CS7615 datasheet(9/36 Pages) CIRRUS

9 / 36 page

CS7615

DS231PP6

Table 2 specifies all of the programmable timing

parameters related to horizontal timing signals.

These parameters are defined in Figure 9.

Figure 9 shows the timings for HREF, HSYNC,

CLAMP, and HENB. Their relationship to differ-

ent kinds of pixels on each horizontal row output

from the CCD is also shown. The waveforms for

these signals are repeated on every line. The hori-

zontal shift register clocks, H1 and H2, operate at

the CLKO frequency and are active throughout the

horizontal line period except when HENB is high.

Figure 10 shows the timings for the V1X through

V4X signals. The specified waveforms repeat on

every horizontal line except during the charge

transfer line. During this line the CCD charge is

read out and the timing is different as shown in Fig-

ure 11. In addition signals VH1X and VH3X are

also required during charge read out as shown in

Figure 12.

The overflow drain control signal is shown in Fig-

ure 13. The OFDX signal is used to control the

electronic shutter timing of the CCD. Shutter tim-

ing for various settings of the shutter control is de-

scribed in the register section of this document.

Description of Operation

The internal operation of the CS7615 can be sepa-

rated into several distinct blocks. The following

section provides an overview of how these blocks

operate and interact.

Automatic Gain Control

The pixel data entering the CS7615 from the CCD

is scaled as determined by the automatic gain con-

trol loop. By properly applying gain to the signal,

the full range of the A/D converter is used. The in-

VREF*

HREF

FLD

VLO

VLE

VBO: end of VREF

XSO: charge transfer line

XSE: charge transfer line

VBE: end of VREF

Not to scale

Figure 8. Vertical Timing Signals -Internal to CS7615

Symbol

Description

VLO

# of lines in odd field

33h, 39h

VLE

# of lines in even field

34h, 39h

VBO

End of VREF line #

36h, 39h

XSO

Charge transfer line #

38h, 39h

VBE

End of VREF line #

35h, 39h

XSE

Charge transfer line #

37h, 39h

Table 1. CCD vertical timing specifications

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