ADV7195 datasheet(10/36 Pages) AD

Il numero della parte	ADV7195

Spiegazioni elettronici	Multiformat Progressive Scan/HDTV Encoder with Three 11-Bit DACs and 10-Bit Data Input

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REV. A

ADV7195

–10–

FUNCTIONAL DESCRIPTION

Digital Inputs

The digital inputs of the ADV7195 are TTL-compatible. 30-bit

YCrCb or RGB pixel data in 4:4:4 format or 20-bit YCrCb

pixel data in 4:2:2 format is latched into the device on the rising

edge of each clock cycle at 27 MHz in Progressive Scan Mode or

74.25 MHz or 74.1785 MHz in HDTV mode. It is also possible

to input 3

× bit RGB data in 4:4:4 format to the ADV7195. It

is recommended to input data in 4:2:2 mode to make use of the

chroma SSAFs on the ADV7195. As can be seen in Figures 6 and

7, this filter has 0 dB passband response and prevents signal com-

ponents being loaded back into the frequency band. In 4:4:4 input

mode, the video data is already interpolated by the external

input device and the chroma SSAFs of the ADV7195 are bypassed.

RBW 10kHz

VBW 300Hz

SWP 17.0SEC

START 100kHz

STOP

20.00MHz

RL –10.0dBm

10dB/

3.18MHz

ATTEN

10dB

VAVG

1

MKR

0dB

Figure 6. ADV7195 SSAF Response to a 2.5 MHz Chroma

Sweep Using 4:2:2 Input Mode

RBW 10kHz

VBW

300Hz

SWP

17.0SEC

START

100kHz

STOP

20.00MHz

RL –10.0dBm

10dB/

3.12MHz

ATTEN

10dB

VAVG

4

MKR

–3.00dB

Figure 7. Conventional Filter Response to a 2.5 MHz

Chroma Sweep Using 4:4:4 Input Mode

Control Signals

The ADV7195 accepts sync control signals accompanied by

valid 4:2:2 or 4:4:4 data. These external horizontal, vertical, and

blanking pulses (or EAV/SAV codes) control the insertion of

appropriate sync information into the output signals.

Analog Outputs

The analog Y signal is output on the 11-bit + Sync DAC A,

the color component analog signals on the 11-bit DAC B and

DAC C conforming to EIA-770.1 or EIA-770.2 standards in PS

mode or EIA-770.3 in HDTV mode. RSET has a value of 2470

Ω

(EIA-770.1, EIA-770.2, EIA-770.3), RLOAD has a value of 300

Ω.

For RGB outputs conforming to RS-170/RS-343A output stan-

dards RSET must have a value of 2820

Ω.

Undershoot Limiter

A limiter can be applied to the Y data before it is applied to the

DACs. Available limit values are –1.5 IRE, –6 IRE, –11 IRE below

blanking. This functionality is available in Progressive Scan

Mode only.

I

2C Filter

A selectable internal I

2C filter allows significant noise reductions

on the I

2C interface. In setting ALSB high, the input bandwidth

on the I

2C lines is reduced and pulses of less than 50 ns are not

passed to the I

2C controller. Setting ALSB low allows greater

input bandwidth on the I

2C lines.

Internal Test Pattern Generator

The ADV7195 can generate a crosshatch pattern (white lines

against a black background). Additionally, the ADV7195 can

output a uniform color pattern. The color of the lines or uni-

form field/frame can be programmed by the user.

Y/CrCb Delay

The Y output and the color component outputs can be delayed

wrt the falling edge of the horizontal sync signal by up to four

clock cycles.

Gamma Correction

Gamma correction may be performed on the luma data. The

user has the choice to use either of two different gamma curves,

A or B. At any one time one of these curves is operational if

gamma correction is enabled. Gamma correction allows the

mapping of the luma data to a user-defined function.

54 MHz Operation

In Progressive Scan mode, it is possible to operate the three

output DACs at 54 MHz or 27 MHz. The ADV7195 is sup-

plied with a 27 MHz clock synced with the incoming data. If

required, a second stage interpolation filter interpolates the data

to 54 MHz before it is applied to the three output DACs.

The second stage interpolation filter is controlled by MR36. After

applying a Reset, it is recommended to toggle this bit. Before

toggling this bit, 3Ehex must be written to Address 09hex.

PROGRAMMABLE SHARPNESS FILTER

Sharpness Filter Mode is applicable to the Y data only in

Progressive Scan Mode.

The desired frequency response can be chosen by the user in

programming the correct value via the I

2C. The variation of

frequency responses can be seen in the figures on the follow-

ing pages.

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