CS7620 데이터 시트보기 (PDF) - Cirrus Logic

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CS7620

CCD Imager Analog Processor

Cirrus Logic 

CS7620

register programmable in terms of multiples of the

pixel clock rate.

3.6 8-Bit General Purpose DACs

Two 8-bit current-output DACs are available for

external use. Table 4 shows the output specifica-

tions of these DACs.

3.7 Stand By Mode

Stand-by mode can be entered using the PWR_DN

pin. All circuitry on chip including the DACs can

Expose

Parameter

Iout

loading

High impedance

mode

2.155 mA

464 Ω

Low impedance

mode

8.7 mA

115 Ω

Table 4. General Purpose DAC specifications

be powered down. Various functional blocks can

be powered down individually, and are controlled

through registers. Note that the DACs can be pow-

ered down in that way if not in use. During Stand

By mode, the register contents are maintained and

vsync_md = 0 vsync_md = 1

RD_OUT

HSYNC

V1 ... V4

S1 ... S4

H1 ... H4

Expose

RD_OUT

262 lines

first read-out line

last read-out line

Figure 21. High Resolution Mode

don’t care

vsync_md = 0

vsync_md = 1

HSYNC

V1 ... V4

S1 ... S4

H1 ... H4

262 lines

262 lines

first read-out line

last read-out line first read-out line

picture n

picture n

picture (n+1)

Figure 22. Low Resolution Mode

20

DS301PP2

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