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參數(shù)資料
| 型號： | FMS9875KGC140X |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | ADC |
| 英文描述： | 3-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP100 |
| 封裝： | MQFP-100 |
| 文件頁數(shù)： | 31/31頁 |
| 文件大?。?/td> | 517K |
| 代理商： | FMS9875KGC140X |
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FMS9875
PRODUCT SPECIFICATION
REV. 1.2.15 1/14/02
9
Functional Description
There are two major sections within the FMS9875:
1.
Analog-to-digital Converter Channels, one for each
channel, GY, RP, BP and the voltage reference.
2.
Timing and Control comprising the PLL, Timing
Generator, Sync Stripper and Serial Interface.
A/D Converter Channels
Each of the RGB/YPBPR channels consists of:
1.
A clamp to set the lower reference of each G/Y, B and R
channel or the midpoint reference of the PB and PR
channels.
2.
Gain and offset stages to match the A/D converter range
to input signal levels.
3.
An Analog-to-Digital Converter to digitize the analog
input.
A plot of output codes versus input voltage has a staircase-
like shape. With FMS9875 Gain and Offset register values
set to match a nominal 700 mV input, Tables 1 and 2 show
the output codes in deciminal and binary, corresponding to
the mid-point input voltages of each step.
Note:
1.
The midpoint of code 000 lies 1/2 of one code-size
below the 000/001 transition.
2.
The midpoint of code 255 lies 1/2 of one code-size
above the 254/255 transition.
3.
For AC coupled inputs, during the blanking period:
a) Y, G, B and R inputs should be clamped to the
FMS9875 bottom reference.
b) PB and PR inputs should be clamped to the FMS9875
mid-range level. (Half the range plus the offset
voltage)
Table 1. YPBPR and GBR Decimal Output Coding
Table 2. YPBPR and GBR Binary Output Coding
Input (mV)
Y, G, B, R
PB, PR
Offset Binary
Two’s Complement
700
255
127
697.25
254
126
351.37
128
000
348.63
127
255
345.88
126
254
2.75
001
129
0
000
128
Input (mV)
Y, G, B, R
PB, PR
350 mV ref.
0 mV ref.
Offset Binary
Two’s Complement
700
350
1111 1111
0111 1111
697.25
347.25
1111 1110
0111 1110
351.37
1.37
1000 0000
0000 0000
348.63
-1.37
0111 1111
1111 1111
345.88
-4.12
0111 1110
1111 1110
2.75
-347.25
0000 0001
1000 0001
0
-350
0000 0000
1000 0000
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| FMS9884AKAC175 | 功能描述:視頻模擬/數(shù)字化轉(zhuǎn)換器集成電路 MQFP 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 |
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