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ADV7152LS135 Datasheet(PDF) 9 Page - Analog Devices

No. de pieza ADV7152LS135
Descripción Electrónicos  CMOS 220 MHz True-Color Graphics Triple 10-Bit Video RAM-DAC
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ADV7152
–9–
REV. B
Mnemonic
Function
R/W
Read/Write Control (TTL Compatible Input). This input determines whether data is
written to or read from the device’s registers and color palette RAM. R/W and CE must
be at Logic “0” to write data to the part. R/W must be at Logic “1” and CE at Logic
“0” to read from the device.
C0, C1
Command Controls (TTL Compatible Inputs). These inputs determine the type of read
or write operation being performed on the device over the databus (see Interface Truth
Table). Data on these inputs is latched on the falling edge of CE.
IOR; IOR, IOG; IOG, IOB;
Red, Green and Blue Current Outputs (High Impedance Current Sources). These RGB
IOB
video outputs are specified to directly drive RS-343A and RS-170 video levels into dou-
bly terminated 75
Ω loads.
IOR
, IOG and IOB are the complementary outputs of IOR, IOG and IOB. These out-
puts can be tied to GND if it is not required to use differential outputs.
VREF
Voltage Reference Input (Analog Input). An external 1.235 V voltage reference is re-
quired to drive this input. An AD589 (2-terminal voltage reference) or equivalent is rec-
ommended. (Note: It is not recommended to use a resistor network to generate the
voltage reference.)
RSET
Output Full-Scale Adjust Control (Analog Input). A resistor connected between this pin
and analog ground controls the absolute amplitude of the output video signal. The value
of RSET is derived from the full-scale output current on IOG according to the following
equations:
RSET (
Ω) = C1 × R
REF/IOG (mA); SYNC on GREEN
RSET (Ω) = C2 × RREF/IOG (mA); No SYNC on GREEN.
Full-Scale output currents on IOR and IOB for a particular value of RSET are given by:
IOR (mA)= C2
× R
REF(V)/RSET (Ω)
and
IOB (mA) = C2
× R
REF (V)/RSET (Ω)
where
C1 = 6,050: PEDESTAL = 7.5 IRE
where
C1 = 5,723: PEDESTAL = 0 IRE
and
where
C2 = 4,323: PEDESTAL = 7.5 IRE
where
C1 = 3,996: PEDESTAL = 0 IRE.
COMP
Compensation Pin. A 0.1
µF capacitor should be connected between this pin and V
AA.
IPLL
Phase Lock Loop Output Current (High Impedance Current Source). This output is
used to enable multiple ADV7150/ADV7152s along with ADV7151s to be synchronized
together with subpixel resolution when using an external PLL. This output is triggered
either from the falling edge of SYNC or BLANK as determined by bit CR21 of Com-
mand Register 2. When activated, it supplies a current corresponding to
IPLL (mA) = 1,728 × RREF(V)/RSET (Ω)
When not using the IPLL function, this output pin should be tied to GND.
VAA
Power Supply (+5 V
± 5%). The part contains multiple power supply pins, all should be
connected together to one common +5 V filtered analog power supply.
GND
Analog Ground. The part contains multiple ground pins, all should be connected
together to the system’s ground plane.


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