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
Application• Flatbed scanners
• Multi-function peripherals
• Copier scanners
• CCD sensor interfaces
Pinout
Specifications
| CONDITION |
MIN |
MAX |
| Analogue supply voltage: AVDD |
GND - 0.3V |
GND + 7V |
| Digital supply voltages: DVDD1 − 2 |
GND - 0.3V |
GND + 7V |
| Digital ground: DGND |
GND - 0.3V |
GND + 0.3V |
| Analogue grounds: AGND1 − 2 |
GND - 0.3V |
GND + 0.3V |
| Digital inputs, digital outputs and digital I/O pins |
GND - 0.3V |
DVDD2 + 0.3V |
| Analogue inputs (RINP, GINP, BINP) |
GND - 0.3V |
AVDD + 0.3V |
| Other pins |
GND - 0.3V |
AVDD + 0.3V |
| Operating temperature range: TA |
0°C |
+70°C |
| Storage temperature |
-65°C |
+150°C |
| Lead temperature (soldering, 10 sec) |
|
+260°C |
| Lead temperature (soldering, 2 mins) |
|
+183°C |
Notes: 1. GND denotes the voltage of any ground pin.
2. AGND1, AGND2 and DGND pins are intended to be operated at the same potential. Differential voltages between these pins will degrade performance
DescriptionThe 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 WM8146 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.
WM8146 Data Sheet
