HMP8156ACNZ Intersil, HMP8156ACNZ Datasheet - Page 16

• Manufacturer Part Number: HMP8156ACNZ
• Description: IC VIDEO ENCODER NTSC/PAL 64MQFP
• Manufacturer: Intersil
• Type: NTSC/PAL Encoderr

Specifications of HMP8156ACNZ

• Applications: Multimedia, Video Editing
• Voltage - Supply, Analog: 4.75 V ~ 5.25 V
• Voltage - Supply, Digital: 4.75 V ~ 5.25 V
• Mounting Type: Surface Mount
• Package / Case: 64-MQFP, 64-PQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Analog Outputs
The HMP8154/HMP8156A converts the video data into
analog signals using four 10-bit DACs running at the CLK2
rate. The DACs output a current proportional to the digital
data. The full scale output current is determined by the
reference voltage VREF and an external resistor RSET. The
full scale output current is given by:
I
VREF must be chosen such that it is within the part’s
operating range; RSET must be chosen such that the
maximum output current is not exceeded.
If the VREF pin is not connected, the HMP8154/HMP8156A
provides an internal reference voltage. Otherwise, the
applied voltage overdrives the internal reference. If an
external reference is used, it must decoupled from any
power supply noise. An example external reference circuit is
shown in the Applications section.
The HMP8154/HMP8156A generates 1V
signals across 37.5Ω loads corresponding to doubly
terminated 75Ω lines. The encoder may also drive larger
loads. The full scale output current and load must be chosen
such that the maximum output voltage is not exceeded.
Output DAC Filtering
Since the DACs run at 2X the pixel sample rate, the sin(x)/x
rolloff of the outputs is greatly reduced, and there are fewer
high frequency artifacts in the output spectrum. This allows
using simple analog output filters. The analog output filter
should be flat to F
Example filters are shown in the Applications section.
Composite + Y/C Output Mode
The HMP8154/HMP8156A provides three output modes:
S-video, RGB, and power down. When S-video outputs are
selected, the encoder outputs the luminance, modulated
chrominance, and two copies of the composite video signals.
All four outputs are time aligned.
Composite + RGB Output Mode
When analog RGB video is selected, the
HMP8154/HMP8156A transforms the filtered 8:8:8 YCbCr
FULLSCALE
ENABLE BITS
CAPTIONING
CLOSED
00
01
10
11
(mA) = 3.9 * VREF (V)/RSET (kΩ)
s
/4 and have good rejection at 3F
None
21 (NTSC)
18 (M PAL)
22 (Other PAL)
284 (NTSC)
281 (M PAL)
335 (Other PAL)
21, 284 (NTSC)
18, 281 (M PAL)
22, 335 (Other PAL)
OUTPUT LINE(S)
16
P-P
nominal video
TABLE 8. CLOSED CAPTIONING MODES
HMP8154, HMP8156A
s
/4.
(EQ 1.)
Caption Data
Caption Data
Ignored
Ignored
284A
284B
CAPTIONING REGISTER
data into 8:8:8 RGB data. The transform matrix uses
different coefficients to generate NTSC or PAL video levels.
The analog RGB outputs have a range of 0.3-1.0V with an
optional blanking pedestal. Composite sync information (0.0-
0.3V) may be optionally added to the green output. Closed
captioning data is not included on the RGB outputs. The
HMP8154/HMP8156A also generates composite video
when in RGB output mode. All four outputs are time aligned.
The HMP8154/HMP8156A provides selectable pin outs for
the RGB outputs. When the SCART compatibility bit is
cleared, the analog composite video is output onto the
NTSC/PAL 1 pin. Red information is output onto the
NTSC/PAL 2 pin, blue information is output onto the C pin,
and green information is output onto the Y pin.
When the bit is set, the analog composite video is output
onto the Y pin. Red information is output onto the C pin, blue
video is output on the NTSC/PAL 2 pin, and the green signal
is output on the NTSC/PAL 1 pin. The output pin
assignments are summarized in Table 9.
Power Down Modes
To reduce power dissipation, any of the four output DACs
may be turned off. Each DAC has an independent enable bit.
Each output may be disabled in the host control register.
When the power down mode is enabled, all of the DACs and
internal voltage reference are powered down (forcing their
outputs to zero) and the data pipeline registers are disabled.
NTSC/PAL 1
NTSC/PAL 2
PIN NAME
Caption Data
Caption Data
Y
C
Ignored
Ignored
21A
21B
TABLE 9. OUTPUT PIN ASSIGNMENTS
PIN
11
15
#
3
7
COMP. WITH
Composite
Composite
Chroma
Luma
0 = Loaded
0 = Loaded
Y/C
1 = Output
1 = Output
(X)
Always 1
Always 1
284
(SCART SELECT BIT)
WRITE STATUS BIT
OUTPUT MODE
Composite
COMP. W/
Green
RGB
Blue
Red
(0)
0 = Loaded
0 = Loaded
1 = Output
1 = Output
Always 1
Always 1
August 20, 2009
Composite
COMP. W/
21
Green
RGB
Blue
Red
(1)
FN4343.5