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Specification-1910 Operators
Table 1-8
DIGITAL INPUT INTERFACE
Performance
Supplemental
Perf. Ck.
Characteristics
Requirements
Information
Step. No.
Digital Format
Parallel, 12 balanced signal pairs
consisting of 10 data bits per
sample, a clock, and a timing
reference signal.
Encoding Format
Positive binary
Sampling Frequency
I
4 times color subcarrier. Nominally
14.31818 MHz
Sampling Phase Angle
Referenced to I and
Q
axis.
I
,
Input logic Levels
High: -1.10 to -0.81 V
At 25°C.
Terminated in 100 g
Low: -1.85 to -1.48 V
10K ECl compatible.
Dynamic Range
!
10 bits/sample
Blanking level (0 IRE) is at digital word
240.
Reference white (100 IRE) is at digital
word 800 (5.6 LSB/IRE).
Setup Time
Data needs to be valid at least 10 ns
before the 50% point of the negative
transition of the clock pulse.
Hold Time
Data needs to be valid for at least
10 ns after the 50% point of the
negative transition of the clock pulse.
1-36
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