參數(shù)資料
型號(hào)： TVP70025IPZPR
廠(chǎng)商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP100
封裝： GREEN, PLASTIC, HTQFP-100
文件頁(yè)數(shù)： 4/59頁(yè)
文件大?。?/td> 519K
代理商： TVP70025IPZPR
SLES232B
– JUNE 2008 – REVISED MAY 2011
FUNCTIONAL DESCRIPTION
Analog Channel
The TVP70025I contains three identical analog channels that are independently programmable. Each channel
consists of a clamping circuit, programmable gain control, programmable offset control, and an A/D converter.
Analog Input Switch Control
TVP70025I has three analog channels that accept up to ten video inputs. The user can configure the internal
analog video switches via the I2C interface. The ten analog video inputs can be used for different input
configurations, some of which are:
Up to three SDTV, EDTV, or HDTV component video inputs (limited by number of SOG inputs)
Up to two 5-wire PC graphics inputs (limited by number of HSYNC and VSYNC inputs)
The input selection is performed by the input select register at I2C subaddress 19h a 1Ah (see Input
Mux Select 1 and Input Mux Select 2).
Supported Video Formats
The TVP70025I supports A/D conversion of SDTV (480i, 576i), EDTV (480p, 576p), and HDTV YPbPr
component video inputs up to 74.25 MSPS. The TVP70025I also supports A/D conversion and color space
conversion of all standard PC graphics formats (RGB) from VGA up to UXGA. The internal sync separator
provides support for field rates (VSYNC frequencies) at or above 40 Hz. Separated VSYNC or an external sync
separator must be used to support formats having field rates less than 40 Hz. A summary of the analog video
standards supported by the TVP70025I is show in Table 3.
Table 3. Analog Video Standards
VIDEO FORMAT
VIDEO STANDARDS
SDTV (YPbPr Component)
480i, 576i
EDTV (YPbPr Component)
480p, 576p
720p50, 720p60,
HDTV (YPbPr Component)
1080i50, 1080i60
PC graphics (RGB Component)
VGA - XGA 75Hz, WXGA
SCART (RGB Component)
576i
Analog Input Clamping
The TVP70025I provides dc restoration for all analog video inputs including the SOG slicer inputs. The dc
restoration circuit (a.k.a. clamp circuit) restores the ac-coupled video signal to a fixed dc level. One dc restoration
circuit is implemented prior to each of the three A/D converters, and a fourth one is located prior to the SOG
slicer. The dc restoration circuit can be programmed to operate as either a sync-tip clamp (a.k.a. coarse clamp)
or a back-porch clamp (a.k.a. fine clamp). The sync-tip clamp always clamps the video sync-tip level near the
bottom of the A/D converter range. The back-porch type clamp supports two clamping levels (bottom level and
mid level) that are selectable using bits 0, 1, and 2 of register 10h. When using the fine bottom-level clamp, an
optional 300-mV common-mode offset may be selected using bit 7 of register 2Ah.
In general, the analog video input being used for horizontal synchronization purposes should always use the
sync-tip clamp; all other analog video inputs should use the back-porch clamp. The advantage of the back-porch
clamp is that it has negligible video droop or tilt across a video line.
12
Copyright
2008–2011, Texas Instruments Incorporated
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