STV2310 datasheet(15/112 Pages) STMICROELECTRONICS

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STV2310

Functional Description

magnitude by ±6 dB in 63 logarithmic steps to the optimal range of the A/D Converter. The video

signal then goes through an external anti-aliasing filter before reaching the A/D Converter. The A/D

Converter dedicated to the CVBS/Y channel has a 10-bit resolution. The A/D Converters dedicated

to the C, R_Cr, G and B_Cb channels have an 8-bit resolution.

Two independent CVBS sources can be connected to the STV2310. To process S-Video signals,

the luma signal is connected to one of the CVBS inputs and the chroma signal is connected to the

C input. RGB signals are directly connected to the three separate inputs (R_Cr, G and B_Cb). For

Analog YCrCb signals, the luma signal is connected to one of the CVBS inputs, the Cr signal is

connected to the R_CR input and the Cb signal is connected to the B_CB input.

For S-Video signals, the Y (luminance) signal is connected to the selected CVBS input. The analog

C (chrominance) input includes a bias and fixed gain circuit. The C signal is digitized by an 8-bit A/

D Converter. It is recommended that an external anti-aliasing filter be added before the C input.

Figure 6: Anti-Aliasing FIlter for CVBS Input Signals

Figure 7: Anti-Aliasing FIlter for Chroma Input Signals

ADC

VIDEOOUT

470

Ω

150

Ω

VIDEOCOMM

22 nF

C_AV

STV2310 データシート(PDF) 15 Page - STMicroelectronics