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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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WM8148 bảng dữ liệu(PDF) 1 Page - Wolfson Microelectronics plc |
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WM8148 bảng dữ liệu(HTML) 1 Page - Wolfson Microelectronics plc |
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1 / 43 page  WM8148 12-bit/12MSPS CCD/CIS Analogue Front End/Digitiser Production Data, April 1999, Rev 4.0 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 Production Data contain final specifications current on publication date. Supply of products conforms to Wolfson Microelectronics' Terms and Conditions. ©1999 Wolfson Microelectronics Ltd . DESCRIPTION The WM8148 is a 12-bit, 12MSPS analogue front end/ digitiser IC, which interfaces to colour or monochrome linear array CCDs or contact image sensors (CIS). The device includes all the signal conditioning circuitry required to process the analogue signals from the CCD or CIS prior to the internal ADC. Three signal-processing channels are included in the device. Each channel features reset level clamping, correlated double sampling (CDS), offset correction and programmable gain amplification (PGA). The output signal from each channel is then multiplexed into a high performance 12-bit analogue to digital converter (ADC). The reset level clamp and/or CDS functions can be selected or bypassed depending on the application. The WM8148 can be operated in several modes. The operational mode of the device, including the sampling scheme and power management is programmed via the serial/parallel control interface. Output data is presented in either 12-bit parallel or byte- wide (8+4-bit) format. FEATURES • Correlated double sampling • Programmable gain amplifier • Programmable input clamp voltage • Offset correction • 12-bit, 12MSPS ADC • Internal voltage reference • 12-bit or 8+4 bit data output mode • Single 5V supply or 5V analogue/3.3V digital supply • Programmable sample timing • Control interface compatible with previous Wolfson AFEs • 48-pin TQFP package APPLICATIONS • Flatbed scanners • Document scanners • Multi-function peripherals (MFPs) • Colour copiers • Character recognition systems • Linear array CCDs • Contact image sensors (CIS) BLOCK DIAGRAM RINP (36) GINP (37) VRLC (33) MUX TIMING CONTROL CONFIGURABLE SERIAL/PARALLEL CONTROL INTERFACE (45) SDI/DNA (46) SCK/RNW (47) SEN/STB (42) NRESET (43) OEB OP[11:0] (9-12,14-21) VREF/BIAS VRT (31) BINP (39) 12-BIT ADC 12/8 BIT MUX (48) PNS (44) SDO (34) OVRD OFFSET DAC + + OFFSET DAC + + OFFSET DAC + + AVDD 1- 4 (41,28,27,3) DVDD1-2 (1,13) VSMP (7) PGA PGA PGA 4 8 8 8 6 6 6 CDS RLC CDS RLC CDS RLC (8,24,4,26) DGND1 - 4 (35,40,30,25,6) AGND1 - 5 MCLK (5) RLC (2) VRB (29) VRX (32) ± FULL SCALE 2 _ .. ± FULL SCALE 2 _ .. ± FULL SCALE 2 _ .. RLC DAC CL R S VS WM8148 |
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Mô tả tương tự - WM8148 |
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