- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄98229 > THS8083APZP (TEXAS INSTRUMENTS INC) SPECIALTY CONSUMER CIRCUIT, PQFP100 PDF資料下載
參數(shù)資料
| 型號： | THS8083APZP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
| 封裝： | GREEN, PLASTIC, HTQFP-100 |
| 文件頁數(shù)： | 9/63頁 |
| 文件大?。?/td> | 320K |
| 代理商： | THS8083APZP |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁當(dāng)前第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁
34
3.3.1
Implementation When Using Channel 1 Sync Slicing From Ch1 as Selected by CS_SEL,
or on Prerevision A Silicon
To support sync-on-Y/sync-on-G extraction, users should provide an external dc biasing to the Y/G channel. This can
be done by establishing a dc clamp through a diode with its cathode connected to the ac-coupling capacitor (at the
side of the THS8083A) on the AGY channel and its anode connected to a dc level. Since the slicing level is
approximately 1.35 V and the sync amplitude is 300 mV, the negative sync-tip should be clamped by the diode to
a level of approximately 1.2 V. For example, using a Schottky switching diode (type 1N5711) with a maximum low
forward voltage drop of 0.4 V, the dc level at the anode can be approximately 1.6 V. This level can be derived through
a resistive voltage divider off the power supply.
3.4
Programmable Gain Amplifier (PGA)
Each video channel is passed through a programmable gain amplifier, to provide a full-scale signal to each A/D. The
user can change this gain via register programming. A gain change becomes effective immediately.
The range of the PGA is such that an input ac range from 0.4 Vpp to 1.2 Vpp can be scaled to ADC full scale, by
maximum gain and minimum gain settings respectively.
The PGA is split into a 6-bit coarse gain control and 5-bit fine gain control. Their combination leads to a PGA resolution
of better than 1 LSB on the ADC output code.
The bandwidth of the PGA is by design constant, resulting in a constant analog video input bandwidth.
The coarse PGA, with its 64 settings, covers a 4/3 x to 4x gain change, used for a 0.4 V (0.4 Vpp
× 4 = 1.6 Vpp)
respectively 1.2 Vpp (1.2 Vpp
× 4/3 = 1.6 Vpp) input range swing.
While an amplifier with variable gain implements the coarse PGA, the fine PGA is implemented by slightly changing
the top and bottom reference levels that are also independently controllable for each ADC channel. The fine range,
with its 32 settings, covers a range of 16 LSBs.
The fine and coarse PGA settings can be combined into a single PGA gain formula as follows:
GAIN = (4/3 + C/24)(1 + (F15)/512)
Where C is the coarse gain setting (0..63) and F the fine gain setting (0..31).
3.5
A/D Converter
The A/D converter’s switched-capacitor single-pipeline CMOS architecture combines excellent signal-to-noise
characteristics with a very wide 3-dB analog input bandwidth of typically 500 MHz. The A/D block contains an internal
reference voltage generator, providing stable bottom and top references derived from an internal bandgap reference.
The reference voltages are made available externally. The THS8083A supports both dc and ac-coupled inputs
(clamping disabled). With dc-coupling, available external references can be used to level-shift the input signal.
The A/D converter is assured up to 80 MSPS with no missing codes. The sampling clock of the A/D converter is either
externally fed or internally generated by the PLL.
3.6
PLL
The PLL is a fully contained functional block consisting of:
An analog PLL operating at a fixed output frequency of N times the master (crystal) clock frequency
A digital PLL containing a digital phase-frequency detector (PFD), a discrete time oscillator (DTO), a digital
loop filter, a feedback divider, a programmable clock output divider, and a programmable phase shifter
3.6.1
Analog PLL
The analog PLL generates a high-frequency internal clock used by the DTO in the digital PLL to derive the pixel output
frequency with programmable phase. The reference signal for this PLL is the master clock frequency supplied on the
XTL1-MCLK terminal.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| THS8083APZPG4 | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
| THS8083CPZP | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
| THS8133ACPHP | PARALLEL, WORD INPUT LOADING, 0.005 us SETTLING TIME, 10-BIT DAC, PQFP48 |
| THS8133BCPHP | PARALLEL, WORD INPUT LOADING, 0.005 us SETTLING TIME, 10-BIT DAC, PQFP48 |
| THS8133BCPHPG4 | PARALLEL, WORD INPUT LOADING, 0.005 us SETTLING TIME, 10-BIT DAC, PQFP48 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| THS8083APZP | 制造商:Texas Instruments 功能描述:8BIT ADC 80MSPS TRIPLE SMD 8083 |
| THS8083APZPG4 | 功能描述:視頻模擬/數(shù)字化轉(zhuǎn)換器集成電路 Tr 8B 95MSPS 3.3V Vid & Graphics Dig RoHS:否 制造商:Texas Instruments 輸入信號類型:Differential 轉(zhuǎn)換器數(shù)量:1 ADC 輸入端數(shù)量:4 轉(zhuǎn)換速率:3 Gbps 分辨率:8 bit 結(jié)構(gòu): 輸入電壓:3.3 V 接口類型:SPI 信噪比: 電壓參考: 電源電壓-最大:3.45 V 電源電壓-最小:3.15 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:TCSP-48 封裝:Reel |
| THS8083CPZP | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| THS8083EVM | 制造商:Texas Instruments 功能描述:THS8083EVM - Bulk |
| THS8083T | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Triple 8-Bit, 80 MSPS, 3.3-V Video and Graphics Digitizer With Digital PLL |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。