SAA7127 PHILIPS [NXP Semiconductors], SAA7127 Datasheet - Page 9

• Manufacturer Part Number: SAA7127
• Description: Digital video encoder
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
Input levels and formats
The SAA7126H; SAA7127H expects digital Y, Cb, Cr data
with levels (digital codes) in accordance with “CCIR 601” .
For C and CVBS outputs, deviating amplitudes of the
colour difference signals can be compensated by
independent gain control setting, while gain for luminance
is set to predefined values, distinguishable for 7.5 IRE
set-up or without set-up.
Table 1 “CCIR 601” signal component levels
Notes
1. Transformation:
2. Representation of R, G and B (or Cr, Y and Cb) at the output is 9 bits at 27 MHz.
Table 2 8-bit multiplexed format (similar to “CCIR 601” )
1999 May 31
White
Yellow
Cyan
Green
Magenta
Red
Blue
Black
Sample
Luminance pixel number
Colour pixel number
Digital video encoder
COLOUR
a) R = Y + 1.3707
b) G = Y
c) B = Y + 1.7324
0.3365
TIME
235
210
170
145
106
81
41
16
Y
(Cb
(Cr
(Cb
128)
128).
128)
0.6982
128
166
202
240
128
Cb
16
54
90
(Cr
Cb
128)
0
0
128
146
222
240
128
110
Cr
16
34
0
9
The RGB, respectively Cr-Y-Cb path features a gain
setting individually for luminance (GY) and colour
difference signals (GCD).
Reference levels are measured with a colour bar,
100% white, 100% amplitude and 100% saturation.
SIGNALS
Y
1
0
0
Cr
2
(1)
0
R
235
235
235
235
16
16
16
16
1
(2)
Y
3
SAA7126H; SAA7127H
1
BITS
Cb
4
2
G
235
235
235
235
16
16
16
16
2
(2)
Y
5
Product specification
2
2
Cr
6
2
B
235
235
235
235
16
16
16
16
3
(2)
Y
7
3