line sampling • Monochrome sampling • Selectable reset level clamp voltage • Pixel by pixel or line by line clamping • Correlated double sampling • 5-bit programmable gain amplifier • 8-bit + sign offset adjustment • 5V or 3.3V digital interface compatibility • Serial control interface • 28-pin SOIC package APPLICATIONS • Flatbed scanners • Multi-function peripherals • Copier scanners • CCD sensor interfaces BLOCK DIAGRAM + + OFFSET + + + + M U X RINP GINP(28) BINP(27) TIMING CONTROL VSMP (5) MCLK (7) RLC (6) DGND (8) 12-bit ADC 8+4 M U X CONFIGURABLE SERIAL CONTROL INTERFACE SDI SCK SEN MUX VMID VRLC (26) VRT (24) VRB (23) VMID (25) CL RS VS AGND2 (2) VMID OFFSET OFFSET PGA PGA 5-BIT REG CDS 5-BIT REG 5-BIT REG PGA VMID VMID CDS CDS S/H S/H S/H S/H S/H S/H 8-BIT + SIGN DAC 8-BIT + SIGN DAC 8-BIT + SIGN DAC WM8146 DVDD1 (3) DVDD2 (10) AGND1 (22) AVDD (21) (9) (12) (11) OEB (4) (13) OP[0] (14) OP[1] (20) (15) (16) (17) (18) (19) OP[2] OP[3] OP[4] OP[5] OP[6] OP[7] (1) |
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