WM8253SCDS/RV

Overview

The WM8253SCDS/RV is a single-channel 16-bit analogue front-end and digitiser IC designed for CCD and CIS sensors. It processes signals at pixel sample rates up to 6MSPS, featuring Reset Level Clamping (RLC), Correlated Double Sampling (CDS), an 8-bit Programmable Gain Amplifier (PGA), and an 8-bit offset DAC. The device outputs 16-bit data in a 4-bit wide multiplexed format via pins OP A-D. It operates on a 3.3V analogue supply and a 2.5V–3.3V digital I/O supply, consuming approximately 132mW. Configuration is managed through a serial control interface.

Feature Summary

• 16-bit ADC with 6MSPS maximum conversion rate
• Integrated signal processing: RLC, CDS, 8-bit PGA, and 8-bit offset DAC
• 4-bit wide multiplexed digital output format
• Internal voltage references and 4-bit RLC DAC

Applications

• Flatbed scanners
• Sheetfeed scanners
• USB compatible scanners
• Multi-function peripherals
• High-performance CCD sensor interfaces

Procurement Notes

Verify the ordering suffix RV indicates tape and reel packaging with a reel quantity of 2,000 units. Confirm the temperature range is 0°C to 70°C and the package is a 20-lead SSOP. Ensure compatibility with MSL3 moisture sensitivity levels requiring storage within 168 hours out of bag at <30°C / 60% Relative Humidity.

Selection Notes

Select this component for applications requiring a single-channel high-speed digitiser for CCD or CIS sensors. Ensure the system provides a master clock (MCLK) up to 36MHz and a video sample synchronisation pulse (VSMP) up to 6MHz. Verify that the host controller supports the required serial interface protocol for register configuration and read-back.

Part Context

This part is manufactured by Wolfson Microelectronics plc, now part of Cirrus Logic Inc. The specific suffix SCDS/RV denotes the 20-lead SSOP package in tape and reel form. The document revision is 4.1, dated August 2011. It serves as a dedicated analogue front-end solution for imaging systems requiring precise signal conditioning before digitisation.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Evaluate alternatives based on matching 16-bit resolution, 6MSPS speed, single-channel architecture, and 4-bit multiplexed output interface requirements.

FAQ

What is the maximum pixel sample rate supported by the WM8253?

The device supports pixel sample rates of up to 6MSPS.

How is the digital output data formatted?

The 16-bit ADC output data is available in a 4-bit wide multiplexed format across four output pins (OP A, B, C, D).

Can the WM8253 handle line-by-line colour processing?

Yes, internal multiplexers allow fast switching of offset and gain registers for Red, Green, and Blue channels to facilitate line-by-line colour processing.