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參數(shù)資料
| 型號： | IBM37RGB524CF17A |
| 元件分類： | 顯示控制器 |
| 英文描述： | 1600 X 1280 PIXELS PALETTE-DAC DSPL CTLR, PQFP144 |
| 封裝： | QFP-144 |
| 文件頁數(shù)： | 55/72頁 |
| 文件大?。?/td> | 509K |
| 代理商： | IBM37RGB524CF17A |
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March 17, 1995
53
IBM
RGB524
DAC Support
VREFIN
C
18
Voltage Reference In for the DACs. Connect 1.235 V to this pin and decouple
it with a 10 nF ceramic capacitor to DACGND.
RREF
C
26
Resistor Reference. Connect a resistor from this pin to DACGND. This pin
connects to an internal op amp which compares the voltage on this pin to
that of VREFIN, and adjusts the current owing out of the RREF pin such
that the voltage developed across the reference resistor matches VREFIN.
The value of the resistor determines the full scale output current of the
DACs. A value of 698
is recommended.
CVREF
C
15
Comparator Voltage Reference. An internal voltage divider between
VREFIN and DACGND sets this pin to 0.35V. It is used internally by
comparators to sense the values of the DAC outputs. Decouple this pin to
DACGND with a 1nF ceramic capacitor.
GREF
C
14
DAC Gate Reference. Output of DAC op amp and input to gates of devices
connecting DACVDD to the DAC current switches. Decouple this pin to
DACVDD with a 1 nF ceramic capacitor.
PLL Support
RCI0
C
92
Pixel PLL Loop lter. Connect to parallel 1.3 K
resistor and 680 pF
capacitor.
Return parallel resistor and capacitor to RCRET0 through 8.2 nF capacitor.
RCRET0
C
91
Pixel PLL Loop lter return. Connect as described above under RCI0.
RCI1
C
87
SYSCLK PLL Loop lter. Connect to parallel 1.3 K
resistor and 680 pF
capacitor.
Return parallel resistor and capacitor to RCRET1 through 8.2 nF capacitor.
RCRET1
C
86
SYSCLK PLL Loop lter return. Connect as described above under RCI1.
Table 10. Pin Descriptions (Continued)
Signal
Typ
e
Pin(s)
Description
Type: I = Input, O = Output, B = Bidirectional, C = Component
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