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WM8191 数据表(PDF) 1 Page - Wolfson Microelectronics plc |
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WM8191 数据表(HTML) 1 Page - Wolfson Microelectronics plc |
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1 / 27 page  WM8191 14-bit 6MSPS CIS/CCD Analogue Front End/Digitiser Advanced Information, April 2001, Rev 3.1 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 www.wolfsonmicro.com Advanced Information data sheets contain preliminary data on new products in the preproduction phase of development. Supplementary data will be published at a later date. 2001 Wolfson Microelectronics Ltd . DESCRIPTION The WM8191 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 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. 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 8/7/4-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 WM8191 typically only consumes 250mW when operating from a single 5V supply and less than 1 µA when in power down mode. FEATURES • 14-bit ADC • No missing codes guaranteed • 6MSPS conversion rate • Low power – 250mW 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 8/7/4-bit wide multiplexed data output formats • Internally generated voltage references • 48-pin 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 (8) DATA I/O PORT (12) SEN/STB VSMP (15) MCLK (17) VRLC/VBIAS (2) (13) SDI/DNA (14) SCK/RNW TIMING CONTROL CL (16) RLC/ACYC RLC V S R S BINP (4) GINP (6) VRX (1) VRT (48) VREF/BIAS (11) OEB M U X M U X VRB (47) RLC RLC CDS CDS CDS R G B M U X R G B + PGA I/P SIGNAL POLARITY ADJUST 8 8 OFFSET DAC PGA 8 8 OFFSET DAC PGA 8 OFFSET DAC RLC DAC 8 4 + + + CONFIGURABLE SERIAL/ PARALLEL CONTROL INTERFACE 14- BIT ADC AVDD1-2 (43, 44) (21) OP[0] (22) OP[1] (23) OP[2] (26) OP[3] (27) OP[4] (28) OP[5] (29) OP[6] (31) OP[7] + + I/P SIGNAL POLARITY ADJUST I/P SIGNAL POLARITY ADJUST WM8191 DVDD1-3 (10, 24, 35) (32) OP[8] (33) OP[9] (34) OP[10] (37) OP[11] (38) OP[12] (39) OP[13]/SDO (42) NRESET (18, 25, 30, 36, 40) DGND1-5 (3, 5, 7, 9, 45, 46) AGND1-6 |
类似零件编号 - WM8191 |
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类似说明 - WM8191 |
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