ADV7176AKSZ Analog Devices Inc, ADV7176AKSZ Datasheet - Page 11

• Manufacturer Part Number: ADV7176AKSZ
• Manufacturer: Analog Devices Inc

Specifications of ADV7176AKSZ

• Adc/dac Resolution: 10b
• Screening Level: Commercial
• Package Type: MQFP
• Pin Count: 44
• Lead Free Status / RoHS Status: Compliant

(Continued from page 1)
compatible with worldwide standards. The 4:2:2 YUV video
data is interpolated to two times the pixel rate. The color-
difference components (UV) are quadrature modulated using
a subcarrier frequency generated by an on-chip 32-bit digital
synthesizer (also running at two times the pixel rate). The two
times pixel rate sampling allows for better signal-to-noise-ratio.
A 32-bit DDS with a 10-bit look-up table produces a superior
subcarrier in terms of both frequency and phase. In addition to
the composite output signal, there is the facility to output S-
Video (Y/C) video, YUV or RGB video. The Y/C, YUV or RGB
format is simultaneously available at the analog outputs with the
composite video signal.
Each analog output is capable of driving the full video-level
(35 mA) signal into an unbuffered, doubly terminated 75 Ω
load. With external buffering, the user has the additional option
to scale back the DAC output current to 5 mA min, thereby signifi-
cantly reducing the power dissipation of the device.
The ADV7175A/ADV7176A also supports both PAL and NTSC
square pixel operation.
The output video frames are synchronized with the incoming
data timing reference codes. Optionally the encoder accepts
(and can generate) HSYNC, VSYNC and FIELD timing signals.
These timing signals can be adjusted to change pulsewidth and
position while the part is in the master mode. The encoder
requires a single two times pixel rate (27 MHz) clock for standard
operation. Alternatively, the encoder requires a 24.5454 MHz
clock for NTSC or 29.5 MHz clock for PAL square pixel
mode operation. All internal timing is generated on-chip.
A separate teletext port enables the user to directly input teletext
data during the vertical blanking interval.
The ADV7175A/ADV7176A modes are set up over a two-wire
serial bidirectional port (I
Functionally the ADV7175A and ADV7176A are the same with
the exception that the ADV7175A can output the Macrovision
anticopy algorithm.
The ADV7175A/ADV7176A is packaged in a 44-lead thermally
enhanced MQFP package.
NTSC
PAL
FILTER SELECTION
NTSC
PAL
NTSC
PAL
NTSC/PAL
NTSC
PAL
FILTER SELECTION
2
C Compatible) with two slave addresses.
MR04
0
0
0
0
1
1
1
MR03
CUTOFF (MHz)
0
0
1
1
0
1
1
PASSBAND
1.0
1.3
CUTOFF (MHz)
PASSBAND
2.3
3.4
1.0
1.4
4.0
2.3
3.4
RIPPLE (dB)
PASSBAND
0.085
0.04
RIPPLE (dB)
PASSBAND
0.026
0.098
0.085
0.107
0.150
0.054
0.106
CUTOFF (MHz)
STOPBAND
DATA PATH DESCRIPTION
For PAL B, D, G, H, I, M, N and NTSC M modes, YCrCb
4:2:2 data is input via the CCIR-656 compatible pixel port at a
27 MHz Data Rate. The pixel data is demultiplexed to from
three data paths. Y typically has a range of 16 to 235, Cr and
Cb typically have a range of 128 ± 112; however, it is pos-
sible to input data from 1 to 254 on both Y, Cb and Cr. The
ADV7175A/ADV7176A supports PAL (B, D, G, H, I, N, M)
and NTSC (with and without Pedestal) standards. The appropri-
ate SYNC, BLANK and Burst levels are added to the YCrCb
data. Macrovision antitaping (ADV7175A only), closed caption-
ing and teletext levels are also added to Y, and the resultant
data is interpolated to a rate of 27 MHz. The interpolated data
is filtered and scaled by three digital FIR filters.
The U and V signals are modulated by the appropriate subcarrier
sine/cosine phases and added together to make up the chromi-
nance signal. The luma (Y) signal can be delayed 1–3 luma
cycles (each cycle is 74 ns) with respect to the chroma signal.
The luma and chroma signals are then added together to make
up the composite video signal. All edges are slew rate limited.
The YCrCb data is also used to generate RGB data with
appropriate SYNC and BLANK levels. The RGB data is in
synchronization with the composite video output. Alternatively
analog YUV data can be generated instead of RGB.
The four 10-bit DACs can be used to output:
1. Composite Video + RGB Video.
2. Composite Video + YUV Video
3. Two Composite Video Signals + LUMA and CHROMA
3.
Alternatively, each DAC can be individually powered off if
not required.
Video output levels are illustrated in Appendix 4 and Appendix 5.
INTERNAL FILTER RESPONSE
The Y filter supports several different frequency responses,
including two 4.5 MHz/5.0 MHz low pass responses, PAL/
NTSC subcarrier notch responses and a PAL/NTSC extended
response. The U and V filters have a 2/2.4 MHz low-pass
response for NTSC/PAL. These filter characteristics are illus-
trated in Figures 4 to 12.
3.2
4.0
CUTOFF (MHz)
(Y/C) Signals.
STOPBAND
7.0
7.3
3.57
4.43
7.5
7.0
7.3
ATTENUATION (dB)
STOPBAND
>
>
ATTENUATION (dB)
40
40
STOPBAND
>
>
>
>
>
>
>
ADV7175A/ADV7176A
54
50
27.6
29.3
40
54
50.3
ATTENUATION @
1.3MHz (dB)
0.3
0.02
F
4.2
5.0
2.1
2.7
5.65
4.2
5.0
3dB
F
2.05
2.45
3dB