pixel value of the video pixel with exposure off. The references for these levels are the
dark level, VDL.
9. DARK OUTPUT VOLTAGE, VDL is the level between the out video pixel dark level and
the ground.
10. RANDOM NOISE, RNL, is measured using two methods, one is tangentially on the
scope. This measures an approximate peak-to-peak, p-p, random thermal noise. The
other is in terms of rms. It is estimated by using the Gaussian Statistical Methods. One
pixel is selected out of a line scan and its peak values are recorded for a multiple line
scans. These random peak values are used to estimate the rms values.
11. MODULATION TRANSFER FUNCTION depends on the optical system. Since this
system relies on the users optical system it was not measured. Refer back to note 5,
measurements on Up, all notes that references the optical measurements applies to
MTF measurements as well. Using a conservative engineering estimate, the sensor’s
MTF is in excess of 70% at the Optical Nyquest Frequency.
7.0 ELECTRICAL CLOCKING CHARACTERISTICS.
TABLE 7.1 CLOCK AMPLITUDE AND DUTY CHARACTERISTICS
(Ta =25OC)
SPECIFICATION
ITEM
SYMBOL CONDITION
UNITS
MIN
TYP
See note
(1) for
MAX
CLOCK
INPUT
VIH (1)
VIL (1)
For values
see the notes
VOLTAGE
CLOCK
INPUT
values
See note
(1) for
IIH (1)
IIL (1)
CURRENT
CLOCK
FREQUENCY
LINE READ
TIME
CLOCK
PULSE DUTY
CYCLE
values
5.0
FREQ (2)
TINT (3)
0.100
160
25
6.0
1000
75
MHz
192
50
µs
RATIO=
tw/ to (4)
%
Note 1. These clock, CP, and start pulse, SP, values are compatible with CMOS 74HCXX series
logic devices.
Note 2. FREQ is not only the clock frequency, but is also equal to the pixel sample rate. See not
2 under Table 6.1.
Note 3. TINT is the Line scan read time that depends on the interval between the start pulse
entries. See note 1 under Table 6.1. The longest integration time is determined by the
degree of leakage current degradation that can be tolerated by the system. A 10ms
maximum is a typical rule-of-thumb. An experienced CIS user can use his discretion and
determine the desired tolerance level for the given system.
Note 4. The definition for the symbols used in the RATIO is defined under the 7.2 Timing
Diagram.
7.2 TIMING DIAGRAM
PAGE 7 OF 22 - PI616MC-AS, 12/20/02
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