參數(shù)資料
型號(hào)： TPU3035PO
元件分類： 圖文
英文描述： TELETEXT DECODER, PDIP52
封裝： PLASTIC, DIP-52
文件頁(yè)數(shù)： 5/72頁(yè)
文件大?。?/td> 347K
代理商： TPU3035PO
TPU 3035, TPU 3040, TPU 3050
PRELIMINARY DATA SHEET
13
Micronas
3.3. Pin Descriptions
Pin 1 – VRT Reference Voltage Top (Fig. 3–7)
This pin is connected to the internally-stabilized refer-
ence voltage of the A/D converter which is derived from
the VASUP supply. Pin 1 must be decoupled externally to
prevent high and low frequency noise.
Pin 2 – TEST Test Input (Fig. 3–8)
This pin is used for switching the TPU 3040 into test
mode. For normal operation this pin has to be connected
to ground.
Pin 3 – DATA DRAM Data Input/Output (Fig. 3–9)
This pin serves as an output for writing data into the ex-
ternal DRAM and as an input for reading data from the
external DRAM.
Pin 4 – WE DRAM Write Enable Output (Fig. 3–9)
This pin supplies the Write Enable signal to the external
DRAM.
Pin 5 – RAS DRAM Row Address Strobe Output
(Fig. 3–9)
This pin supplies the Row Address Strobe signal to the
external DRAM.
Pin 6 – CAS DRAM Column Address Strobe Output
(Fig. 3–9)
This pin supplies the Column Address Strobe signal to
the external DRAM.
Pins 7 to 18 – A0 to A11 DRAM Address Outputs
(Figs. 3–9 and 3–10)
These pins are used for addressing the external DRAM.
The addressing is compatible to all DRAM sizes from
64K to 16M, therefore the correct connection of pins A8
to A11 to the corresponding DRAM pins is necessary.
Pins 19 and 20 – SCL and SDA IIC Bus (Fig. 3–11)
Via these pins, the TPU 3040 communicates with exter-
nal devices.
Pin 21 – IR Infrared (Fig. 3–12)
This pin has to be connected to ground.
Pin 22 – MAC_PAK MAC Paket Data (Fig. 3–12)
Via this pin, the TPU 3040 receives MAC packets from
the DMA 2381 or from the DMA 2386.
Pin 23 – MAC_VBI MAC VBI Data (Fig. 3–12)
By means of this input, the TPU 3040 receives MAC VBI
data from the DMA 2381 or from the DMA 2386.
Pin 24 – MAC_SYNC MAC Synchronization (Fig. 3–12)
By means of this input, the TPU 3040 receives the re-
quired MAC synchronization pulse from the DMA 2381.
This sync pulse is used both as line sync and frame sync
for the MAC teletext acquisition.
Pin 25 – HSYNC Horizontal Synchronization (Fig. 3–9)
Via this input, the TPU 3040 receives the horizontal syn-
chronization signal. Either the falling or the rising edge
of this signal will start the internal horizontal timing gen-
eration.
Pin 26 – VSYNC Vertical Synchronization (Fig. 3–9)
Via this input, the TPU 3040 receives the vertical syn-
chronization signal. Either the falling or the rising edge
of this signal will start the internal vertical timing genera-
tion.
Pin 27 and 28 – XTAL1 and XTAL2 (Fig. 3–13)
These oscillator pins are used to connect a 20.25MHz
crystal, which determines the internal clock signal. Alter-
natively, an 20.25MHz clock signal may be fed to pin 28.
Pin 29 – RESET Reset Input/Output (Fig. 3–11)
This pin is used for hardware reset. The TPU 3040
watchdog generates a reset pulse which can be used to
reset external circuits.
Pin 30 – FBIN Fast Blanking Input (Fig. 3–14)
This pin serves for enabling the analog RGB inputs.
Pin 31 to 33 – RIN, GIN, BIN RGB Inputs (Fig. 3–15)
Via these inputs, the TPU 3040 receives analog RBG
signals, e.g. OSD or video recorder (SCART), which are
fed to the analog RBG outputs. The specified level of
these signals is 0 V to 0.7 V. For other DC levels, an AC
coupling has to be used and the internal clamping circuit
will adjust the DC level.
Pin 34 – DVSUP Digital Supply Voltage
This pin supplies all digital stages and has to be con-
nected with the positive supply voltage.
Pin 35 – DGND Digital Ground
This pin is the common ground connection of all digital
stages and has to be connected with the ground of the
power supply.
Pin 36 – FBOUT Fast Blanking Output (Fig. 3–10)
This output supplies a fast switching signal, indicating
the presence of RBG output signals.
Pin 37 to 39 – ROUT, GOUT, BOUT RGB Outputs
(Fig. 3–15)
These outputs either supply the analog RGB signals,
which have been received via the analog RGB input pins
31 to 33, or the internally generated RGB signals.
Pin 40 – AGND Analog Ground
This pin is the common ground connection of all analog
stages and has to be connected with the ground of the
power supply.
Pin 41 – AVSUP Analog Supply Voltage
This pin supplies all analog stages and has to be con-
nected with the positive supply voltage.
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