STV2310D STMicroelectronics, STV2310D Datasheet - Page 14

• Manufacturer Part Number: STV2310D
• Description: Video ICs Digital Video Decodr
• Manufacturer: STMicroelectronics
• Type: High Quality front end videor

Specifications of STV2310D

• Maximum Operating Temperature: + 70 C
• Package / Case: TQFP-64
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Functional Description
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4
4.1
4.1.1
R_CR
B_CB
FB
CVBS1/Y
CVBS2/Y
G
C
Functional Description
Analog Input Stage
General Description
The Analog Input Stage provides the interface between the incoming video signals and the Analog-
to-Digital Converters (ADC) using Clamp and Automatic Gain Control (AGC) stages to fit the analog
signals to the ADC range.
Several video sources are processed in this stage:
The CVBS/Y signal from the selected input channel goes through an automatic clamp and a
Programmable Gain Amplifier (PGA) circuit. The clamping circuit automatically adjusts the black
level to a programmable A/D output digital code. The clamp voltage is stored on the input coupling
capacitor (22 nF, external to the STV2310). The PGA automatically adjusts the input signal
●
●
●
●
CVBS signals from a broadcast signal or the SCART connector.
S-Video (Y/C) signals coming from an external video source (VCR, DVD, STB).
RGB signals with Fast Blanking (FB) input coming from the SCART connector.
Analog YCrCb signals coming from a DVD player (1H interlaced).
Figure 5: Analog Input Stage Functional Block Diagram
Composite and Luminance Input Channels
Chrominance Input Channel
RGB and Fast Blanking Input Channels
ADC Bias 2
Analog
Switch
Controller
Controller
Controller
Chroma Bias
CVBS Clamp
Control
R_CR Clamp Control
B_CB Clamp Control
G Clamp Control
ADC Bias 1
PGA
Anti-Aliasing Filter
±6 dB
Interpolator
6-bit
10-bit
8-bit
ADC
8-bit
ADC
ADC
8-bit
ADC
8-bit
ADC
STV2310