VDP3108 datasheet(18/61 Pages) MICRONAS

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VDP 3108

ADVANCE INFORMATION

MICRONAS INTERMETALL

10 bit

DAC

Video

3.8 mA

blank &

timing

8 bit

ADC

measurm.

9 bit

U/I–DAC

3.8 mA

clamp

key

analog

R in

Sense

analog

R out

analog

G out

analog

B out

analog

G in

analog

B in

digital

R in

measurem.

9 bit

DAC

1.5 mA

digital

G in

digital

B in

9 bit

DAC

2.2 mA

blanking

750 uA

10 bit

DAC

Video

3.8 mA

10 bit

DAC

Video

3.8 mA

9 bit

U/I–DAC

3.8 mA

clamp

9 bit

U/I–DAC

3.8 mA

clamp

9 bit

DAC

2.2 mA

blanking

750 uA

9 bit

DAC

2.2 mA

blanking

750 uA

9 bit

DAC

1.5 mA

9 bit

DAC

1.5 mA

Input

I/O

Fig. 2–22: Analog back end

9 bit

DAC

1.5 mA

9 bit

DAC

1.5 mA

9 bit

DAC

1.5 mA

fast

blank in

white drive R

white drive G

white drive B

int . brightness

ext. contrast

ext. brightness

FP Interface

2.5.1. CRT Measurement and Control

The display processor is equipped with an 8 bit PDM-

ADC for all measuring purposes. The ADC is connected

to the Sense input pin, the input range is 0...1.5V. The

bandwidth of the PDM filter can be selected; the mea-

surement window is 19/9.5

µs for small/large bandwidth

setting. The input impedance is more than 1 M

Ω.

Cutoff and white drive current measurement is carried

out during the vertical blanking interval. It is always using

the small bandwidth setting. The current range for the

cutoff measurement is set by connecting a sense resis-

tor to then MADC input. For the whitedrive measure-

ment, the range is set by using a sense resistor and the

range select switch 2 output pin. During the active pic-

ture the minimum and maximum beam current is mea-

sured. The measurement range can be set by using the

range select switch pin. The timing window of this mea-

surement is programmable. The intention is to automati-

cally detect letterbox transmission or to measure the ac-

tual beam current. All control loops are closed via the

external control microprocessor.

In each field two sets of measurements can be taken:

a) The picture tube measurement returns results for

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