LM98722CCMTSLASHNOPB datasheet(35/150 Pages) TI1

35 / 150 page

Color 1 Even Offset

Color 1 Odd Offset

Color 2 Even Offset

Color 1 Odd Offset

Color 3 Even Offset

Color 1 Odd Offset

16 Bit ADC

Digital

Offset

LM98722

www.ti.com

SNAS487B – SEPTEMBER 2009 – REVISED MARCH 2015

7.4.10.2 Digital Offset

In addition, digital offset can be added to color data at the output of the ADC in the Digital Offset block. The

digital offsets are a +/- 6 bit value. This value is summed with the upper 11 bits of the ADC output. Therefore, the

effective offset range is from +2016 to -2048 lsbs of the ADC output.

The digital offset registers are found at Page 1, Registers 0x10h to 0x15h.

Figure 13. Digital Offset Applied to ADC Output

7.4.10.3 Even/Odd Offset Coefficients

Certain CCD sensors may have different offset voltages for the Even versus the Odd pixels. To optimize the

image processing of these pixels, separate coefficients can be stored, and applied for the Even and Odd pixels.

The Even/Odd offset feature is enabled by setting Page 0, Register 0x02h, Bit 0 = 1. Bimodal correction,

discussed below, is automatically disabled when Even/Odd offset coefficients are enabled.

Figure 14.

•

Analog Gain

–

The gain of each input channel can be adjusted at two points in the signal chain.

•

CDS/SH Gain - Page 1, Register 0x00h

–

A 1x or 2x gain setting is available in the CDS/SH amplifier.

–

By default, one common CDS/SH gain setting setting is used for all input channels. If desired, individual

CDS/SH gain settings can be used for each input. To enable this feature, set Page 1, Register 0x00h, Bit

2 = 1.

•

PGA Gain - Page 1, Registers 0x01h, 0x02h, 0x03h

–

An 8 bit PGA (Programmable Gain Amplifier) is also available. The PGA gain curve is non-linear for

optimal performance in imaging applications, and is shown on Figure 15. The approximate gain equation

is:

Gain (V/V) = 180/(277-PGA_Code), Gain (dB) = 20log10(180/(277-PGA_Code))

(1)

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