參數(shù)資料
型號(hào)： TMC2491AR2C
廠商： FAIRCHILD SEMICONDUCTOR CORP
元件分類(lèi)： 顏色信號(hào)轉(zhuǎn)換
英文描述： COLOR SIGNAL ENCODER, PQCC44
封裝： PLASTIC, LCC-44
文件頁(yè)數(shù)： 31/36頁(yè)
文件大?。?/td> 208K
代理商： TMC2491AR2C
TMC2490A/TMC2491A
PRODUCT SPECIFICATION
4
SDA, R/W
6
R-Bus/TTL
Serial Data/Read/Write Control. When SER is LOW, SDA is the
data line of the serial interface. When SER is HIGH, the pin is the
read/write control for the parallel interface. When R/W and CS are
LOW, the microprocessor can write to the control registers over
D7-0. When R/W is HIGH and CS is LOW, it can read the
contents of any selected control register over D7-0.
SCL, CS
7
R-Bus/TTL
Serial Clock/Chip Select. When SER is LOW, SCL is the clock
line of the serial interface. When SER is HIGH, the pin is the chip
select control for the parallel interface. When CS is HIGH, the
microprocessor interface port, D7-0, is set to HIGH impedance
and ignored. When CS is LOW, the microprocessor can read or
write parameters over D7-0.
SER
8
TTL
Serial/Parallel Port Select. When LOW, the 2-line serial
interface is activated. Pins 5, 6, and 7 function as SA0, SDA, and
SCL respectively. When HIGH, the parallel interface port is active
and pins 5, 6, and 7 function as ADR, R/W, and CS respectively.
Outputs
CHROMA
35
1.35V p-p
Chrominance-only Video. Analog output of chrominance D/A
converter. Maximum output is 1.35 volts peak-to-peak into a
doubly terminated 75 Ohm load.
COMPOSITE
30
1.35V p-p
Composite NTSC/PAL Video. Analog output of composite D/A
converter. Maximum output is 1.35 volts peak-to-peak into a
doubly terminated 75 Ohm load.
LUMA
32
1.35V p-p
Luminance-only Video. Analog output of luminance D/A
converter. Maximum output is 1.35 volts peak-to-peak into a
doubly terminated 75 Ohm load.
Analog Interface
CBYP
33
0.1
F
Reference Bypass Capacitor. Connection point for 0.1
F
decoupling capacitor to VDD at pin 34.
RREF
28
787
Current-setting Resistor. Connection point for external current-
setting resistor for D/A converters. The resistor is connected
between RREF and GND. Output video levels are inversely
proportional to the value of RREF.
VREF
27
+1.235V
Voltage Reference Input. External voltage reference input,
internal voltage reference output, nominally 1.235 V.
SYNC Out
HSYNC
18
TTL
Horizontal Sync Output.
VSYNC, T/B
19
TTL
Vertical Sync Output or Odd/Even Field ID Output.
CBSEL, PDC
20
TTL
Pixel Data Phase Output or Video Blanking Output.
SELC
21
TTL
Luma/Chroma MUX Control.
Power Supply
VDD
1, 23, 26, 37
+5V
Power Supply. Positive power supply.
GND
2, 13, 24, 29,
31, 36
0.0V
Ground.
VDDA
34
+5V
Analog Power Supply. Positive power supply.
Pin Descriptions (continued)
Pin Name
Pin Number
Value
Pin Function Description
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