cx25870 Conexant Systems, Inc., cx25870 Datasheet - Page 170

• Manufacturer Part Number: cx25870
• Description: Video Encoder With Adaptive Flicker Filtering And Hdtv Output
• Manufacturer: Conexant Systems, Inc.

4.0 Parametric Information
4.2 AC Electrical Parameters
Table 4-4. AC Characteristics for CX25870/871 (3 of 3)
4-6
Lowsync width
Start of line to end of active video
Highsync width
Rising edge of sync to start of broad pulse
Start of line to start of active video
Sync rise time
Total line time
Active line time
Lowsync width
Start of line to end of active video
High sync width
Rising edge of sync to start of broad pulse
Rising edge of sync to start of active video
Sync rise time
Total line time
Active line time
NOTE(S):
1. Guaranteed by characterization; NTSC output, no vertical or horizontal scaling. Flicker Filter and other internal low-pass filters
(2)
(3)
(4)
(5)
(6)
(7)
(8)
bypassed, and contrast, brightness, saturation levels set to full scale.
100/7.5/100/7.5 Color bars normalized to burst.
Guaranteed by design.
Control pins are defined as: BLANK*, HSYNC*, VSYNC*, FIELD, CLKO, CLKI, RESET*, PAL, and SLAVE.
DAC output load < 75 pF. HSYNC*, VSYNC*, BLANK*, and FIELD output load < 75 pF. As the above parameters are
guaranteed over the full temperature range, temperature coefficients are not specified or required. Typical values are based on
nominal temperature, i.e., room temperature, and nominal voltage, i.e., 3.3 V.
There are numerous power-down options. This value was determined by setting SLEEP_EN, DIS_CLKI, DIS_CLKO, BY_PLL,
XTL_BFO_DIS, XTAL_PAD_DIS bits and pulling the SLEEP pin high.
This value was determined by setting BY_PLL, SLEEP_ED, DIS_CLKI, DIS_CLKO, XTAL_BFO_DIS bits.
To ensure that the encoder performance falls within DC and AC electrical limits, no more than one DAC should be disabled at
any time.
Parameter
Parameter
HDTV Output Timing Characteristics: 720p (see
HDTV Output Timing Characteristics: 1080i (see
Conexant
Flicker-Free Video Encoder with Ultrascale Technology
Symbol
Symbol
—
—
—
—
—
)
*
+
,
-
.
b
c
d
e
a
Min
Figure
Min
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Figure
4-10)
4-9)
598.8
28.385
598.8
1.796
2.588
54.5
29.685
25.778
548
20.54
548
3.53
3.53
54.7
22.2
17.16
Typical
Typical
Max
Max
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
CX25870/871
100381B
ns
!s
ns
!s
!s
ns
!s
!s
Units
Units
ns
!s
ns
!s
!s
ns
!s
!s