MAX9526 datasheet(23/38 Pages) MAXIM

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Low-Power, High-Performance

NTSC/PAL Video Decoder

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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

REG

0x00

VID1

VID2

CTHR

ADCOVR

HLOCK

NONSTD

LSTLCK

I2C Bit Descriptions

REG

0x01

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.

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