BT856 View Datasheet(PDF) - Unspecified

Part Name

Description

Manufacturer

BT856

YCrCb or RGB to NTSC/PAL Digital Video Encoder

Unspecified 

CIRCUIT DESCRIPTION

Outputs

Figure 11. 525-Line (NTSC/PAL–M) C (Chrominance) Video Output Waveform

MA

V

28.21 1.058

Bt856/7

20.88 0.783

17.07 0.640

13.27 0.498

20 IRE

20 IRE

Color Burst

(9 Cycles)

BLANK

LEVEL

5.93 0.222

Note: Typical with 37.5 Ω load, VREF_IN = VREF_OUT, Nominal RSET, Chroma on, and setup on. SMPTE

170 M levels are assumed. 100% saturation color bars (100/7.5/100/7.5) are shown.

Table 4. 525-Line (NTSC/PAL–M) C (Chrominance) Video Output Truth Table

Description

Iout (mA)

DAC Data

Sync Interval

BLANK*

Peak Chroma (High)

28.21

423

x

1

Burst (High)

20.88

313

x

x

Blank

17.07

256

x

0

Burst (Low)

13.27

199

x

x

Peak Chroma (Low)

5.93

89

x

1

Note: Typical with 37.5 Ω load, VREF_IN = VREF_OUT, Nominal RSET, Chroma on, and setup on. SMPTE 170 M

levels are assumed. 100% saturation color bars (100/7.5/100/7.5) are shown.

24

Brooktree®

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