AD7183 datasheet(10/40 Pages) AD

No de pièce	AD7183

Description	Advanced Video Decoder with 10-Bit ADC and Component Input Support

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Fabricant	AD [Analog Devices]

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REV. 0

–10–

ADV7183

In S-video mode there are two clamp controllers used to sepa-

rately control the luminance clamping and the chrominance

clamping. Also in YCrCb component input mode there are two

clamp controllers used to control the luminance clamping and

the CrCb clamping separately; there are, however, individual

current clamps on the Cr and Cb inputs.

User programmability is built into the clamp controllers which

enable the current and digital clamp controllers to be set up to

user-defined conditions. Refer to analog clamp control register

(14H), digital clamp control register (15H), and digital color

clamp offset register (15H and 16H) for control settings.

ANALOG-TO-DIGITAL CONVERTERS

Two 10-bit ADCs are used in the ADV7183, and they run from

a 27 MHz input clock. An integrated band gap generates the

required reference voltages for the converters. If the decoder is

configured in CVBS mode, the second ADC can be switched off

to reduce power consumption, see PSC[1:0].

AUTOMATIC GAIN CONTROL

The AGC control block on the ADV7183 is a digitally based

system. This controller ensures that the input video signal

(CVBS, S-video, or YCrCb) is scaled to its correct value such

that the YCrCb digital output data matches the correct gain of

the video signal. The AGC has an analog input video range of

0.5 V p-p to 2.0 V p-p, which gives a –6 dB to +6 dB gain range.

Figure 6 demonstrates this range. This AGC range will compensate

for video signals that have been incorrectly terminated or have

been attenuated due to cable loss or other factors.

There are two main control blocks: one for the luminance chan-

nel and one for the chrominance channel.

The luminance automatic gain control has eight modes of

operation:

1. Manual AGC mode where gain for the luminance path is set

manually using LGM[11:0].

2. Blank level to sync tip is used to set the luminance gain;

manual MIRE[2:0] controls the maximum value through the

luminance channel. There is no override of this mode when

white peak mode is detected.

3. Blank level to sync tip is used to set luminance gain; manual

MIRE[2:0] controls the maximum value through luminance

channel. There is override of this mode when white peak

mode is detected. White peak mode is activated when the

input video exceeds the maximum luminance range for long

periods; this mode is designed to prevent clipping of the

input video signal.

4. Blank level to sync tip is used to set luminance gain;

MIRE[2:0] is automatically controlled to set the maximum

value through the luminance channel. There is no override

of this mode when white peak mode is detected.

5. Blank level to sync tip is used to set luminance gain; manual

MIRE[2:0] is automatically controlled to set the maximum

value through the luminance channel. There is override of

this mode when white peak mode is detected. White peak

mode is activated when the input video exceeds the maxi-

mum luminance range for long periods; this mode is designed

to prevent clipping of the input video signal.

6. Based on active video peak white. PW_UPD sets the gain

update frequency (once per field).

7. Based on average active video. PW_RES sets what lines are used;

only relevant if the signal conforms to PAL 625 line standard.

8. The luminance channel gain is frozen at its present value.

6

0

–6

0

RANGE = 12dB

MAXIMUM

MINIMUM

Figure 6. Analog Input Range

The chrominance automatic gain control has four modes of

operation:

1. Manual AGC mode where gain for chrominance path is set

manually using CGM[11:0].

2. Luminance gain used for chrominance channel.

3. Chrominance automatic gain based on color burst amplitude.

4. Chrominance gain frozen at its present setting.

Both the luminance and chrominance AGC controllers have a

programmable time constant that allows the AGC to operate in

four modes: slow, medium, fast, and video quality controlled.

The maximum IRE (MIRE[2:0]) control can be used to set the

maximum input video range that can be decoded. Table I shows

the selectable range.

Table I. MIRE Control

Function

MIRE[2:0]

PAL (IRE)

NTSC (IRE)

0

133

122

0

1

125

115

0

1

0

120

110

0

1

115

105

1

0

110

100

1

0

1

105

100

1

0

100

1

100

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