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4LS

Functional Description

Datasheet

• PUBLIC

DS000542

• v3-01 • 2022-Nov-17

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│ 40

According to the bit-mode and frequency, is recommended the below minimum timing values.

Figure 58:

Minimum Timing Periods

Timing ID

Description

12-bit @ 60 MHz

8-bit @ 80 MHz

RST_CVC

400 ns

500 ns

FE(1) RST_CVC & FE(1) RST_CDS

600 ns

750 ns

RST_CDS

1 µs

1.25 µs

SAMPLE

500 ns(2)

500 ns(3)

START_AD

2 x TMCLK

START_READOUT

20 x TMCLK(4)

12 x TMCLK(5)

8 x TMCLK(6)

G(7)

FE(1)RST_CDS & RE SAMPLE(2)

10.83 µs(8)

6.475 µs(9)

2287.5 µs(10)

H(7)

Integration Time (G + D)

11.33 µs(8)

6.975 µs(9)

2787.5 µs(10)

FE(1)SAMPLE & RE(11) START_AD

8 x TMCLK

12 x TMCLK

(1)

FE stands for Falling Edge.

(2)

Originally, the minimum SAMPLE pulse period is 1 µs. To achieve a higher line rate at 12-bit, the minimum pulse can be

500 µs, maintaining image quality.

(3)

When using full resolution, for 8-bit mode, the SAMPLE can be originally 1 µs, because the Readout time is much

higher than the ADC conversion time, therefore not affecting the line rate. However, when using the ROI feature for

4LS5K, to achieve a higher line rate, the minimum SAMPLE pulse can be decreased to 500 µs, maintaining the image

quality. Please check section 7.11 for details.

(4)

4LS15K

(5)

4LS10K

(6)

4LS5K

(7)

In theory, can be zero which means that the Minimum Integration/Exposure can be the same as SAMPLE time, as in D.

However, please note that this configuration was never tested. Moreover, when using the sensor with the maximum line

rate, does not bring much advantage to reduce this value, because the system would need more illumination power, to

illuminate the target, and the line rate is still limited by the ADC time. Please refer to section 7.11 to check the details of

the state machine implementation.

(8)

For 12-bit, the minimum integration time tested was 11.33 µs (680 clocks for 12-bit @ 60 MHz). Therefore, the minimum

G value is 10.83 µs.

(9)

For 8-bit, for full resolution, the minimum integration time tested was 6.975 µs (558 clocks @ 80 MHz). Therefore, the

minimum G value is 6.475 µs.

(10)

When using 4LS5K ROI feature, the minimum integration time tested was 2787.5 µs (223 clocks @ 80 MHz). Therefore,

the minimum G value is 2287.5 µs.

(11)

– Rising Edge

7.11.2

Readout Time

The readout time is calculated by the following formula, taking in consideration the values on

Figure 48.

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