WM8224 datasheet(31/50 Pages) WOLFSON

Part #	WM8224

Description	60MSPS 3-Channel AFE with Multiple Device Operation and Programmable Automatic Black Level Calibration

PDF	50 Pages

Scroll/Zoom	100%

Manufacturer	WOLFSON [Wolfson Microelectronics plc]

Direct Link	http://www.wolfsonmicro.com

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31 / 50 page

WM8224

Production Data

PD, Rev 4.1, June 2012

BLC SCENARIOS OF OPERATION

The BLC can be used in various ways to suit the application, for example calibration can be done

once per page or once per line. Register set up should be carried out before the start of a frame and

is not required to be done on a line by line basis if using the Method 1 OEB PIN method.

Five

potential scenarios of operation are suggested below.

Note: The registers FRAME_START and SEQ_START when set high by the user will automatically

be set low by the device.

SCENARIO 1

Coarse Adjust Calibration enabled for the 1

st line, Fine Adjust Calibration enabled every line with the

Fine Adjust Calibration result recalculated every line. This scenario is suitable for dealing with large

amounts of d.c. drift throughout a frame; but this is at a cost of potential line-by-line variation in the

Fine Adjust result (dependent on sensor noise and the PGA gain). Table 6 shows which registers are

required for this scenario with example settings.

SETUP

BPIX_AVAIL

CADUR

FRAME_START

FA_EVERYLINE

Value

Table 6 Example Register Settings for Scenario 1

Figure 27 Scenario 1

WM8224 Datasheet(PDF) 31 Page - Wolfson Microelectronics plc