ZHCSIZ1G May 2010 – November 2018 LM98640QML-SP
PRODUCTION DATA.
In Sample/Hold mode, a Video Level signal and a Reference Level signal need to be presented to the LM98640QML-SP. The Reference Level signal must be connected to the OSX+ pin, and the Video Level signal connected to the OSX- pin. The output code will then be OSX+ minus OSX-, or the difference between the Reference Level and Video Level. A minimum code represents zero deviation between the Reference and Video Levels and a maximum code represents a 2-V deviation between the Reference and Video Levels with CDS and PGA gains of 1x.
The Reference Level signal can be either an external signal from the image sensor, or the VCLP pin can be externally connected to the OSX+ pin. In order to fully utilize the range of the input circuitry it is desirable to cause the Black Level signal voltage to be as close to the Reference Level voltage as possible, resulting in a near zero scale output for Black Level pixels. The LM98640QML-SP provides several methods for ensuring the Black Level signal and Reference Level are matched, these are described in the Input Bias and Clamping section.
To place the LM98640QML-SP in Sample & Hold Mode from power up, first write the baseline configuration to the registers as shown in Table 5. This configuration has Sample & Hold mode enabled by default. Next, the SAMPLE pulse must be properly positioned over the input signal using the CLAMP/SAMPLE Adjust.