
Low-Power, High-Performance
NTSC/PAL Video Decoder
Video Input 1 Active (VID1)
1 = Active video detected at VIN1.
0 = No active video detected on VIN1.
Video Input 2 Active (VID2)
1 = Active video detected at VIN2.
0 = No active video detected on VIN2.
Below Color Kill Threshold (CTHR)
1 = Color carrier has fallen below color kill threshold
since last register 0 read.
0 = Color carrier has not fallen below color kill thresh-
old since last register 0 read.
CTHR reports when the chroma carrier is below color
kill threshold. See register 0x0B for color kill threshold
and color kill enable settings.
ADC Out-of-Range (ADCOVR)
1 = ADC has gone outside the full-scale range since
last register 0 read.
0 = ADC has not gone outside the full-scale range
since last register 0 read.
ADCOVR triggers when the ADC input is above or
below the ADC input range. This bit is cleared after
reading status register 0. ADCOVR is not triggered on
lines during the vertical blanking interval, on lines at the
start or end of the field that may have pulses from copy
protection, or on lines that may have ancillary data.
Horizontal Lock (HLOCK)
1 = Line-locked PLL is locked to horizontal line rate and
has not lost lock since last status register 0 read.
0 = Line-locked PLL has lost lock since last status reg-
ister 0 read.
Nonstandard Video (NONSTD)
1 = Nonstandard video detected.
0 = Standard video format detected.
For standard video, the carrier frequency is always a
precise multiple of the horizontal frequency. An exam-
ple of nonstandard inputs are video cassette recorders
in which the carrier is not a precise multiple of the hori-
zontal frequency.
Demodulator Lost Lock (LSTLCK)
1 = Demodulator has lost lock since last status register
0 read.
0 = Demodulator has maintained lock since last status
register 0 read.
REG
B7
B6
B5
B4
B3
B2
B1
B0
0x00
VID1
VID2
0
CTHR
ADCOVR
HLOCK
NONSTD
LSTLCK
I2C Bit Descriptions
REG
B7
B6
B5
B4
B3
B2
B1
B0
0x01
0
L525
00000
ACP
Status Register 1
Status Register 0
525 Line Mode (L525)
1 = 525 line video detected.
0 = 625 line video detected.
This output is only valid when the decoder is locked
and operating normally.
Analog Copy Protection (ACP)
1 = Analog copy protection detected.
0 = No analog copy protection detected.
MAX9526
Maxim Integrated
23