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ADV7125 Folha de dados(PDF) 7 Page - Analog Devices

Nome de Peças ADV7125
Descrição Electrónicos  CMOS, 330 MHz Triple 8-Bit High Speed Video DAC
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Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
Logo AD - Analog Devices

ADV7125 Folha de dados(HTML) 7 Page - Analog Devices

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REV. 0
ADV7125
–7–
PIN FUNCTION DESCRIPTIONS
Pin Number
Mnemonic
Function
1, 2, 14, 15, 25,
GND
Ground. All GND pins must be connected.
26, 39, 40
3–10,
G0–G7,
Red, Green, and Blue Pixel Data Inputs (TTL Compatible). Pixel data is latched on the rising edge
16–23,
B0–B7,
of CLOCK. R0, G0, and B0 are the least significant data bits. Unused pixel data inputs should
41–48
R0–R7
be connected to either the regular PCB power or ground plane.
11
BLANK
Composite Blank Control Input (TTL Compatible). A logic zero on this control input drives the
analog outputs, IOR, IOB, and IOG, to the blanking level. The
BLANK signal is latched on the
rising edge of CLOCK. While
BLANK is a logical zero, the R0–R7, G0–G7, and B0–B7 pixel
inputs are ignored.
12
SYNC
Composite Sync Control Input (TTL Compatible). A logical zero on the
SYNC input switches
off a 40 IRE current source. This is internally connected to the IOG analog output.
SYNC does
not override any other control or data input; therefore, it should only be asserted during the
blanking interval.
SYNC is latched on the rising edge of CLOCK. If sync information is not
required on the green channel, the
SYNC input should be tied to logical zero.
13, 29, 30
VAA
Analog Power Supply (5 V
± 5%). All VAA pins on the ADV7125 must be connected.
24
CLOCK
Clock Input (TTL Compatible). The rising edge of CLOCK latches the R0–R7, G0–G7, B0–B7,
SYNC, and BLANK pixel and control inputs. It is typically the pixel clock rate of the video
system. CLOCK should be driven by a dedicated TTL buffer.
27, 31, 33
IOR, IOG, IOB Differential Red, Green, and Blue Current Outputs (High Impedance Current Sources). These
RGB video outputs are specified to directly drive RS-343A and RS-170 video levels into a doubly
terminated 75
Ω load. If the complementary outputs are not required, these outputs should be
tied to ground.
28, 32, 34
IOR, IOG, IOB
Red, Green, and Blue Current Outputs. These high impedance current sources are capable of
directly driving a doubly terminated 75
Ω coaxial cable. All three current outputs should have
similar output loads whether or not they are all being used.
35
COMP
Compensation Pin. This is a compensation pin for the internal reference amplifier. A 0.1
µF
ceramic capacitor must be connected between COMP and VAA.
36
VREF
Voltage Reference Input for DACs or Voltage Reference Output (1.235 V)
37
RSET
A resistor (RSET) connected between this pin and GND controls the magnitude of the full-scale
video signal. Note that the IRE relationships are maintained, regardless of the full-scale output
current. The relationship between RSET and the full-scale output current on IOG (assuming ISYNC
is connected to IOG) is given by:
RV
V
IOG mA
SET
REF
()
()
( )
11 445
,/
The relationship between RSET and the full-scale output current on IOR, IOG, and IOB is given by:
The equation for IOG will be the same as that for IOR and IOB when
SYNC is not being used,
i.e.,
SYNC tied permanently low.
38
PSAVE
Power Save Control Pin. Reduced power consumption is available on the ADV7125 when this
pin is active.
IOG mA
V
V
R
SYNC being asserted
REF
SET
()
()
( )(
)
11 444 8
,.
/
IOR IOB mA
V
V
R
REF
SET
,,
.
/
()
()
( )
7 989 6


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