hmp8156a Intersil Corporation, hmp8156a Datasheet - Page 25

• Manufacturer Part Number: hmp8156a
• Description: Ntsc/pal Video Encoder
• Manufacturer: Intersil Corporation

Pin Descriptions
NTSC/PAL 1
NTSC/PAL 2
FS_ADJUST
COMP 1
COMP 2
RESET
NAME
VREF
CLK2
GND
CLK
SCL
SDA
VAA
PIN
(G)
(R)
SA
(B)
Y
C
NUMBER
PIN
39
41
18
19
20
25
11
15
61
62
64
63
3
7
(Continued)
25
OUTPUT
INPUT/
I/O
I/O
I/O
O
O
O
O
I
I
I
I
1X pixel clock input/output. As an input, this clock must be free-running and synchronous
to the clock signal on the CLK2 pin. As an output, this pin may drive a maximum of one LS
TTL load. CLK is generated by dividing CLK2 by two or four, depending on the mode. If
not driven, the circuit for this pin should include a 4-12kΩ pull up resistor connected to
VAA.
2X pixel clock input. This clock must be a continuous, free-running clock.
I
up resistor connected to VAA.
I
I
connected to VAA.
Reset control input. A logical zero for a minimum of four CLK cycles resets the device.
RESET must be a logical one for normal operation.
Luminance analog current output. This output contains luminance video, sync, blanking,
and closed captioning information. In analog RGB output mode, green or composite ana-
log video is generated. It is capable of driving a 37.5Ω load. If not used, it should be con-
nected to GND.
Chrominance analog current output. This output contains chrominance video, and blanking
information. In analog RGB output mode, blue or red analog video is generated. It is capable
of driving a 37.5Ω load. If not used, it should be connected to GND.
Composite video analog current output. This output contains composite video, sync, blank-
ing, and closed captioning information. In analog RGB output mode, composite or green an-
alog video is generated. It is capable of driving a 37.5Ω load. If not used, it should be
connected to GND.
Composite video analog current output. This output contains composite video, sync, blank-
ing, and closed captioning information. In analog RGB output mode, red or blue analog video
is generated. It is capable of driving a 37.5Ω load. If not used, it should be connected to GND.
Voltage reference. An optional external 1.235V reference may be used to drive this pin. If left
floating, the internal voltage reference is used.
Full scale adjust control. A resistor (RSET) connected between this pin and GND sets the
full-scale output current of each of the DACs.
Compensation pin. A 0.1µF ceramic chip capacitor should be connected between this pin
and VAA, as close to the device as possible.
Compensation pin. Connection to this pin is optional. A 0.1µF ceramic chip capacitor may
be connected between this pin and VAA. If used, the capacitor should be placed as close to
the device as possible.
+5V power. A 0.1µF ceramic capacitor, in parallel with a 0.01µF chip capacitor, should be
used between each group of VAA pins and GND. These should be as close to the device as
possible.
Ground
2
2
2
HMP8154, HMP8156A
C interface clock input. The circuit for this pin should include a 4-6kΩ pull
C interface address select input.
C interface data input/output. The circuit for this pin should include a 4-6kΩ pull-up resistor
DESCRIPTION
November 4, 2005
4343.4